summaryrefslogtreecommitdiffstats
path: root/widget/windows/KeyboardLayout.cpp
blob: b4801fa19c3b5aaa904e0c9b220be9ada84bb8eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/Logging.h"

#include "mozilla/ArrayUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/TextEvents.h"
#include "mozilla/WindowsVersion.h"

#include "nsAlgorithm.h"
#include "nsGkAtoms.h"
#include "nsIDOMKeyEvent.h"
#include "nsIIdleServiceInternal.h"
#include "nsIWindowsRegKey.h"
#include "nsMemory.h"
#include "nsPrintfCString.h"
#include "nsQuickSort.h"
#include "nsServiceManagerUtils.h"
#include "nsToolkit.h"
#include "nsUnicharUtils.h"
#include "nsWindowDbg.h"

#include "KeyboardLayout.h"
#include "WidgetUtils.h"
#include "WinUtils.h"

#include "npapi.h"

#include <windows.h>
#include <winuser.h>
#include <algorithm>

#ifndef WINABLEAPI
#include <winable.h>
#endif

namespace mozilla {
namespace widget {

static const char* kVirtualKeyName[] = {
  "NULL", "VK_LBUTTON", "VK_RBUTTON", "VK_CANCEL",
  "VK_MBUTTON", "VK_XBUTTON1", "VK_XBUTTON2", "0x07",
  "VK_BACK", "VK_TAB", "0x0A", "0x0B",
  "VK_CLEAR", "VK_RETURN", "0x0E", "0x0F",

  "VK_SHIFT", "VK_CONTROL", "VK_MENU", "VK_PAUSE",
  "VK_CAPITAL", "VK_KANA, VK_HANGUL", "0x16", "VK_JUNJA",
  "VK_FINAL", "VK_HANJA, VK_KANJI", "0x1A", "VK_ESCAPE",
  "VK_CONVERT", "VK_NONCONVERT", "VK_ACCEPT", "VK_MODECHANGE",

  "VK_SPACE", "VK_PRIOR", "VK_NEXT", "VK_END",
  "VK_HOME", "VK_LEFT", "VK_UP", "VK_RIGHT",
  "VK_DOWN", "VK_SELECT", "VK_PRINT", "VK_EXECUTE",
  "VK_SNAPSHOT", "VK_INSERT", "VK_DELETE", "VK_HELP",

  "VK_0", "VK_1", "VK_2", "VK_3",
  "VK_4", "VK_5", "VK_6", "VK_7",
  "VK_8", "VK_9", "0x3A", "0x3B",
  "0x3C", "0x3D", "0x3E", "0x3F",

  "0x40", "VK_A", "VK_B", "VK_C",
  "VK_D", "VK_E", "VK_F", "VK_G",
  "VK_H", "VK_I", "VK_J", "VK_K",
  "VK_L", "VK_M", "VK_N", "VK_O",

  "VK_P", "VK_Q", "VK_R", "VK_S",
  "VK_T", "VK_U", "VK_V", "VK_W",
  "VK_X", "VK_Y", "VK_Z", "VK_LWIN",
  "VK_RWIN", "VK_APPS", "0x5E", "VK_SLEEP",

  "VK_NUMPAD0", "VK_NUMPAD1", "VK_NUMPAD2", "VK_NUMPAD3",
  "VK_NUMPAD4", "VK_NUMPAD5", "VK_NUMPAD6", "VK_NUMPAD7",
  "VK_NUMPAD8", "VK_NUMPAD9", "VK_MULTIPLY", "VK_ADD",
  "VK_SEPARATOR", "VK_SUBTRACT", "VK_DECIMAL", "VK_DIVIDE",

  "VK_F1", "VK_F2", "VK_F3", "VK_F4",
  "VK_F5", "VK_F6", "VK_F7", "VK_F8",
  "VK_F9", "VK_F10", "VK_F11", "VK_F12",
  "VK_F13", "VK_F14", "VK_F15", "VK_F16",

  "VK_F17", "VK_F18", "VK_F19", "VK_F20",
  "VK_F21", "VK_F22", "VK_F23", "VK_F24",
  "0x88", "0x89", "0x8A", "0x8B",
  "0x8C", "0x8D", "0x8E", "0x8F",

  "VK_NUMLOCK", "VK_SCROLL", "VK_OEM_NEC_EQUAL, VK_OEM_FJ_JISHO",
    "VK_OEM_FJ_MASSHOU",
  "VK_OEM_FJ_TOUROKU", "VK_OEM_FJ_LOYA", "VK_OEM_FJ_ROYA", "0x97",
  "0x98", "0x99", "0x9A", "0x9B",
  "0x9C", "0x9D", "0x9E", "0x9F",

  "VK_LSHIFT", "VK_RSHIFT", "VK_LCONTROL", "VK_RCONTROL",
  "VK_LMENU", "VK_RMENU", "VK_BROWSER_BACK", "VK_BROWSER_FORWARD",
  "VK_BROWSER_REFRESH", "VK_BROWSER_STOP", "VK_BROWSER_SEARCH",
    "VK_BROWSER_FAVORITES",
  "VK_BROWSER_HOME", "VK_VOLUME_MUTE", "VK_VOLUME_DOWN", "VK_VOLUME_UP",

  "VK_MEDIA_NEXT_TRACK", "VK_MEDIA_PREV_TRACK", "VK_MEDIA_STOP",
    "VK_MEDIA_PLAY_PAUSE",
  "VK_LAUNCH_MAIL", "VK_LAUNCH_MEDIA_SELECT", "VK_LAUNCH_APP1",
    "VK_LAUNCH_APP2",
  "0xB8", "0xB9", "VK_OEM_1", "VK_OEM_PLUS",
  "VK_OEM_COMMA", "VK_OEM_MINUS", "VK_OEM_PERIOD", "VK_OEM_2",

  "VK_OEM_3", "VK_ABNT_C1", "VK_ABNT_C2", "0xC3",
  "0xC4", "0xC5", "0xC6", "0xC7",
  "0xC8", "0xC9", "0xCA", "0xCB",
  "0xCC", "0xCD", "0xCE", "0xCF",

  "0xD0", "0xD1", "0xD2", "0xD3",
  "0xD4", "0xD5", "0xD6", "0xD7",
  "0xD8", "0xD9", "0xDA", "VK_OEM_4",
  "VK_OEM_5", "VK_OEM_6", "VK_OEM_7", "VK_OEM_8",

  "0xE0", "VK_OEM_AX", "VK_OEM_102", "VK_ICO_HELP",
  "VK_ICO_00", "VK_PROCESSKEY", "VK_ICO_CLEAR", "VK_PACKET",
  "0xE8", "VK_OEM_RESET", "VK_OEM_JUMP", "VK_OEM_PA1",
  "VK_OEM_PA2", "VK_OEM_PA3", "VK_OEM_WSCTRL", "VK_OEM_CUSEL",

  "VK_OEM_ATTN", "VK_OEM_FINISH", "VK_OEM_COPY", "VK_OEM_AUTO",
  "VK_OEM_ENLW", "VK_OEM_BACKTAB", "VK_ATTN", "VK_CRSEL",
  "VK_EXSEL", "VK_EREOF", "VK_PLAY", "VK_ZOOM",
  "VK_NONAME", "VK_PA1", "VK_OEM_CLEAR", "0xFF"
};

static_assert(sizeof(kVirtualKeyName) / sizeof(const char*) == 0x100,
  "The virtual key name must be defined just 256 keys");

static const char*
GetBoolName(bool aBool)
{
  return aBool ? "true" : "false";
}

static const nsCString
GetCharacterCodeName(WPARAM aCharCode)
{
  switch (aCharCode) {
    case 0x0000:
      return NS_LITERAL_CSTRING("NULL (0x0000)");
    case 0x0008:
      return NS_LITERAL_CSTRING("BACKSPACE (0x0008)");
    case 0x0009:
      return NS_LITERAL_CSTRING("CHARACTER TABULATION (0x0009)");
    case 0x000A:
      return NS_LITERAL_CSTRING("LINE FEED (0x000A)");
    case 0x000B:
      return NS_LITERAL_CSTRING("LINE TABULATION (0x000B)");
    case 0x000C:
      return NS_LITERAL_CSTRING("FORM FEED (0x000C)");
    case 0x000D:
      return NS_LITERAL_CSTRING("CARRIAGE RETURN (0x000D)");
    case 0x0018:
      return NS_LITERAL_CSTRING("CANCEL (0x0018)");
    case 0x001B:
      return NS_LITERAL_CSTRING("ESCAPE (0x001B)");
    case 0x0020:
      return NS_LITERAL_CSTRING("SPACE (0x0020)");
    case 0x007F:
      return NS_LITERAL_CSTRING("DELETE (0x007F)");
    case 0x00A0:
      return NS_LITERAL_CSTRING("NO-BREAK SPACE (0x00A0)");
    case 0x00AD:
      return NS_LITERAL_CSTRING("SOFT HYPHEN (0x00AD)");
    case 0x2000:
      return NS_LITERAL_CSTRING("EN QUAD (0x2000)");
    case 0x2001:
      return NS_LITERAL_CSTRING("EM QUAD (0x2001)");
    case 0x2002:
      return NS_LITERAL_CSTRING("EN SPACE (0x2002)");
    case 0x2003:
      return NS_LITERAL_CSTRING("EM SPACE (0x2003)");
    case 0x2004:
      return NS_LITERAL_CSTRING("THREE-PER-EM SPACE (0x2004)");
    case 0x2005:
      return NS_LITERAL_CSTRING("FOUR-PER-EM SPACE (0x2005)");
    case 0x2006:
      return NS_LITERAL_CSTRING("SIX-PER-EM SPACE (0x2006)");
    case 0x2007:
      return NS_LITERAL_CSTRING("FIGURE SPACE (0x2007)");
    case 0x2008:
      return NS_LITERAL_CSTRING("PUNCTUATION SPACE (0x2008)");
    case 0x2009:
      return NS_LITERAL_CSTRING("THIN SPACE (0x2009)");
    case 0x200A:
      return NS_LITERAL_CSTRING("HAIR SPACE (0x200A)");
    case 0x200B:
      return NS_LITERAL_CSTRING("ZERO WIDTH SPACE (0x200B)");
    case 0x200C:
      return NS_LITERAL_CSTRING("ZERO WIDTH NON-JOINER (0x200C)");
    case 0x200D:
      return NS_LITERAL_CSTRING("ZERO WIDTH JOINER (0x200D)");
    case 0x200E:
      return NS_LITERAL_CSTRING("LEFT-TO-RIGHT MARK (0x200E)");
    case 0x200F:
      return NS_LITERAL_CSTRING("RIGHT-TO-LEFT MARK (0x200F)");
    case 0x2029:
      return NS_LITERAL_CSTRING("PARAGRAPH SEPARATOR (0x2029)");
    case 0x202A:
      return NS_LITERAL_CSTRING("LEFT-TO-RIGHT EMBEDDING (0x202A)");
    case 0x202B:
      return NS_LITERAL_CSTRING("RIGHT-TO-LEFT EMBEDDING (0x202B)");
    case 0x202D:
      return NS_LITERAL_CSTRING("LEFT-TO-RIGHT OVERRIDE (0x202D)");
    case 0x202E:
      return NS_LITERAL_CSTRING("RIGHT-TO-LEFT OVERRIDE (0x202E)");
    case 0x202F:
      return NS_LITERAL_CSTRING("NARROW NO-BREAK SPACE (0x202F)");
    case 0x205F:
      return NS_LITERAL_CSTRING("MEDIUM MATHEMATICAL SPACE (0x205F)");
    case 0x2060:
      return NS_LITERAL_CSTRING("WORD JOINER (0x2060)");
    case 0x2066:
      return NS_LITERAL_CSTRING("LEFT-TO-RIGHT ISOLATE (0x2066)");
    case 0x2067:
      return NS_LITERAL_CSTRING("RIGHT-TO-LEFT ISOLATE (0x2067)");
    case 0x3000:
      return NS_LITERAL_CSTRING("IDEOGRAPHIC SPACE (0x3000)");
    case 0xFEFF:
      return NS_LITERAL_CSTRING("ZERO WIDTH NO-BREAK SPACE (0xFEFF)");
    default: {
      if (aCharCode < ' ' ||
          (aCharCode >= 0x80 && aCharCode < 0xA0)) {
        return nsPrintfCString("control (0x%04X)", aCharCode);
      }
      if (NS_IS_HIGH_SURROGATE(aCharCode)) {
        return nsPrintfCString("high surrogate (0x%04X)", aCharCode);
      }
      if (NS_IS_LOW_SURROGATE(aCharCode)) {
        return nsPrintfCString("low surrogate (0x%04X)", aCharCode);
      }
      return IS_IN_BMP(aCharCode) ?
        nsPrintfCString("'%s' (0x%04X)",
          NS_ConvertUTF16toUTF8(nsAutoString(aCharCode)).get(), aCharCode) :
        nsPrintfCString("'%s' (0x%08X)",
          NS_ConvertUTF16toUTF8(nsAutoString(aCharCode)).get(), aCharCode);
    }
  }
}

static const nsCString
GetKeyLocationName(uint32_t aLocation)
{
  switch (aLocation) {
    case nsIDOMKeyEvent::DOM_KEY_LOCATION_LEFT:
      return NS_LITERAL_CSTRING("KEY_LOCATION_LEFT");
    case nsIDOMKeyEvent::DOM_KEY_LOCATION_RIGHT:
      return NS_LITERAL_CSTRING("KEY_LOCATION_RIGHT");
    case nsIDOMKeyEvent::DOM_KEY_LOCATION_STANDARD:
      return NS_LITERAL_CSTRING("KEY_LOCATION_STANDARD");
    case nsIDOMKeyEvent::DOM_KEY_LOCATION_NUMPAD:
      return NS_LITERAL_CSTRING("KEY_LOCATION_NUMPAD");
    default:
      return nsPrintfCString("Unknown (0x%04X)", aLocation);
  }
}

static const nsCString
GetCharacterCodeName(char16_t* aChars, uint32_t aLength)
{
  if (!aLength) {
    return NS_LITERAL_CSTRING("");
  }
  nsAutoCString result;
  for (uint32_t i = 0; i < aLength; ++i) {
    if (!result.IsEmpty()) {
      result.AppendLiteral(", ");
    } else {
      result.AssignLiteral("\"");
    }
    result.Append(GetCharacterCodeName(aChars[i]));
  }
  result.AppendLiteral("\"");
  return result;
}

class MOZ_STACK_CLASS GetShiftStateName final : public nsAutoCString
{
public:
  explicit GetShiftStateName(VirtualKey::ShiftState aShiftState)
  {
    if (!aShiftState) {
      AssignLiteral("none");
      return;
    }
    if (aShiftState & VirtualKey::STATE_SHIFT) {
      AssignLiteral("Shift");
      aShiftState &= ~VirtualKey::STATE_SHIFT;
    }
    if (aShiftState & VirtualKey::STATE_CONTROL) {
      MaybeAppendSeparator();
      AssignLiteral("Ctrl");
      aShiftState &= ~VirtualKey::STATE_CONTROL;
    }
    if (aShiftState & VirtualKey::STATE_ALT) {
      MaybeAppendSeparator();
      AssignLiteral("Alt");
      aShiftState &= ~VirtualKey::STATE_ALT;
    }
    if (aShiftState & VirtualKey::STATE_CAPSLOCK) {
      MaybeAppendSeparator();
      AssignLiteral("CapsLock");
      aShiftState &= ~VirtualKey::STATE_CAPSLOCK;
    }
    MOZ_ASSERT(!aShiftState);
  }

private:
  void MaybeAppendSeparator()
  {
    if (!IsEmpty()) {
      AppendLiteral(" | ");
    }
  }
};

static const nsCString
GetMessageName(UINT aMessage)
{
  switch (aMessage) {
    case WM_NULL:
      return NS_LITERAL_CSTRING("WM_NULL");
    case WM_KEYDOWN:
      return NS_LITERAL_CSTRING("WM_KEYDOWN");
    case WM_KEYUP:
      return NS_LITERAL_CSTRING("WM_KEYUP");
    case WM_SYSKEYDOWN:
      return NS_LITERAL_CSTRING("WM_SYSKEYDOWN");
    case WM_SYSKEYUP:
      return NS_LITERAL_CSTRING("WM_SYSKEYUP");
    case WM_CHAR:
      return NS_LITERAL_CSTRING("WM_CHAR");
    case WM_UNICHAR:
      return NS_LITERAL_CSTRING("WM_UNICHAR");
    case WM_SYSCHAR:
      return NS_LITERAL_CSTRING("WM_SYSCHAR");
    case WM_DEADCHAR:
      return NS_LITERAL_CSTRING("WM_DEADCHAR");
    case WM_SYSDEADCHAR:
      return NS_LITERAL_CSTRING("WM_SYSDEADCHAR");
    case MOZ_WM_KEYDOWN:
      return NS_LITERAL_CSTRING("MOZ_WM_KEYDOWN");
    case MOZ_WM_KEYUP:
      return NS_LITERAL_CSTRING("MOZ_WM_KEYUP");
    case WM_APPCOMMAND:
      return NS_LITERAL_CSTRING("WM_APPCOMMAND");
    case WM_QUIT:
      return NS_LITERAL_CSTRING("WM_QUIT");
    default:
      return nsPrintfCString("Unknown Message (0x%04X)", aMessage);
  }
}

static const nsCString
GetVirtualKeyCodeName(WPARAM aVK)
{
  if (aVK >= ArrayLength(kVirtualKeyName)) {
    return nsPrintfCString("Invalid (0x%08X)", aVK);
  }
  return nsCString(kVirtualKeyName[aVK]);
}

static const nsCString
GetAppCommandName(WPARAM aCommand)
{
  switch (aCommand) {
    case APPCOMMAND_BASS_BOOST:
      return NS_LITERAL_CSTRING("APPCOMMAND_BASS_BOOST");
    case APPCOMMAND_BASS_DOWN:
      return NS_LITERAL_CSTRING("APPCOMMAND_BASS_DOWN");
    case APPCOMMAND_BASS_UP:
      return NS_LITERAL_CSTRING("APPCOMMAND_BASS_UP");
    case APPCOMMAND_BROWSER_BACKWARD:
      return NS_LITERAL_CSTRING("APPCOMMAND_BROWSER_BACKWARD");
    case APPCOMMAND_BROWSER_FAVORITES:
      return NS_LITERAL_CSTRING("APPCOMMAND_BROWSER_FAVORITES");
    case APPCOMMAND_BROWSER_FORWARD:
      return NS_LITERAL_CSTRING("APPCOMMAND_BROWSER_FORWARD");
    case APPCOMMAND_BROWSER_HOME:
      return NS_LITERAL_CSTRING("APPCOMMAND_BROWSER_HOME");
    case APPCOMMAND_BROWSER_REFRESH:
      return NS_LITERAL_CSTRING("APPCOMMAND_BROWSER_REFRESH");
    case APPCOMMAND_BROWSER_SEARCH:
      return NS_LITERAL_CSTRING("APPCOMMAND_BROWSER_SEARCH");
    case APPCOMMAND_BROWSER_STOP:
      return NS_LITERAL_CSTRING("APPCOMMAND_BROWSER_STOP");
    case APPCOMMAND_CLOSE:
      return NS_LITERAL_CSTRING("APPCOMMAND_CLOSE");
    case APPCOMMAND_COPY:
      return NS_LITERAL_CSTRING("APPCOMMAND_COPY");
    case APPCOMMAND_CORRECTION_LIST:
      return NS_LITERAL_CSTRING("APPCOMMAND_CORRECTION_LIST");
    case APPCOMMAND_CUT:
      return NS_LITERAL_CSTRING("APPCOMMAND_CUT");
    case APPCOMMAND_DICTATE_OR_COMMAND_CONTROL_TOGGLE:
      return NS_LITERAL_CSTRING("APPCOMMAND_DICTATE_OR_COMMAND_CONTROL_TOGGLE");
    case APPCOMMAND_FIND:
      return NS_LITERAL_CSTRING("APPCOMMAND_FIND");
    case APPCOMMAND_FORWARD_MAIL:
      return NS_LITERAL_CSTRING("APPCOMMAND_FORWARD_MAIL");
    case APPCOMMAND_HELP:
      return NS_LITERAL_CSTRING("APPCOMMAND_HELP");
    case APPCOMMAND_LAUNCH_APP1:
      return NS_LITERAL_CSTRING("APPCOMMAND_LAUNCH_APP1");
    case APPCOMMAND_LAUNCH_APP2:
      return NS_LITERAL_CSTRING("APPCOMMAND_LAUNCH_APP2");
    case APPCOMMAND_LAUNCH_MAIL:
      return NS_LITERAL_CSTRING("APPCOMMAND_LAUNCH_MAIL");
    case APPCOMMAND_LAUNCH_MEDIA_SELECT:
      return NS_LITERAL_CSTRING("APPCOMMAND_LAUNCH_MEDIA_SELECT");
    case APPCOMMAND_MEDIA_CHANNEL_DOWN:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_CHANNEL_DOWN");
    case APPCOMMAND_MEDIA_CHANNEL_UP:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_CHANNEL_UP");
    case APPCOMMAND_MEDIA_FAST_FORWARD:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_FAST_FORWARD");
    case APPCOMMAND_MEDIA_NEXTTRACK:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_NEXTTRACK");
    case APPCOMMAND_MEDIA_PAUSE:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_PAUSE");
    case APPCOMMAND_MEDIA_PLAY:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_PLAY");
    case APPCOMMAND_MEDIA_PLAY_PAUSE:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_PLAY_PAUSE");
    case APPCOMMAND_MEDIA_PREVIOUSTRACK:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_PREVIOUSTRACK");
    case APPCOMMAND_MEDIA_RECORD:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_RECORD");
    case APPCOMMAND_MEDIA_REWIND:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_REWIND");
    case APPCOMMAND_MEDIA_STOP:
      return NS_LITERAL_CSTRING("APPCOMMAND_MEDIA_STOP");
    case APPCOMMAND_MIC_ON_OFF_TOGGLE:
      return NS_LITERAL_CSTRING("APPCOMMAND_MIC_ON_OFF_TOGGLE");
    case APPCOMMAND_MICROPHONE_VOLUME_DOWN:
      return NS_LITERAL_CSTRING("APPCOMMAND_MICROPHONE_VOLUME_DOWN");
    case APPCOMMAND_MICROPHONE_VOLUME_MUTE:
      return NS_LITERAL_CSTRING("APPCOMMAND_MICROPHONE_VOLUME_MUTE");
    case APPCOMMAND_MICROPHONE_VOLUME_UP:
      return NS_LITERAL_CSTRING("APPCOMMAND_MICROPHONE_VOLUME_UP");
    case APPCOMMAND_NEW:
      return NS_LITERAL_CSTRING("APPCOMMAND_NEW");
    case APPCOMMAND_OPEN:
      return NS_LITERAL_CSTRING("APPCOMMAND_OPEN");
    case APPCOMMAND_PASTE:
      return NS_LITERAL_CSTRING("APPCOMMAND_PASTE");
    case APPCOMMAND_PRINT:
      return NS_LITERAL_CSTRING("APPCOMMAND_PRINT");
    case APPCOMMAND_REDO:
      return NS_LITERAL_CSTRING("APPCOMMAND_REDO");
    case APPCOMMAND_REPLY_TO_MAIL:
      return NS_LITERAL_CSTRING("APPCOMMAND_REPLY_TO_MAIL");
    case APPCOMMAND_SAVE:
      return NS_LITERAL_CSTRING("APPCOMMAND_SAVE");
    case APPCOMMAND_SEND_MAIL:
      return NS_LITERAL_CSTRING("APPCOMMAND_SEND_MAIL");
    case APPCOMMAND_SPELL_CHECK:
      return NS_LITERAL_CSTRING("APPCOMMAND_SPELL_CHECK");
    case APPCOMMAND_TREBLE_DOWN:
      return NS_LITERAL_CSTRING("APPCOMMAND_TREBLE_DOWN");
    case APPCOMMAND_TREBLE_UP:
      return NS_LITERAL_CSTRING("APPCOMMAND_TREBLE_UP");
    case APPCOMMAND_UNDO:
      return NS_LITERAL_CSTRING("APPCOMMAND_UNDO");
    case APPCOMMAND_VOLUME_DOWN:
      return NS_LITERAL_CSTRING("APPCOMMAND_VOLUME_DOWN");
    case APPCOMMAND_VOLUME_MUTE:
      return NS_LITERAL_CSTRING("APPCOMMAND_VOLUME_MUTE");
    case APPCOMMAND_VOLUME_UP:
      return NS_LITERAL_CSTRING("APPCOMMAND_VOLUME_UP");
    default:
      return nsPrintfCString("Unknown app command (0x%08X)", aCommand);
  }
}

static const nsCString
GetAppCommandDeviceName(LPARAM aDevice)
{
  switch (aDevice) {
    case FAPPCOMMAND_KEY:
      return NS_LITERAL_CSTRING("FAPPCOMMAND_KEY");
    case FAPPCOMMAND_MOUSE:
      return NS_LITERAL_CSTRING("FAPPCOMMAND_MOUSE");
    case FAPPCOMMAND_OEM:
      return NS_LITERAL_CSTRING("FAPPCOMMAND_OEM");
    default:
      return nsPrintfCString("Unknown app command device (0x%04X)", aDevice);
  }
};

