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Issue 2864953002: Split out the MSCOM pieces of BrowserAccessibilityWin into a seperate class. (Closed)
Patch Set: Created 3 years, 7 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_ 5 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
6 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_ 6 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
7 7
8 #include <atlbase.h> 8 #include <atlbase.h>
9 #include <atlcom.h> 9 #include <atlcom.h>
10 #include <oleacc.h>
11 #include <stddef.h>
12 #include <stdint.h>
13 #include <UIAutomationCore.h>
14 10
15 #include <vector>
16
17 #include "base/compiler_specific.h"
18 #include "base/gtest_prod_util.h"
19 #include "base/macros.h"
20 #include "content/browser/accessibility/browser_accessibility.h" 11 #include "content/browser/accessibility/browser_accessibility.h"
12 #include "content/browser/accessibility/browser_accessibility_com_win.h"
21 #include "content/common/content_export.h" 13 #include "content/common/content_export.h"
22 #include "third_party/iaccessible2/ia2_api_all.h"
23 #include "third_party/isimpledom/ISimpleDOMDocument.h"
24 #include "third_party/isimpledom/ISimpleDOMNode.h"
25 #include "third_party/isimpledom/ISimpleDOMText.h"
26 #include "ui/accessibility/platform/ax_platform_node_win.h"
27 14
28 namespace content { 15 namespace content {
29 class BrowserAccessibilityRelation;
30 16
31 //////////////////////////////////////////////////////////////////////////////// 17 class CONTENT_EXPORT BrowserAccessibilityWin : public BrowserAccessibility {
32 //
33 // BrowserAccessibilityWin
34 //
35 // Class implementing the windows accessible interface for the Browser-Renderer
36 // communication of accessibility information, providing accessibility
37 // to be used by screen readers and other assistive technology (AT).
38 //
39 ////////////////////////////////////////////////////////////////////////////////
40 class __declspec(uuid("562072fe-3390-43b1-9e2c-dd4118f5ac79"))
41 BrowserAccessibilityWin
42 : public BrowserAccessibility,
43 public CComObjectRootEx<CComMultiThreadModel>,
44 public IDispatchImpl<IAccessible2, &IID_IAccessible2,
45 &LIBID_IAccessible2Lib>,
46 public IAccessibleApplication,
47 public IAccessibleHyperlink,
48 public IAccessibleHypertext,
49 public IAccessibleImage,
50 public IAccessibleTable,
51 public IAccessibleTable2,
52 public IAccessibleTableCell,
53 public IAccessibleValue,
54 public IServiceProvider,
55 public ISimpleDOMDocument,
56 public ISimpleDOMNode,
57 public ISimpleDOMText,
58 public IAccessibleEx,
59 public IRawElementProviderSimple {
60 public: 18 public:
61 BEGIN_COM_MAP(BrowserAccessibilityWin) 19 BrowserAccessibilityWin();
62 COM_INTERFACE_ENTRY2(IDispatch, IAccessible2) 20 ~BrowserAccessibilityWin() override;
63 COM_INTERFACE_ENTRY(IAccessible)
64 COM_INTERFACE_ENTRY(IAccessible2)
65 COM_INTERFACE_ENTRY(IAccessibleAction)
66 COM_INTERFACE_ENTRY(IAccessibleApplication)
67 COM_INTERFACE_ENTRY(IAccessibleEx)
68 COM_INTERFACE_ENTRY(IAccessibleHyperlink)
69 COM_INTERFACE_ENTRY(IAccessibleHypertext)
70 COM_INTERFACE_ENTRY(IAccessibleImage)
71 COM_INTERFACE_ENTRY(IAccessibleTable)
72 COM_INTERFACE_ENTRY(IAccessibleTable2)
73 COM_INTERFACE_ENTRY(IAccessibleTableCell)
74 COM_INTERFACE_ENTRY(IAccessibleText)
75 COM_INTERFACE_ENTRY(IAccessibleValue)
76 COM_INTERFACE_ENTRY(IRawElementProviderSimple)
77 COM_INTERFACE_ENTRY(IServiceProvider)
78 COM_INTERFACE_ENTRY(ISimpleDOMDocument)
79 COM_INTERFACE_ENTRY(ISimpleDOMNode)
80 COM_INTERFACE_ENTRY(ISimpleDOMText)
81 END_COM_MAP()
82
83 // Represents a non-static text node in IAccessibleHypertext. This character
84 // is embedded in the response to IAccessibleText::get_text, indicating the
85 // position where a non-static text child object appears.
