summaryrefslogtreecommitdiffstats
path: root/layout/generic/nsBlockFrame.h
blob: 4775fa6264d1bace6545302f94f5adead088a208 (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
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=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/. */

/*
 * rendering object for CSS display:block, inline-block, and list-item
 * boxes, also used for various anonymous boxes
 */

#ifndef nsBlockFrame_h___
#define nsBlockFrame_h___

#include "nsContainerFrame.h"
#include "nsHTMLParts.h"
#include "nsLineBox.h"
#include "nsCSSPseudoElements.h"
#include "nsFloatManager.h"

enum class LineReflowStatus {
  // The line was completely reflowed and fit in available width, and we should
  // try to pull up content from the next line if possible.
  OK,
  // The line was completely reflowed and fit in available width, but we should
  // not try to pull up content from the next line.
  Stop,
  // We need to reflow the line again at its current vertical position. The
  // new reflow should not try to pull up any frames from the next line.
  RedoNoPull,
  // We need to reflow the line again using the floats from its height
  // this reflow, since its height made it hit floats that were not
  // adjacent to its top.
  RedoMoreFloats,
  // We need to reflow the line again at a lower vertical postion where there
  // may be more horizontal space due to different float configuration.
  RedoNextBand,
  // The line did not fit in the available vertical space. Try pushing it to
  // the next page or column if it's not the first line on the current page/column.
  Truncated
};

class nsBlockInFlowLineIterator;
class nsBulletFrame;
namespace mozilla {
class BlockReflowInput;
} // namespace mozilla

/**
 * Some invariants:
 * -- The overflow out-of-flows list contains the out-of-
 * flow frames whose placeholders are in the overflow list.
 * -- A given piece of content has at most one placeholder
 * frame in a block's normal child list.
 * -- While a block is being reflowed, and from then until
 * its next-in-flow is reflowed it may have a
 * PushedFloatProperty frame property that points to
 * an nsFrameList. This list contains continuations for
 * floats whose prev-in-flow is in the block's regular float
 * list and first-in-flows of floats that did not fit, but
 * whose placeholders are in the block or one of its
 * prev-in-flows.
 * -- In all these frame lists, if there are two frames for
 * the same content appearing in the list, then the frames
 * appear with the prev-in-flow before the next-in-flow.
 * -- While reflowing a block, its overflow line list
 * will usually be empty but in some cases will have lines
 * (while we reflow the block at its shrink-wrap width).
 * In this case any new overflowing content must be
 * prepended to the overflow lines.
 */

/*
 * Base class for block and inline frames.
 * The block frame has an additional child list, kAbsoluteList, which
 * contains the absolutely positioned frames.
 */
class nsBlockFrame : public nsContainerFrame
{
  using BlockReflowInput = mozilla::BlockReflowInput;

public:
  NS_DECL_QUERYFRAME_TARGET(nsBlockFrame)
  NS_DECL_FRAMEARENA_HELPERS

  typedef nsLineList::iterator LineIterator;
  typedef nsLineList::const_iterator ConstLineIterator;
  typedef nsLineList::reverse_iterator ReverseLineIterator;
  typedef nsLineList::const_reverse_iterator ConstReverseLineIterator;

  LineIterator LinesBegin() { return mLines.begin(); }
  LineIterator LinesEnd() { return mLines.end(); }
  ConstLineIterator LinesBegin() const { return mLines.begin(); }
  ConstLineIterator LinesEnd() const { return mLines.end(); }
  ReverseLineIterator LinesRBegin() { return mLines.rbegin(); }
  ReverseLineIterator LinesREnd() { return mLines.rend(); }
  ConstReverseLineIterator LinesRBegin() const { return mLines.rbegin(); }
  ConstReverseLineIterator LinesREnd() const { return mLines.rend(); }
  LineIterator LinesBeginFrom(nsLineBox* aList) { return mLines.begin(aList); }
  ReverseLineIterator LinesRBeginFrom(nsLineBox* aList) { return mLines.rbegin(aList); }

  friend nsBlockFrame* NS_NewBlockFrame(nsIPresShell* aPresShell,
                                        nsStyleContext* aContext);