class MOZ_STACK_CLASS GetAppCommandKeysName final : public nsAutoCString
{
public:
  GetAppCommandKeysName(WPARAM aKeys)
  {
    if (aKeys & MK_CONTROL) {
      AppendLiteral("MK_CONTROL");
      aKeys &= ~MK_CONTROL;
    }
    if (aKeys & MK_LBUTTON) {
      MaybeAppendSeparator();
      AppendLiteral("MK_LBUTTON");
      aKeys &= ~MK_LBUTTON;
    }
    if (aKeys & MK_MBUTTON) {
      MaybeAppendSeparator();
      AppendLiteral("MK_MBUTTON");
      aKeys &= ~MK_MBUTTON;
    }
    if (aKeys & MK_RBUTTON) {
      MaybeAppendSeparator();
      AppendLiteral("MK_RBUTTON");
      aKeys &= ~MK_RBUTTON;
    }
    if (aKeys & MK_SHIFT) {
      MaybeAppendSeparator();
      AppendLiteral("MK_SHIFT");
      aKeys &= ~MK_SHIFT;
    }
    if (aKeys & MK_XBUTTON1) {
      MaybeAppendSeparator();
      AppendLiteral("MK_XBUTTON1");
      aKeys &= ~MK_XBUTTON1;
    }
    if (aKeys & MK_XBUTTON2) {
      MaybeAppendSeparator();
      AppendLiteral("MK_XBUTTON2");
      aKeys &= ~MK_XBUTTON2;
    }
    if (aKeys) {
      MaybeAppendSeparator();
      AppendPrintf("Unknown Flags (0x%04X)", aKeys);
    }
    if (IsEmpty()) {
      AssignLiteral("none (0x0000)");
    }
  }

private:
  void MaybeAppendSeparator()
  {
    if (!IsEmpty()) {
      AppendLiteral(" | ");
    }
  }
};

static const nsCString
ToString(const MSG& aMSG)
{
  nsAutoCString result;
  result.AssignLiteral("{ message=");
  result.Append(GetMessageName(aMSG.message).get());
  result.AppendLiteral(", ");
  switch (aMSG.message) {
    case WM_KEYDOWN:
    case WM_KEYUP:
    case WM_SYSKEYDOWN:
    case WM_SYSKEYUP:
    case MOZ_WM_KEYDOWN:
    case MOZ_WM_KEYUP:
      result.AppendPrintf(
               "virtual keycode=%s, repeat count=%d, "
               "scancode=0x%02X, extended key=%s, "
               "context code=%s, previous key state=%s, "
               "transition state=%s",
               GetVirtualKeyCodeName(aMSG.wParam).get(),
               aMSG.lParam & 0xFFFF,
               WinUtils::GetScanCode(aMSG.lParam),
               GetBoolName(WinUtils::IsExtendedScanCode(aMSG.lParam)),
               GetBoolName((aMSG.lParam & (1 << 29)) != 0),
               GetBoolName((aMSG.lParam & (1 << 30)) != 0),
               GetBoolName((aMSG.lParam & (1 << 31)) != 0));
      break;
    case WM_CHAR:
    case WM_DEADCHAR:
    case WM_SYSCHAR:
    case WM_SYSDEADCHAR:
      result.AppendPrintf(
               "character code=%s, repeat count=%d, "
               "scancode=0x%02X, extended key=%s, "
               "context code=%s, previous key state=%s, "
               "transition state=%s",
               GetCharacterCodeName(aMSG.wParam).get(),
               aMSG.lParam & 0xFFFF,
               WinUtils::GetScanCode(aMSG.lParam),
               GetBoolName(WinUtils::IsExtendedScanCode(aMSG.lParam)),
               GetBoolName((aMSG.lParam & (1 << 29)) != 0),
               GetBoolName((aMSG.lParam & (1 << 30)) != 0),
               GetBoolName((aMSG.lParam & (1 << 31)) != 0));
      break;
    case WM_APPCOMMAND:
      result.AppendPrintf(
               "window handle=0x%p, app command=%s, device=%s, dwKeys=%s",
               aMSG.wParam,
               GetAppCommandName(GET_APPCOMMAND_LPARAM(aMSG.lParam)).get(),
               GetAppCommandDeviceName(GET_DEVICE_LPARAM(aMSG.lParam)).get(),
               GetAppCommandKeysName(GET_KEYSTATE_LPARAM(aMSG.lParam)).get());
      break;
    default:
      result.AppendPrintf("wParam=%u, lParam=%u", aMSG.wParam, aMSG.lParam);
      break;
  }
  result.AppendPrintf(", hwnd=0x%p", aMSG.hwnd);
  return result;
}

static const nsCString
ToString(const UniCharsAndModifiers& aUniCharsAndModifiers)
{
  if (aUniCharsAndModifiers.IsEmpty()) {
    return NS_LITERAL_CSTRING("{}");
  }
  nsAutoCString result;
  result.AssignLiteral("{ ");
  result.Append(GetCharacterCodeName(aUniCharsAndModifiers.CharAt(0)));
  for (size_t i = 1; i < aUniCharsAndModifiers.Length(); ++i) {
    if (aUniCharsAndModifiers.ModifiersAt(i - 1) !=
          aUniCharsAndModifiers.ModifiersAt(i)) {
      result.AppendLiteral(" [");
      result.Append(GetModifiersName(aUniCharsAndModifiers.ModifiersAt(0)));
      result.AppendLiteral("]");
    }
    result.AppendLiteral(", ");
    result.Append(GetCharacterCodeName(aUniCharsAndModifiers.CharAt(i)));
  }
  result.AppendLiteral(" [");
  uint32_t lastIndex = aUniCharsAndModifiers.Length() - 1;
  result.Append(GetModifiersName(aUniCharsAndModifiers.ModifiersAt(lastIndex)));
  result.AppendLiteral("] }");
  return result;
}

const nsCString
ToString(const ModifierKeyState& aModifierKeyState)
{
  nsAutoCString result;
  result.AssignLiteral("{ ");
  result.Append(GetModifiersName(aModifierKeyState.GetModifiers()).get());
  result.AppendLiteral(" }");
  return result;
}

// Unique id counter associated with a keydown / keypress events. Used in
// identifing keypress events for removal from async event dispatch queue
// in metrofx after preventDefault is called on keydown events.
static uint32_t sUniqueKeyEventId = 0;

struct DeadKeyEntry
{
  char16_t BaseChar;
  char16_t CompositeChar;
};


class DeadKeyTable
{
  friend class KeyboardLayout;

  uint16_t mEntries;
  // KeyboardLayout::AddDeadKeyTable() will allocate as many entries as
  // required.  It is the only way to create new DeadKeyTable instances.
  DeadKeyEntry mTable[1];

  void Init(const DeadKeyEntry* aDeadKeyArray, uint32_t aEntries)
  {
    mEntries = aEntries;
    memcpy(mTable, aDeadKeyArray, aEntries * sizeof(DeadKeyEntry));
  }

  static uint32_t SizeInBytes(uint32_t aEntries)
  {
    return offsetof(DeadKeyTable, mTable) + aEntries * sizeof(DeadKeyEntry);
  }

public:
  uint32_t Entries() const
  {
    return mEntries;
  }

  bool IsEqual(const DeadKeyEntry* aDeadKeyArray, uint32_t aEntries) const
  {
    return (mEntries == aEntries &&
            !memcmp(mTable, aDeadKeyArray,
                    aEntries * sizeof(DeadKeyEntry)));
  }

  char16_t GetCompositeChar(char16_t aBaseChar) const;
};


/*****************************************************************************
 * mozilla::widget::ModifierKeyState
 *****************************************************************************/

ModifierKeyState::ModifierKeyState()
{
  Update();
}

ModifierKeyState::ModifierKeyState(bool aIsShiftDown,
                                   bool aIsControlDown,
                                   bool aIsAltDown)
{
  Update();
  Unset(MODIFIER_SHIFT | MODIFIER_CONTROL | MODIFIER_ALT | MODIFIER_ALTGRAPH);
  Modifiers modifiers = 0;
  if (aIsShiftDown) {
    modifiers |= MODIFIER_SHIFT;
  }
  if (aIsControlDown) {
    modifiers |= MODIFIER_CONTROL;
  }
  if (aIsAltDown) {
    modifiers |= MODIFIER_ALT;
  }
  if (modifiers) {
    Set(modifiers);
  }
}

ModifierKeyState::ModifierKeyState(Modifiers aModifiers) :
  mModifiers(aModifiers)
{
  EnsureAltGr();
}

void
ModifierKeyState::Update()
{
  mModifiers = 0;
  if (IS_VK_DOWN(VK_SHIFT)) {
    mModifiers |= MODIFIER_SHIFT;
  }
  if (IS_VK_DOWN(VK_CONTROL)) {
    mModifiers |= MODIFIER_CONTROL;
  }
  if (IS_VK_DOWN(VK_MENU)) {
    mModifiers |= MODIFIER_ALT;
  }
  if (IS_VK_DOWN(VK_LWIN) || IS_VK_DOWN(VK_RWIN)) {
    mModifiers |= MODIFIER_OS;
  }
  if (::GetKeyState(VK_CAPITAL) & 1) {
    mModifiers |= MODIFIER_CAPSLOCK;
  }
  if (::GetKeyState(VK_NUMLOCK) & 1) {
    mModifiers |= MODIFIER_NUMLOCK;
  }
  if (::GetKeyState(VK_SCROLL) & 1) {
    mModifiers |= MODIFIER_SCROLLLOCK;
  }

  EnsureAltGr();
}

void
ModifierKeyState::Unset(Modifiers aRemovingModifiers)
{
  mModifiers &= ~aRemovingModifiers;
  // Note that we don't need to unset AltGr flag here automatically.
  // For EditorBase, we need to remove Alt and Control flags but AltGr isn't
  // checked in EditorBase, so, it can be kept.
}

void
ModifierKeyState::Set(Modifiers aAddingModifiers)
{
  mModifiers |= aAddingModifiers;
  EnsureAltGr();
}

void
ModifierKeyState::InitInputEvent(WidgetInputEvent& aInputEvent) const
{
  aInputEvent.mModifiers = mModifiers;

  switch(aInputEvent.mClass) {
    case eMouseEventClass:
    case eMouseScrollEventClass:
    case eWheelEventClass:
    case eDragEventClass:
    case eSimpleGestureEventClass:
      InitMouseEvent(aInputEvent);
      break;
    default:
      break;
  }
}

void
ModifierKeyState::InitMouseEvent(WidgetInputEvent& aMouseEvent) const
{
  NS_ASSERTION(aMouseEvent.mClass == eMouseEventClass ||
               aMouseEvent.mClass == eWheelEventClass ||
               aMouseEvent.mClass == eDragEventClass ||
               aMouseEvent.mClass == eSimpleGestureEventClass,
               "called with non-mouse event");

  WidgetMouseEventBase& mouseEvent = *aMouseEvent.AsMouseEventBase();
  mouseEvent.buttons = 0;
  if (::GetKeyState(VK_LBUTTON) < 0) {
    mouseEvent.buttons |= WidgetMouseEvent::eLeftButtonFlag;
  }
  if (::GetKeyState(VK_RBUTTON) < 0) {
    mouseEvent.buttons |= WidgetMouseEvent::eRightButtonFlag;
  }
  if (::GetKeyState(VK_MBUTTON) < 0) {
    mouseEvent.buttons |= WidgetMouseEvent::eMiddleButtonFlag;
  }
  if (::GetKeyState(VK_XBUTTON1) < 0) {
    mouseEvent.buttons |= WidgetMouseEvent::e4thButtonFlag;
  }
  if (::GetKeyState(VK_XBUTTON2) < 0) {
    mouseEvent.buttons |= WidgetMouseEvent::e5thButtonFlag;
  }
}

bool
ModifierKeyState::IsShift() const
{
  return (mModifiers & MODIFIER_SHIFT) != 0;
}

bool
ModifierKeyState::IsControl() const
{
  return (mModifiers & MODIFIER_CONTROL) != 0;
}

bool
ModifierKeyState::IsAlt() const
{
  return (mModifiers & MODIFIER_ALT) != 0;
}

bool
ModifierKeyState::IsAltGr() const
{
  return IsControl() && IsAlt();
}

bool
ModifierKeyState::IsWin() const
{
  return (mModifiers & MODIFIER_OS) != 0;
}

bool
ModifierKeyState::MaybeMatchShortcutKey() const
{
  // If Windows key is pressed, even if both Ctrl key and Alt key are pressed,
  // it's possible to match a shortcut key.
  if (IsWin()) {
    return true;
  }
  // Otherwise, when both Ctrl key and Alt key are pressed, it shouldn't be
  // a shortcut key for Windows since it means pressing AltGr key on
  // some keyboard layouts.
  if (IsControl() ^ IsAlt()) {
    return true;
  }
  // If no modifier key is active except a lockable modifier nor Shift key,
  // the key shouldn't match any shortcut keys (there are Space and
  // Shift+Space, though, let's ignore these special case...).
  return false;
}

bool
ModifierKeyState::IsCapsLocked() const
{
  return (mModifiers & MODIFIER_CAPSLOCK) != 0;
}

bool
ModifierKeyState::IsNumLocked() const
{
  return (mModifiers & MODIFIER_NUMLOCK) != 0;
}

bool
ModifierKeyState::IsScrollLocked() const
{
  return (mModifiers & MODIFIER_SCROLLLOCK) != 0;
}

void
ModifierKeyState::EnsureAltGr()
{
  // If both Control key and Alt key are pressed, it means AltGr is pressed.
  // Ideally, we should check whether the current keyboard layout has AltGr
  // or not.  However, setting AltGr flags for keyboard which doesn't have
  // AltGr must not be serious bug.  So, it should be OK for now.
  if (IsAltGr()) {
    mModifiers |= MODIFIER_ALTGRAPH;
  }
}

/*****************************************************************************
 * mozilla::widget::UniCharsAndModifiers
 *****************************************************************************/

void
UniCharsAndModifiers::Append(char16_t aUniChar, Modifiers aModifiers)
{
  mChars.Append(aUniChar);
  mModifiers.AppendElement(aModifiers);
}

void
UniCharsAndModifiers::FillModifiers(Modifiers aModifiers)
{
  for (size_t i = 0; i < Length(); i++) {
    mModifiers[i] = aModifiers;
  }
}

void
UniCharsAndModifiers::OverwriteModifiersIfBeginsWith(
                        const UniCharsAndModifiers& aOther)
{
  if (!BeginsWith(aOther)) {
    return;
  }
  for (size_t i = 0; i < aOther.Length(); ++i) {
    mModifiers[i] = aOther.mModifiers[i];
  }
}

bool
UniCharsAndModifiers::UniCharsEqual(const UniCharsAndModifiers& aOther) const
{
  return mChars.Equals(aOther.mChars);
}

bool
UniCharsAndModifiers::UniCharsCaseInsensitiveEqual(
                        const UniCharsAndModifiers& aOther) const
{
  nsCaseInsensitiveStringComparator comp;
  return mChars.Equals(aOther.mChars, comp);
}

bool
UniCharsAndModifiers::BeginsWith(const UniCharsAndModifiers& aOther) const
{
  return StringBeginsWith(mChars, aOther.mChars);
}

UniCharsAndModifiers&
UniCharsAndModifiers::operator+=(const UniCharsAndModifiers& aOther)
{
  mChars.Append(aOther.mChars);
  mModifiers.AppendElements(aOther.mModifiers);
  return *this;
}

UniCharsAndModifiers
UniCharsAndModifiers::operator+(const UniCharsAndModifiers& aOther) const
{
  UniCharsAndModifiers result(*this);
  result += aOther;
  return result;
}

/*****************************************************************************
 * mozilla::widget::VirtualKey
 *****************************************************************************/

// static
VirtualKey::ShiftState
VirtualKey::ModifiersToShiftState(Modifiers aModifiers)
{
  ShiftState state = 0;
  if (aModifiers & MODIFIER_SHIFT) {
    state |= STATE_SHIFT;
  }
  if (aModifiers & MODIFIER_CONTROL) {
    state |= STATE_CONTROL;
  }
  if (aModifiers & MODIFIER_ALT) {
    state |= STATE_ALT;
  }
  if (aModifiers & MODIFIER_CAPSLOCK) {
    state |= STATE_CAPSLOCK;
  }
  return state;
}

// static
Modifiers
VirtualKey::ShiftStateToModifiers(ShiftState aShiftState)
{
  Modifiers modifiers = 0;
  if (aShiftState & STATE_SHIFT) {
    modifiers |= MODIFIER_SHIFT;
  }
  if (aShiftState & STATE_CONTROL) {
    modifiers |= MODIFIER_CONTROL;
  }
  if (aShiftState & STATE_ALT) {
    modifiers |= MODIFIER_ALT;
  }
  if (aShiftState & STATE_CAPSLOCK) {
    modifiers |= MODIFIER_CAPSLOCK;
  }
  if ((modifiers & (MODIFIER_ALT | MODIFIER_CONTROL)) ==
         (MODIFIER_ALT | MODIFIER_CONTROL)) {
    modifiers |= MODIFIER_ALTGRAPH;
  }
  return modifiers;
}

inline char16_t
VirtualKey::GetCompositeChar(ShiftState aShiftState, char16_t aBaseChar) const
{
  return mShiftStates[aShiftState].DeadKey.Table->GetCompositeChar(aBaseChar);
}

const DeadKeyTable*
VirtualKey::MatchingDeadKeyTable(const DeadKeyEntry* aDeadKeyArray,
                                 uint32_t aEntries) const
{
  if (!mIsDeadKey) {
    return nullptr;
  }

  for (ShiftState shiftState = 0; shiftState < 16; shiftState++) {
    if (!IsDeadKey(shiftState)) {
      continue;
    }
    const DeadKeyTable* dkt = mShiftStates[shiftState].DeadKey.Table;
    if (dkt && dkt->IsEqual(aDeadKeyArray, aEntries)) {
      return dkt;
    }
  }

  return nullptr;
}

void
VirtualKey::SetNormalChars(ShiftState aShiftState,
                           const char16_t* aChars,
                           uint32_t aNumOfChars)
{
  NS_ASSERTION(aShiftState < ArrayLength(mShiftStates), "invalid index");

  SetDeadKey(aShiftState, false);

  for (uint32_t index = 0; index < aNumOfChars; index++) {
    // Ignore legacy non-printable control characters
    mShiftStates[aShiftState].Normal.Chars[index] =
      (aChars[index] >= 0x20) ? aChars[index] : 0;
  }

  uint32_t len = ArrayLength(mShiftStates[aShiftState].Normal.Chars);
  for (uint32_t index = aNumOfChars; index < len; index++) {
    mShiftStates[aShiftState].Normal.Chars[index] = 0;
  }
}

void
VirtualKey::SetDeadChar(ShiftState aShiftState, char16_t aDeadChar)
{
  NS_ASSERTION(aShiftState < ArrayLength(mShiftStates), "invalid index");

  SetDeadKey(aShiftState, true);

  mShiftStates[aShiftState].DeadKey.DeadChar = aDeadChar;
  mShiftStates[aShiftState].DeadKey.Table = nullptr;
}

UniCharsAndModifiers
VirtualKey::GetUniChars(ShiftState aShiftState) const
{
  UniCharsAndModifiers result = GetNativeUniChars(aShiftState);

  const ShiftState STATE_ALT_CONTROL = (STATE_ALT | STATE_CONTROL);
  if (!(aShiftState & STATE_ALT_CONTROL)) {
    return result;
  }

  if (result.IsEmpty()) {
    result = GetNativeUniChars(aShiftState & ~STATE_ALT_CONTROL);
    result.FillModifiers(ShiftStateToModifiers(aShiftState));
    return result;
  }

  if ((aShiftState & STATE_ALT_CONTROL) == STATE_ALT_CONTROL) {
    // Even if the shifted chars and the unshifted chars are same, we
    // should consume the Alt key state and the Ctrl key state when
    // AltGr key is pressed. Because if we don't consume them, the input
    // events are ignored on EditorBase. (I.e., Users cannot input the
    // characters with this key combination.)
    Modifiers finalModifiers = ShiftStateToModifiers(aShiftState);
    finalModifiers &= ~(MODIFIER_ALT | MODIFIER_CONTROL);
    result.FillModifiers(finalModifiers);
    return result;
  }

  UniCharsAndModifiers unmodifiedReslt =
    GetNativeUniChars(aShiftState & ~STATE_ALT_CONTROL);
  if (!result.UniCharsEqual(unmodifiedReslt)) {
    // Otherwise, we should consume the Alt key state and the Ctrl key state
    // only when the shifted chars and unshifted chars are different.
    Modifiers finalModifiers = ShiftStateToModifiers(aShiftState);
    finalModifiers &= ~(MODIFIER_ALT | MODIFIER_CONTROL);
    result.FillModifiers(finalModifiers);
  }
  return result;
}


UniCharsAndModifiers
VirtualKey::GetNativeUniChars(ShiftState aShiftState) const
{
#ifdef DEBUG
  if (aShiftState >= ArrayLength(mShiftStates)) {
    nsPrintfCString warning("Shift state is out of range: "
                            "aShiftState=%d, ArrayLength(mShiftState)=%d",
                            aShiftState, ArrayLength(mShiftStates));
    NS_WARNING(warning.get());
  }
#endif

  UniCharsAndModifiers result;
  Modifiers modifiers = ShiftStateToModifiers(aShiftState);
  if (IsDeadKey(aShiftState)) {
    result.Append(mShiftStates[aShiftState].DeadKey.DeadChar, modifiers);
    return result;
  }

  uint32_t index;
  uint32_t len = ArrayLength(mShiftStates[aShiftState].Normal.Chars);
  for (index = 0;
       index < len && mShiftStates[aShiftState].Normal.Chars[index]; index++) {
    result.Append(mShiftStates[aShiftState].Normal.Chars[index], modifiers);
  }
  return result;
}

// static
void
VirtualKey::FillKbdState(PBYTE aKbdState,
                         const ShiftState aShiftState)
{
  NS_ASSERTION(aShiftState < 16, "aShiftState out of range");

  if (aShiftState & STATE_SHIFT) {
    aKbdState[VK_SHIFT] |= 0x80;
  } else {
    aKbdState[VK_SHIFT]  &= ~0x80;
    aKbdState[VK_LSHIFT] &= ~0x80;
    aKbdState[VK_RSHIFT] &= ~0x80;
  }

  if (aShiftState & STATE_CONTROL) {
    aKbdState[VK_CONTROL] |= 0x80;
  } else {
    aKbdState[VK_CONTROL]  &= ~0x80;
    aKbdState[VK_LCONTROL] &= ~0x80;
    aKbdState[VK_RCONTROL] &= ~0x80;
  }

  if (aShiftState & STATE_ALT) {
    aKbdState[VK_MENU] |= 0x80;
  } else {
    aKbdState[VK_MENU]  &= ~0x80;
    aKbdState[VK_LMENU] &= ~0x80;
    aKbdState[VK_RMENU] &= ~0x80;
  }

  if (aShiftState & STATE_CAPSLOCK) {
    aKbdState[VK_CAPITAL] |= 0x01;
  } else {
    aKbdState[VK_CAPITAL] &= ~0x01;
  }
}

/*****************************************************************************
 * mozilla::widget::NativeKey
 *****************************************************************************/

uint8_t NativeKey::sDispatchedKeyOfAppCommand = 0;
NativeKey* NativeKey::sLatestInstance = nullptr;
const MSG NativeKey::sEmptyMSG = {};

LazyLogModule sNativeKeyLogger("NativeKeyWidgets");

NativeKey::NativeKey(nsWindowBase* aWidget,
                     const MSG& aMessage,
                     const ModifierKeyState& aModKeyState,
                     HKL aOverrideKeyboardLayout,
                     nsTArray<FakeCharMsg>* aFakeCharMsgs)
  : mLastInstance(sLatestInstance)
  , mRemovingMsg(sEmptyMSG)
  , mReceivedMsg(sEmptyMSG)
  , mWidget(aWidget)
  , mDispatcher(aWidget->GetTextEventDispatcher())
  , mMsg(aMessage)
  , mFocusedWndBeforeDispatch(::GetFocus())
  , mDOMKeyCode(0)
  , mKeyNameIndex(KEY_NAME_INDEX_Unidentified)
  , mCodeNameIndex(CODE_NAME_INDEX_UNKNOWN)
  , mModKeyState(aModKeyState)
  , mVirtualKeyCode(0)
  , mOriginalVirtualKeyCode(0)
  , mShiftedLatinChar(0)
  , mUnshiftedLatinChar(0)
  , mScanCode(0)
  , mIsExtended(false)
  , mIsDeadKey(false)
  , mCharMessageHasGone(false)
  , mCanIgnoreModifierStateAtKeyPress(true)
  , mFakeCharMsgs(aFakeCharMsgs && aFakeCharMsgs->Length() ?
                    aFakeCharMsgs : nullptr)
{
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p NativeKey::NativeKey(aWidget=0x%p { GetWindowHandle()=0x%p }, "
     "aMessage=%s, aModKeyState=%s), sLatestInstance=0x%p",
     this, aWidget, aWidget->GetWindowHandle(), ToString(aMessage).get(),
     ToString(aModKeyState).get(), sLatestInstance));

  MOZ_ASSERT(aWidget);
  MOZ_ASSERT(mDispatcher);
  sLatestInstance = this;
  KeyboardLayout* keyboardLayout = KeyboardLayout::GetInstance();
  mKeyboardLayout = keyboardLayout->GetLayout();
  if (aOverrideKeyboardLayout && mKeyboardLayout != aOverrideKeyboardLayout) {
    keyboardLayout->OverrideLayout(aOverrideKeyboardLayout);
    mKeyboardLayout = keyboardLayout->GetLayout();
    MOZ_ASSERT(mKeyboardLayout == aOverrideKeyboardLayout);
    mIsOverridingKeyboardLayout = true;
  } else {
    mIsOverridingKeyboardLayout = false;
  }

  if (mMsg.message == WM_APPCOMMAND) {
    InitWithAppCommand();
  } else {
    InitWithKeyChar();
  }