86 CONTENT_EXPORT static const base::char16 kEmbeddedCharacter;
87
88 // Mappings from roles and states to human readable strings. Initialize
89 // with |InitializeStringMaps|.
90 static std::map<int32_t, base::string16> role_string_map;
91 static std::map<int32_t, base::string16> state_string_map;
92
93 CONTENT_EXPORT BrowserAccessibilityWin();
94
95 CONTENT_EXPORT ~BrowserAccessibilityWin() override;
96
97 // Called after an atomic tree update completes. See
98 // BrowserAccessibilityManagerWin::OnAtomicUpdateFinished for more
99 // details on what these do.
100 CONTENT_EXPORT void UpdateStep1ComputeWinAttributes();
101 CONTENT_EXPORT void UpdateStep2ComputeHypertext();
102 CONTENT_EXPORT void UpdateStep3FireEvents(bool is_subtree_creation);
103 21
104 // This is used to call UpdateStep1ComputeWinAttributes, ... above when 22 // This is used to call UpdateStep1ComputeWinAttributes, ... above when
105 // a node needs to be updated for some other reason other than via 23 // a node needs to be updated for some other reason other than via
106 // OnAtomicUpdateFinished. 24 // OnAtomicUpdateFinished.
107 CONTENT_EXPORT void UpdatePlatformAttributes() override; 25 void UpdatePlatformAttributes() override;
108 26
109 // 27 //
110 // BrowserAccessibility methods. 28 // BrowserAccessibility methods.
111 // 29 //
112 CONTENT_EXPORT void OnSubtreeWillBeDeleted() override; 30 void OnSubtreeWillBeDeleted() override;
113 CONTENT_EXPORT void NativeAddReference() override; 31 bool IsNative() const override;
114 CONTENT_EXPORT void NativeReleaseReference() override; 32 void Destroy() override;
115 CONTENT_EXPORT bool IsNative() const override; 33 void OnLocationChanged() override;
116 CONTENT_EXPORT void OnLocationChanged() override; 34 base::string16 GetText() const override;
117 35
118 // 36 class BrowserAccessibilityComWin* GetCOM() const;
119 // IAccessible methods.
120 //
121
122 // Performs the default action on a given object.
123 CONTENT_EXPORT STDMETHODIMP accDoDefaultAction(VARIANT var_id) override;
124
125 // Retrieves the child element or child object at a given point on the screen.
126 CONTENT_EXPORT STDMETHODIMP
127 accHitTest(LONG x_left, LONG y_top, VARIANT* child) override;
128
129 // Retrieves the specified object's current screen location.
130 CONTENT_EXPORT STDMETHODIMP accLocation(LONG* x_left,
131 LONG* y_top,
132 LONG* width,
133 LONG* height,
134 VARIANT var_id) override;
135
136 // Traverses to another UI element and retrieves the object.
137 CONTENT_EXPORT STDMETHODIMP
138 accNavigate(LONG nav_dir, VARIANT start, VARIANT* end) override;
139
140 // Retrieves an IDispatch interface pointer for the specified child.
141 CONTENT_EXPORT STDMETHODIMP
142 get_accChild(VARIANT var_child, IDispatch** disp_child) override;
143
144 // Retrieves the number of accessible children.
145 CONTENT_EXPORT STDMETHODIMP get_accChildCount(LONG* child_count) override;
146
147 // Retrieves a string that describes the object's default action.
148 CONTENT_EXPORT STDMETHODIMP
149 get_accDefaultAction(VARIANT var_id, BSTR* default_action) override;
150
151 // Retrieves the object's description.
152 CONTENT_EXPORT STDMETHODIMP
153 get_accDescription(VARIANT var_id, BSTR* desc) override;
154
155 // Retrieves the object that has the keyboard focus.
156 CONTENT_EXPORT STDMETHODIMP get_accFocus(VARIANT* focus_child) override;
157
158 // Retrieves the help information associated with the object.
159 CONTENT_EXPORT STDMETHODIMP get_accHelp(VARIANT var_id, BSTR* heflp) override;
160
161 // Retrieves the specified object's shortcut.
162 CONTENT_EXPORT STDMETHODIMP
163 get_accKeyboardShortcut(VARIANT var_id, BSTR* access_key) override;
164
165 // Retrieves the name of the specified object.