  // nsQueryFrame
  NS_DECL_QUERYFRAME

  // nsIFrame
  virtual void Init(nsIContent* aContent,
                    nsContainerFrame* aParent,
                    nsIFrame* aPrevInFlow) override;
  virtual void SetInitialChildList(ChildListID aListID,
                                   nsFrameList& aChildList) override;
  virtual void AppendFrames(ChildListID aListID,
                            nsFrameList& aFrameList) override;
  virtual void InsertFrames(ChildListID aListID,
                            nsIFrame* aPrevFrame,
                            nsFrameList& aFrameList) override;
  virtual void RemoveFrame(ChildListID aListID,
                           nsIFrame* aOldFrame) override;
  virtual const nsFrameList& GetChildList(ChildListID aListID) const override;
  virtual void GetChildLists(nsTArray<ChildList>* aLists) const override;
  virtual nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const override;
  bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
                                nscoord* aBaseline) const override
  {
    nscoord lastBaseline;
    if (GetNaturalBaselineBOffset(aWM, BaselineSharingGroup::eLast, &lastBaseline)) {
      *aBaseline = BSize() - lastBaseline;
      return true;
    }
    return false;
  }
  bool GetNaturalBaselineBOffset(mozilla::WritingMode aWM,
                                 BaselineSharingGroup aBaselineGroup,
                                 nscoord*             aBaseline) const override;
  virtual nscoord GetCaretBaseline() const override;
  virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
  virtual nsSplittableType GetSplittableType() const override;
  virtual bool IsFloatContainingBlock() const override;
  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                const nsDisplayListSet& aLists) override;
  virtual nsIAtom* GetType() const override;
  virtual bool IsFrameOfType(uint32_t aFlags) const override
  {
    return nsContainerFrame::IsFrameOfType(aFlags &
             ~(nsIFrame::eCanContainOverflowContainers |
               nsIFrame::eBlockFrame));
  }

  virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) override;
  virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) override;

#ifdef DEBUG_FRAME_DUMP
  void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const override;
  virtual nsresult GetFrameName(nsAString& aResult) const override;
#endif

#ifdef DEBUG
  virtual nsFrameState GetDebugStateBits() const override;
  const char* LineReflowStatusToString(LineReflowStatus aLineReflowStatus) const;
#endif

#ifdef ACCESSIBILITY
  virtual mozilla::a11y::AccType AccessibleType() override;
#endif

  // Line cursor methods to speed up line searching in which one query
  // result is expected to be close to the next in general. This is
  // mainly for searching line(s) containing a point. It is also used
  // as a cache for local computation. Use AutoLineCursorSetup for the
  // latter case so that it wouldn't interact unexpectedly with the
  // former. The basic idea for the former is that we set the cursor
  // property if the lines' overflowArea.VisualOverflow().ys and
  // overflowArea.VisualOverflow().yMosts are non-decreasing
  // (considering only non-empty overflowArea.VisualOverflow()s; empty
  // overflowArea.VisualOverflow()s never participate in event handling
  // or painting), and the block has sufficient number of lines. The
  // cursor property points to a "recently used" line. If we get a
  // series of requests that work on lines
  // "near" the cursor, then we can find those nearby lines quickly by
  // starting our search at the cursor.

  // Clear out line cursor because we're disturbing the lines (i.e., Reflow)
  void ClearLineCursor();
  // Get the first line that might contain y-coord 'y', or nullptr if you must search
  // all lines. If nonnull is returned then we guarantee that the lines'
  // combinedArea.ys and combinedArea.yMosts are non-decreasing.
  // The actual line returned might not contain 'y', but if not, it is guaranteed
  // to be before any line which does contain 'y'.
  nsLineBox* GetFirstLineContaining(nscoord y);
  // Set the line cursor to our first line. Only call this if you
  // guarantee that either the lines' combinedArea.ys and combinedArea.
  // yMosts are non-decreasing, or the line cursor is cleared before
  // building the display list of this frame.
  void SetupLineCursor();

  /**
   * Helper RAII class for automatically set and clear line cursor for
   * temporary use. If the frame already has line cursor, this would be
   * a no-op.
   */
  class MOZ_STACK_CLASS AutoLineCursorSetup
  {
  public:
    explicit AutoLineCursorSetup(nsBlockFrame* aFrame)
      : mFrame(aFrame)
      , mOrigCursor(aFrame->GetLineCursor())
    {
      if (!mOrigCursor) {
        mFrame->SetupLineCursor();
      }
    }
    ~AutoLineCursorSetup()
    {
      if (mOrigCursor) {
        mFrame->SetProperty(LineCursorProperty(), mOrigCursor);
      } else {
        mFrame->ClearLineCursor();
      }
    }

  private:
    nsBlockFrame* mFrame;
    nsLineBox* mOrigCursor;
  };

  virtual void ChildIsDirty(nsIFrame* aChild) override;
  virtual bool IsVisibleInSelection(nsISelection* aSelection) override;

  virtual bool IsEmpty() override;
  virtual bool CachedIsEmpty() override;
  virtual bool IsSelfEmpty() override;

  // Given that we have a bullet, does it actually draw something, i.e.,
  // do we have either a 'list-style-type' or 'list-style-image' that is
  // not 'none'?
  bool BulletIsEmpty() const;