  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::NativeKey(), mKeyboardLayout=0x%08X, "
     "mFocusedWndBeforeDispatch=0x%p, mDOMKeyCode=0x%04X, "
     "mKeyNameIndex=%s, mCodeNameIndex=%s, mModKeyState=%s, "
     "mVirtualKeyCode=%s, mOriginalVirtualKeyCode=%s, "
     "mCommittedCharsAndModifiers=%s, mInputtingStringAndModifiers=%s, "
     "mShiftedString=%s, mUnshiftedString=%s, mShiftedLatinChar=%s, "
     "mUnshiftedLatinChar=%s, mScanCode=0x%04X, mIsExtended=%s, "
     "mIsDeadKey=%s, mIsPrintableKey=%s, mCharMessageHasGone=%s, "
     "mIsOverridingKeyboardLayout=%s",
     this, mKeyboardLayout, mFocusedWndBeforeDispatch,
     GetDOMKeyCodeName(mDOMKeyCode).get(), ToString(mKeyNameIndex).get(),
     ToString(mCodeNameIndex).get(),
     ToString(mModKeyState).get(),
     GetVirtualKeyCodeName(mVirtualKeyCode).get(),
     GetVirtualKeyCodeName(mOriginalVirtualKeyCode).get(),
     ToString(mCommittedCharsAndModifiers).get(),
     ToString(mInputtingStringAndModifiers).get(),
     ToString(mShiftedString).get(), ToString(mUnshiftedString).get(),
     GetCharacterCodeName(mShiftedLatinChar).get(),
     GetCharacterCodeName(mUnshiftedLatinChar).get(),
     mScanCode, GetBoolName(mIsExtended), GetBoolName(mIsDeadKey),
     GetBoolName(mIsPrintableKey), GetBoolName(mCharMessageHasGone),
     GetBoolName(mIsOverridingKeyboardLayout)));
}

void
NativeKey::InitWithKeyChar()
{
  mScanCode = WinUtils::GetScanCode(mMsg.lParam);
  mIsExtended = WinUtils::IsExtendedScanCode(mMsg.lParam);
  switch (mMsg.message) {
    case WM_KEYDOWN:
    case WM_SYSKEYDOWN:
    case WM_KEYUP:
    case WM_SYSKEYUP:
    case MOZ_WM_KEYDOWN:
    case MOZ_WM_KEYUP: {
      // First, resolve the IME converted virtual keycode to its original
      // keycode.
      if (mMsg.wParam == VK_PROCESSKEY) {
        mOriginalVirtualKeyCode =
          static_cast<uint8_t>(::ImmGetVirtualKey(mMsg.hwnd));
      } else {
        mOriginalVirtualKeyCode = static_cast<uint8_t>(mMsg.wParam);
      }

      // If the key message is sent from other application like a11y tools, the
      // scancode value might not be set proper value.  Then, probably the value
      // is 0.
      // NOTE: If the virtual keycode can be caused by both non-extended key
      //       and extended key, the API returns the non-extended key's
      //       scancode.  E.g., VK_LEFT causes "4" key on numpad.
      if (!mScanCode && mOriginalVirtualKeyCode != VK_PACKET) {
        uint16_t scanCodeEx = ComputeScanCodeExFromVirtualKeyCode(mMsg.wParam);
        if (scanCodeEx) {
          mScanCode = static_cast<uint8_t>(scanCodeEx & 0xFF);
          uint8_t extended = static_cast<uint8_t>((scanCodeEx & 0xFF00) >> 8);
          mIsExtended = (extended == 0xE0) || (extended == 0xE1);
        }
      }

      // Most keys are not distinguished as left or right keys.
      bool isLeftRightDistinguishedKey = false;

      // mOriginalVirtualKeyCode must not distinguish left or right of
      // Shift, Control or Alt.
      switch (mOriginalVirtualKeyCode) {
        case VK_SHIFT:
        case VK_CONTROL:
        case VK_MENU:
          isLeftRightDistinguishedKey = true;
          break;
        case VK_LSHIFT:
        case VK_RSHIFT:
          mVirtualKeyCode = mOriginalVirtualKeyCode;
          mOriginalVirtualKeyCode = VK_SHIFT;
          isLeftRightDistinguishedKey = true;
          break;
        case VK_LCONTROL:
        case VK_RCONTROL:
          mVirtualKeyCode = mOriginalVirtualKeyCode;
          mOriginalVirtualKeyCode = VK_CONTROL;
          isLeftRightDistinguishedKey = true;
          break;
        case VK_LMENU:
        case VK_RMENU:
          mVirtualKeyCode = mOriginalVirtualKeyCode;
          mOriginalVirtualKeyCode = VK_MENU;
          isLeftRightDistinguishedKey = true;
          break;
      }

      // If virtual keycode (left-right distinguished keycode) is already
      // computed, we don't need to do anymore.
      if (mVirtualKeyCode) {
        break;
      }

      // If the keycode doesn't have LR distinguished keycode, we just set
      // mOriginalVirtualKeyCode to mVirtualKeyCode.  Note that don't compute
      // it from MapVirtualKeyEx() because the scan code might be wrong if
      // the message is sent/posted by other application.  Then, we will compute
      // unexpected keycode from the scan code.
      if (!isLeftRightDistinguishedKey) {
        break;
      }

      NS_ASSERTION(!mVirtualKeyCode,
                   "mVirtualKeyCode has been computed already");

      // Otherwise, compute the virtual keycode with MapVirtualKeyEx().
      mVirtualKeyCode = ComputeVirtualKeyCodeFromScanCodeEx();

      // Following code shouldn't be used now because we compute scancode value
      // if we detect that the sender doesn't set proper scancode.
      // However, the detection might fail. Therefore, let's keep using this.
      switch (mOriginalVirtualKeyCode) {
        case VK_CONTROL:
          if (mVirtualKeyCode != VK_LCONTROL &&
              mVirtualKeyCode != VK_RCONTROL) {
            mVirtualKeyCode = mIsExtended ? VK_RCONTROL : VK_LCONTROL;
          }
          break;
        case VK_MENU:
          if (mVirtualKeyCode != VK_LMENU && mVirtualKeyCode != VK_RMENU) {
            mVirtualKeyCode = mIsExtended ? VK_RMENU : VK_LMENU;
          }
          break;
        case VK_SHIFT:
          if (mVirtualKeyCode != VK_LSHIFT && mVirtualKeyCode != VK_RSHIFT) {
            // Neither left shift nor right shift is an extended key,
            // let's use VK_LSHIFT for unknown mapping.
            mVirtualKeyCode = VK_LSHIFT;
          }
          break;
        default:
          MOZ_CRASH("Unsupported mOriginalVirtualKeyCode");
      }
      break;
    }
    case WM_CHAR:
    case WM_UNICHAR:
    case WM_SYSCHAR:
      // If there is another instance and it is trying to remove a char message
      // from the queue, this message should be handled in the old instance.
      if (IsAnotherInstanceRemovingCharMessage()) {
        // XXX Do we need to make mReceivedMsg an array?
        MOZ_ASSERT(IsEmptyMSG(mLastInstance->mReceivedMsg));
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::InitWithKeyChar(), WARNING, detecting another "
           "instance is trying to remove a char message, so, this instance "
           "should do nothing, mLastInstance=0x%p, mRemovingMsg=%s, "
           "mReceivedMsg=%s",
           this, mLastInstance, ToString(mLastInstance->mRemovingMsg).get(),
           ToString(mLastInstance->mReceivedMsg).get()));
        mLastInstance->mReceivedMsg = mMsg;
        return;
      }

      // NOTE: If other applications like a11y tools sends WM_*CHAR without
      //       scancode, we cannot compute virtual keycode.  I.e., with such
      //       applications, we cannot generate proper KeyboardEvent.code value.

      mVirtualKeyCode = mOriginalVirtualKeyCode =
        ComputeVirtualKeyCodeFromScanCodeEx();
      NS_ASSERTION(mVirtualKeyCode, "Failed to compute virtual keycode");
      break;
    default:
      MOZ_CRASH("Unsupported message");
  }

  if (!mVirtualKeyCode) {
    mVirtualKeyCode = mOriginalVirtualKeyCode;
  }

  KeyboardLayout* keyboardLayout = KeyboardLayout::GetInstance();
  mDOMKeyCode =
    keyboardLayout->ConvertNativeKeyCodeToDOMKeyCode(mOriginalVirtualKeyCode);
  // Be aware, keyboard utilities can change non-printable keys to printable
  // keys.  In such case, we should make the key value as a printable key.
  // FYI: IsFollowedByPrintableCharMessage() returns true only when it's
  //      handling a keydown message.
  mKeyNameIndex = IsFollowedByPrintableCharMessage() ?
    KEY_NAME_INDEX_USE_STRING :
    keyboardLayout->ConvertNativeKeyCodeToKeyNameIndex(mOriginalVirtualKeyCode);
  mCodeNameIndex =
    KeyboardLayout::ConvertScanCodeToCodeNameIndex(
      GetScanCodeWithExtendedFlag());

  // If next message of WM_(SYS)KEYDOWN is WM_*CHAR message and the key
  // combination is not reserved by the system, let's consume it now.
  // TODO: We cannot initialize mCommittedCharsAndModifiers for VK_PACKET
  //       if the message is WM_KEYUP because we don't have preceding
  //       WM_CHAR message.
  // TODO: Like Edge, we shouldn't dispatch two sets of keyboard events
  //       for a Unicode character in non-BMP because its key value looks
  //       broken and not good thing for our editor if only one keydown or
  //       keypress event's default is prevented.  I guess, we should store
  //       key message information globally and we should wait following
  //       WM_KEYDOWN if following WM_CHAR is a part of a Unicode character.
  if ((mMsg.message == WM_KEYDOWN || mMsg.message == WM_SYSKEYDOWN) &&
      !IsReservedBySystem()) {
    MSG charMsg;
    while (GetFollowingCharMessage(charMsg)) {
      // Although, got message shouldn't be WM_NULL in desktop apps,
      // we should keep checking this.  FYI: This was added for Metrofox.
      if (charMsg.message == WM_NULL) {
        continue;
      }
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::InitWithKeyChar(), removed char message, %s",
         this, ToString(charMsg).get()));
      NS_WARN_IF(charMsg.hwnd != mMsg.hwnd);
      mFollowingCharMsgs.AppendElement(charMsg);
    }
  }

  keyboardLayout->InitNativeKey(*this, mModKeyState);

  mIsDeadKey =
    (IsFollowedByDeadCharMessage() ||
     keyboardLayout->IsDeadKey(mOriginalVirtualKeyCode, mModKeyState));
  mIsPrintableKey =
    mKeyNameIndex == KEY_NAME_INDEX_USE_STRING ||
    KeyboardLayout::IsPrintableCharKey(mOriginalVirtualKeyCode);

  if (IsKeyDownMessage()) {
    // Compute some strings which may be inputted by the key with various
    // modifier state if this key event won't cause text input actually.
    // They will be used for setting mAlternativeCharCodes in the callback
    // method which will be called by TextEventDispatcher.
    if (!IsFollowedByPrintableCharMessage()) {
      ComputeInputtingStringWithKeyboardLayout();
    }
    // Remove odd char messages if there are.
    RemoveFollowingOddCharMessages();
  }
}

void
NativeKey::InitCommittedCharsAndModifiersWithFollowingCharMessages(
             const ModifierKeyState& aModKeyState)
{
  mCommittedCharsAndModifiers.Clear();
  // This should cause inputting text in focused editor.  However, it
  // ignores keypress events whose altKey or ctrlKey is true.
  // Therefore, we need to remove these modifier state here.
  Modifiers modifiers = aModKeyState.GetModifiers();
  if (IsFollowedByPrintableCharMessage()) {
    modifiers &= ~(MODIFIER_ALT | MODIFIER_CONTROL);
  }
  // NOTE: This method assumes that WM_CHAR and WM_SYSCHAR are never retrieved
  //       at same time.
  for (size_t i = 0; i < mFollowingCharMsgs.Length(); ++i) {
    // Ignore non-printable char messages.
    if (!IsPrintableCharOrSysCharMessage(mFollowingCharMsgs[i])) {
      continue;
    }
    char16_t ch = static_cast<char16_t>(mFollowingCharMsgs[i].wParam);
    mCommittedCharsAndModifiers.Append(ch, modifiers);
  }
}

NativeKey::~NativeKey()
{
  MOZ_LOG(sNativeKeyLogger, LogLevel::Debug,
    ("%p   NativeKey::~NativeKey(), destroyed", this));
  if (mIsOverridingKeyboardLayout) {
    KeyboardLayout* keyboardLayout = KeyboardLayout::GetInstance();
    keyboardLayout->RestoreLayout();
  }
  sLatestInstance = mLastInstance;
}

void
NativeKey::InitWithAppCommand()
{
  if (GET_DEVICE_LPARAM(mMsg.lParam) != FAPPCOMMAND_KEY) {
    return;
  }

  uint32_t appCommand = GET_APPCOMMAND_LPARAM(mMsg.lParam);
  switch (GET_APPCOMMAND_LPARAM(mMsg.lParam)) {

#undef NS_APPCOMMAND_TO_DOM_KEY_NAME_INDEX
#define NS_APPCOMMAND_TO_DOM_KEY_NAME_INDEX(aAppCommand, aKeyNameIndex) \
    case aAppCommand: \
      mKeyNameIndex = aKeyNameIndex; \
      break;

#include "NativeKeyToDOMKeyName.h"

#undef NS_APPCOMMAND_TO_DOM_KEY_NAME_INDEX

    default:
      mKeyNameIndex = KEY_NAME_INDEX_Unidentified;
  }

  // Guess the virtual keycode which caused this message.
  switch (appCommand) {
    case APPCOMMAND_BROWSER_BACKWARD:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_BROWSER_BACK;
      break;
    case APPCOMMAND_BROWSER_FORWARD:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_BROWSER_FORWARD;
      break;
    case APPCOMMAND_BROWSER_REFRESH:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_BROWSER_REFRESH;
      break;
    case APPCOMMAND_BROWSER_STOP:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_BROWSER_STOP;
      break;
    case APPCOMMAND_BROWSER_SEARCH:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_BROWSER_SEARCH;
      break;
    case APPCOMMAND_BROWSER_FAVORITES:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_BROWSER_FAVORITES;
      break;
    case APPCOMMAND_BROWSER_HOME:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_BROWSER_HOME;
      break;
    case APPCOMMAND_VOLUME_MUTE:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_VOLUME_MUTE;
      break;
    case APPCOMMAND_VOLUME_DOWN:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_VOLUME_DOWN;
      break;
    case APPCOMMAND_VOLUME_UP:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_VOLUME_UP;
      break;
    case APPCOMMAND_MEDIA_NEXTTRACK:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_MEDIA_NEXT_TRACK;
      break;
    case APPCOMMAND_MEDIA_PREVIOUSTRACK:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_MEDIA_PREV_TRACK;
      break;
    case APPCOMMAND_MEDIA_STOP:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_MEDIA_STOP;
      break;
    case APPCOMMAND_MEDIA_PLAY_PAUSE:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_MEDIA_PLAY_PAUSE;
      break;
    case APPCOMMAND_LAUNCH_MAIL:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_LAUNCH_MAIL;
      break;
    case APPCOMMAND_LAUNCH_MEDIA_SELECT:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_LAUNCH_MEDIA_SELECT;
      break;
    case APPCOMMAND_LAUNCH_APP1:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_LAUNCH_APP1;
      break;
    case APPCOMMAND_LAUNCH_APP2:
      mVirtualKeyCode = mOriginalVirtualKeyCode = VK_LAUNCH_APP2;
      break;
    default:
      return;
  }

  uint16_t scanCodeEx = ComputeScanCodeExFromVirtualKeyCode(mVirtualKeyCode);
  mScanCode = static_cast<uint8_t>(scanCodeEx & 0xFF);
  uint8_t extended = static_cast<uint8_t>((scanCodeEx & 0xFF00) >> 8);
  mIsExtended = (extended == 0xE0) || (extended == 0xE1);
  mDOMKeyCode =
    KeyboardLayout::GetInstance()->
      ConvertNativeKeyCodeToDOMKeyCode(mOriginalVirtualKeyCode);
  mCodeNameIndex =
    KeyboardLayout::ConvertScanCodeToCodeNameIndex(
      GetScanCodeWithExtendedFlag());
}

// static
bool
NativeKey::IsControlChar(char16_t aChar)
{
  static const char16_t U_SPACE = 0x20;
  static const char16_t U_DELETE = 0x7F;
  return aChar < U_SPACE || aChar == U_DELETE;
}

bool
NativeKey::IsFollowedByDeadCharMessage() const
{
  if (mFollowingCharMsgs.IsEmpty()) {
    return false;
  }
  return IsDeadCharMessage(mFollowingCharMsgs[0]);
}

bool
NativeKey::IsFollowedByPrintableCharMessage() const
{
  for (size_t i = 0; i < mFollowingCharMsgs.Length(); ++i) {
    if (IsPrintableCharMessage(mFollowingCharMsgs[i])) {
      return true;
    }
  }
  return false;
}

bool
NativeKey::IsFollowedByPrintableCharOrSysCharMessage() const
{
  for (size_t i = 0; i < mFollowingCharMsgs.Length(); ++i) {
    if (IsPrintableCharOrSysCharMessage(mFollowingCharMsgs[i])) {
      return true;
    }
  }
  return false;
}

bool
NativeKey::IsReservedBySystem() const
{
  // Alt+Space key is handled by OS, we shouldn't touch it.
  if (mModKeyState.IsAlt() && !mModKeyState.IsControl() &&
      mVirtualKeyCode == VK_SPACE) {
    return true;
  }

  // XXX How about Alt+F4? We receive WM_SYSKEYDOWN for F4 before closing the
  //     window.  Although, we don't prevent to close the window but the key
  //     event shouldn't be exposed to the web.

  return false;
}

bool
NativeKey::IsIMEDoingKakuteiUndo() const
{
  // Following message pattern is caused by "Kakutei-Undo" of ATOK or WXG:
  // ---------------------------------------------------------------------------
  // WM_KEYDOWN              * n (wParam = VK_BACK, lParam = 0x1)
  // WM_KEYUP                * 1 (wParam = VK_BACK, lParam = 0xC0000001) # ATOK
  // WM_IME_STARTCOMPOSITION * 1 (wParam = 0x0, lParam = 0x0)
  // WM_IME_COMPOSITION      * 1 (wParam = 0x0, lParam = 0x1BF)
  // WM_CHAR                 * n (wParam = VK_BACK, lParam = 0x1)
  // WM_KEYUP                * 1 (wParam = VK_BACK, lParam = 0xC00E0001)
  // ---------------------------------------------------------------------------
  // This doesn't match usual key message pattern such as:
  //   WM_KEYDOWN -> WM_CHAR -> WM_KEYDOWN -> WM_CHAR -> ... -> WM_KEYUP
  // See following bugs for the detail.
  // https://bugzilla.mozilla.gr.jp/show_bug.cgi?id=2885 (written in Japanese)
  // https://bugzilla.mozilla.org/show_bug.cgi?id=194559 (written in English)
  MSG startCompositionMsg, compositionMsg, charMsg;
  return WinUtils::PeekMessage(&startCompositionMsg, mMsg.hwnd,
                               WM_IME_STARTCOMPOSITION, WM_IME_STARTCOMPOSITION,
                               PM_NOREMOVE | PM_NOYIELD) &&
         WinUtils::PeekMessage(&compositionMsg, mMsg.hwnd, WM_IME_COMPOSITION,
                               WM_IME_COMPOSITION, PM_NOREMOVE | PM_NOYIELD) &&
         WinUtils::PeekMessage(&charMsg, mMsg.hwnd, WM_CHAR, WM_CHAR,
                               PM_NOREMOVE | PM_NOYIELD) &&
         startCompositionMsg.wParam == 0x0 &&
         startCompositionMsg.lParam == 0x0 &&
         compositionMsg.wParam == 0x0 &&
         compositionMsg.lParam == 0x1BF &&
         charMsg.wParam == VK_BACK && charMsg.lParam == 0x1 &&
         startCompositionMsg.time <= compositionMsg.time &&
         compositionMsg.time <= charMsg.time;
}

void
NativeKey::RemoveFollowingOddCharMessages()
{
  MOZ_ASSERT(IsKeyDownMessage());

  // If the keydown message is synthesized for automated tests, there is
  // nothing to do here.
  if (mFakeCharMsgs) {
    return;
  }

  // If there are some following char messages before another key message,
  // there is nothing to do here.
  if (!mFollowingCharMsgs.IsEmpty()) {
    return;
  }

  // If the handling key isn't Backspace, there is nothing to do here.
  if (mOriginalVirtualKeyCode != VK_BACK) {
    return;
  }

  // If we don't see the odd message pattern, there is nothing to do here.
  if (!IsIMEDoingKakuteiUndo()) {
    return;
  }

  // Otherwise, we need to remove odd WM_CHAR messages for ATOK or WXG (both
  // of them are Japanese IME).
  MSG msg;
  while (WinUtils::PeekMessage(&msg, mMsg.hwnd, WM_CHAR, WM_CHAR,
                               PM_REMOVE | PM_NOYIELD)) {
    if (msg.message != WM_CHAR) {
      MOZ_RELEASE_ASSERT(msg.message == WM_NULL,
                         "Unexpected message was removed");
      continue;
    }
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::RemoveFollowingOddCharMessages(), removed odd char "
       "message, %s",
       this, ToString(msg).get()));
    mRemovedOddCharMsgs.AppendElement(msg);
  }
}

UINT
NativeKey::GetScanCodeWithExtendedFlag() const
{
  if (!mIsExtended) {
    return mScanCode;
  }
  return (0xE000 | mScanCode);
}

uint32_t
NativeKey::GetKeyLocation() const
{
  switch (mVirtualKeyCode) {
    case VK_LSHIFT:
    case VK_LCONTROL:
    case VK_LMENU:
    case VK_LWIN:
      return nsIDOMKeyEvent::DOM_KEY_LOCATION_LEFT;

    case VK_RSHIFT:
    case VK_RCONTROL:
    case VK_RMENU:
    case VK_RWIN:
      return nsIDOMKeyEvent::DOM_KEY_LOCATION_RIGHT;

    case VK_RETURN:
      // XXX This code assumes that all keyboard drivers use same mapping.
      return !mIsExtended ? nsIDOMKeyEvent::DOM_KEY_LOCATION_STANDARD :
                            nsIDOMKeyEvent::DOM_KEY_LOCATION_NUMPAD;

    case VK_INSERT:
    case VK_DELETE:
    case VK_END:
    case VK_DOWN:
    case VK_NEXT:
    case VK_LEFT:
    case VK_CLEAR:
    case VK_RIGHT:
    case VK_HOME:
    case VK_UP:
    case VK_PRIOR:
      // XXX This code assumes that all keyboard drivers use same mapping.
      return mIsExtended ? nsIDOMKeyEvent::DOM_KEY_LOCATION_STANDARD :
                           nsIDOMKeyEvent::DOM_KEY_LOCATION_NUMPAD;

    // NumLock key isn't included due to IE9's behavior.
    case VK_NUMPAD0:
    case VK_NUMPAD1:
    case VK_NUMPAD2:
    case VK_NUMPAD3:
    case VK_NUMPAD4:
    case VK_NUMPAD5:
    case VK_NUMPAD6:
    case VK_NUMPAD7:
    case VK_NUMPAD8:
    case VK_NUMPAD9:
    case VK_DECIMAL:
    case VK_DIVIDE:
    case VK_MULTIPLY:
    case VK_SUBTRACT:
    case VK_ADD:
    // Separator key of Brazilian keyboard or JIS keyboard for Mac
    case VK_ABNT_C2:
      return nsIDOMKeyEvent::DOM_KEY_LOCATION_NUMPAD;

    case VK_SHIFT:
    case VK_CONTROL:
    case VK_MENU:
      NS_WARNING("Failed to decide the key location?");

    default:
      return nsIDOMKeyEvent::DOM_KEY_LOCATION_STANDARD;
  }
}

uint8_t
NativeKey::ComputeVirtualKeyCodeFromScanCode() const
{
  return static_cast<uint8_t>(
           ::MapVirtualKeyEx(mScanCode, MAPVK_VSC_TO_VK, mKeyboardLayout));
}

uint8_t
NativeKey::ComputeVirtualKeyCodeFromScanCodeEx() const
{
  // MapVirtualKeyEx() has been improved for supporting extended keys since
  // Vista.  When we call it for mapping a scancode of an extended key and
  // a virtual keycode, we need to add 0xE000 to the scancode.
  return static_cast<uint8_t>(
           ::MapVirtualKeyEx(GetScanCodeWithExtendedFlag(), MAPVK_VSC_TO_VK_EX,
                             mKeyboardLayout));
}

uint16_t
NativeKey::ComputeScanCodeExFromVirtualKeyCode(UINT aVirtualKeyCode) const
{
  return static_cast<uint16_t>(
           ::MapVirtualKeyEx(aVirtualKeyCode,
                             MAPVK_VK_TO_VSC_EX,
                             mKeyboardLayout));
}

char16_t
NativeKey::ComputeUnicharFromScanCode() const
{
  return static_cast<char16_t>(
           ::MapVirtualKeyEx(ComputeVirtualKeyCodeFromScanCode(),
                             MAPVK_VK_TO_CHAR, mKeyboardLayout));
}

nsEventStatus
NativeKey::InitKeyEvent(WidgetKeyboardEvent& aKeyEvent,
                        const MSG* aMsgSentToPlugin) const
{
  return InitKeyEvent(aKeyEvent, mModKeyState, aMsgSentToPlugin);
}

nsEventStatus
NativeKey::InitKeyEvent(WidgetKeyboardEvent& aKeyEvent,
                        const ModifierKeyState& aModKeyState,
                        const MSG* aMsgSentToPlugin) const
{
  if (mWidget->Destroyed()) {
    MOZ_CRASH("NativeKey tries to dispatch a key event on destroyed widget");
  }