166 CONTENT_EXPORT STDMETHODIMP get_accName(VARIANT var_id, BSTR* name) override;
167
168 // Retrieves the IDispatch interface of the object's parent.
169 CONTENT_EXPORT STDMETHODIMP get_accParent(IDispatch** disp_parent) override;
170
171 // Retrieves information describing the role of the specified object.
172 CONTENT_EXPORT STDMETHODIMP
173 get_accRole(VARIANT var_id, VARIANT* role) override;
174
175 // Retrieves the current state of the specified object.
176 CONTENT_EXPORT STDMETHODIMP
177 get_accState(VARIANT var_id, VARIANT* state) override;
178
179 // Returns the value associated with the object.
180 CONTENT_EXPORT STDMETHODIMP
181 get_accValue(VARIANT var_id, BSTR* value) override;
182
183 // Make an object take focus or extend the selection.
184 CONTENT_EXPORT STDMETHODIMP
185 accSelect(LONG flags_sel, VARIANT var_id) override;
186
187 CONTENT_EXPORT STDMETHODIMP
188 get_accHelpTopic(BSTR* help_file, VARIANT var_id, LONG* topic_id) override;
189
190 CONTENT_EXPORT STDMETHODIMP get_accSelection(VARIANT* selected) override;
191
192 // Deprecated methods, not implemented.
193 CONTENT_EXPORT STDMETHODIMP
194 put_accName(VARIANT var_id, BSTR put_name) override;
195 CONTENT_EXPORT STDMETHODIMP
196 put_accValue(VARIANT var_id, BSTR put_val) override;
197
198 //
199 // IAccessible2 methods.
200 //
201
202 // Returns role from a longer list of possible roles.
203 CONTENT_EXPORT STDMETHODIMP role(LONG* role) override;
204
205 // Returns the state bitmask from a larger set of possible states.
206 CONTENT_EXPORT STDMETHODIMP get_states(AccessibleStates* states) override;
207
208 // Returns the attributes specific to this IAccessible2 object,
209 // such as a cell's formula.
210 CONTENT_EXPORT STDMETHODIMP get_attributes(BSTR* attributes) override;
211
212 // Get the unique ID of this object so that the client knows if it's
213 // been encountered previously.
214 CONTENT_EXPORT STDMETHODIMP get_uniqueID(LONG* unique_id) override;
215
216 // Get the window handle of the enclosing window.
217 CONTENT_EXPORT STDMETHODIMP get_windowHandle(HWND* window_handle) override;
218
219 // Get this object's index in its parent object.
220 CONTENT_EXPORT STDMETHODIMP get_indexInParent(LONG* index_in_parent) override;
221
222 CONTENT_EXPORT STDMETHODIMP get_nRelations(LONG* n_relations) override;
223
224 CONTENT_EXPORT STDMETHODIMP
225 get_relation(LONG relation_index, IAccessibleRelation** relation) override;
226
227 CONTENT_EXPORT STDMETHODIMP get_relations(LONG max_relations,
228 IAccessibleRelation** relations,
229 LONG* n_relations) override;
230
231 CONTENT_EXPORT STDMETHODIMP scrollTo(enum IA2ScrollType scroll_type) override;
232
233 CONTENT_EXPORT STDMETHODIMP
234 scrollToPoint(enum IA2CoordinateType coordinate_type,
235 LONG x,
236 LONG y) override;
237
238 CONTENT_EXPORT STDMETHODIMP
239 get_groupPosition(LONG* group_level,
240 LONG* similar_items_in_group,
241 LONG* position_in_group) override;
242
243 CONTENT_EXPORT STDMETHODIMP
244 get_localizedExtendedRole(BSTR* localized_extended_role) override;
245
246 //
247 // IAccessible2 methods not implemented.
248 //
249 CONTENT_EXPORT STDMETHODIMP get_extendedRole(BSTR* extended_role) override;
250 CONTENT_EXPORT STDMETHODIMP
251 get_nExtendedStates(LONG* n_extended_states) override;
252 CONTENT_EXPORT STDMETHODIMP
253 get_extendedStates(LONG max_extended_states,
254 BSTR** extended_states,
255 LONG* n_extended_states) override;
256 CONTENT_EXPORT STDMETHODIMP
257 get_localizedExtendedStates(LONG max_localized_extended_states,
258 BSTR** localized_extended_states,
259 LONG* n_localized_extended_states) override;
260 CONTENT_EXPORT STDMETHODIMP get_locale(IA2Locale* locale) override;
261
262 //
263 // IAccessibleApplication methods.