  /**
   * Return the bullet text equivalent.
   */
  void GetSpokenBulletText(nsAString& aText) const;

  /**
   * Return true if there's a bullet.
   */
  bool HasBullet() const {
    return HasOutsideBullet() || HasInsideBullet();
  }

  /**
   * @return true if this frame has an inside bullet frame.
   */
  bool HasInsideBullet() const {
    return 0 != (mState & NS_BLOCK_FRAME_HAS_INSIDE_BULLET);
  }

  /**
   * @return true if this frame has an outside bullet frame.
   */
  bool HasOutsideBullet() const {
    return 0 != (mState & NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET);
  }

  /**
   * @return the bullet frame or nullptr if we don't have one.
   */
  nsBulletFrame* GetBullet() const {
    nsBulletFrame* outside = GetOutsideBullet();
    return outside ? outside : GetInsideBullet();
  }

  virtual void MarkIntrinsicISizesDirty() override;
private:
  void CheckIntrinsicCacheAgainstShrinkWrapState();
public:
  virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
  virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;

  virtual nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override;

  virtual nsresult GetPrefWidthTightBounds(nsRenderingContext* aContext,
                                           nscoord* aX,
                                           nscoord* aXMost) override;

  /**
   * Compute the final block size of this frame.
   *
   * @param aReflowInput Data structure passed from parent during reflow.
   * @param aReflowStatus A pointer to the reflow status for when we're finished
   *        doing reflow. this will get set appropriately if the block-size
   *        causes us to exceed the current available (page) block-size.
   * @param aContentBSize The block-size of content, precomputed outside of this
   *        function. The final block-size that is used in aMetrics will be set
   *        to either this or the available block-size, whichever is larger, in
   *        the case where our available block-size is constrained, and we
   *        overflow that available block-size.
   * @param aBorderPadding The margins representing the border padding for block
   *        frames. Can be 0.
   * @param aFinalSize Out parameter for final block-size.
   * @param aConsumed The block-size already consumed by our previous-in-flows.
   */
  void ComputeFinalBSize(const ReflowInput& aReflowInput,
                         nsReflowStatus* aStatus,
                         nscoord aContentBSize,
                         const mozilla::LogicalMargin& aBorderPadding,
                         mozilla::LogicalSize& aFinalSize,
                         nscoord aConsumed);

  virtual void Reflow(nsPresContext* aPresContext,
                      ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
                      nsReflowStatus& aStatus) override;

  virtual nsresult AttributeChanged(int32_t aNameSpaceID,
                                    nsIAtom* aAttribute,
                                    int32_t aModType) override;

  /**
   * Move any frames on our overflow list to the end of our principal list.
   * @return true if there were any overflow frames
   */
  virtual bool DrainSelfOverflowList() override;

  virtual nsresult StealFrame(nsIFrame* aChild) override;

  virtual void DeleteNextInFlowChild(nsIFrame* aNextInFlow,
                                     bool aDeletingEmptyFrames) override;

  /**
    * This is a special method that allows a child class of nsBlockFrame to
    * return a special, customized nsStyleText object to the nsLineLayout
    * constructor. It is used when the nsBlockFrame child needs to specify its
    * custom rendering style.
    */
  virtual const nsStyleText* StyleTextForLineLayout();

  /**
   * Determines whether the collapsed margin carried out of the last
   * line includes the margin-top of a line with clearance (in which
   * case we must avoid collapsing that margin with our bottom margin)
   */
  bool CheckForCollapsedBEndMarginFromClearanceLine();

  static nsresult GetCurrentLine(BlockReflowInput *aState, nsLineBox **aOutCurrentLine);

  /**
   * Determine if this block is a margin root at the top/bottom edges.
   */
  void IsMarginRoot(bool* aBStartMarginRoot, bool* aBEndMarginRoot);

  static bool BlockNeedsFloatManager(nsIFrame* aBlock);

  /**
   * Returns whether aFrame is a block frame that will wrap its contents
   * around floats intruding on it from the outside.  (aFrame need not
   * be a block frame, but if it's not, the result will be false.)
   */
  static bool BlockCanIntersectFloats(nsIFrame* aFrame);

  /**
   * Returns the inline size that needs to be cleared past floats for
   * blocks that cannot intersect floats.  aState must already have
   * GetAvailableSpace called on it for the block-dir position that we
   * care about (which need not be its current mBCoord)
   */
  struct ReplacedElementISizeToClear {
    // Note that we care about the inline-start margin but can ignore
    // the inline-end margin.
    nscoord marginIStart, borderBoxISize;
  };
  static ReplacedElementISizeToClear
    ISizeToClearPastFloats(const BlockReflowInput& aState,
                           const mozilla::LogicalRect& aFloatAvailableSpace,
                           nsIFrame* aFrame);