  LayoutDeviceIntPoint point(0, 0);
  mWidget->InitEvent(aKeyEvent, &point);

  switch (aKeyEvent.mMessage) {
    case eKeyDown:
      // If it was followed by a char message but it was consumed by somebody,
      // we should mark it as consumed because somebody must have handled it
      // and we should prevent to do "double action" for the key operation.
      if (mCharMessageHasGone) {
        aKeyEvent.PreventDefaultBeforeDispatch();
      }
      MOZ_FALLTHROUGH;
    case eKeyDownOnPlugin:
      aKeyEvent.mKeyCode = mDOMKeyCode;
      // Unique id for this keydown event and its associated keypress.
      sUniqueKeyEventId++;
      aKeyEvent.mUniqueId = sUniqueKeyEventId;
      break;
    case eKeyUp:
    case eKeyUpOnPlugin:
      aKeyEvent.mKeyCode = mDOMKeyCode;
      // Set defaultPrevented of the key event if the VK_MENU is not a system
      // key release, so that the menu bar does not trigger.  This helps avoid
      // triggering the menu bar for ALT key accelerators used in assistive
      // technologies such as Window-Eyes and ZoomText or for switching open
      // state of IME.
      if (mOriginalVirtualKeyCode == VK_MENU && mMsg.message != WM_SYSKEYUP) {
        aKeyEvent.PreventDefaultBeforeDispatch();
      }
      break;
    case eKeyPress:
      MOZ_ASSERT(!mCharMessageHasGone,
                 "If following char message was consumed by somebody, "
                 "keydown event should be consumed above");
      aKeyEvent.mUniqueId = sUniqueKeyEventId;
      break;
    default:
      MOZ_CRASH("Invalid event message");
  }

  aKeyEvent.mIsRepeat = IsRepeat();
  aKeyEvent.mKeyNameIndex = mKeyNameIndex;
  if (mKeyNameIndex == KEY_NAME_INDEX_USE_STRING) {
    aKeyEvent.mKeyValue = mCommittedCharsAndModifiers.ToString();
  }
  aKeyEvent.mCodeNameIndex = mCodeNameIndex;
  MOZ_ASSERT(mCodeNameIndex != CODE_NAME_INDEX_USE_STRING);
  aKeyEvent.mLocation = GetKeyLocation();
  aModKeyState.InitInputEvent(aKeyEvent);

  if (aMsgSentToPlugin) {
    MaybeInitPluginEventOfKeyEvent(aKeyEvent, *aMsgSentToPlugin);
  }

  KeyboardLayout::NotifyIdleServiceOfUserActivity();

  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::InitKeyEvent(), initialized, aKeyEvent={ "
     "mMessage=%s, mKeyNameIndex=%s, mKeyValue=\"%s\", mCodeNameIndex=%s, "
     "mKeyCode=%s, mLocation=%s, mModifiers=%s, DefaultPrevented()=%s }",
     this, ToChar(aKeyEvent.mMessage),
     ToString(aKeyEvent.mKeyNameIndex).get(),
     NS_ConvertUTF16toUTF8(aKeyEvent.mKeyValue).get(),
     ToString(aKeyEvent.mCodeNameIndex).get(),
     GetDOMKeyCodeName(aKeyEvent.mKeyCode).get(),
     GetKeyLocationName(aKeyEvent.mLocation).get(),
     GetModifiersName(aKeyEvent.mModifiers).get(),
     GetBoolName(aKeyEvent.DefaultPrevented())));

  return aKeyEvent.DefaultPrevented() ? nsEventStatus_eConsumeNoDefault :
                                        nsEventStatus_eIgnore;
}

void
NativeKey::MaybeInitPluginEventOfKeyEvent(WidgetKeyboardEvent& aKeyEvent,
                                          const MSG& aMsgSentToPlugin) const
{
  if (mWidget->GetInputContext().mIMEState.mEnabled != IMEState::PLUGIN) {
    return;
  }
  NPEvent pluginEvent;
  pluginEvent.event = aMsgSentToPlugin.message;
  pluginEvent.wParam = aMsgSentToPlugin.wParam;
  pluginEvent.lParam = aMsgSentToPlugin.lParam;
  aKeyEvent.mPluginEvent.Copy(pluginEvent);
}

bool
NativeKey::DispatchCommandEvent(uint32_t aEventCommand) const
{
  nsCOMPtr<nsIAtom> command;
  switch (aEventCommand) {
    case APPCOMMAND_BROWSER_BACKWARD:
      command = nsGkAtoms::Back;
      break;
    case APPCOMMAND_BROWSER_FORWARD:
      command = nsGkAtoms::Forward;
      break;
    case APPCOMMAND_BROWSER_REFRESH:
      command = nsGkAtoms::Reload;
      break;
    case APPCOMMAND_BROWSER_STOP:
      command = nsGkAtoms::Stop;
      break;
    case APPCOMMAND_BROWSER_SEARCH:
      command = nsGkAtoms::Search;
      break;
    case APPCOMMAND_BROWSER_FAVORITES:
      command = nsGkAtoms::Bookmarks;
      break;
    case APPCOMMAND_BROWSER_HOME:
      command = nsGkAtoms::Home;
      break;
    case APPCOMMAND_CLOSE:
      command = nsGkAtoms::Close;
      break;
    case APPCOMMAND_FIND:
      command = nsGkAtoms::Find;
      break;
    case APPCOMMAND_HELP:
      command = nsGkAtoms::Help;
      break;
    case APPCOMMAND_NEW:
      command = nsGkAtoms::New;
      break;
    case APPCOMMAND_OPEN:
      command = nsGkAtoms::Open;
      break;
    case APPCOMMAND_PRINT:
      command = nsGkAtoms::Print;
      break;
    case APPCOMMAND_SAVE:
      command = nsGkAtoms::Save;
      break;
    case APPCOMMAND_FORWARD_MAIL:
      command = nsGkAtoms::ForwardMail;
      break;
    case APPCOMMAND_REPLY_TO_MAIL:
      command = nsGkAtoms::ReplyToMail;
      break;
    case APPCOMMAND_SEND_MAIL:
      command = nsGkAtoms::SendMail;
      break;
    case APPCOMMAND_MEDIA_NEXTTRACK:
      command = nsGkAtoms::NextTrack;
      break;
    case APPCOMMAND_MEDIA_PREVIOUSTRACK:
      command = nsGkAtoms::PreviousTrack;
      break;
    case APPCOMMAND_MEDIA_STOP:
      command = nsGkAtoms::MediaStop;
      break;
    case APPCOMMAND_MEDIA_PLAY_PAUSE:
      command = nsGkAtoms::PlayPause;
      break;
    default:
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::DispatchCommandEvent(), doesn't dispatch command "
         "event", this));
      return false;
  }
  WidgetCommandEvent commandEvent(true, nsGkAtoms::onAppCommand,
                                  command, mWidget);

  mWidget->InitEvent(commandEvent);
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::DispatchCommandEvent(), dispatching %s command event...",
     this, nsAtomCString(command).get()));
  bool ok = mWidget->DispatchWindowEvent(&commandEvent) || mWidget->Destroyed();
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::DispatchCommandEvent(), dispatched command event, "
     "result=%s, mWidget->Destroyed()=%s",
     this, GetBoolName(ok), GetBoolName(mWidget->Destroyed())));
  return ok;
}

bool
NativeKey::HandleAppCommandMessage() const
{
  // If the widget has gone, we should do nothing.
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
      ("%p   NativeKey::HandleAppCommandMessage(), WARNING, not handled due to "
       "destroyed the widget", this));
    return false;
  }

  // NOTE: Typical behavior of WM_APPCOMMAND caused by key is, WM_APPCOMMAND
  //       message is _sent_ first.  Then, the DefaultWndProc will _post_
  //       WM_KEYDOWN message and WM_KEYUP message if the keycode for the
  //       command is available (i.e., mVirtualKeyCode is not 0).

  // NOTE: IntelliType (Microsoft's keyboard utility software) always consumes
  //       WM_KEYDOWN and WM_KEYUP.

  // Let's dispatch keydown message before our chrome handles the command
  // when the message is caused by a keypress.  This behavior makes handling
  // WM_APPCOMMAND be a default action of the keydown event.  This means that
  // web applications can handle multimedia keys and prevent our default action.
  // This allow web applications to provide better UX for multimedia keyboard
  // users.
  bool dispatchKeyEvent = (GET_DEVICE_LPARAM(mMsg.lParam) == FAPPCOMMAND_KEY);
  if (dispatchKeyEvent) {
    // If a plug-in window has focus but it didn't consume the message, our
    // window receive WM_APPCOMMAND message.  In this case, we shouldn't
    // dispatch KeyboardEvents because an event handler may access the
    // plug-in process synchronously.
    dispatchKeyEvent =
      WinUtils::IsOurProcessWindow(reinterpret_cast<HWND>(mMsg.wParam));
  }

  bool consumed = false;

  if (dispatchKeyEvent) {
    nsresult rv = mDispatcher->BeginNativeInputTransaction();
    if (NS_WARN_IF(NS_FAILED(rv))) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
        ("%p   NativeKey::HandleAppCommandMessage(), FAILED due to "
         "BeginNativeInputTransaction() failure", this));
      return true;
    }
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleAppCommandMessage(), initializing keydown "
       "event...", this));
    WidgetKeyboardEvent keydownEvent(true, eKeyDown, mWidget);
    nsEventStatus status = InitKeyEvent(keydownEvent, mModKeyState, &mMsg);
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleAppCommandMessage(), tries to dispatch "
       "keydown event...", this));
    // NOTE: If the keydown event is consumed by web contents, we shouldn't
    //       continue to handle the command.
    if (!mDispatcher->DispatchKeyboardEvent(eKeyDown, keydownEvent, status,
                                            const_cast<NativeKey*>(this))) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleAppCommandMessage(), keydown event isn't "
         "dispatched", this));
      // If keyboard event wasn't fired, there must be composition.
      // So, we don't need to dispatch a command event.
      return true;
    }
    consumed = status == nsEventStatus_eConsumeNoDefault;
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleAppCommandMessage(), keydown event was "
       "dispatched, consumed=%s",
       this, GetBoolName(consumed)));
    sDispatchedKeyOfAppCommand = mVirtualKeyCode;
    if (mWidget->Destroyed()) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleAppCommandMessage(), keydown event caused "
         "destroying the widget", this));
      return true;
    }
  }

  // Dispatch a command event or a content command event if the command is
  // supported.
  if (!consumed) {
    uint32_t appCommand = GET_APPCOMMAND_LPARAM(mMsg.lParam);
    EventMessage contentCommandMessage = eVoidEvent;
    switch (appCommand) {
      case APPCOMMAND_BROWSER_BACKWARD:
      case APPCOMMAND_BROWSER_FORWARD:
      case APPCOMMAND_BROWSER_REFRESH:
      case APPCOMMAND_BROWSER_STOP:
      case APPCOMMAND_BROWSER_SEARCH:
      case APPCOMMAND_BROWSER_FAVORITES:
      case APPCOMMAND_BROWSER_HOME:
      case APPCOMMAND_CLOSE:
      case APPCOMMAND_FIND:
      case APPCOMMAND_HELP:
      case APPCOMMAND_NEW:
      case APPCOMMAND_OPEN:
      case APPCOMMAND_PRINT:
      case APPCOMMAND_SAVE:
      case APPCOMMAND_FORWARD_MAIL:
      case APPCOMMAND_REPLY_TO_MAIL:
      case APPCOMMAND_SEND_MAIL:
      case APPCOMMAND_MEDIA_NEXTTRACK:
      case APPCOMMAND_MEDIA_PREVIOUSTRACK:
      case APPCOMMAND_MEDIA_STOP:
      case APPCOMMAND_MEDIA_PLAY_PAUSE:
        // We shouldn't consume the message always because if we don't handle
        // the message, the sender (typically, utility of keyboard or mouse)
        // may send other key messages which indicate well known shortcut key.
        consumed = DispatchCommandEvent(appCommand);
        break;

      // Use content command for following commands:
      case APPCOMMAND_COPY:
        contentCommandMessage = eContentCommandCopy;
        break;
      case APPCOMMAND_CUT:
        contentCommandMessage = eContentCommandCut;
        break;
      case APPCOMMAND_PASTE:
        contentCommandMessage = eContentCommandPaste;
        break;
      case APPCOMMAND_REDO:
        contentCommandMessage = eContentCommandRedo;
        break;
      case APPCOMMAND_UNDO:
        contentCommandMessage = eContentCommandUndo;
        break;
    }

    if (contentCommandMessage) {
      MOZ_ASSERT(!mWidget->Destroyed());
      WidgetContentCommandEvent contentCommandEvent(true, contentCommandMessage,
                                                    mWidget);
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleAppCommandMessage(), dispatching %s event...",
         this, ToChar(contentCommandMessage)));
      mWidget->DispatchWindowEvent(&contentCommandEvent);
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleAppCommandMessage(), dispatched %s event",
         this, ToChar(contentCommandMessage)));
      consumed = true;

      if (mWidget->Destroyed()) {
        MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
          ("%p   NativeKey::HandleAppCommandMessage(), %s event caused "
           "destroying the widget",
           this, ToChar(contentCommandMessage)));
        return true;
      }
    } else {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleAppCommandMessage(), doesn't dispatch content "
         "command event", this));
    }
  }

  // Dispatch a keyup event if the command is caused by pressing a key and
  // the key isn't mapped to a virtual keycode.
  if (dispatchKeyEvent && !mVirtualKeyCode) {
    MOZ_ASSERT(!mWidget->Destroyed());
    nsresult rv = mDispatcher->BeginNativeInputTransaction();
    if (NS_WARN_IF(NS_FAILED(rv))) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
        ("%p   NativeKey::HandleAppCommandMessage(), FAILED due to "
         "BeginNativeInputTransaction() failure", this));
      return true;
    }
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleAppCommandMessage(), initializing keyup "
       "event...", this));
    WidgetKeyboardEvent keyupEvent(true, eKeyUp, mWidget);
    nsEventStatus status = InitKeyEvent(keyupEvent, mModKeyState, &mMsg);
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleAppCommandMessage(), dispatching keyup event...",
       this));
    // NOTE: Ignore if the keyup event is consumed because keyup event
    //       represents just a physical key event state change.
    mDispatcher->DispatchKeyboardEvent(eKeyUp, keyupEvent, status,
                                       const_cast<NativeKey*>(this));
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleAppCommandMessage(), dispatched keyup event",
       this));
    if (mWidget->Destroyed()) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleAppCommandMessage(), %s event caused "
         "destroying the widget", this));
      return true;
    }
  }

  return consumed;
}

bool
NativeKey::HandleKeyDownMessage(bool* aEventDispatched) const
{
  MOZ_ASSERT(IsKeyDownMessage());

  if (aEventDispatched) {
    *aEventDispatched = false;
  }

  if (sDispatchedKeyOfAppCommand &&
      sDispatchedKeyOfAppCommand == mOriginalVirtualKeyCode) {
    // The multimedia key event has already been dispatch from
    // HandleAppCommandMessage().
    sDispatchedKeyOfAppCommand = 0;
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), doesn't dispatch keydown "
       "event due to already dispatched from HandleAppCommandMessage(), ",
       this));
    if (RedirectedKeyDownMessageManager::IsRedirectedMessage(mMsg)) {
      RedirectedKeyDownMessageManager::Forget();
    }
    return true;
  }

  if (IsReservedBySystem()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), doesn't dispatch keydown "
       "event because the key combination is reserved by the system", this));
    if (RedirectedKeyDownMessageManager::IsRedirectedMessage(mMsg)) {
      RedirectedKeyDownMessageManager::Forget();
    }
    return false;
  }

  // If the widget has gone, we should do nothing.
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
      ("%p   NativeKey::HandleKeyDownMessage(), WARNING, not handled due to "
       "destroyed the widget", this));
    if (RedirectedKeyDownMessageManager::IsRedirectedMessage(mMsg)) {
      RedirectedKeyDownMessageManager::Forget();
    }
    return false;
  }

  bool defaultPrevented = false;
  if (mFakeCharMsgs || IsKeyMessageOnPlugin() ||
      !RedirectedKeyDownMessageManager::IsRedirectedMessage(mMsg)) {
    nsresult rv = mDispatcher->BeginNativeInputTransaction();
    if (NS_WARN_IF(NS_FAILED(rv))) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
        ("%p   NativeKey::HandleKeyDownMessage(), FAILED due to "
         "BeginNativeInputTransaction() failure", this));
      return true;
    }

    bool isIMEEnabled = WinUtils::IsIMEEnabled(mWidget->GetInputContext());

    MOZ_LOG(sNativeKeyLogger, LogLevel::Debug,
      ("%p   NativeKey::HandleKeyDownMessage(), initializing keydown "
       "event...", this));

    EventMessage keyDownMessage =
      IsKeyMessageOnPlugin() ? eKeyDownOnPlugin : eKeyDown;
    WidgetKeyboardEvent keydownEvent(true, keyDownMessage, mWidget);
    nsEventStatus status = InitKeyEvent(keydownEvent, mModKeyState, &mMsg);
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), dispatching keydown event...",
       this));
    bool dispatched =
      mDispatcher->DispatchKeyboardEvent(keyDownMessage, keydownEvent, status,
                                         const_cast<NativeKey*>(this));
    if (aEventDispatched) {
      *aEventDispatched = dispatched;
    }
    if (!dispatched) {
      // If the keydown event wasn't fired, there must be composition.
      // we don't need to do anything anymore.
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleKeyDownMessage(), doesn't dispatch keypress "
         "event(s) because keydown event isn't dispatched actually", this));
      return false;
    }
    defaultPrevented = status == nsEventStatus_eConsumeNoDefault;

    // We don't need to handle key messages on plugin for eKeyPress since
    // eKeyDownOnPlugin is handled as both eKeyDown and eKeyPress.
    if (IsKeyMessageOnPlugin()) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleKeyDownMessage(), doesn't dispatch keypress "
         "event(s) because it's a keydown message on windowed plugin, "
         "defaultPrevented=%s",
         this, GetBoolName(defaultPrevented)));
      return defaultPrevented;
    }

    if (mWidget->Destroyed() || IsFocusedWindowChanged()) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleKeyDownMessage(), keydown event caused "
         "destroying the widget", this));
      return true;
    }

    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), dispatched keydown event, "
       "dispatched=%s, defaultPrevented=%s",
       this, GetBoolName(dispatched), GetBoolName(defaultPrevented)));

    // If IMC wasn't associated to the window but is associated it now (i.e.,
    // focus is moved from a non-editable editor to an editor by keydown
    // event handler), WM_CHAR and WM_SYSCHAR shouldn't cause first character
    // inputting if IME is opened.  But then, we should redirect the native
    // keydown message to IME.
    // However, note that if focus has been already moved to another
    // application, we shouldn't redirect the message to it because the keydown
    // message is processed by us, so, nobody shouldn't process it.
    HWND focusedWnd = ::GetFocus();
    if (!defaultPrevented && !mFakeCharMsgs && !IsKeyMessageOnPlugin() &&
        focusedWnd && !mWidget->PluginHasFocus() && !isIMEEnabled &&
        WinUtils::IsIMEEnabled(mWidget->GetInputContext())) {
      RedirectedKeyDownMessageManager::RemoveNextCharMessage(focusedWnd);

      INPUT keyinput;
      keyinput.type = INPUT_KEYBOARD;
      keyinput.ki.wVk = mOriginalVirtualKeyCode;
      keyinput.ki.wScan = mScanCode;
      keyinput.ki.dwFlags = KEYEVENTF_SCANCODE;
      if (mIsExtended) {
        keyinput.ki.dwFlags |= KEYEVENTF_EXTENDEDKEY;
      }
      keyinput.ki.time = 0;
      keyinput.ki.dwExtraInfo = 0;

      RedirectedKeyDownMessageManager::WillRedirect(mMsg, defaultPrevented);

      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleKeyDownMessage(), redirecting %s...",
         this, ToString(mMsg).get()));

      ::SendInput(1, &keyinput, sizeof(keyinput));

      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::HandleKeyDownMessage(), redirected %s",
         this, ToString(mMsg).get()));

      // Return here.  We shouldn't dispatch keypress event for this WM_KEYDOWN.
      // If it's needed, it will be dispatched after next (redirected)
      // WM_KEYDOWN.
      return true;
    }
  } else {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), received a redirected %s",
       this, ToString(mMsg).get()));

    defaultPrevented = RedirectedKeyDownMessageManager::DefaultPrevented();
    // If this is redirected keydown message, we have dispatched the keydown
    // event already.
    if (aEventDispatched) {
      *aEventDispatched = true;
    }
  }

  RedirectedKeyDownMessageManager::Forget();

  MOZ_ASSERT(!mWidget->Destroyed());

  // If the key was processed by IME and didn't cause WM_(SYS)CHAR messages, we
  // shouldn't dispatch keypress event.
  if (mOriginalVirtualKeyCode == VK_PROCESSKEY &&
      !IsFollowedByPrintableCharOrSysCharMessage()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), not dispatching keypress "
       "event because the key was already handled by IME, defaultPrevented=%s",
       this, GetBoolName(defaultPrevented)));
    return defaultPrevented;
  }

  if (defaultPrevented) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), not dispatching keypress "
       "event because preceding keydown event was consumed",
       this));
    MaybeDispatchPluginEventsForRemovedCharMessages();
    return true;
  }

  MOZ_ASSERT(!mCharMessageHasGone,
             "If following char message was consumed by somebody, "
             "keydown event should have been consumed before dispatch");

  // If mCommittedCharsAndModifiers was initialized with following char
  // messages, we should dispatch keypress events with its information.
  if (IsFollowedByPrintableCharOrSysCharMessage()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), tries to be dispatching "
       "keypress events with retrieved char messages...", this));
    return DispatchKeyPressEventsWithRetrievedCharMessages();
  }

  // If we won't be getting a WM_CHAR, WM_SYSCHAR or WM_DEADCHAR, synthesize a
  // keypress for almost all keys
  if (NeedsToHandleWithoutFollowingCharMessages()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), tries to be dispatching "
       "keypress events...", this));
    return (MaybeDispatchPluginEventsForRemovedCharMessages() ||
            DispatchKeyPressEventsWithoutCharMessage());
  }

  // If WM_KEYDOWN of VK_PACKET isn't followed by WM_CHAR, we don't need to
  // dispatch keypress events.
  if (mVirtualKeyCode == VK_PACKET) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), not dispatching keypress event "
       "because the key is VK_PACKET and there are no char messages",
       this));
    return false;
  }

  if (!mModKeyState.IsControl() && !mModKeyState.IsAlt() &&
      !mModKeyState.IsWin() && mIsPrintableKey) {
    // If this is simple KeyDown event but next message is not WM_CHAR,
    // this event may not input text, so we should ignore this event.
    // See bug 314130.
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), not dispatching keypress event "
       "because the key event is simple printable key's event but not followed "
       "by char messages", this));
    return false;
  }

  if (mIsDeadKey) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyDownMessage(), not dispatching keypress event "
       "because the key is a dead key and not followed by char messages",
       this));
    return false;
  }

  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::HandleKeyDownMessage(), tries to be dispatching "
     "keypress events due to no following char messages...", this));
  return DispatchKeyPressEventsWithoutCharMessage();
}

bool
NativeKey::HandleCharMessage(bool* aEventDispatched) const
{
  MOZ_ASSERT(IsCharOrSysCharMessage(mMsg));
  return HandleCharMessage(mMsg, aEventDispatched);
}

bool
NativeKey::HandleCharMessage(const MSG& aCharMsg,
                             bool* aEventDispatched) const
{
  MOZ_ASSERT(IsKeyDownMessage() || IsCharOrSysCharMessage(mMsg));
  MOZ_ASSERT(IsCharOrSysCharMessage(aCharMsg.message));

  if (aEventDispatched) {
    *aEventDispatched = false;
  }

  if (IsCharOrSysCharMessage(mMsg) && IsAnotherInstanceRemovingCharMessage()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
      ("%p   NativeKey::HandleCharMessage(), WARNING, does nothing because "
       "the message should be handled in another instance removing this "
       "message", this));
    // Consume this for now because it will be handled by another instance.
    return true;
  }

  // If the key combinations is reserved by the system, we shouldn't dispatch
  // eKeyPress event for it and passes the message to next wndproc.
  if (IsReservedBySystem()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleCharMessage(), doesn't dispatch keypress "
       "event because the key combination is reserved by the system", this));
    return false;
  }

  // If the widget has gone, we should do nothing.
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
      ("%p   NativeKey::HandleCharMessage(), WARNING, not handled due to "
       "destroyed the widget", this));
    return false;
  }

  // When a control key is inputted by a key, it should be handled without
  // WM_*CHAR messages at receiving WM_*KEYDOWN message.  So, when we receive
  // WM_*CHAR message directly, we see a control character here.
  if (IsControlCharMessage(aCharMsg)) {
    // In this case, we don't need to dispatch eKeyPress event because:
    // 1. We're the only browser which dispatches "keypress" event for
    //    non-printable characters (Although, both Chrome and Edge dispatch
    //    "keypress" event for some keys accidentally.  For example, "IntlRo"
    //    key with Ctrl of Japanese keyboard layout).
    // 2. Currently, we may handle shortcut keys with "keydown" event if
    //    it's reserved or something.  So, we shouldn't dispatch "keypress"
    //    event without it.
    // Note that this does NOT mean we stop dispatching eKeyPress event for
    // key presses causes a control character when Ctrl is pressed.  In such
    // case, DispatchKeyPressEventsWithoutCharMessage() dispatches eKeyPress
    // instead of this method.
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleCharMessage(), doesn't dispatch keypress "
       "event because received a control character input without WM_KEYDOWN",
       this));
    return false;
  }

  // XXXmnakano I think that if mMsg is WM_CHAR, i.e., it comes without
  //            preceding WM_KEYDOWN, we should should dispatch composition
  //            events instead of eKeyPress because they are not caused by
  //            actual keyboard operation.

