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
|
/* -*- 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 "nsISupports.idl"
typedef long AccessibleTextBoundary;
interface nsIAccessible;
interface nsIArray;
interface nsIPersistentProperties;
interface nsIAccessibleTextRange;
[scriptable, builtinclass, uuid(93ad2ca1-f12b-4ab9-a793-95d9fa9d1774)]
interface nsIAccessibleText : nsISupports
{
// In parameters for character offsets:
// -1 will be treated as the equal to the end of the text
// -2 will be treated as the caret position
const int32_t TEXT_OFFSET_END_OF_TEXT = -1;
const int32_t TEXT_OFFSET_CARET = -2;
const AccessibleTextBoundary BOUNDARY_CHAR = 0;
const AccessibleTextBoundary BOUNDARY_WORD_START = 1;
const AccessibleTextBoundary BOUNDARY_WORD_END = 2;
const AccessibleTextBoundary BOUNDARY_SENTENCE_START = 3; // don't use, deprecated
const AccessibleTextBoundary BOUNDARY_SENTENCE_END = 4; // don't use, deprecated
const AccessibleTextBoundary BOUNDARY_LINE_START = 5;
const AccessibleTextBoundary BOUNDARY_LINE_END = 6;
/**
* The current current caret offset.
* If set < 0 then caret will be placed at the end of the text
*/
attribute long caretOffset;
readonly attribute long characterCount;
readonly attribute long selectionCount;
/**
* String methods may need to return multibyte-encoded strings,
* since some locales can't be encoded using 16-bit chars.
* So the methods below might return UTF-16 strings, or they could
* return "string" values which are UTF-8.
*/
AString getText (in long startOffset, in long endOffset);
AString getTextAfterOffset (in long offset,
in AccessibleTextBoundary boundaryType,
out long startOffset,
out long endOffset);
AString getTextAtOffset (in long offset,
in AccessibleTextBoundary boundaryType,
out long startOffset,
out long endOffset);
AString getTextBeforeOffset (in long offset,
in AccessibleTextBoundary boundaryType,
out long startOffset,
out long endOffset);
/**
* It would be better to return an unsigned long here,
* to allow unicode chars > 16 bits
*/
wchar getCharacterAtOffset (in long offset);
/**
* Get the accessible start/end offsets around the given offset,
* return the text attributes for this range of text.
*
* @param includeDefAttrs [in] points whether text attributes applied to
* the entire accessible should be included or not.
* @param offset [in] text offset
* @param rangeStartOffset [out] start offset of the range of text
* @param rangeEndOffset [out] end offset of the range of text
*/
nsIPersistentProperties getTextAttributes(in boolean includeDefAttrs,
in long offset,
out long rangeStartOffset,
out long rangeEndOffset);
/**
* Return the text attributes that apply to the entire accessible.
*/
readonly attribute nsIPersistentProperties defaultTextAttributes;
/**
* Returns the bounding box of the specified position.
*
* The virtual character after the last character of the represented text,
* i.e. the one at position length is a special case. It represents the
* current input position and will therefore typically be queried by AT more
* often than other positions. Because it does not represent an existing
* character its bounding box is defined in relation to preceding characters.
* It should be roughly equivalent to the bounding box of some character when
* inserted at the end of the text. Its height typically being the maximal
* height of all the characters in the text or the height of the preceding
* character, its width being at least one pixel so that the bounding box is
* not degenerate.
*
* @param offset - Index of the character for which to return its bounding
* box. The valid range is 0..length.
* @param x - X coordinate of the bounding box of the referenced character.
* @param y - Y coordinate of the bounding box of the referenced character.
* @param width - Width of the bounding box of the referenced character.
* @param height - Height of the bounding box of the referenced character.
* @param coordType - Specifies if the coordinates are relative to the screen
* or to the parent window (see constants declared in
* nsIAccessibleCoordinateType).
*/
void getCharacterExtents (in long offset,
out long x,
out long y,
out long width,
out long height,
in unsigned long coordType);
void getRangeExtents (in long startOffset,
in long endOffset,
out long x,
out long y,
out long width,
out long height,
in unsigned long coordType);
/**
* Get the text offset at the given point, or return -1
* if no character exists at that point
*
* @param x - The position's x value for which to look up the index of the
* character that is rendered on to the display at that point.
* @param y - The position's y value for which to look up the index of the
* character that is rendered on to the display at that point.
* @param coordType - Screen coordinates or window coordinates (see constants
* declared in nsIAccessibleCoordinateType).
* @return offset - Index of the character under the given point or -1 if
* the point is invalid or there is no character under
* the point.
*/
long getOffsetAtPoint (in long x, in long y,
in unsigned long coordType);
void getSelectionBounds (in long selectionNum,
out long startOffset,
out long endOffset);
/**
* Set the bounds for the given selection range
*/
void setSelectionBounds (in long selectionNum,
in long startOffset,
in long endOffset);
void addSelection (in long startOffset, in long endOffset);
void removeSelection (in long selectionNum);
/**
* Makes a specific part of string visible on screen.
*
* @param startIndex 0-based character offset
* @param endIndex 0-based character offset - the offset of the
* character just past the last character of the
* string
* @param scrollType defines how to scroll (see nsIAccessibleScrollType for
* available constants)
*/
void scrollSubstringTo(in long startIndex, in long endIndex,
in unsigned long scrollType);
/**
* Moves the top left of a substring to a specified location.
*
* @param startIndex 0-based character offset
* @param endIndex 0-based character offset - the offset of the
* character just past the last character of
* the string
* @param coordinateType specifies the coordinates origin (for available
* constants refer to nsIAccessibleCoordinateType)
* @param x defines the x coordinate
* @param y defines the y coordinate
*/
void scrollSubstringToPoint(in long startIndex, in long endIndex,
in unsigned long coordinateType,
in long x, in long y);
/**
* Return a range that encloses this text control or otherwise the document
* this text accessible belongs to.
*/
readonly attribute nsIAccessibleTextRange enclosingRange;
/**
* Return an array of disjoint ranges for selected text within the text control
* or otherwise the document this accessible belongs to.
*/
readonly attribute nsIArray selectionRanges;
/**
* Return an array of disjoint ranges of visible text within the text control
* or otherwise the document this accessible belongs to.
*/
readonly attribute nsIArray visibleRanges;
/**
* Return a range containing the given accessible.
*/
nsIAccessibleTextRange getRangeByChild(in nsIAccessible child);
/**
* Return a range containing an accessible at the given point.
*/
nsIAccessibleTextRange getRangeAtPoint(in long x, in long y);
};
/*
Assumptions:
Using wstring (UCS2) instead of string encoded in UTF-8.
Multibyte encodings (or at least potentially multi-byte
encodings) would be preferred for the reasons cited above.
The following methods will throw an exception on failure
(since not every text component will allow every operation):
setSelectionBounds, addSelection, removeSelection, setCaretOffset.
we assume that all text components support the idea of
a caret offset, whether visible or "virtual". If this
isn't the case, caretOffset can be made readonly and
a setCaretOffset method provided which throws an exception
on failure (as with *selection methods above).
*/
|