  /**
   * Creates a contination for aFloat and adds it to the list of overflow floats.
   * Also updates aState.mReflowStatus to include the float's incompleteness.
   * Must only be called while this block frame is in reflow.
   * aFloatStatus must be the float's true, unmodified reflow status.
   */
  nsresult SplitFloat(BlockReflowInput& aState,
                      nsIFrame* aFloat,
                      nsReflowStatus aFloatStatus);

  /**
   * Walks up the frame tree, starting with aCandidate, and returns the first
   * block frame that it encounters.
   */
  static nsBlockFrame* GetNearestAncestorBlock(nsIFrame* aCandidate);

  struct FrameLines {
    nsLineList mLines;
    nsFrameList mFrames;
  };

protected:
  explicit nsBlockFrame(nsStyleContext* aContext)
    : nsContainerFrame(aContext)
    , mMinWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
    , mPrefWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
  {
#ifdef DEBUG
  InitDebugFlags();
#endif
  }
  virtual ~nsBlockFrame();

#ifdef DEBUG
  already_AddRefed<nsStyleContext> GetFirstLetterStyle(nsPresContext* aPresContext);
#endif

  NS_DECLARE_FRAME_PROPERTY_WITHOUT_DTOR(LineCursorProperty, nsLineBox)
  bool HasLineCursor() { return GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR; }
  nsLineBox* GetLineCursor() {
    return HasLineCursor() ? GetProperty(LineCursorProperty()) : nullptr;
  }

  nsLineBox* NewLineBox(nsIFrame* aFrame, bool aIsBlock) {
    return NS_NewLineBox(PresContext()->PresShell(), aFrame, aIsBlock);
  }
  nsLineBox* NewLineBox(nsLineBox* aFromLine, nsIFrame* aFrame, int32_t aCount) {
    return NS_NewLineBox(PresContext()->PresShell(), aFromLine, aFrame, aCount);
  }
  void FreeLineBox(nsLineBox* aLine) {
    if (aLine == GetLineCursor()) {
      ClearLineCursor();
    }
    aLine->Destroy(PresContext()->PresShell());
  }
  /**
   * Helper method for StealFrame.
   */
  void RemoveFrameFromLine(nsIFrame* aChild, nsLineList::iterator aLine,
                           nsFrameList& aFrameList, nsLineList& aLineList);

  void TryAllLines(nsLineList::iterator* aIterator,
                   nsLineList::iterator* aStartIterator,
                   nsLineList::iterator* aEndIterator,
                   bool* aInOverflowLines,
                   FrameLines** aOverflowLines);

  /** move the frames contained by aLine by aDeltaBCoord
    * if aLine is a block, its child floats are added to the state manager
    */
  void SlideLine(BlockReflowInput& aState,
                 nsLineBox* aLine, nscoord aDeltaBCoord);

  void UpdateLineContainerSize(nsLineBox* aLine,
                               const nsSize& aNewContainerSize);

  // helper for SlideLine and UpdateLineContainerSize
  void MoveChildFramesOfLine(nsLineBox* aLine, nscoord aDeltaBCoord);

  void ComputeFinalSize(const ReflowInput& aReflowInput,
                        BlockReflowInput& aState,
                        ReflowOutput& aMetrics,
                        nscoord* aBottomEdgeOfChildren);

  void ComputeOverflowAreas(const nsRect& aBounds,
                            const nsStyleDisplay* aDisplay,
                            nscoord aBottomEdgeOfChildren,
                            nsOverflowAreas& aOverflowAreas);

  /**
   * Add the frames in aFrameList to this block after aPrevSibling.
   * This block thinks in terms of lines, but the frame construction code
   * knows nothing about lines at all so we need to find the line that
   * contains aPrevSibling and add aFrameList after aPrevSibling on that line.
   * New lines are created as necessary to handle block data in aFrameList.
   * This function will clear aFrameList.
   */
  void AddFrames(nsFrameList& aFrameList, nsIFrame* aPrevSibling);

  /**
   * Perform Bidi resolution on this frame
   */
  nsresult ResolveBidi();

  /**
   * Test whether the frame is a form control in a visual Bidi page.
   * This is necessary for backwards-compatibility, because most visual
   * pages use logical order for form controls so that they will
   * display correctly on native widgets in OSs with Bidi support
   * @param aPresContext the pres context
   * @return whether the frame is a BIDI form control
   */
  bool IsVisualFormControl(nsPresContext* aPresContext);