  // First, handle normal text input or non-printable key case here.
  WidgetKeyboardEvent keypressEvent(true, eKeyPress, mWidget);
  keypressEvent.mCharCode = static_cast<uint32_t>(aCharMsg.wParam);
  nsresult rv = mDispatcher->BeginNativeInputTransaction();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
      ("%p   NativeKey::HandleCharMessage(), FAILED due to "
       "BeginNativeInputTransaction() failure", this));
    return true;
  }

  MOZ_LOG(sNativeKeyLogger, LogLevel::Debug,
    ("%p   NativeKey::HandleCharMessage(), initializing keypress "
     "event...", this));

  ModifierKeyState modKeyState(mModKeyState);
  // When AltGr is pressed, both Alt and Ctrl are active.  However, when they
  // are active, EditorBase won't treat the keypress event as inputting a
  // character.  Therefore, when AltGr is pressed and the key tries to input
  // a character, let's set them to false.
  if (modKeyState.IsAltGr() && IsPrintableCharMessage(aCharMsg)) {
    modKeyState.Unset(MODIFIER_ALT | MODIFIER_CONTROL);
  }
  nsEventStatus status = InitKeyEvent(keypressEvent, modKeyState, &aCharMsg);
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::HandleCharMessage(), dispatching keypress event...",
     this));
  bool dispatched =
    mDispatcher->MaybeDispatchKeypressEvents(keypressEvent, status,
                                             const_cast<NativeKey*>(this));
  if (aEventDispatched) {
    *aEventDispatched = dispatched;
  }
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleCharMessage(), keypress event caused "
       "destroying the widget", this));
    return true;
  }
  bool consumed = status == nsEventStatus_eConsumeNoDefault;
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::HandleCharMessage(), dispatched keypress event, "
     "dispatched=%s, consumed=%s",
     this, GetBoolName(dispatched), GetBoolName(consumed)));
  return consumed;
}

bool
NativeKey::HandleKeyUpMessage(bool* aEventDispatched) const
{
  MOZ_ASSERT(IsKeyUpMessage());

  if (aEventDispatched) {
    *aEventDispatched = false;
  }

  // If the key combinations is reserved by the system, we shouldn't dispatch
  // eKeyUp event for it and passes the message to next wndproc.
  if (IsReservedBySystem()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyUpMessage(), doesn't dispatch keyup "
       "event because the key combination is reserved by the system", this));
    return false;
  }

  // If the widget has gone, we should do nothing.
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
      ("%p   NativeKey::HandleKeyUpMessage(), WARNING, not handled due to "
       "destroyed the widget", this));
    return false;
  }

  nsresult rv = mDispatcher->BeginNativeInputTransaction();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
      ("%p   NativeKey::HandleKeyUpMessage(), FAILED due to "
       "BeginNativeInputTransaction() failure", this));
    return true;
  }

  MOZ_LOG(sNativeKeyLogger, LogLevel::Debug,
    ("%p   NativeKey::HandleKeyUpMessage(), initializing keyup event...",
     this));
  EventMessage keyUpMessage = IsKeyMessageOnPlugin() ? eKeyUpOnPlugin : eKeyUp;
  WidgetKeyboardEvent keyupEvent(true, keyUpMessage, mWidget);
  nsEventStatus status = InitKeyEvent(keyupEvent, mModKeyState, &mMsg);
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::HandleKeyUpMessage(), dispatching keyup event...",
     this));
  bool dispatched =
    mDispatcher->DispatchKeyboardEvent(keyUpMessage, keyupEvent, status,
                                       const_cast<NativeKey*>(this));
  if (aEventDispatched) {
    *aEventDispatched = dispatched;
  }
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::HandleKeyUpMessage(), keyup event caused "
       "destroying the widget", this));
    return true;
  }
  bool consumed = status == nsEventStatus_eConsumeNoDefault;
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::HandleKeyUpMessage(), dispatched keyup event, "
     "dispatched=%s, consumed=%s",
     this, GetBoolName(dispatched), GetBoolName(consumed)));
  return consumed;
}

bool
NativeKey::NeedsToHandleWithoutFollowingCharMessages() const
{
  MOZ_ASSERT(IsKeyDownMessage());

  // We cannot know following char messages of key messages in a plugin
  // process.  So, let's compute the character to be inputted with every
  // printable key should be computed with the keyboard layout.
  if (IsKeyMessageOnPlugin()) {
    return true;
  }

  // If the key combination is reserved by the system, the caller shouldn't
  // do anything with following WM_*CHAR messages.  So, let's return true here.
  if (IsReservedBySystem()) {
    return true;
  }

  // If the keydown message is generated for inputting some Unicode characters
  // via SendInput() API, we need to handle it only with WM_*CHAR messages.
  if (mVirtualKeyCode == VK_PACKET) {
    return false;
  }

  // If following char message is for a control character, it should be handled
  // without WM_CHAR message.  This is typically Ctrl + [a-z].
  if (mFollowingCharMsgs.Length() == 1 &&
      IsControlCharMessage(mFollowingCharMsgs[0])) {
    return true;
  }

  // If keydown message is followed by WM_CHAR or WM_SYSCHAR whose wParam isn't
  // a control character, we should dispatch keypress event with the char
  // message even with any modifier state.
  if (IsFollowedByPrintableCharOrSysCharMessage()) {
    return false;
  }

  // If any modifier keys which may cause printable keys becoming non-printable
  // are not pressed, we don't need special handling for the key.
  if (!mModKeyState.IsControl() && !mModKeyState.IsAlt() &&
      !mModKeyState.IsWin()) {
    return false;
  }

  // If the key event causes dead key event, we don't need to dispatch keypress
  // event.
  if (mIsDeadKey && mCommittedCharsAndModifiers.IsEmpty()) {
    return false;
  }

  // Even if the key is a printable key, it might cause non-printable character
  // input with modifier key(s).
  return mIsPrintableKey;
}

bool
NativeKey::MayBeSameCharMessage(const MSG& aCharMsg1,
                                const MSG& aCharMsg2) const
{
  // NOTE: Although, we don't know when this case occurs, the scan code value
  //       in lParam may be changed from 0 to something.  The changed value
  //       is different from the scan code of handling keydown message.
  static const LPARAM kScanCodeMask = 0x00FF0000;
  return
    aCharMsg1.message == aCharMsg2.message &&
    aCharMsg1.wParam == aCharMsg2.wParam &&
    (aCharMsg1.lParam & ~kScanCodeMask) == (aCharMsg2.lParam & ~kScanCodeMask);
}

bool
NativeKey::IsSamePhysicalKeyMessage(const MSG& aKeyOrCharMsg1,
                                    const MSG& aKeyOrCharMsg2) const
{
  if (NS_WARN_IF(aKeyOrCharMsg1.message < WM_KEYFIRST) ||
      NS_WARN_IF(aKeyOrCharMsg1.message > WM_KEYLAST) ||
      NS_WARN_IF(aKeyOrCharMsg2.message < WM_KEYFIRST) ||
      NS_WARN_IF(aKeyOrCharMsg2.message > WM_KEYLAST)) {
    return false;
  }
  return WinUtils::GetScanCode(aKeyOrCharMsg1.lParam) ==
           WinUtils::GetScanCode(aKeyOrCharMsg2.lParam) &&
         WinUtils::IsExtendedScanCode(aKeyOrCharMsg1.lParam) ==
           WinUtils::IsExtendedScanCode(aKeyOrCharMsg2.lParam);
}

bool
NativeKey::GetFollowingCharMessage(MSG& aCharMsg)
{
  MOZ_ASSERT(IsKeyDownMessage());
  MOZ_ASSERT(!IsKeyMessageOnPlugin());

  aCharMsg.message = WM_NULL;

  if (mFakeCharMsgs) {
    for (size_t i = 0; i < mFakeCharMsgs->Length(); i++) {
      FakeCharMsg& fakeCharMsg = mFakeCharMsgs->ElementAt(i);
      if (fakeCharMsg.mConsumed) {
        continue;
      }
      MSG charMsg = fakeCharMsg.GetCharMsg(mMsg.hwnd);
      fakeCharMsg.mConsumed = true;
      if (!IsCharMessage(charMsg)) {
        return false;
      }
      aCharMsg = charMsg;
      return true;
    }
    return false;
  }

  // If next key message is not char message, we should give up to find a
  // related char message for the handling keydown event for now.
  // Note that it's possible other applications may send other key message
  // after we call TranslateMessage(). That may cause PeekMessage() failing
  // to get char message for the handling keydown message.
  MSG nextKeyMsg;
  if (!WinUtils::PeekMessage(&nextKeyMsg, mMsg.hwnd, WM_KEYFIRST, WM_KEYLAST,
                             PM_NOREMOVE | PM_NOYIELD) ||
      !IsCharMessage(nextKeyMsg)) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Verbose,
      ("%p   NativeKey::GetFollowingCharMessage(), there are no char messages",
       this));
    return false;
  }
  const MSG kFoundCharMsg = nextKeyMsg;

  AutoRestore<MSG> saveLastRemovingMsg(mRemovingMsg);
  mRemovingMsg = nextKeyMsg;

  mReceivedMsg = sEmptyMSG;
  AutoRestore<MSG> ensureToClearRecivedMsg(mReceivedMsg);

  // On Metrofox, PeekMessage() sometimes returns WM_NULL even if we specify
  // the message range.  So, if it returns WM_NULL, we should retry to get
  // the following char message it was found above.
  for (uint32_t i = 0; i < 50; i++) {
    MSG removedMsg, nextKeyMsgInAllWindows;
    bool doCrash = false;
    if (!WinUtils::PeekMessage(&removedMsg, mMsg.hwnd,
                               nextKeyMsg.message, nextKeyMsg.message,
                               PM_REMOVE | PM_NOYIELD)) {
      // We meets unexpected case.  We should collect the message queue state
      // and crash for reporting the bug.
      doCrash = true;

      // If another instance was created for the removing message during trying
      // to remove a char message, the instance didn't handle it for preventing
      // recursive handling.  So, let's handle it in this instance.
      if (!IsEmptyMSG(mReceivedMsg)) {
        // If focus is moved to different window, we shouldn't handle it on
        // the widget.  Let's discard it for now.
        if (mReceivedMsg.hwnd != nextKeyMsg.hwnd) {
          MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
            ("%p   NativeKey::GetFollowingCharMessage(), WARNING, received a "
             "char message during removing it from the queue, but it's for "
             "different window, mReceivedMsg=%s, nextKeyMsg=%s, "
             "kFoundCharMsg=%s",
             this, ToString(mReceivedMsg).get(), ToString(nextKeyMsg).get(),
             ToString(kFoundCharMsg).get()));
          // There might still exist char messages, the loop of calling
          // this method should be continued.
          aCharMsg.message = WM_NULL;
          return true;
        }
        // Even if the received message is different from what we tried to
        // remove from the queue, let's take the received message as a part of
        // the result of this key sequence.
        if (mReceivedMsg.message != nextKeyMsg.message ||
            mReceivedMsg.wParam != nextKeyMsg.wParam ||
            mReceivedMsg.lParam != nextKeyMsg.lParam) {
          MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
            ("%p   NativeKey::GetFollowingCharMessage(), WARNING, received a "
             "char message during removing it from the queue, but it's "
             "differnt from what trying to remove from the queue, "
             "aCharMsg=%s, nextKeyMsg=%s, kFoundCharMsg=%s",
             this, ToString(mReceivedMsg).get(), ToString(nextKeyMsg).get(),
             ToString(kFoundCharMsg).get()));
        } else {
          MOZ_LOG(sNativeKeyLogger, LogLevel::Verbose,
            ("%p   NativeKey::GetFollowingCharMessage(), succeeded to retrieve "
             "next char message via another instance, aCharMsg=%s, "
             "kFoundCharMsg=%s",
             this, ToString(mReceivedMsg).get(),
             ToString(kFoundCharMsg).get()));
        }
        aCharMsg = mReceivedMsg;
        return true;
      }

      // The char message is redirected to different thread's window by focus
      // move or something or just cancelled by external application.
      if (!WinUtils::PeekMessage(&nextKeyMsgInAllWindows, 0,
                                 WM_KEYFIRST, WM_KEYLAST,
                                 PM_NOREMOVE | PM_NOYIELD)) {
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message, but it's already gone from all message "
           "queues, nextKeyMsg=%s, kFoundCharMsg=%s",
           this, ToString(nextKeyMsg).get(), ToString(kFoundCharMsg).get()));
        return true; // XXX should return false in this case
      }
      // The next key message is redirected to different window created by our
      // thread, we should do nothing because we must not have focus.
      if (nextKeyMsgInAllWindows.hwnd != mMsg.hwnd) {
        aCharMsg = nextKeyMsgInAllWindows;
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message, but found in another message queue, "
           "nextKeyMsgInAllWindows=%s, nextKeyMsg=%s, kFoundCharMsg=%s",
           this, ToString(nextKeyMsgInAllWindows).get(),
           ToString(nextKeyMsg).get(), ToString(kFoundCharMsg).get()));
        return true;
      }
      // If next key message becomes non-char message, this key operation
      // may have already been consumed or canceled.
      if (!IsCharMessage(nextKeyMsgInAllWindows)) {
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message and next key message becomes non-char "
           "message, nextKeyMsgInAllWindows=%s, nextKeyMsg=%s, "
           "kFoundCharMsg=%s",
           this, ToString(nextKeyMsgInAllWindows).get(),
           ToString(nextKeyMsg).get(), ToString(kFoundCharMsg).get()));
        MOZ_ASSERT(!mCharMessageHasGone);
        mFollowingCharMsgs.Clear();
        mCharMessageHasGone = true;
        return false;
      }
      // If next key message is still a char message but different key message,
      // we should treat current key operation is consumed or canceled and
      // next char message should be handled as an orphan char message later.
      if (!IsSamePhysicalKeyMessage(nextKeyMsgInAllWindows, kFoundCharMsg)) {
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message and next key message becomes differnt key's "
           "char message, nextKeyMsgInAllWindows=%s, nextKeyMsg=%s, "
           "kFoundCharMsg=%s",
           this, ToString(nextKeyMsgInAllWindows).get(),
           ToString(nextKeyMsg).get(), ToString(kFoundCharMsg).get()));
        MOZ_ASSERT(!mCharMessageHasGone);
        mFollowingCharMsgs.Clear();
        mCharMessageHasGone = true;
        return false;
      }
      // If next key message is still a char message but the message is changed,
      // we should retry to remove the new message with PeekMessage() again.
      if (nextKeyMsgInAllWindows.message != nextKeyMsg.message) {
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message due to message change, let's retry to "
           "remove the message with newly found char message, ",
           "nextKeyMsgInAllWindows=%s, nextKeyMsg=%s, kFoundCharMsg=%s",
           this, ToString(nextKeyMsgInAllWindows).get(),
           ToString(nextKeyMsg).get(), ToString(kFoundCharMsg).get()));
        nextKeyMsg = nextKeyMsgInAllWindows;
        continue;
      }
      // If there is still existing a char message caused by same physical key
      // in the queue but PeekMessage(PM_REMOVE) failed to remove it from the
      // queue, it might be possible that the odd keyboard layout or utility
      // hooks only PeekMessage(PM_NOREMOVE) and GetMessage().  So, let's try
      // remove the char message with GetMessage() again.
      // FYI: The wParam might be different from the found message, but it's
      //      okay because we assume that odd keyboard layouts return actual
      //      inputting character at removing the char message.
      if (WinUtils::GetMessage(&removedMsg, mMsg.hwnd,
                               nextKeyMsg.message, nextKeyMsg.message)) {
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message, but succeeded with GetMessage(), "
           "removedMsg=%s, kFoundCharMsg=%s",
           this, ToString(removedMsg).get(), ToString(kFoundCharMsg).get()));
        // Cancel to crash, but we need to check the removed message value.
        doCrash = false;
      }
      // If we've already removed some WM_NULL messages from the queue and
      // the found message has already gone from the queue, let's treat the key
      // as inputting no characters and already consumed.
      else if (i > 0) {
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message, but removed %d WM_NULL messages",
           this, i));
        // If the key is a printable key or a control key but tried to input
        // a character, mark mCharMessageHasGone true for handling the keydown
        // event as inputting empty string.
        MOZ_ASSERT(!mCharMessageHasGone);
        mFollowingCharMsgs.Clear();
        mCharMessageHasGone = true;
        return false;
      }
      MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
        ("%p   NativeKey::GetFollowingCharMessage(), FAILED, lost target "
         "message to remove, nextKeyMsg=%s",
         this, ToString(nextKeyMsg).get()));
    }

    if (doCrash) {
      MOZ_CRASH("We lost the following char message");
    }

    // We're still not sure why ::PeekMessage() may return WM_NULL even with
    // its first message and its last message are same message.  However,
    // at developing Metrofox, we met this case even with usual keyboard
    // layouts.  So, it might be possible in desktop application or it really
    // occurs with some odd keyboard layouts which perhaps hook API.
    if (removedMsg.message == WM_NULL) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
        ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
         "remove a char message, instead, removed WM_NULL message, ",
         "removedMsg=%s",
         this, ToString(removedMsg).get()));
      // Check if there is the message which we're trying to remove.
      MSG newNextKeyMsg;
      if (!WinUtils::PeekMessage(&newNextKeyMsg, mMsg.hwnd,
                                 WM_KEYFIRST, WM_KEYLAST,
                                 PM_NOREMOVE | PM_NOYIELD)) {
        // If there is no key message, we should mark this keydown as consumed
        // because the key operation may have already been handled or canceled.
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message because it's gone during removing it from "
           "the queue, nextKeyMsg=%s, kFoundCharMsg=%s",
           this, ToString(nextKeyMsg).get(), ToString(kFoundCharMsg).get()));
        MOZ_ASSERT(!mCharMessageHasGone);
        mFollowingCharMsgs.Clear();
        mCharMessageHasGone = true;
        return false;
      }
      if (!IsCharMessage(newNextKeyMsg)) {
        // If next key message becomes a non-char message, we should mark this
        // keydown as consumed because the key operation may have already been
        // handled or canceled.
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::GetFollowingCharMessage(), WARNING, failed to "
           "remove a char message because it's gone during removing it from "
           "the queue, nextKeyMsg=%s, newNextKeyMsg=%s, kFoundCharMsg=%s",
           this, ToString(nextKeyMsg).get(), ToString(newNextKeyMsg).get(),
           ToString(kFoundCharMsg).get()));
        MOZ_ASSERT(!mCharMessageHasGone);
        mFollowingCharMsgs.Clear();
        mCharMessageHasGone = true;
        return false;
      }
      MOZ_LOG(sNativeKeyLogger, LogLevel::Debug,
        ("%p   NativeKey::GetFollowingCharMessage(), there is the message "
         "which is being tried to be removed from the queue, trying again...",
         this));
      continue;
    }

    // Typically, this case occurs with WM_DEADCHAR.  If the removed message's
    // wParam becomes 0, that means that the key event shouldn't cause text
    // input.  So, let's ignore the strange char message.
    if (removedMsg.message == nextKeyMsg.message && !removedMsg.wParam) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
        ("%p   NativeKey::GetFollowingCharMessage(), WARNING, succeeded to "
         "remove a char message, but the removed message's wParam is 0, "
         "removedMsg=%s",
         this, ToString(removedMsg).get()));
      return false;
    }

    // This is normal case.
    if (MayBeSameCharMessage(removedMsg, nextKeyMsg)) {
      aCharMsg = removedMsg;
      MOZ_LOG(sNativeKeyLogger, LogLevel::Verbose,
        ("%p   NativeKey::GetFollowingCharMessage(), succeeded to retrieve "
         "next char message, aCharMsg=%s",
         this, ToString(aCharMsg).get()));
      return true;
    }

    // Even if removed message is different char message from the found char
    // message, when the scan code is same, we can assume that the message
    // is overwritten by somebody who hooks API.  See bug 1336028 comment 0 for
    // the possible scenarios.
    if (IsCharMessage(removedMsg) &&
        IsSamePhysicalKeyMessage(removedMsg, nextKeyMsg)) {
      aCharMsg = removedMsg;
      MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
        ("%p   NativeKey::GetFollowingCharMessage(), WARNING, succeeded to "
         "remove a char message, but the removed message was changed from "
         "the found message except their scancode, aCharMsg=%s, "
         "nextKeyMsg=%s, kFoundCharMsg=%s",
         this, ToString(aCharMsg).get(), ToString(nextKeyMsg).get(),
         ToString(kFoundCharMsg).get()));
      return true;
    }

    // When found message's wParam is 0 and its scancode is 0xFF, we may remove
    // usual char message actually.  In such case, we should use the removed
    // char message.
    if (IsCharMessage(removedMsg) && !nextKeyMsg.wParam &&
        WinUtils::GetScanCode(nextKeyMsg.lParam) == 0xFF) {
      aCharMsg = removedMsg;
      MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
        ("%p   NativeKey::GetFollowingCharMessage(), WARNING, succeeded to "
         "remove a char message, but the removed message was changed from "
         "the found message but the found message was odd, so, ignoring the "
         "odd found message and respecting the removed message, aCharMsg=%s, "
         "nextKeyMsg=%s, kFoundCharMsg=%s",
         this, ToString(aCharMsg).get(), ToString(nextKeyMsg).get(),
         ToString(kFoundCharMsg).get()));
      return true;
    }

    // NOTE: Although, we don't know when this case occurs, the scan code value
    //       in lParam may be changed from 0 to something.  The changed value
    //       is different from the scan code of handling keydown message.
    MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
      ("%p   NativeKey::GetFollowingCharMessage(), FAILED, removed message "
       "is really different from what we have already found, removedMsg=%s, "
       "nextKeyMsg=%s, kFoundCharMsg=%s",
       this, ToString(removedMsg).get(), ToString(nextKeyMsg).get(),
       ToString(kFoundCharMsg).get()));
    MOZ_CRASH("PeekMessage() removed unexpected message");
  }
  MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
    ("%p   NativeKey::GetFollowingCharMessage(), FAILED, removed messages "
     "are all WM_NULL, nextKeyMsg=%s",
     this, ToString(nextKeyMsg).get()));
  MOZ_CRASH("We lost the following char message");
  return false;
}

bool
NativeKey::MaybeDispatchPluginEventsForRemovedCharMessages() const
{
  MOZ_ASSERT(IsKeyDownMessage());
  MOZ_ASSERT(!IsKeyMessageOnPlugin());

  for (size_t i = 0;
       i < mFollowingCharMsgs.Length() && mWidget->ShouldDispatchPluginEvent();
       ++i) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::MaybeDispatchPluginEventsForRemovedCharMessages(), "
       "dispatching %uth plugin event for %s...",
       this, i + 1, ToString(mFollowingCharMsgs[i]).get()));
    MOZ_RELEASE_ASSERT(!mWidget->Destroyed(),
      "NativeKey tries to dispatch a plugin event on destroyed widget");
    mWidget->DispatchPluginEvent(mFollowingCharMsgs[i]);
    if (mWidget->Destroyed() || IsFocusedWindowChanged()) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::MaybeDispatchPluginEventsForRemovedCharMessages(), "
         "%uth plugin event caused %s",
         this, i + 1, mWidget->Destroyed() ? "destroying the widget" :
                                             "focus change"));
      return true;
    }
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::MaybeDispatchPluginEventsForRemovedCharMessages(), "
       "dispatched %uth plugin event",
       this, i + 1));
  }

  // Dispatch odd char messages which are caused by ATOK or WXG (both of them
  // are Japanese IME) and removed by RemoveFollowingOddCharMessages().
  for (size_t i = 0;
       i < mRemovedOddCharMsgs.Length() && mWidget->ShouldDispatchPluginEvent();
       ++i) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::MaybeDispatchPluginEventsForRemovedCharMessages(), "
       "dispatching %uth plugin event for odd char message, %s...",
       this, i + 1, ToString(mFollowingCharMsgs[i]).get()));
    MOZ_RELEASE_ASSERT(!mWidget->Destroyed(),
      "NativeKey tries to dispatch a plugin event on destroyed widget");
    mWidget->DispatchPluginEvent(mRemovedOddCharMsgs[i]);
    if (mWidget->Destroyed() || IsFocusedWindowChanged()) {
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::MaybeDispatchPluginEventsForRemovedCharMessages(), "
         "%uth plugin event for odd char message caused %s",
         this, i + 1, mWidget->Destroyed() ? "destroying the widget" :
                                             "focus change"));
      return true;
    }
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::MaybeDispatchPluginEventsForRemovedCharMessages(), "
       "dispatched %uth plugin event for odd char message",
       this, i + 1));
  }

  return false;
}

void
NativeKey::ComputeInputtingStringWithKeyboardLayout()
{
  KeyboardLayout* keyboardLayout = KeyboardLayout::GetInstance();

  if (KeyboardLayout::IsPrintableCharKey(mVirtualKeyCode) ||
      mCharMessageHasGone) {
    mInputtingStringAndModifiers = mCommittedCharsAndModifiers;
  } else {
    mInputtingStringAndModifiers.Clear();
  }
  mShiftedString.Clear();
  mUnshiftedString.Clear();
  mShiftedLatinChar = mUnshiftedLatinChar = 0;

  // XXX How about when Win key is pressed?
  if (mModKeyState.IsControl() == mModKeyState.IsAlt()) {
    return;
  }

  ModifierKeyState capsLockState(
                     mModKeyState.GetModifiers() & MODIFIER_CAPSLOCK);

  mUnshiftedString =
    keyboardLayout->GetUniCharsAndModifiers(mVirtualKeyCode, capsLockState);
  capsLockState.Set(MODIFIER_SHIFT);
  mShiftedString =
    keyboardLayout->GetUniCharsAndModifiers(mVirtualKeyCode, capsLockState);

  // The current keyboard cannot input alphabets or numerics,
  // we should append them for Shortcut/Access keys.
  // E.g., for Cyrillic keyboard layout.
  capsLockState.Unset(MODIFIER_SHIFT);
  WidgetUtils::GetLatinCharCodeForKeyCode(mDOMKeyCode,
                                          capsLockState.GetModifiers(),
                                          &mUnshiftedLatinChar,
                                          &mShiftedLatinChar);

  // If the mShiftedLatinChar isn't 0, the key code is NS_VK_[A-Z].
  if (mShiftedLatinChar) {
    // If the produced characters of the key on current keyboard layout
    // are same as computed Latin characters, we shouldn't append the
    // Latin characters to alternativeCharCode.
    if (mUnshiftedLatinChar == mUnshiftedString.CharAt(0) &&
        mShiftedLatinChar == mShiftedString.CharAt(0)) {
      mShiftedLatinChar = mUnshiftedLatinChar = 0;
    }
  } else if (mUnshiftedLatinChar) {
    // If the mShiftedLatinChar is 0, the mKeyCode doesn't produce
    // alphabet character.  At that time, the character may be produced
    // with Shift key.  E.g., on French keyboard layout, NS_VK_PERCENT
    // key produces LATIN SMALL LETTER U WITH GRAVE (U+00F9) without
    // Shift key but with Shift key, it produces '%'.
    // If the mUnshiftedLatinChar is produced by the key on current
    // keyboard layout, we shouldn't append it to alternativeCharCode.
    if (mUnshiftedLatinChar == mUnshiftedString.CharAt(0) ||
        mUnshiftedLatinChar == mShiftedString.CharAt(0)) {
      mUnshiftedLatinChar = 0;
    }
  }

  if (!mModKeyState.IsControl()) {
    return;
  }

  // If the mCharCode is not ASCII character, we should replace the
  // mCharCode with ASCII character only when Ctrl is pressed.
  // But don't replace the mCharCode when the mCharCode is not same as
  // unmodified characters. In such case, Ctrl is sometimes used for a
  // part of character inputting key combination like Shift.
  uint32_t ch =
    mModKeyState.IsShift() ? mShiftedLatinChar : mUnshiftedLatinChar;
  if (!ch) {
    return;
  }
  if (mInputtingStringAndModifiers.IsEmpty() ||
      mInputtingStringAndModifiers.UniCharsCaseInsensitiveEqual(
        mModKeyState.IsShift() ? mShiftedString : mUnshiftedString)) {
    mInputtingStringAndModifiers.Clear();
    mInputtingStringAndModifiers.Append(ch, mModKeyState.GetModifiers());
  }
}

bool
NativeKey::DispatchKeyPressEventsWithRetrievedCharMessages() const
{
  MOZ_ASSERT(IsKeyDownMessage());
  MOZ_ASSERT(IsFollowedByPrintableCharOrSysCharMessage());
  MOZ_ASSERT(!mWidget->Destroyed());

  nsresult rv = mDispatcher->BeginNativeInputTransaction();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
      ("%p   NativeKey::DispatchKeyPressEventsWithRetrievedCharMessages(), "
       "FAILED due to BeginNativeInputTransaction() failure", this));
    return true;
  }
  WidgetKeyboardEvent keypressEvent(true, eKeyPress, mWidget);
  MOZ_LOG(sNativeKeyLogger, LogLevel::Debug,
    ("%p   NativeKey::DispatchKeyPressEventsWithRetrievedCharMessages(), "
     "initializing keypress event...", this));
  ModifierKeyState modKeyState(mModKeyState);
  if (mCanIgnoreModifierStateAtKeyPress && IsFollowedByPrintableCharMessage()) {
    // If eKeyPress event should cause inputting text in focused editor,
    // we need to remove Alt and Ctrl state.
    modKeyState.Unset(MODIFIER_ALT | MODIFIER_CONTROL);
  }
  // We don't need to send char message here if there are two or more retrieved
  // messages because we need to set each message to each eKeyPress event.
  bool needsCallback = mFollowingCharMsgs.Length() > 1;
  nsEventStatus status =
    InitKeyEvent(keypressEvent, modKeyState,
                 !needsCallback ? &mFollowingCharMsgs[0] : nullptr);
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::DispatchKeyPressEventsWithRetrievedCharMessages(), "
     "dispatching keypress event(s)...", this));
  bool dispatched =
    mDispatcher->MaybeDispatchKeypressEvents(keypressEvent, status,
                                             const_cast<NativeKey*>(this),
                                             needsCallback);
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::DispatchKeyPressEventsWithRetrievedCharMessages(), "
       "keypress event(s) caused destroying the widget", this));
    return true;
  }
  bool consumed = status == nsEventStatus_eConsumeNoDefault;
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::DispatchKeyPressEventsWithRetrievedCharMessages(), "
     "dispatched keypress event(s), dispatched=%s, consumed=%s",
     this, GetBoolName(dispatched), GetBoolName(consumed)));
  return consumed;
}

bool
NativeKey::DispatchKeyPressEventsWithoutCharMessage() const
{
  MOZ_ASSERT(IsKeyDownMessage());
  MOZ_ASSERT(!mIsDeadKey || !mCommittedCharsAndModifiers.IsEmpty());
  MOZ_ASSERT(!mWidget->Destroyed());

  nsresult rv = mDispatcher->BeginNativeInputTransaction();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Error,
      ("%p   NativeKey::DispatchKeyPressEventsWithoutCharMessage(), FAILED due "
       "to BeginNativeInputTransaction() failure", this));
    return true;
  }

  WidgetKeyboardEvent keypressEvent(true, eKeyPress, mWidget);
  if (mInputtingStringAndModifiers.IsEmpty() &&
      mShiftedString.IsEmpty() && mUnshiftedString.IsEmpty()) {
    keypressEvent.mKeyCode = mDOMKeyCode;
  }
  MOZ_LOG(sNativeKeyLogger, LogLevel::Debug,
    ("%p   NativeKey::DispatchKeyPressEventsWithoutCharMessage(), initializing "
     "keypress event...", this));
  nsEventStatus status = InitKeyEvent(keypressEvent, mModKeyState);
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::DispatchKeyPressEventsWithoutCharMessage(), dispatching "
     "keypress event(s)...", this));
  bool dispatched =
    mDispatcher->MaybeDispatchKeypressEvents(keypressEvent, status,
                                             const_cast<NativeKey*>(this));
  if (mWidget->Destroyed()) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::DispatchKeyPressEventsWithoutCharMessage(), "
       "keypress event(s) caused destroying the widget", this));
    return true;
  }
  bool consumed = status == nsEventStatus_eConsumeNoDefault;
  MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
    ("%p   NativeKey::DispatchKeyPressEventsWithoutCharMessage(), dispatched "
     "keypress event(s), dispatched=%s, consumed=%s",
     this, GetBoolName(dispatched), GetBoolName(consumed)));
  return consumed;
}

void
NativeKey::WillDispatchKeyboardEvent(WidgetKeyboardEvent& aKeyboardEvent,
                                     uint32_t aIndex)
{
  // If it's an eKeyPress event and it's generated from retrieved char message,
  // we need to set raw message information for plugins.
  if (aKeyboardEvent.mMessage == eKeyPress &&
      IsFollowedByPrintableCharOrSysCharMessage()) {
    MOZ_RELEASE_ASSERT(aIndex < mCommittedCharsAndModifiers.Length());
    uint32_t foundPrintableCharMessages = 0;
    for (size_t i = 0; i < mFollowingCharMsgs.Length(); ++i) {
      if (!IsPrintableCharOrSysCharMessage(mFollowingCharMsgs[i])) {
        // XXX Should we dispatch a plugin event for WM_*DEADCHAR messages and
        //     WM_CHAR with a control character here?  But we're not sure
        //     how can we create such message queue (i.e., WM_CHAR or
        //     WM_SYSCHAR with a printable character and such message are
        //     generated by a keydown).  So, let's ignore such case until
        //     we'd get some bug reports.
        MOZ_LOG(sNativeKeyLogger, LogLevel::Warning,
          ("%p   NativeKey::WillDispatchKeyboardEvent(), WARNING, "
           "ignoring %uth message due to non-printable char message, %s",
           this, i + 1, ToString(mFollowingCharMsgs[i]).get()));
        continue;
      }
      if (foundPrintableCharMessages++ == aIndex) {
        // Found message which caused the eKeyPress event.  Let's set the
        // message for plugin if it's necessary.
        MaybeInitPluginEventOfKeyEvent(aKeyboardEvent, mFollowingCharMsgs[i]);
        break;
      }
    }
    // Set modifier state from mCommittedCharsAndModifiers because some of them
    // might be different.  For example, Shift key was pressed at inputting
    // dead char but Shift key was released before inputting next character.
    if (mCanIgnoreModifierStateAtKeyPress) {
      ModifierKeyState modKeyState(mModKeyState);
      modKeyState.Unset(MODIFIER_SHIFT | MODIFIER_CONTROL | MODIFIER_ALT |
                        MODIFIER_ALTGRAPH | MODIFIER_CAPSLOCK);
      modKeyState.Set(mCommittedCharsAndModifiers.ModifiersAt(aIndex));
      modKeyState.InitInputEvent(aKeyboardEvent);
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::WillDispatchKeyboardEvent(), "
         "setting %uth modifier state to %s",
         this, aIndex + 1, ToString(modKeyState).get()));
    }
  }
  size_t longestLength =
    std::max(mInputtingStringAndModifiers.Length(),
             std::max(mShiftedString.Length(), mUnshiftedString.Length()));
  size_t skipUniChars = longestLength - mInputtingStringAndModifiers.Length();
  size_t skipShiftedChars = longestLength - mShiftedString.Length();
  size_t skipUnshiftedChars = longestLength - mUnshiftedString.Length();
  if (aIndex >= longestLength) {
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::WillDispatchKeyboardEvent(), does nothing for %uth "
       "%s event",
       this, aIndex + 1, ToChar(aKeyboardEvent.mMessage)));
    return;
  }

  // Check if aKeyboardEvent is the last event for a key press.
  // So, if it's not an eKeyPress event, it's always the last event.
  // Otherwise, check if the index is the last character of
  // mCommittedCharsAndModifiers.
  bool isLastIndex =
    aKeyboardEvent.mMessage != eKeyPress ||
    mCommittedCharsAndModifiers.IsEmpty() ||
    mCommittedCharsAndModifiers.Length() - 1 == aIndex;

  nsTArray<AlternativeCharCode>& altArray =
    aKeyboardEvent.mAlternativeCharCodes;

  // Set charCode and adjust modifier state for every eKeyPress event.
  // This is not necessary for the other keyboard events because the other
  // keyboard events shouldn't have non-zero charCode value and should have
  // current modifier state.
  if (aKeyboardEvent.mMessage == eKeyPress && skipUniChars <= aIndex) {
    // XXX Modifying modifier state of aKeyboardEvent is illegal, but no way
    //     to set different modifier state per keypress event except this
    //     hack.  Note that ideally, dead key should cause composition events
    //     instead of keypress events, though.
    if (aIndex - skipUniChars  < mInputtingStringAndModifiers.Length()) {
      ModifierKeyState modKeyState(mModKeyState);
      // If key in combination with Alt and/or Ctrl produces a different
      // character than without them then do not report these flags
      // because it is separate keyboard layout shift state. If dead-key
      // and base character does not produce a valid composite character
      // then both produced dead-key character and following base
      // character may have different modifier flags, too.
      modKeyState.Unset(MODIFIER_SHIFT | MODIFIER_CONTROL | MODIFIER_ALT |
                        MODIFIER_ALTGRAPH | MODIFIER_CAPSLOCK);
      modKeyState.Set(
        mInputtingStringAndModifiers.ModifiersAt(aIndex - skipUniChars));
      modKeyState.InitInputEvent(aKeyboardEvent);
      MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
        ("%p   NativeKey::WillDispatchKeyboardEvent(), "
         "setting %uth modifier state to %s",
         this, aIndex + 1, ToString(modKeyState).get()));
    }
    uint16_t uniChar =
      mInputtingStringAndModifiers.CharAt(aIndex - skipUniChars);

    // The mCharCode was set from mKeyValue. However, for example, when Ctrl key
    // is pressed, its value should indicate an ASCII character for backward
    // compatibility rather than inputting character without the modifiers.
    // Therefore, we need to modify mCharCode value here.
    aKeyboardEvent.SetCharCode(uniChar);
    MOZ_LOG(sNativeKeyLogger, LogLevel::Info,
      ("%p   NativeKey::WillDispatchKeyboardEvent(), "
       "setting %uth charCode to %s",
       this, aIndex + 1, GetCharacterCodeName(uniChar).get()));
  }

  // We need to append alterntaive charCode values:
  //   - if the event is eKeyPress, we need to append for the index because
  //     eKeyPress event is dispatched for every character inputted by a
  //     key press.
  //   - if the event is not eKeyPress, we need to append for all characters
  //     inputted by the key press because the other keyboard events (e.g.,
  //     eKeyDown are eKeyUp) are fired only once for a key press.
  size_t count;
  if (aKeyboardEvent.mMessage == eKeyPress) {
    // Basically, append alternative charCode values only for the index.
    count = 1;
    // However, if it's the last eKeyPress event but different shift state
    // can input longer string, the last eKeyPress event should have all
    // remaining alternative charCode values.
    if (isLastIndex) {
      count = longestLength - aIndex;
    }
  } else {
    count = longestLength;
  }
  for (size_t i = 0; i < count; ++i) {
    uint16_t shiftedChar = 0, unshiftedChar = 0;
    if (skipShiftedChars <= aIndex + i) {
      shiftedChar = mShiftedString.CharAt(aIndex + i - skipShiftedChars);
    }
    if (skipUnshiftedChars <= aIndex + i) {
      unshiftedChar = mUnshiftedString.CharAt(aIndex + i - skipUnshiftedChars);
    }

    if (shiftedChar || unshiftedChar) {
      AlternativeCharCode chars(unshiftedChar, shiftedChar);
      altArray.AppendElement(chars);
    }

    if (!isLastIndex) {
      continue;
    }

    if (mUnshiftedLatinChar || mShiftedLatinChar) {
      AlternativeCharCode chars(mUnshiftedLatinChar, mShiftedLatinChar);
      altArray.AppendElement(chars);
    }

    // Typically, following virtual keycodes are used for a key which can
    // input the character.  However, these keycodes are also used for
    // other keys on some keyboard layout.  E.g., in spite of Shift+'1'
    // inputs '+' on Thai keyboard layout, a key which is at '=/+'
    // key on ANSI keyboard layout is VK_OEM_PLUS.  Native applications
    // handle it as '+' key if Ctrl key is pressed.
    char16_t charForOEMKeyCode = 0;
    switch (mVirtualKeyCode) {
      case VK_OEM_PLUS:   charForOEMKeyCode = '+'; break;
      case VK_OEM_COMMA:  charForOEMKeyCode = ','; break;
      case VK_OEM_MINUS:  charForOEMKeyCode = '-'; break;
      case VK_OEM_PERIOD: charForOEMKeyCode = '.'; break;
    }
    if (charForOEMKeyCode &&
        charForOEMKeyCode != mUnshiftedString.CharAt(0) &&
        charForOEMKeyCode != mShiftedString.CharAt(0) &&
        charForOEMKeyCode != mUnshiftedLatinChar &&
        charForOEMKeyCode != mShiftedLatinChar) {
      AlternativeCharCode OEMChars(charForOEMKeyCode, charForOEMKeyCode);
      altArray.AppendElement(OEMChars);
    }
  }
}

/*****************************************************************************
 * mozilla::widget::KeyboardLayout
 *****************************************************************************/

KeyboardLayout* KeyboardLayout::sInstance = nullptr;
nsIIdleServiceInternal* KeyboardLayout::sIdleService = nullptr;

// This log is very noisy if you don't want to retrieve the mapping table
// of specific keyboard layout.  LogLevel::Debug and LogLevel::Verbose are
// used to log the layout mapping.  If you need to log some behavior of
// KeyboardLayout class, you should use LogLevel::Info or lower level.
LazyLogModule sKeyboardLayoutLogger("KeyboardLayoutWidgets");

// static
KeyboardLayout*
KeyboardLayout::GetInstance()
{
  if (!sInstance) {
    sInstance = new KeyboardLayout();
    nsCOMPtr<nsIIdleServiceInternal> idleService =
      do_GetService("@mozilla.org/widget/idleservice;1");
    // The refcount will be decreased at shut down.
    sIdleService = idleService.forget().take();
  }
  return sInstance;
}

// static
void
KeyboardLayout::Shutdown()
{
  delete sInstance;
  sInstance = nullptr;
  NS_IF_RELEASE(sIdleService);
}

// static
void
KeyboardLayout::NotifyIdleServiceOfUserActivity()
{
  sIdleService->ResetIdleTimeOut(0);
}

KeyboardLayout::KeyboardLayout()
  : mKeyboardLayout(0)
  , mIsOverridden(false)
  , mIsPendingToRestoreKeyboardLayout(false)
{
  mDeadKeyTableListHead = nullptr;
  // A dead key sequence should be made from up to 5 keys.  Therefore, 4 is
  // enough and makes sense because the item is uint8_t.
  // (Although, even if it's possible to be 6 keys or more in a sequence,
  // this array will be re-allocated).
  mActiveDeadKeys.SetCapacity(4);
  mDeadKeyShiftStates.SetCapacity(4);

  // NOTE: LoadLayout() should be called via OnLayoutChange().
}

KeyboardLayout::~KeyboardLayout()
{
  ReleaseDeadKeyTables();
}

bool
KeyboardLayout::IsPrintableCharKey(uint8_t aVirtualKey)
{
  return GetKeyIndex(aVirtualKey) >= 0;
}

WORD
KeyboardLayout::ComputeScanCodeForVirtualKeyCode(uint8_t aVirtualKeyCode) const
{
  return static_cast<WORD>(
           ::MapVirtualKeyEx(aVirtualKeyCode, MAPVK_VK_TO_VSC, GetLayout()));
}

bool
KeyboardLayout::IsDeadKey(uint8_t aVirtualKey,
                          const ModifierKeyState& aModKeyState) const
{
  int32_t virtualKeyIndex = GetKeyIndex(aVirtualKey);

  // XXX KeyboardLayout class doesn't support unusual keyboard layout which
  //     maps some function keys as dead keys.
  if (virtualKeyIndex < 0) {
    return false;
  }

  return mVirtualKeys[virtualKeyIndex].IsDeadKey(
           VirtualKey::ModifiersToShiftState(aModKeyState.GetModifiers()));
}

bool
KeyboardLayout::IsSysKey(uint8_t aVirtualKey,
                         const ModifierKeyState& aModKeyState) const
{
  // If Alt key is not pressed, it's never a system key combination.
  // Additionally, if Ctrl key is pressed, it's never a system key combination
  // too.
  // FYI: Windows logo key state won't affect if it's a system key.
  if (!aModKeyState.IsAlt() || aModKeyState.IsControl()) {
    return false;
  }

  int32_t virtualKeyIndex = GetKeyIndex(aVirtualKey);
  if (virtualKeyIndex < 0) {
    return true;
  }

  UniCharsAndModifiers inputCharsAndModifiers =
    GetUniCharsAndModifiers(aVirtualKey, aModKeyState);
  if (inputCharsAndModifiers.IsEmpty()) {
    return true;
  }

  // If the Alt key state isn't consumed, that means that the key with Alt
  // doesn't cause text input.  So, the combination is a system key.
  return !!(inputCharsAndModifiers.ModifiersAt(0) & MODIFIER_ALT);
}

void
KeyboardLayout::InitNativeKey(NativeKey& aNativeKey,
                              const ModifierKeyState& aModKeyState)
{
  if (mIsPendingToRestoreKeyboardLayout) {
    LoadLayout(::GetKeyboardLayout(0));
  }

  // If the aNativeKey is initialized with WM_CHAR, the key information
  // should be discarded because mKeyValue should have the string to be
  // inputted.
  if (aNativeKey.mMsg.message == WM_CHAR) {
    char16_t ch = static_cast<char16_t>(aNativeKey.mMsg.wParam);
    // But don't set key value as printable key if the character is a control
    // character such as 0x0D at pressing Enter key.
    if (!NativeKey::IsControlChar(ch)) {
      aNativeKey.mKeyNameIndex = KEY_NAME_INDEX_USE_STRING;
      Modifiers modifiers =
        aModKeyState.GetModifiers() & ~(MODIFIER_ALT | MODIFIER_CONTROL);
      aNativeKey.mCommittedCharsAndModifiers.Append(ch, modifiers);
      return;
    }
  }

  // When it's followed by non-dead char message(s) for printable character(s),
  // aNativeKey should dispatch eKeyPress events for them rather than
  // information from keyboard layout because respecting WM_(SYS)CHAR messages
  // guarantees that we can always input characters which is expected by
  // the user even if the user uses odd keyboard layout.
  // Or, when it was followed by non-dead char message for a printable character
  // but it's gone at removing the message from the queue, let's treat it
  // as a key inputting empty string.
  if (aNativeKey.IsFollowedByPrintableCharOrSysCharMessage() ||
      aNativeKey.mCharMessageHasGone) {
    MOZ_ASSERT(!aNativeKey.IsCharMessage(aNativeKey.mMsg));
    if (aNativeKey.IsFollowedByPrintableCharOrSysCharMessage()) {
      // Initialize mCommittedCharsAndModifiers with following char messages.
      aNativeKey.
        InitCommittedCharsAndModifiersWithFollowingCharMessages(aModKeyState);
      MOZ_ASSERT(!aNativeKey.mCommittedCharsAndModifiers.IsEmpty());

      // Currently, we are doing a ugly hack to keypress events to cause
      // inputting character even if Ctrl or Alt key is pressed, that is, we
      // remove Ctrl and Alt modifier state from keypress event.  However, for
      // example, Ctrl+Space which causes ' ' of WM_CHAR message never causes
      // keypress event whose ctrlKey is true.  For preventing this problem,
      // we should mark as not removable if Ctrl or Alt key does not cause
      // changing inputting character.
      if (IsPrintableCharKey(aNativeKey.mOriginalVirtualKeyCode) &&
          !aModKeyState.IsAltGr() &&
          (aModKeyState.IsControl() || aModKeyState.IsAlt())) {
        ModifierKeyState state = aModKeyState;
        state.Unset(MODIFIER_ALT | MODIFIER_CONTROL);
        UniCharsAndModifiers charsWithoutModifier =
          GetUniCharsAndModifiers(aNativeKey.mOriginalVirtualKeyCode, state);
        aNativeKey.mCanIgnoreModifierStateAtKeyPress =
          !charsWithoutModifier.UniCharsEqual(
                                  aNativeKey.mCommittedCharsAndModifiers);
      }
    } else {
      aNativeKey.mCommittedCharsAndModifiers.Clear();
    }
    aNativeKey.mKeyNameIndex = KEY_NAME_INDEX_USE_STRING;

    // If it's not in dead key sequence, we don't need to do anymore here.
    if (!IsInDeadKeySequence()) {
      return;
    }

    // If it's in dead key sequence and dead char is inputted as is, we need to
    // set the previous modifier state which is stored when preceding dead key
    // is pressed.
    UniCharsAndModifiers deadChars = GetDeadUniCharsAndModifiers();
    aNativeKey.mCommittedCharsAndModifiers.
                 OverwriteModifiersIfBeginsWith(deadChars);
    // Finish the dead key sequence.
    DeactivateDeadKeyState();
    return;
  }

  // If it's a dead key, aNativeKey will be initialized by
  // MaybeInitNativeKeyAsDeadKey().
  if (MaybeInitNativeKeyAsDeadKey(aNativeKey, aModKeyState)) {
    return;
  }

  // If the key is not a usual printable key, KeyboardLayout class assume that
  // it's not cause dead char nor printable char.  Therefore, there are nothing
  // to do here fore such keys (e.g., function keys).
  // However, this should keep dead key state even if non-printable key is
  // pressed during a dead key sequence.
  if (!IsPrintableCharKey(aNativeKey.mOriginalVirtualKeyCode)) {
    return;
  }

  MOZ_ASSERT(aNativeKey.mOriginalVirtualKeyCode != VK_PACKET,
    "At handling VK_PACKET, we shouldn't refer keyboard layout");
  MOZ_ASSERT(aNativeKey.mKeyNameIndex == KEY_NAME_INDEX_USE_STRING,
    "Printable key's key name index must be KEY_NAME_INDEX_USE_STRING");

  // If it's in dead key handling and the pressed key causes a composite
  // character, aNativeKey will be initialized by
  // MaybeInitNativeKeyWithCompositeChar().
  if (MaybeInitNativeKeyWithCompositeChar(aNativeKey, aModKeyState)) {
    return;
  }

  UniCharsAndModifiers baseChars =
    GetUniCharsAndModifiers(aNativeKey.mOriginalVirtualKeyCode, aModKeyState);

  // If the key press isn't related to any dead keys, initialize aNativeKey
  // with the characters which should be caused by the key.
  if (!IsInDeadKeySequence()) {
    aNativeKey.mCommittedCharsAndModifiers = baseChars;
    return;
  }

  // If the key doesn't cause a composite character with preceding dead key,
  // initialize aNativeKey with the dead-key character followed by current
  // key's character.
  UniCharsAndModifiers deadChars = GetDeadUniCharsAndModifiers();
  aNativeKey.mCommittedCharsAndModifiers = deadChars + baseChars;
  if (aNativeKey.IsKeyDownMessage()) {
    DeactivateDeadKeyState();
  }
}

bool
KeyboardLayout::MaybeInitNativeKeyAsDeadKey(
                  NativeKey& aNativeKey,
                  const ModifierKeyState& aModKeyState)
{
  // Only when it's not in dead key sequence, we can trust IsDeadKey() result.
  if (!IsInDeadKeySequence() &&
      !IsDeadKey(aNativeKey.mOriginalVirtualKeyCode, aModKeyState)) {
    return false;
  }

  // When keydown message is followed by a dead char message, it should be
  // initialized as dead key.
  bool isDeadKeyDownEvent =
    aNativeKey.IsKeyDownMessage() &&
    aNativeKey.IsFollowedByDeadCharMessage();

  // When keyup message is received, let's check if it's one of preceding
  // dead keys because keydown message order and keyup message order may be
  // different.
  bool isDeadKeyUpEvent =
    !aNativeKey.IsKeyDownMessage() &&
    mActiveDeadKeys.Contains(aNativeKey.mOriginalVirtualKeyCode);

  if (isDeadKeyDownEvent || isDeadKeyUpEvent) {
    ActivateDeadKeyState(aNativeKey, aModKeyState);
    // Any dead key events don't generate characters.  So, a dead key should
    // cause only keydown event and keyup event whose KeyboardEvent.key
    // values are "Dead".
    aNativeKey.mCommittedCharsAndModifiers.Clear();
    aNativeKey.mKeyNameIndex = KEY_NAME_INDEX_Dead;
    return true;
  }

  // At keydown message handling, we need to forget the first dead key
  // because there is no guarantee coming WM_KEYUP for the second dead
  // key before next WM_KEYDOWN.  E.g., due to auto key repeat or pressing
  // another dead key before releasing current key.  Therefore, we can
  // set only a character for current key for keyup event.
  if (!IsInDeadKeySequence()) {
    aNativeKey.mCommittedCharsAndModifiers =
      GetUniCharsAndModifiers(aNativeKey.mOriginalVirtualKeyCode, aModKeyState);
    return true;
  }

  // When non-printable key event comes during a dead key sequence, that must
  // be a modifier key event.  So, such events shouldn't be handled as a part
  // of the dead key sequence.
  if (!IsDeadKey(aNativeKey.mOriginalVirtualKeyCode, aModKeyState)) {
    return false;
  }

  // FYI: Following code may run when the user doesn't input text actually
  //      but the key sequence is a dead key sequence.  For example,
  //      ` -> Ctrl+` with Spanish keyboard layout.  Let's keep using this
  //      complicated code for now because this runs really rarely.