  /**
   * Helper function to create bullet frame.
   * @param aCreateBulletList true to create bullet list; otherwise number list.
   * @param aListStylePositionInside true to put the list position inside;
   * otherwise outside.
   */
  void CreateBulletFrameForListItem(bool aCreateBulletList,
                                    bool aListStylePositionInside);

public:
  /**
   * Does all the real work for removing aDeletedFrame
   * -- finds the line containing aDeletedFrame
   * -- removes all aDeletedFrame next-in-flows (or all continuations,
   * if REMOVE_FIXED_CONTINUATIONS is given)
   * -- marks lines dirty as needed
   * -- marks textruns dirty (unless FRAMES_ARE_EMPTY is given, in which
   * case textruns do not need to be dirtied)
   * -- destroys all removed frames
   */
  enum {
    REMOVE_FIXED_CONTINUATIONS = 0x02,
    FRAMES_ARE_EMPTY = 0x04
  };
  void DoRemoveFrame(nsIFrame* aDeletedFrame, uint32_t aFlags);

  void ReparentFloats(nsIFrame* aFirstFrame, nsBlockFrame* aOldParent,
                      bool aReparentSiblings);

  virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;

  virtual void UnionChildOverflow(nsOverflowAreas& aOverflowAreas) override;

  /** Load all of aFrame's floats into the float manager iff aFrame is not a
   *  block formatting context. Handles all necessary float manager translations;
   *  assumes float manager is in aFrame's parent's coord system.
   *  Safe to call on non-blocks (does nothing).
   */
  static void RecoverFloatsFor(nsIFrame* aFrame,
                               nsFloatManager& aFloatManager,
                               mozilla::WritingMode aWM,
                               const nsSize& aContainerSize);

  /**
   * Determine if we have any pushed floats from a previous continuation.
   *
   * @returns true, if any of the floats at the beginning of our mFloats list
   *          have the NS_FRAME_IS_PUSHED_FLOAT bit set; false otherwise.
   */
  bool HasPushedFloatsFromPrevContinuation() const {
    if (!mFloats.IsEmpty()) {
      // If we have pushed floats, then they should be at the beginning of our
      // float list.
      if (mFloats.FirstChild()->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT) {
        return true;
      }
    }

#ifdef DEBUG
    // Double-check the above assertion that pushed floats should be at the
    // beginning of our floats list.
    for (nsFrameList::Enumerator e(mFloats); !e.AtEnd(); e.Next()) {
      nsIFrame* f = e.get();
      NS_ASSERTION(!(f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT),
        "pushed floats must be at the beginning of the float list");
    }
#endif
    return false;
  }

  virtual bool RenumberChildFrames(int32_t* aOrdinal,
                                   int32_t aDepth,
                                   int32_t aIncrement,
                                   bool aForCounting) override;
protected:

  /** grab overflow lines from this block's prevInFlow, and make them
    * part of this block's mLines list.
    * @return true if any lines were drained.
    */
  bool DrainOverflowLines();

  /**
   * @return false iff this block does not have a float on any child list.
   * This function is O(1).
   */
  bool MaybeHasFloats() const {
    if (!mFloats.IsEmpty()) {
      return true;
    }
    // XXX this could be replaced with HasPushedFloats() if we enforced
    // removing the property when the frame list becomes empty.
    nsFrameList* list = GetPushedFloats();
    if (list && !list->IsEmpty()) {
      return true;
    }
    // For the OverflowOutOfFlowsProperty I think we do enforce that, but it's
    // a mix of out-of-flow frames, so that's why the method name has "Maybe".
    return GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS;
  }

  /**
   * Moves frames from our PushedFloats list back into our mFloats list.
   */
  void DrainSelfPushedFloats();

  /**
   * First calls DrainSelfPushedFloats() then grabs pushed floats from this
   * block's prev-in-flow, and splice them into this block's mFloats list too.
   */
  void DrainPushedFloats();

  /** Load all our floats into the float manager (without reflowing them).
   *  Assumes float manager is in our own coordinate system.
   */
  void RecoverFloats(nsFloatManager& aFloatManager,
                     mozilla::WritingMode aWM,
                     const nsSize& aContainerSize);

  /** Reflow pushed floats
   */
  void ReflowPushedFloats(BlockReflowInput& aState,
                          nsOverflowAreas& aOverflowAreas,
                          nsReflowStatus& aStatus);

  /** Find any trailing BR clear from the last line of the block (or its PIFs)
   */
  mozilla::StyleClear FindTrailingClear();

  /**
   * Remove a float from our float list.
   */
  void RemoveFloat(nsIFrame* aFloat);
  /**
   * Remove a float from the float cache for the line its placeholder is on.
   */
  void RemoveFloatFromFloatCache(nsIFrame* aFloat);

  void CollectFloats(nsIFrame* aFrame, nsFrameList& aList,
                     bool aCollectFromSiblings) {
    if (MaybeHasFloats()) {
      DoCollectFloats(aFrame, aList, aCollectFromSiblings);
    }
  }
  void DoCollectFloats(nsIFrame* aFrame, nsFrameList& aList,
                       bool aCollectFromSiblings);

  // Remove a float, abs, rel positioned frame from the appropriate block's list
  static void DoRemoveOutOfFlowFrame(nsIFrame* aFrame);

  /** set up the conditions necessary for an resize reflow
    * the primary task is to mark the minimumly sufficient lines dirty.
    */
  void PrepareResizeReflow(BlockReflowInput& aState);

  /** reflow all lines that have been marked dirty */
  void ReflowDirtyLines(BlockReflowInput& aState);

  /** Mark a given line dirty due to reflow being interrupted on or before it */
  void MarkLineDirtyForInterrupt(nsLineBox* aLine);

  //----------------------------------------
  // Methods for line reflow
  /**
   * Reflow a line.
   * @param aState           the current reflow state
   * @param aLine            the line to reflow.  can contain a single block frame
   *                         or contain 1 or more inline frames.
   * @param aKeepReflowGoing [OUT] indicates whether the caller should continue to reflow more lines
   */
  void ReflowLine(BlockReflowInput& aState,
                  LineIterator aLine,
                  bool* aKeepReflowGoing);

  // Return false if it needs another reflow because of reduced space
  // between floats that are next to it (but not next to its top), and
  // return true otherwise.
  bool PlaceLine(BlockReflowInput& aState,
                 nsLineLayout& aLineLayout,
                 LineIterator aLine,
                 nsFloatManager::SavedState* aFloatStateBeforeLine,
                 mozilla::LogicalRect& aFloatAvailableSpace, //in-out
                 nscoord& aAvailableSpaceBSize, // in-out
                 bool* aKeepReflowGoing);

  /**
    * If NS_BLOCK_LOOK_FOR_DIRTY_FRAMES is set, call MarkLineDirty
    * on any line with a child frame that is dirty.
    */
  void LazyMarkLinesDirty();

  /**
   * Mark |aLine| dirty, and, if necessary because of possible
   * pull-up, mark the previous line dirty as well. Also invalidates textruns
   * on those lines because the text in the lines might have changed due to
   * addition/removal of frames.
   * @param aLine the line to mark dirty
   * @param aLineList the line list containing that line
   */
  void MarkLineDirty(LineIterator aLine, const nsLineList* aLineList);

  // XXX where to go
  bool IsLastLine(BlockReflowInput& aState,
                  LineIterator aLine);

  void DeleteLine(BlockReflowInput& aState,
                  nsLineList::iterator aLine,
                  nsLineList::iterator aLineEnd);

  //----------------------------------------
  // Methods for individual frame reflow

  bool ShouldApplyBStartMargin(BlockReflowInput& aState,
                               nsLineBox* aLine,
                               nsIFrame* aChildFrame);

  void ReflowBlockFrame(BlockReflowInput& aState,
                        LineIterator aLine,
                        bool* aKeepGoing);

  void ReflowInlineFrames(BlockReflowInput& aState,
                          LineIterator aLine,
                          bool* aKeepLineGoing);

  void DoReflowInlineFrames(BlockReflowInput& aState,
                            nsLineLayout& aLineLayout,
                            LineIterator aLine,
                            nsFlowAreaRect& aFloatAvailableSpace,
                            nscoord& aAvailableSpaceBSize,
                            nsFloatManager::SavedState* aFloatStateBeforeLine,
                            bool* aKeepReflowGoing,
                            LineReflowStatus* aLineReflowStatus,
                            bool aAllowPullUp);

  void ReflowInlineFrame(BlockReflowInput& aState,
                         nsLineLayout& aLineLayout,
                         LineIterator aLine,
                         nsIFrame* aFrame,
                         LineReflowStatus* aLineReflowStatus);

  // Compute the available inline size for a float.
  mozilla::LogicalRect AdjustFloatAvailableSpace(
                         BlockReflowInput& aState,
                         const mozilla::LogicalRect& aFloatAvailableSpace,
                         nsIFrame* aFloatFrame);
  // Computes the border-box inline size of the float
  nscoord ComputeFloatISize(BlockReflowInput& aState,
                            const mozilla::LogicalRect& aFloatAvailableSpace,
                            nsIFrame* aFloat);
  // An incomplete aReflowStatus indicates the float should be split
  // but only if the available height is constrained.
  // aAdjustedAvailableSpace is the result of calling
  // nsBlockFrame::AdjustFloatAvailableSpace.
  void ReflowFloat(BlockReflowInput& aState,
                   const mozilla::LogicalRect& aAdjustedAvailableSpace,
                   nsIFrame* aFloat,
                   mozilla::LogicalMargin& aFloatMargin,
                   mozilla::LogicalMargin& aFloatOffsets,
                   // Whether the float's position
                   // (aAdjustedAvailableSpace) has been pushed down
                   // due to the presence of other floats.
                   bool aFloatPushedDown,
                   nsReflowStatus& aReflowStatus);