  // Dead key followed by another dead key may cause a composed character
  // (e.g., "Russian - Mnemonic" keyboard layout's 's' -> 'c').
  if (MaybeInitNativeKeyWithCompositeChar(aNativeKey, aModKeyState)) {
    return true;
  }

  // Otherwise, dead key followed by another dead key causes inputting both
  // character.
  UniCharsAndModifiers prevDeadChars = GetDeadUniCharsAndModifiers();
  UniCharsAndModifiers newChars =
    GetUniCharsAndModifiers(aNativeKey.mOriginalVirtualKeyCode, aModKeyState);
  // But keypress events should be fired for each committed character.
  aNativeKey.mCommittedCharsAndModifiers = prevDeadChars + newChars;
  if (aNativeKey.IsKeyDownMessage()) {
    DeactivateDeadKeyState();
  }
  return true;
}

bool
KeyboardLayout::MaybeInitNativeKeyWithCompositeChar(
                  NativeKey& aNativeKey,
                  const ModifierKeyState& aModKeyState)
{
  if (!IsInDeadKeySequence()) {
    return false;
  }

  if (NS_WARN_IF(!IsPrintableCharKey(aNativeKey.mOriginalVirtualKeyCode))) {
    return false;
  }

  UniCharsAndModifiers baseChars =
    GetUniCharsAndModifiers(aNativeKey.mOriginalVirtualKeyCode, aModKeyState);
  if (baseChars.IsEmpty() || !baseChars.CharAt(0)) {
    return false;
  }

  char16_t compositeChar = GetCompositeChar(baseChars.CharAt(0));
  if (!compositeChar) {
    return false;
  }

  // Active dead-key and base character does produce exactly one composite
  // character.
  aNativeKey.mCommittedCharsAndModifiers.Append(compositeChar,
                                                baseChars.ModifiersAt(0));
  if (aNativeKey.IsKeyDownMessage()) {
    DeactivateDeadKeyState();
  }
  return true;
}

UniCharsAndModifiers
KeyboardLayout::GetUniCharsAndModifiers(
                  uint8_t aVirtualKey,
                  VirtualKey::ShiftState aShiftState) const
{
  UniCharsAndModifiers result;
  int32_t key = GetKeyIndex(aVirtualKey);
  if (key < 0) {
    return result;
  }
  return mVirtualKeys[key].GetUniChars(aShiftState);
}

UniCharsAndModifiers
KeyboardLayout::GetNativeUniCharsAndModifiers(
                  uint8_t aVirtualKey,
                  const ModifierKeyState& aModKeyState) const
{
  int32_t key = GetKeyIndex(aVirtualKey);
  if (key < 0) {
    return UniCharsAndModifiers();
  }
  VirtualKey::ShiftState shiftState =
    VirtualKey::ModifierKeyStateToShiftState(aModKeyState);
  return mVirtualKeys[key].GetNativeUniChars(shiftState);
}

UniCharsAndModifiers
KeyboardLayout::GetDeadUniCharsAndModifiers() const
{
  MOZ_RELEASE_ASSERT(mActiveDeadKeys.Length() == mDeadKeyShiftStates.Length());

  if (NS_WARN_IF(mActiveDeadKeys.IsEmpty())) {
    return UniCharsAndModifiers();
  }

  UniCharsAndModifiers result;
  for (size_t i = 0; i < mActiveDeadKeys.Length(); ++i) {
    result +=
      GetUniCharsAndModifiers(mActiveDeadKeys[i], mDeadKeyShiftStates[i]);
  }
  return result;
}

char16_t
KeyboardLayout::GetCompositeChar(char16_t aBaseChar) const
{
  if (NS_WARN_IF(mActiveDeadKeys.IsEmpty())) {
    return 0;
  }
  // XXX Currently, we don't support computing a composite character with
  //     two or more dead keys since it needs big table for supporting
  //     long chained dead keys.  However, this should be a minor bug
  //     because this runs only when the latest keydown event does not cause
  //     WM_(SYS)CHAR messages.  So, when user wants to input a character,
  //     this path never runs.
  if (mActiveDeadKeys.Length() > 1) {
    return 0;
  }
  int32_t key = GetKeyIndex(mActiveDeadKeys[0]);
  if (key < 0) {
    return 0;
  }
  return mVirtualKeys[key].GetCompositeChar(mDeadKeyShiftStates[0], aBaseChar);
}

// static
HKL
KeyboardLayout::GetActiveLayout()
{
  return GetInstance()->mKeyboardLayout;
}

// static
nsCString
KeyboardLayout::GetActiveLayoutName()
{
  return GetInstance()->GetLayoutName(GetActiveLayout());
}

static bool IsValidKeyboardLayoutsChild(const nsAString& aChildName)
{
  if (aChildName.Length() != 8) {
    return false;
  }
  for (size_t i = 0; i < aChildName.Length(); i++) {
    if ((aChildName[i] >= '0' && aChildName[i] <= '9') ||
        (aChildName[i] >= 'a' && aChildName[i] <= 'f') ||
        (aChildName[i] >= 'A' && aChildName[i] <= 'F')) {
      continue;
    }
    return false;
  }
  return true;
}

nsCString
KeyboardLayout::GetLayoutName(HKL aLayout) const
{
  const wchar_t kKeyboardLayouts[] =
    L"SYSTEM\\CurrentControlSet\\Control\\Keyboard Layouts\\";
  uint16_t language = reinterpret_cast<uintptr_t>(aLayout) & 0xFFFF;
  uint16_t layout = (reinterpret_cast<uintptr_t>(aLayout) >> 16) & 0xFFFF;
  // If the layout is less than 0xA000XXXX (normal keyboard layout for the
  // language) or 0xEYYYXXXX (IMM-IME), we can retrieve its name simply.
  if (layout < 0xA000 || (layout & 0xF000) == 0xE000) {
    nsAutoString key(kKeyboardLayouts);
    key.AppendPrintf("%08X", layout < 0xA000 ?
                               layout : reinterpret_cast<uintptr_t>(aLayout));
    wchar_t buf[256];
    if (NS_WARN_IF(!WinUtils::GetRegistryKey(HKEY_LOCAL_MACHINE,
                                             key.get(), L"Layout Text",
                                             buf, sizeof(buf)))) {
      return NS_LITERAL_CSTRING("No name or too long name");
    }
    return NS_ConvertUTF16toUTF8(buf);
  }

  if (NS_WARN_IF((layout & 0xF000) != 0xF000)) {
    nsAutoCString result;
    result.AppendPrintf("Odd HKL: 0x%08X",
                        reinterpret_cast<uintptr_t>(aLayout));
    return result;
  }

  // Otherwise, we need to walk the registry under "Keyboard Layouts".
  nsCOMPtr<nsIWindowsRegKey> regKey =
    do_CreateInstance("@mozilla.org/windows-registry-key;1");
  if (NS_WARN_IF(!regKey)) {
    return EmptyCString();
  }
  nsresult rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                             nsString(kKeyboardLayouts),
                             nsIWindowsRegKey::ACCESS_READ);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return EmptyCString();
  }
  uint32_t childCount = 0;
  if (NS_WARN_IF(NS_FAILED(regKey->GetChildCount(&childCount))) ||
      NS_WARN_IF(!childCount)) {
    return EmptyCString();
  }
  for (uint32_t i = 0; i < childCount; i++) {
    nsAutoString childName;
    if (NS_WARN_IF(NS_FAILED(regKey->GetChildName(i, childName))) ||
        !IsValidKeyboardLayoutsChild(childName)) {
      continue;
    }
    uint32_t childNum = static_cast<uint32_t>(childName.ToInteger64(&rv, 16));
    if (NS_WARN_IF(NS_FAILED(rv))) {
      continue;
    }
    // Ignore normal keyboard layouts for each language.
    if (childNum <= 0xFFFF) {
      continue;
    }
    // If it doesn't start with 'A' nor 'a', language should be matched.
    if ((childNum & 0xFFFF) != language &&
        (childNum & 0xF0000000) != 0xA0000000) {
      continue;
    }
    // Then, the child should have "Layout Id" which is "YYY" of 0xFYYYXXXX.
    nsAutoString key(kKeyboardLayouts);
    key += childName;
    wchar_t buf[256];
    if (NS_WARN_IF(!WinUtils::GetRegistryKey(HKEY_LOCAL_MACHINE,
                                             key.get(), L"Layout Id",
                                             buf, sizeof(buf)))) {
      continue;
    }
    uint16_t layoutId = wcstol(buf, nullptr, 16);
    if (layoutId != (layout & 0x0FFF)) {
      continue;
    }
    if (NS_WARN_IF(!WinUtils::GetRegistryKey(HKEY_LOCAL_MACHINE,
                                             key.get(), L"Layout Text",
                                             buf, sizeof(buf)))) {
      continue;
    }
    return NS_ConvertUTF16toUTF8(buf);
  }
  return EmptyCString();
}

void
KeyboardLayout::LoadLayout(HKL aLayout)
{
  mIsPendingToRestoreKeyboardLayout = false;

  if (mKeyboardLayout == aLayout) {
    return;
  }

  mKeyboardLayout = aLayout;

  MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Info,
    ("KeyboardLayout::LoadLayout(aLayout=0x%08X (%s))",
     aLayout, GetLayoutName(aLayout).get()));

  BYTE kbdState[256];
  memset(kbdState, 0, sizeof(kbdState));

  BYTE originalKbdState[256];
  // Bitfield with all shift states that have at least one dead-key.
  uint16_t shiftStatesWithDeadKeys = 0;
  // Bitfield with all shift states that produce any possible dead-key base
  // characters.
  uint16_t shiftStatesWithBaseChars = 0;

  mActiveDeadKeys.Clear();
  mDeadKeyShiftStates.Clear();

  ReleaseDeadKeyTables();

  ::GetKeyboardState(originalKbdState);

  // For each shift state gather all printable characters that are produced
  // for normal case when no any dead-key is active.

  for (VirtualKey::ShiftState shiftState = 0; shiftState < 16; shiftState++) {
    VirtualKey::FillKbdState(kbdState, shiftState);
    for (uint32_t virtualKey = 0; virtualKey < 256; virtualKey++) {
      int32_t vki = GetKeyIndex(virtualKey);
      if (vki < 0) {
        continue;
      }
      NS_ASSERTION(uint32_t(vki) < ArrayLength(mVirtualKeys), "invalid index");
      char16_t uniChars[5];
      int32_t ret =
        ::ToUnicodeEx(virtualKey, 0, kbdState, (LPWSTR)uniChars,
                      ArrayLength(uniChars), 0, mKeyboardLayout);
      // dead-key
      if (ret < 0) {
        shiftStatesWithDeadKeys |= (1 << shiftState);
        // Repeat dead-key to deactivate it and get its character
        // representation.
        char16_t deadChar[2];
        ret = ::ToUnicodeEx(virtualKey, 0, kbdState, (LPWSTR)deadChar,
                            ArrayLength(deadChar), 0, mKeyboardLayout);
        NS_ASSERTION(ret == 2, "Expecting twice repeated dead-key character");
        mVirtualKeys[vki].SetDeadChar(shiftState, deadChar[0]);

        MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Debug,
          ("  %s (%d): DeadChar(%s, %s) (ret=%d)",
           kVirtualKeyName[virtualKey], vki,
           GetShiftStateName(shiftState).get(),
           GetCharacterCodeName(deadChar, 1).get(), ret));
      } else {
        if (ret == 1) {
          // dead-key can pair only with exactly one base character.
          shiftStatesWithBaseChars |= (1 << shiftState);
        }
        mVirtualKeys[vki].SetNormalChars(shiftState, uniChars, ret);
        MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Verbose,
          ("  %s (%d): NormalChar(%s, %s) (ret=%d)",
           kVirtualKeyName[virtualKey], vki,
           GetShiftStateName(shiftState).get(),
           GetCharacterCodeName(uniChars, ret).get(), ret));
      }
    }
  }

  // Now process each dead-key to find all its base characters and resulting
  // composite characters.
  for (VirtualKey::ShiftState shiftState = 0; shiftState < 16; shiftState++) {
    if (!(shiftStatesWithDeadKeys & (1 << shiftState))) {
      continue;
    }

    VirtualKey::FillKbdState(kbdState, shiftState);

    for (uint32_t virtualKey = 0; virtualKey < 256; virtualKey++) {
      int32_t vki = GetKeyIndex(virtualKey);
      if (vki >= 0 && mVirtualKeys[vki].IsDeadKey(shiftState)) {
        DeadKeyEntry deadKeyArray[256];
        int32_t n = GetDeadKeyCombinations(virtualKey, kbdState,
                                           shiftStatesWithBaseChars,
                                           deadKeyArray,
                                           ArrayLength(deadKeyArray));
        const DeadKeyTable* dkt =
          mVirtualKeys[vki].MatchingDeadKeyTable(deadKeyArray, n);
        if (!dkt) {
          dkt = AddDeadKeyTable(deadKeyArray, n);
        }
        mVirtualKeys[vki].AttachDeadKeyTable(shiftState, dkt);
      }
    }
  }

  ::SetKeyboardState(originalKbdState);

  if (MOZ_LOG_TEST(sKeyboardLayoutLogger, LogLevel::Verbose)) {
    static const UINT kExtendedScanCode[] = { 0x0000, 0xE000 };
    static const UINT kMapType = MAPVK_VSC_TO_VK_EX;
    MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Verbose,
      ("Logging virtual keycode values for scancode (0x%p)...",
       mKeyboardLayout));
    for (uint32_t i = 0; i < ArrayLength(kExtendedScanCode); i++) {
      for (uint32_t j = 1; j <= 0xFF; j++) {
        UINT scanCode = kExtendedScanCode[i] + j;
        UINT virtualKeyCode =
          ::MapVirtualKeyEx(scanCode, kMapType, mKeyboardLayout);
        MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Verbose,
          ("0x%04X, %s", scanCode, kVirtualKeyName[virtualKeyCode]));
      }
    }
  }
}

inline int32_t
KeyboardLayout::GetKeyIndex(uint8_t aVirtualKey)
{
// Currently these 68 (NS_NUM_OF_KEYS) virtual keys are assumed
// to produce visible representation:
// 0x20 - VK_SPACE          ' '
// 0x30..0x39               '0'..'9'
// 0x41..0x5A               'A'..'Z'
// 0x60..0x69               '0'..'9' on numpad
// 0x6A - VK_MULTIPLY       '*' on numpad
// 0x6B - VK_ADD            '+' on numpad
// 0x6D - VK_SUBTRACT       '-' on numpad
// 0x6E - VK_DECIMAL        '.' on numpad
// 0x6F - VK_DIVIDE         '/' on numpad
// 0x6E - VK_DECIMAL        '.'
// 0xBA - VK_OEM_1          ';:' for US
// 0xBB - VK_OEM_PLUS       '+' any country
// 0xBC - VK_OEM_COMMA      ',' any country
// 0xBD - VK_OEM_MINUS      '-' any country
// 0xBE - VK_OEM_PERIOD     '.' any country
// 0xBF - VK_OEM_2          '/?' for US
// 0xC0 - VK_OEM_3          '`~' for US
// 0xC1 - VK_ABNT_C1        '/?' for Brazilian
// 0xC2 - VK_ABNT_C2        separator key on numpad (Brazilian or JIS for Mac)
// 0xDB - VK_OEM_4          '[{' for US
// 0xDC - VK_OEM_5          '\|' for US
// 0xDD - VK_OEM_6          ']}' for US
// 0xDE - VK_OEM_7          ''"' for US
// 0xDF - VK_OEM_8
// 0xE1 - no name
// 0xE2 - VK_OEM_102        '\_' for JIS
// 0xE3 - no name
// 0xE4 - no name

  static const int8_t xlat[256] =
  {
  // 0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
  //-----------------------------------------------------------------------
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // 00
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // 10
     0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // 20
     1,  2,  3,  4,  5,  6,  7,  8,  9, 10, -1, -1, -1, -1, -1, -1,   // 30
    -1, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,   // 40
    26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, -1, -1, -1, -1, -1,   // 50
    37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, -1, 49, 50, 51,   // 60
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // 70
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // 80
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // 90
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // A0
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 52, 53, 54, 55, 56, 57,   // B0
    58, 59, 60, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // C0
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 61, 62, 63, 64, 65,   // D0
    -1, 66, 67, 68, 69, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,   // E0
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1    // F0
  };

  return xlat[aVirtualKey];
}

int
KeyboardLayout::CompareDeadKeyEntries(const void* aArg1,
                                      const void* aArg2,
                                      void*)
{
  const DeadKeyEntry* arg1 = static_cast<const DeadKeyEntry*>(aArg1);
  const DeadKeyEntry* arg2 = static_cast<const DeadKeyEntry*>(aArg2);

  return arg1->BaseChar - arg2->BaseChar;
}

const DeadKeyTable*
KeyboardLayout::AddDeadKeyTable(const DeadKeyEntry* aDeadKeyArray,
                                uint32_t aEntries)
{
  DeadKeyTableListEntry* next = mDeadKeyTableListHead;

  const size_t bytes = offsetof(DeadKeyTableListEntry, data) +
    DeadKeyTable::SizeInBytes(aEntries);
  uint8_t* p = new uint8_t[bytes];

  mDeadKeyTableListHead = reinterpret_cast<DeadKeyTableListEntry*>(p);
  mDeadKeyTableListHead->next = next;

  DeadKeyTable* dkt =
    reinterpret_cast<DeadKeyTable*>(mDeadKeyTableListHead->data);

  dkt->Init(aDeadKeyArray, aEntries);

  return dkt;
}

void
KeyboardLayout::ReleaseDeadKeyTables()
{
  while (mDeadKeyTableListHead) {
    uint8_t* p = reinterpret_cast<uint8_t*>(mDeadKeyTableListHead);
    mDeadKeyTableListHead = mDeadKeyTableListHead->next;

    delete [] p;
  }
}

bool
KeyboardLayout::EnsureDeadKeyActive(bool aIsActive,
                                    uint8_t aDeadKey,
                                    const PBYTE aDeadKeyKbdState)
{
  int32_t ret;
  do {
    char16_t dummyChars[5];
    ret = ::ToUnicodeEx(aDeadKey, 0, (PBYTE)aDeadKeyKbdState,
                        (LPWSTR)dummyChars, ArrayLength(dummyChars), 0,
                        mKeyboardLayout);
    // returned values:
    // <0 - Dead key state is active. The keyboard driver will wait for next
    //      character.
    //  1 - Previous pressed key was a valid base character that produced
    //      exactly one composite character.
    // >1 - Previous pressed key does not produce any composite characters.
    //      Return dead-key character followed by base character(s).
  } while ((ret < 0) != aIsActive);

  return (ret < 0);
}

void
KeyboardLayout::ActivateDeadKeyState(const NativeKey& aNativeKey,
                                     const ModifierKeyState& aModKeyState)
{
  // Dead-key state should be activated at keydown.
  if (!aNativeKey.IsKeyDownMessage()) {
    return;
  }

  mActiveDeadKeys.AppendElement(aNativeKey.mOriginalVirtualKeyCode);
  mDeadKeyShiftStates.AppendElement(
    VirtualKey::ModifierKeyStateToShiftState(aModKeyState));
}

void
KeyboardLayout::DeactivateDeadKeyState()
{
  if (mActiveDeadKeys.IsEmpty()) {
    return;
  }

  BYTE kbdState[256];
  memset(kbdState, 0, sizeof(kbdState));

  // Assume that the last dead key can finish dead key sequence.
  VirtualKey::FillKbdState(kbdState, mDeadKeyShiftStates.LastElement());
  EnsureDeadKeyActive(false, mActiveDeadKeys.LastElement(), kbdState);
  mActiveDeadKeys.Clear();
  mDeadKeyShiftStates.Clear();
}

bool
KeyboardLayout::AddDeadKeyEntry(char16_t aBaseChar,
                                char16_t aCompositeChar,
                                DeadKeyEntry* aDeadKeyArray,
                                uint32_t aEntries)
{
  for (uint32_t index = 0; index < aEntries; index++) {
    if (aDeadKeyArray[index].BaseChar == aBaseChar) {
      return false;
    }
  }

  aDeadKeyArray[aEntries].BaseChar = aBaseChar;
  aDeadKeyArray[aEntries].CompositeChar = aCompositeChar;

  return true;
}

uint32_t
KeyboardLayout::GetDeadKeyCombinations(uint8_t aDeadKey,
                                       const PBYTE aDeadKeyKbdState,
                                       uint16_t aShiftStatesWithBaseChars,
                                       DeadKeyEntry* aDeadKeyArray,
                                       uint32_t aMaxEntries)
{
  bool deadKeyActive = false;
  uint32_t entries = 0;
  BYTE kbdState[256];
  memset(kbdState, 0, sizeof(kbdState));

  for (uint32_t shiftState = 0; shiftState < 16; shiftState++) {
    if (!(aShiftStatesWithBaseChars & (1 << shiftState))) {
      continue;
    }

    VirtualKey::FillKbdState(kbdState, shiftState);

    for (uint32_t virtualKey = 0; virtualKey < 256; virtualKey++) {
      int32_t vki = GetKeyIndex(virtualKey);
      // Dead-key can pair only with such key that produces exactly one base
      // character.
      if (vki >= 0 &&
          mVirtualKeys[vki].GetNativeUniChars(shiftState).Length() == 1) {
        // Ensure dead-key is in active state, when it swallows entered
        // character and waits for the next pressed key.
        if (!deadKeyActive) {
          deadKeyActive = EnsureDeadKeyActive(true, aDeadKey,
                                              aDeadKeyKbdState);
        }

        // Depending on the character the followed the dead-key, the keyboard
        // driver can produce one composite character, or a dead-key character
        // followed by a second character.
        char16_t compositeChars[5];
        int32_t ret =
          ::ToUnicodeEx(virtualKey, 0, kbdState, (LPWSTR)compositeChars,
                        ArrayLength(compositeChars), 0, mKeyboardLayout);
        switch (ret) {
          case 0:
            // This key combination does not produce any characters. The
            // dead-key is still in active state.
            break;
          case 1: {
            char16_t baseChars[5];
            ret = ::ToUnicodeEx(virtualKey, 0, kbdState, (LPWSTR)baseChars,
                                ArrayLength(baseChars), 0, mKeyboardLayout);
            if (entries < aMaxEntries) {
              switch (ret) {
                case 1:
                  // Exactly one composite character produced. Now, when
                  // dead-key is not active, repeat the last character one more
                  // time to determine the base character.
                  if (AddDeadKeyEntry(baseChars[0], compositeChars[0],
                                      aDeadKeyArray, entries)) {
                    entries++;
                  }
                  deadKeyActive = false;
                  break;
                case -1: {
                  // If pressing another dead-key produces different character,
                  // we should register the dead-key entry with first character
                  // produced by current key.