  //----------------------------------------
  // Methods for pushing/pulling lines/frames

  /**
   * Create a next-in-flow, if necessary, for aFrame. If a new frame is
   * created, place it in aLine if aLine is not null.
   * @param aState the block reflow state
   * @param aLine where to put a new frame
   * @param aFrame the frame
   * @return true if a new frame was created, false if not
   */
  bool CreateContinuationFor(BlockReflowInput& aState,
                             nsLineBox* aLine,
                             nsIFrame* aFrame);

  /**
   * Push aLine (and any after it), since it cannot be placed on this
   * page/column.  Set aKeepReflowGoing to false and set
   * flag aState.mReflowStatus as incomplete.
   */
  void PushTruncatedLine(BlockReflowInput& aState,
                         LineIterator aLine,
                         bool* aKeepReflowGoing);

  void SplitLine(BlockReflowInput& aState,
                 nsLineLayout& aLineLayout,
                 LineIterator aLine,
                 nsIFrame* aFrame,
                 LineReflowStatus* aLineReflowStatus);

  /**
   * Pull a frame from the next available location (one of our lines or
   * one of our next-in-flows lines).
   * @return the pulled frame or nullptr
   */
  nsIFrame* PullFrame(BlockReflowInput& aState,
                      LineIterator aLine);

  /**
   * Try to pull a frame out of a line pointed at by aFromLine.
   *
   * Note: pulling a frame from a line that is a place-holder frame
   * doesn't automatically remove the corresponding float from the
   * line's float array. This happens indirectly: either the line gets
   * emptied (and destroyed) or the line gets reflowed (because we mark
   * it dirty) and the code at the top of ReflowLine empties the
   * array. So eventually, it will be removed, just not right away.
   *
   * @return the pulled frame or nullptr
   */
  nsIFrame* PullFrameFrom(nsLineBox* aLine,
                          nsBlockFrame* aFromContainer,
                          nsLineList::iterator aFromLine);

  /**
   * Push the line after aLineBefore to the overflow line list.
   * @param aLineBefore a line in 'mLines' (or LinesBegin() when
   *        pushing the first line)
   */
  void PushLines(BlockReflowInput& aState,
                 nsLineList::iterator aLineBefore);

  void PropagateFloatDamage(BlockReflowInput& aState,
                            nsLineBox* aLine,
                            nscoord aDeltaBCoord);

  void CheckFloats(BlockReflowInput& aState);

  //----------------------------------------
  // List handling kludge

  void ReflowBullet(nsIFrame* aBulletFrame,
                    BlockReflowInput& aState,
                    ReflowOutput& aMetrics,
                    nscoord aLineTop);

  //----------------------------------------

  virtual nsILineIterator* GetLineIterator() override;

public:
  bool HasOverflowLines() const {
    return 0 != (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES);
  }
  FrameLines* GetOverflowLines() const;
protected:
  FrameLines* RemoveOverflowLines();
  void SetOverflowLines(FrameLines* aOverflowLines);
  void DestroyOverflowLines();

  /**
   * This class is useful for efficiently modifying the out of flow
   * overflow list. It gives the client direct writable access to
   * the frame list temporarily but ensures that property is only
   * written back if absolutely necessary.
   */
  struct nsAutoOOFFrameList {
    nsFrameList mList;

    explicit nsAutoOOFFrameList(nsBlockFrame* aBlock)
      : mPropValue(aBlock->GetOverflowOutOfFlows())
      , mBlock(aBlock) {
      if (mPropValue) {
        mList = *mPropValue;
      }
    }
    ~nsAutoOOFFrameList() {
      mBlock->SetOverflowOutOfFlows(mList, mPropValue);
    }
  protected:
    nsFrameList* const mPropValue;
    nsBlockFrame* const mBlock;
  };
  friend struct nsAutoOOFFrameList;

  nsFrameList* GetOverflowOutOfFlows() const;
  void SetOverflowOutOfFlows(const nsFrameList& aList, nsFrameList* aPropValue);

  /**
   * @return the inside bullet frame or nullptr if we don't have one.
   */
  nsBulletFrame* GetInsideBullet() const;

  /**
   * @return the outside bullet frame or nullptr if we don't have one.
   */
  nsBulletFrame* GetOutsideBullet() const;

  /**
   * @return the outside bullet frame list frame property.
   */
  nsFrameList* GetOutsideBulletList() const;

  /**
   * @return true if this frame has pushed floats.
   */
  bool HasPushedFloats() const {
    return 0 != (GetStateBits() & NS_BLOCK_HAS_PUSHED_FLOATS);
  }

  // Get the pushed floats list, which is used for *temporary* storage
  // of floats during reflow, between when we decide they don't fit in
  // this block until our next continuation takes them.
  nsFrameList* GetPushedFloats() const;
  // Get the pushed floats list, or if there is not currently one,
  // make a new empty one.
  nsFrameList* EnsurePushedFloats();
  // Remove and return the pushed floats list.
  nsFrameList* RemovePushedFloats();

#ifdef DEBUG
  void VerifyLines(bool aFinalCheckOK);
  void VerifyOverflowSituation();
  int32_t GetDepth() const;
#endif

  nscoord mMinWidth, mPrefWidth;

  nsLineList mLines;

  // List of all floats in this block
  // XXXmats blocks rarely have floats, make it a frame property
  nsFrameList mFloats;

  friend class mozilla::BlockReflowInput;
  friend class nsBlockInFlowLineIterator;

#ifdef DEBUG
public:
  static bool gLamePaintMetrics;
  static bool gLameReflowMetrics;
  static bool gNoisy;
  static bool gNoisyDamageRepair;
  static bool gNoisyIntrinsic;
  static bool gNoisyReflow;
  static bool gReallyNoisyReflow;
  static bool gNoisyFloatManager;
  static bool gVerifyLines;
  static bool gDisableResizeOpt;

  static int32_t gNoiseIndent;

  static const char* kReflowCommandType[];

protected:
  static void InitDebugFlags();
#endif
};

#ifdef DEBUG
class AutoNoisyIndenter {
public:
  explicit AutoNoisyIndenter(bool aDoIndent) : mIndented(aDoIndent) {
    if (mIndented) {
      nsBlockFrame::gNoiseIndent++;
    }
  }
  ~AutoNoisyIndenter() {
    if (mIndented) {
      nsBlockFrame::gNoiseIndent--;
    }
  }
private:
  bool mIndented;
};
#endif

/**
 * Iterates over all lines in the prev-in-flows/next-in-flows of this block.
 */
class nsBlockInFlowLineIterator {
public:
  typedef nsBlockFrame::LineIterator LineIterator;
  /**
   * Set up the iterator to point to aLine which must be a normal line
   * in aFrame (not an overflow line).
   */
  nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine);
  /**
   * Set up the iterator to point to the first line found starting from
   * aFrame. Sets aFoundValidLine to false if there is no such line.
   * After aFoundValidLine has returned false, don't call any methods on this
   * object again.
   */
  nsBlockInFlowLineIterator(nsBlockFrame* aFrame, bool* aFoundValidLine);
  /**
   * Set up the iterator to point to the line that contains aFindFrame (either
   * directly or indirectly).  If aFrame is out of flow, or contained in an
   * out-of-flow, finds the line containing the out-of-flow's placeholder. If
   * the frame is not found, sets aFoundValidLine to false. After
   * aFoundValidLine has returned false, don't call any methods on this
   * object again.
   */
  nsBlockInFlowLineIterator(nsBlockFrame* aFrame, nsIFrame* aFindFrame,
                            bool* aFoundValidLine);

  LineIterator GetLine() { return mLine; }
  bool IsLastLineInList();
  nsBlockFrame* GetContainer() { return mFrame; }
  bool GetInOverflow() { return mLineList != &mFrame->mLines; }

  /**
   * Returns the current line list we're iterating, null means
   * we're iterating |mLines| of the container.
   */
  nsLineList* GetLineList() { return mLineList; }

  /**
   * Returns the end-iterator of whatever line list we're in.
   */
  LineIterator End();

  /**
   * Returns false if there are no more lines. After this has returned false,
   * don't call any methods on this object again.
   */
  bool Next();
  /**
   * Returns false if there are no more lines. After this has returned false,
   * don't call any methods on this object again.
   */
  bool Prev();

private:
  friend class nsBlockFrame;
  friend class nsBidiPresUtils;
  // XXX nsBlockFrame uses this internally in one place.  Try to remove it.
  // XXX uhm, and nsBidiPresUtils::Resolve too.
  nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine, bool aInOverflow);

  nsBlockFrame* mFrame;
  LineIterator mLine;
  nsLineList* mLineList;  // the line list mLine is in

  /**
   * Moves iterator to next valid line reachable from the current block.
   * Returns false if there are no valid lines.
   */
  bool FindValidLine();
};

#endif /* nsBlockFrame_h___ */