                  // First inactivate the dead-key state completely.
                  deadKeyActive =
                    EnsureDeadKeyActive(false, aDeadKey, aDeadKeyKbdState);
                  if (NS_WARN_IF(deadKeyActive)) {
                    MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Error,
                      ("  failed to deactivating the dead-key state..."));
                    break;
                  }
                  for (int32_t i = 0; i < 5; ++i) {
                    ret = ::ToUnicodeEx(virtualKey, 0, kbdState,
                                        (LPWSTR)baseChars,
                                        ArrayLength(baseChars),
                                        0, mKeyboardLayout);
                    if (ret >= 0) {
                      break;
                    }
                  }
                  if (ret > 0 &&
                      AddDeadKeyEntry(baseChars[0], compositeChars[0],
                                      aDeadKeyArray, entries)) {
                    entries++;
                  }
                  // Inactivate dead-key state for current virtual keycode.
                  EnsureDeadKeyActive(false, virtualKey, kbdState);
                  break;
                }
                default:
                  NS_WARN_IF("File a bug for this dead-key handling!");
                  deadKeyActive = false;
                  break;
              }
            }
            MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Debug,
              ("  %s -> %s (%d): DeadKeyEntry(%s, %s) (ret=%d)",
               kVirtualKeyName[aDeadKey], kVirtualKeyName[virtualKey], vki,
               GetCharacterCodeName(compositeChars, 1).get(),
               ret <= 0 ? "''" :
                 GetCharacterCodeName(baseChars, std::min(ret, 5)).get(), ret));
            break;
          }
          default:
            // 1. Unexpected dead-key. Dead-key chaining is not supported.
            // 2. More than one character generated. This is not a valid
            //    dead-key and base character combination.
            deadKeyActive = false;
            MOZ_LOG(sKeyboardLayoutLogger, LogLevel::Verbose,
              ("  %s -> %s (%d): Unsupport dead key type(%s) (ret=%d)",
               kVirtualKeyName[aDeadKey], kVirtualKeyName[virtualKey], vki,
               ret <= 0 ? "''" :
                 GetCharacterCodeName(compositeChars,
                                      std::min(ret, 5)).get(), ret));
            break;
        }
      }
    }
  }

  if (deadKeyActive) {
    deadKeyActive = EnsureDeadKeyActive(false, aDeadKey, aDeadKeyKbdState);
  }

  NS_QuickSort(aDeadKeyArray, entries, sizeof(DeadKeyEntry),
               CompareDeadKeyEntries, nullptr);
  return entries;
}

uint32_t
KeyboardLayout::ConvertNativeKeyCodeToDOMKeyCode(UINT aNativeKeyCode) const
{
  // Alphabet or Numeric or Numpad or Function keys
  if ((aNativeKeyCode >= 0x30 && aNativeKeyCode <= 0x39) ||
      (aNativeKeyCode >= 0x41 && aNativeKeyCode <= 0x5A) ||
      (aNativeKeyCode >= 0x60 && aNativeKeyCode <= 0x87)) {
    return static_cast<uint32_t>(aNativeKeyCode);
  }
  switch (aNativeKeyCode) {
    // Following keycodes are same as our DOM keycodes
    case VK_CANCEL:
    case VK_BACK:
    case VK_TAB:
    case VK_CLEAR:
    case VK_RETURN:
    case VK_SHIFT:
    case VK_CONTROL:
    case VK_MENU: // Alt
    case VK_PAUSE:
    case VK_CAPITAL: // CAPS LOCK
    case VK_KANA: // same as VK_HANGUL
    case VK_JUNJA:
    case VK_FINAL:
    case VK_HANJA: // same as VK_KANJI
    case VK_ESCAPE:
    case VK_CONVERT:
    case VK_NONCONVERT:
    case VK_ACCEPT:
    case VK_MODECHANGE:
    case VK_SPACE:
    case VK_PRIOR: // PAGE UP
    case VK_NEXT: // PAGE DOWN
    case VK_END:
    case VK_HOME:
    case VK_LEFT:
    case VK_UP:
    case VK_RIGHT:
    case VK_DOWN:
    case VK_SELECT:
    case VK_PRINT:
    case VK_EXECUTE:
    case VK_SNAPSHOT:
    case VK_INSERT:
    case VK_DELETE:
    case VK_APPS: // Context Menu
    case VK_SLEEP:
    case VK_NUMLOCK:
    case VK_SCROLL: // SCROLL LOCK
    case VK_ATTN: // Attension key of IBM midrange computers, e.g., AS/400
    case VK_CRSEL: // Cursor Selection
    case VK_EXSEL: // Extend Selection
    case VK_EREOF: // Erase EOF key of IBM 3270 keyboard layout
    case VK_PLAY:
    case VK_ZOOM:
    case VK_PA1: // PA1 key of IBM 3270 keyboard layout
      return uint32_t(aNativeKeyCode);

    case VK_HELP:
      return NS_VK_HELP;

    // Windows key should be mapped to a Win keycode
    // They should be able to be distinguished by DOM3 KeyboardEvent.location
    case VK_LWIN:
    case VK_RWIN:
      return NS_VK_WIN;

    case VK_VOLUME_MUTE:
      return NS_VK_VOLUME_MUTE;
    case VK_VOLUME_DOWN:
      return NS_VK_VOLUME_DOWN;
    case VK_VOLUME_UP:
      return NS_VK_VOLUME_UP;

    // Following keycodes are not defined in our DOM keycodes.
    case VK_BROWSER_BACK:
    case VK_BROWSER_FORWARD:
    case VK_BROWSER_REFRESH:
    case VK_BROWSER_STOP:
    case VK_BROWSER_SEARCH:
    case VK_BROWSER_FAVORITES:
    case VK_BROWSER_HOME:
    case VK_MEDIA_NEXT_TRACK:
    case VK_MEDIA_PREV_TRACK:
    case VK_MEDIA_STOP:
    case VK_MEDIA_PLAY_PAUSE:
    case VK_LAUNCH_MAIL:
    case VK_LAUNCH_MEDIA_SELECT:
    case VK_LAUNCH_APP1:
    case VK_LAUNCH_APP2:
      return 0;

    // Following OEM specific virtual keycodes should pass through DOM keyCode
    // for compatibility with the other browsers on Windows.

    // Following OEM specific virtual keycodes are defined for Fujitsu/OASYS.
    case VK_OEM_FJ_JISHO:
    case VK_OEM_FJ_MASSHOU:
    case VK_OEM_FJ_TOUROKU:
    case VK_OEM_FJ_LOYA:
    case VK_OEM_FJ_ROYA:
    // Not sure what means "ICO".
    case VK_ICO_HELP:
    case VK_ICO_00:
    case VK_ICO_CLEAR:
    // Following OEM specific virtual keycodes are defined for Nokia/Ericsson.
    case VK_OEM_RESET:
    case VK_OEM_JUMP:
    case VK_OEM_PA1:
    case VK_OEM_PA2:
    case VK_OEM_PA3:
    case VK_OEM_WSCTRL:
    case VK_OEM_CUSEL:
    case VK_OEM_ATTN:
    case VK_OEM_FINISH:
    case VK_OEM_COPY:
    case VK_OEM_AUTO:
    case VK_OEM_ENLW:
    case VK_OEM_BACKTAB:
    // VK_OEM_CLEAR is defined as not OEM specific, but let's pass though
    // DOM keyCode like other OEM specific virtual keycodes.
    case VK_OEM_CLEAR:
      return uint32_t(aNativeKeyCode);

    // 0xE1 is an OEM specific virtual keycode. However, the value is already
    // used in our DOM keyCode for AltGr on Linux. So, this virtual keycode
    // cannot pass through DOM keyCode.
    case 0xE1:
      return 0;

    // Following keycodes are OEM keys which are keycodes for non-alphabet and
    // non-numeric keys, we should compute each keycode of them from unshifted
    // character which is inputted by each key.  But if the unshifted character
    // is not an ASCII character but shifted character is an ASCII character,
    // we should refer it.
    case VK_OEM_1:
    case VK_OEM_PLUS:
    case VK_OEM_COMMA:
    case VK_OEM_MINUS:
    case VK_OEM_PERIOD:
    case VK_OEM_2:
    case VK_OEM_3:
    case VK_OEM_4:
    case VK_OEM_5:
    case VK_OEM_6:
    case VK_OEM_7:
    case VK_OEM_8:
    case VK_OEM_102:
    case VK_ABNT_C1:
    {
      NS_ASSERTION(IsPrintableCharKey(aNativeKeyCode),
                   "The key must be printable");
      ModifierKeyState modKeyState(0);
      UniCharsAndModifiers uniChars =
        GetUniCharsAndModifiers(aNativeKeyCode, modKeyState);
      if (uniChars.Length() != 1 ||
          uniChars.CharAt(0) < ' ' || uniChars.CharAt(0) > 0x7F) {
        modKeyState.Set(MODIFIER_SHIFT);
        uniChars = GetUniCharsAndModifiers(aNativeKeyCode, modKeyState);
        if (uniChars.Length() != 1 ||
            uniChars.CharAt(0) < ' ' || uniChars.CharAt(0) > 0x7F) {
          return 0;
        }
      }
      return WidgetUtils::ComputeKeyCodeFromChar(uniChars.CharAt(0));
    }

    // IE sets 0xC2 to the DOM keyCode for VK_ABNT_C2.  However, we're already
    // using NS_VK_SEPARATOR for the separator key on Mac and Linux.  Therefore,
    // We should keep consistency between Gecko on all platforms rather than
    // with other browsers since a lot of keyCode values are already different
    // between browsers.
    case VK_ABNT_C2:
      return NS_VK_SEPARATOR;

    // VK_PROCESSKEY means IME already consumed the key event.
    case VK_PROCESSKEY:
      return 0;
    // VK_PACKET is generated by SendInput() API, we don't need to
    // care this message as key event.
    case VK_PACKET:
      return 0;
    // If a key is not mapped to a virtual keycode, 0xFF is used.
    case 0xFF:
      NS_WARNING("The key is failed to be converted to a virtual keycode");
      return 0;
  }
#ifdef DEBUG
  nsPrintfCString warning("Unknown virtual keycode (0x%08X), please check the "
                          "latest MSDN document, there may be some new "
                          "keycodes we've never known.",
                          aNativeKeyCode);
  NS_WARNING(warning.get());
#endif
  return 0;
}

KeyNameIndex
KeyboardLayout::ConvertNativeKeyCodeToKeyNameIndex(uint8_t aVirtualKey) const
{
  if (IsPrintableCharKey(aVirtualKey) || aVirtualKey == VK_PACKET) {
    return KEY_NAME_INDEX_USE_STRING;
  }

  switch (aVirtualKey) {

#undef NS_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX
#define NS_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX(aNativeKey, aKeyNameIndex) \
    case aNativeKey: return aKeyNameIndex;

#include "NativeKeyToDOMKeyName.h"

#undef NS_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX

    default:
      break;
  }

  HKL layout = GetLayout();
  WORD langID = LOWORD(static_cast<HKL>(layout));
  WORD primaryLangID = PRIMARYLANGID(langID);

  if (primaryLangID == LANG_JAPANESE) {
    switch (aVirtualKey) {

#undef NS_JAPANESE_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX
#define NS_JAPANESE_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX(aNativeKey, aKeyNameIndex)\
      case aNativeKey: return aKeyNameIndex;

#include "NativeKeyToDOMKeyName.h"

#undef NS_JAPANESE_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX

      default:
        break;
    }
  } else if (primaryLangID == LANG_KOREAN) {
    switch (aVirtualKey) {

#undef NS_KOREAN_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX
#define NS_KOREAN_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX(aNativeKey, aKeyNameIndex)\
      case aNativeKey: return aKeyNameIndex;

#include "NativeKeyToDOMKeyName.h"

#undef NS_KOREAN_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX

      default:
        return KEY_NAME_INDEX_Unidentified;
    }
  }

  switch (aVirtualKey) {

#undef NS_OTHER_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX
#define NS_OTHER_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX(aNativeKey, aKeyNameIndex)\
    case aNativeKey: return aKeyNameIndex;

#include "NativeKeyToDOMKeyName.h"

#undef NS_OTHER_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX

    default:
      return KEY_NAME_INDEX_Unidentified;
  }
}

// static
CodeNameIndex
KeyboardLayout::ConvertScanCodeToCodeNameIndex(UINT aScanCode)
{
  switch (aScanCode) {

#define NS_NATIVE_KEY_TO_DOM_CODE_NAME_INDEX(aNativeKey, aCodeNameIndex) \
    case aNativeKey: return aCodeNameIndex;

#include "NativeKeyToDOMCodeName.h"

#undef NS_NATIVE_KEY_TO_DOM_CODE_NAME_INDEX

    default:
      return CODE_NAME_INDEX_UNKNOWN;
  }
}

nsresult
KeyboardLayout::SynthesizeNativeKeyEvent(nsWindowBase* aWidget,
                                         int32_t aNativeKeyboardLayout,
                                         int32_t aNativeKeyCode,
                                         uint32_t aModifierFlags,
                                         const nsAString& aCharacters,
                                         const nsAString& aUnmodifiedCharacters)
{
  UINT keyboardLayoutListCount = ::GetKeyboardLayoutList(0, nullptr);
  NS_ASSERTION(keyboardLayoutListCount > 0,
               "One keyboard layout must be installed at least");
  HKL keyboardLayoutListBuff[50];
  HKL* keyboardLayoutList =
    keyboardLayoutListCount < 50 ? keyboardLayoutListBuff :
                                   new HKL[keyboardLayoutListCount];
  keyboardLayoutListCount =
    ::GetKeyboardLayoutList(keyboardLayoutListCount, keyboardLayoutList);
  NS_ASSERTION(keyboardLayoutListCount > 0,
               "Failed to get all keyboard layouts installed on the system");

  nsPrintfCString layoutName("%08x", aNativeKeyboardLayout);
  HKL loadedLayout = LoadKeyboardLayoutA(layoutName.get(), KLF_NOTELLSHELL);
  if (loadedLayout == nullptr) {
    if (keyboardLayoutListBuff != keyboardLayoutList) {
      delete [] keyboardLayoutList;
    }
    return NS_ERROR_NOT_AVAILABLE;
  }

  // Setup clean key state and load desired layout
  BYTE originalKbdState[256];
  ::GetKeyboardState(originalKbdState);
  BYTE kbdState[256];
  memset(kbdState, 0, sizeof(kbdState));
  // This changes the state of the keyboard for the current thread only,
  // and we'll restore it soon, so this should be OK.
  ::SetKeyboardState(kbdState);

  OverrideLayout(loadedLayout);

  uint8_t argumentKeySpecific = 0;
  switch (aNativeKeyCode & 0xFF) {
    case VK_SHIFT:
      aModifierFlags &= ~(nsIWidget::SHIFT_L | nsIWidget::SHIFT_R);
      argumentKeySpecific = VK_LSHIFT;
      break;
    case VK_LSHIFT:
      aModifierFlags &= ~nsIWidget::SHIFT_L;
      argumentKeySpecific = aNativeKeyCode & 0xFF;
      aNativeKeyCode = (aNativeKeyCode & 0xFFFF0000) | VK_SHIFT;
      break;
    case VK_RSHIFT:
      aModifierFlags &= ~nsIWidget::SHIFT_R;
      argumentKeySpecific = aNativeKeyCode & 0xFF;
      aNativeKeyCode = (aNativeKeyCode & 0xFFFF0000) | VK_SHIFT;
      break;
    case VK_CONTROL:
      aModifierFlags &= ~(nsIWidget::CTRL_L | nsIWidget::CTRL_R);
      argumentKeySpecific = VK_LCONTROL;
      break;
    case VK_LCONTROL:
      aModifierFlags &= ~nsIWidget::CTRL_L;
      argumentKeySpecific = aNativeKeyCode & 0xFF;
      aNativeKeyCode = (aNativeKeyCode & 0xFFFF0000) | VK_CONTROL;
      break;
    case VK_RCONTROL:
      aModifierFlags &= ~nsIWidget::CTRL_R;
      argumentKeySpecific = aNativeKeyCode & 0xFF;
      aNativeKeyCode = (aNativeKeyCode & 0xFFFF0000) | VK_CONTROL;
      break;
    case VK_MENU:
      aModifierFlags &= ~(nsIWidget::ALT_L | nsIWidget::ALT_R);
      argumentKeySpecific = VK_LMENU;
      break;
    case VK_LMENU:
      aModifierFlags &= ~nsIWidget::ALT_L;
      argumentKeySpecific = aNativeKeyCode & 0xFF;
      aNativeKeyCode = (aNativeKeyCode & 0xFFFF0000) | VK_MENU;
      break;
    case VK_RMENU:
      aModifierFlags &= ~nsIWidget::ALT_R;
      argumentKeySpecific = aNativeKeyCode & 0xFF;
      aNativeKeyCode = (aNativeKeyCode & 0xFFFF0000) | VK_MENU;
      break;
    case VK_CAPITAL:
      aModifierFlags &= ~nsIWidget::CAPS_LOCK;
      argumentKeySpecific = VK_CAPITAL;
      break;
    case VK_NUMLOCK:
      aModifierFlags &= ~nsIWidget::NUM_LOCK;
      argumentKeySpecific = VK_NUMLOCK;
      break;
  }

  AutoTArray<KeyPair,10> keySequence;
  WinUtils::SetupKeyModifiersSequence(&keySequence, aModifierFlags);
  keySequence.AppendElement(KeyPair(aNativeKeyCode, argumentKeySpecific));

  // Simulate the pressing of each modifier key and then the real key
  // FYI: Each NativeKey instance here doesn't need to override keyboard layout
  //      since this method overrides and restores the keyboard layout.
  for (uint32_t i = 0; i < keySequence.Length(); ++i) {
    uint8_t key = keySequence[i].mGeneral;
    uint8_t keySpecific = keySequence[i].mSpecific;
    uint16_t scanCode = keySequence[i].mScanCode;
    kbdState[key] = 0x81; // key is down and toggled on if appropriate
    if (keySpecific) {
      kbdState[keySpecific] = 0x81;
    }
    ::SetKeyboardState(kbdState);
    ModifierKeyState modKeyState;
    // If scan code isn't specified explicitly, let's compute it with current
    // keyboard layout.
    if (!scanCode) {
      scanCode =
        ComputeScanCodeForVirtualKeyCode(keySpecific ? keySpecific : key);
    }
    LPARAM lParam = static_cast<LPARAM>(scanCode << 16);
    // If the scan code is for an extended key, set extended key flag.
    if ((scanCode & 0xFF00) == 0xE000) {
      lParam |= 0x1000000;
    }
    bool makeSysKeyMsg = IsSysKey(key, modKeyState);
    MSG keyDownMsg =
      WinUtils::InitMSG(makeSysKeyMsg ? WM_SYSKEYDOWN : WM_KEYDOWN,
                        key, lParam, aWidget->GetWindowHandle());
    if (i == keySequence.Length() - 1) {
      bool makeDeadCharMsg =
        (IsDeadKey(key, modKeyState) && aCharacters.IsEmpty());
      nsAutoString chars(aCharacters);
      if (makeDeadCharMsg) {
        UniCharsAndModifiers deadChars =
          GetUniCharsAndModifiers(key, modKeyState);
        chars = deadChars.ToString();
        NS_ASSERTION(chars.Length() == 1,
                     "Dead char must be only one character");
      }
      if (chars.IsEmpty()) {
        NativeKey nativeKey(aWidget, keyDownMsg, modKeyState);
        nativeKey.HandleKeyDownMessage();
      } else {
        AutoTArray<NativeKey::FakeCharMsg, 10> fakeCharMsgs;
        for (uint32_t j = 0; j < chars.Length(); j++) {
          NativeKey::FakeCharMsg* fakeCharMsg = fakeCharMsgs.AppendElement();
          fakeCharMsg->mCharCode = chars.CharAt(j);
          fakeCharMsg->mScanCode = scanCode;
          fakeCharMsg->mIsSysKey = makeSysKeyMsg;
          fakeCharMsg->mIsDeadKey = makeDeadCharMsg;
        }
        NativeKey nativeKey(aWidget, keyDownMsg, modKeyState, 0, &fakeCharMsgs);
        bool dispatched;
        nativeKey.HandleKeyDownMessage(&dispatched);
        // If some char messages are not consumed, let's emulate the widget
        // receiving the message directly.
        for (uint32_t j = 1; j < fakeCharMsgs.Length(); j++) {
          if (fakeCharMsgs[j].mConsumed) {
            continue;
          }
          MSG charMsg = fakeCharMsgs[j].GetCharMsg(aWidget->GetWindowHandle());
          NativeKey nativeKey(aWidget, charMsg, modKeyState);
          nativeKey.HandleCharMessage(charMsg);
        }
      }
    } else {
      NativeKey nativeKey(aWidget, keyDownMsg, modKeyState);
      nativeKey.HandleKeyDownMessage();
    }
  }
  for (uint32_t i = keySequence.Length(); i > 0; --i) {
    uint8_t key = keySequence[i - 1].mGeneral;
    uint8_t keySpecific = keySequence[i - 1].mSpecific;
    uint16_t scanCode = keySequence[i - 1].mScanCode;
    kbdState[key] = 0; // key is up and toggled off if appropriate
    if (keySpecific) {
      kbdState[keySpecific] = 0;
    }
    ::SetKeyboardState(kbdState);
    ModifierKeyState modKeyState;
    // If scan code isn't specified explicitly, let's compute it with current
    // keyboard layout.
    if (!scanCode) {
      scanCode =
        ComputeScanCodeForVirtualKeyCode(keySpecific ? keySpecific : key);
    }
    LPARAM lParam = static_cast<LPARAM>(scanCode << 16);
    // If the scan code is for an extended key, set extended key flag.
    if ((scanCode & 0xFF00) == 0xE000) {
      lParam |= 0x1000000;
    }
    // Don't use WM_SYSKEYUP for Alt keyup.
    bool makeSysKeyMsg = IsSysKey(key, modKeyState) && key != VK_MENU;
    MSG keyUpMsg = WinUtils::InitMSG(makeSysKeyMsg ? WM_SYSKEYUP : WM_KEYUP,
                                     key, lParam,
                                     aWidget->GetWindowHandle());
    NativeKey nativeKey(aWidget, keyUpMsg, modKeyState);
    nativeKey.HandleKeyUpMessage();
  }

  // Restore old key state and layout
  ::SetKeyboardState(originalKbdState);
  RestoreLayout();

  // Don't unload the layout if it's installed actually.
  for (uint32_t i = 0; i < keyboardLayoutListCount; i++) {
    if (keyboardLayoutList[i] == loadedLayout) {
      loadedLayout = 0;
      break;
    }
  }
  if (keyboardLayoutListBuff != keyboardLayoutList) {
    delete [] keyboardLayoutList;
  }
  if (loadedLayout) {
    ::UnloadKeyboardLayout(loadedLayout);
  }
  return NS_OK;
}

/*****************************************************************************
 * mozilla::widget::DeadKeyTable
 *****************************************************************************/

char16_t
DeadKeyTable::GetCompositeChar(char16_t aBaseChar) const
{
  // Dead-key table is sorted by BaseChar in ascending order.
  // Usually they are too small to use binary search.

  for (uint32_t index = 0; index < mEntries; index++) {
    if (mTable[index].BaseChar == aBaseChar) {
      return mTable[index].CompositeChar;
    }
    if (mTable[index].BaseChar > aBaseChar) {
      break;
    }
  }

  return 0;
}

/*****************************************************************************
 * mozilla::widget::RedirectedKeyDownMessage
 *****************************************************************************/

MSG RedirectedKeyDownMessageManager::sRedirectedKeyDownMsg;
bool RedirectedKeyDownMessageManager::sDefaultPreventedOfRedirectedMsg = false;

// static
bool
RedirectedKeyDownMessageManager::IsRedirectedMessage(const MSG& aMsg)
{
  return (aMsg.message == WM_KEYDOWN || aMsg.message == WM_SYSKEYDOWN) &&
         (sRedirectedKeyDownMsg.message == aMsg.message &&
          WinUtils::GetScanCode(sRedirectedKeyDownMsg.lParam) ==
            WinUtils::GetScanCode(aMsg.lParam));
}

// static
void
RedirectedKeyDownMessageManager::RemoveNextCharMessage(HWND aWnd)
{
  MSG msg;
  if (WinUtils::PeekMessage(&msg, aWnd, WM_KEYFIRST, WM_KEYLAST,
                            PM_NOREMOVE | PM_NOYIELD) &&
      (msg.message == WM_CHAR || msg.message == WM_SYSCHAR)) {
    WinUtils::PeekMessage(&msg, aWnd, msg.message, msg.message,
                          PM_REMOVE | PM_NOYIELD);
  }
}

} // namespace widget
} // namespace mozilla