264 //
265 CONTENT_EXPORT STDMETHODIMP get_appName(BSTR* app_name) override;
266
267 CONTENT_EXPORT STDMETHODIMP get_appVersion(BSTR* app_version) override;
268
269 CONTENT_EXPORT STDMETHODIMP get_toolkitName(BSTR* toolkit_name) override;
270
271 CONTENT_EXPORT STDMETHODIMP
272 get_toolkitVersion(BSTR* toolkit_version) override;
273
274 //
275 // IAccessibleImage methods.
276 //
277 CONTENT_EXPORT STDMETHODIMP get_description(BSTR* description) override;
278
279 CONTENT_EXPORT STDMETHODIMP
280 get_imagePosition(enum IA2CoordinateType coordinate_type,
281 LONG* x,
282 LONG* y) override;
283
284 CONTENT_EXPORT STDMETHODIMP get_imageSize(LONG* height, LONG* width) override;
285
286 //
287 // IAccessibleTable methods.
288 //
289
290 // get_description - also used by IAccessibleImage
291
292 CONTENT_EXPORT STDMETHODIMP
293 get_accessibleAt(long row, long column, IUnknown** accessible) override;
294
295 CONTENT_EXPORT STDMETHODIMP get_caption(IUnknown** accessible) override;
296
297 CONTENT_EXPORT STDMETHODIMP
298 get_childIndex(long row_index, long column_index, long* cell_index) override;
299
300 CONTENT_EXPORT STDMETHODIMP
301 get_columnDescription(long column, BSTR* description) override;
302
303 CONTENT_EXPORT STDMETHODIMP
304 get_columnExtentAt(long row, long column, long* n_columns_spanned) override;
305
306 CONTENT_EXPORT STDMETHODIMP
307 get_columnHeader(IAccessibleTable** accessible_table,
308 long* starting_row_index) override;
309
310 CONTENT_EXPORT STDMETHODIMP
311 get_columnIndex(long cell_index, long* column_index) override;
312
313 CONTENT_EXPORT STDMETHODIMP get_nColumns(long* column_count) override;
314
315 CONTENT_EXPORT STDMETHODIMP get_nRows(long* row_count) override;
316
317 CONTENT_EXPORT STDMETHODIMP get_nSelectedChildren(long* cell_count) override;
318
319 CONTENT_EXPORT STDMETHODIMP get_nSelectedColumns(long* column_count) override;
320
321 CONTENT_EXPORT STDMETHODIMP get_nSelectedRows(long* row_count) override;
322
323 CONTENT_EXPORT STDMETHODIMP
324 get_rowDescription(long row, BSTR* description) override;
325
326 CONTENT_EXPORT STDMETHODIMP
327 get_rowExtentAt(long row, long column, long* n_rows_spanned) override;
328
329 CONTENT_EXPORT STDMETHODIMP
330 get_rowHeader(IAccessibleTable** accessible_table,
331 long* starting_column_index) override;
332
333 CONTENT_EXPORT STDMETHODIMP
334 get_rowIndex(long cell_index, long* row_index) override;
335
336 CONTENT_EXPORT STDMETHODIMP get_selectedChildren(long max_children,
337 long** children,
338 long* n_children) override;
339
340 CONTENT_EXPORT STDMETHODIMP get_selectedColumns(long max_columns,
341 long** columns,
342 long* n_columns) override;
343
344 CONTENT_EXPORT STDMETHODIMP
345 get_selectedRows(long max_rows, long** rows, long* n_rows) override;
346
347 CONTENT_EXPORT STDMETHODIMP get_summary(IUnknown** accessible) override;
348
349 CONTENT_EXPORT STDMETHODIMP
350 get_isColumnSelected(long column, boolean* is_selected) override;
351
352 CONTENT_EXPORT STDMETHODIMP
353 get_isRowSelected(long row, boolean* is_selected) override;
354
355 CONTENT_EXPORT STDMETHODIMP
356 get_isSelected(long row, long column, boolean* is_selected) override;
357
358 CONTENT_EXPORT STDMETHODIMP
359 get_rowColumnExtentsAtIndex(long index,
360 long* row,
361 long* column,
362 long* row_extents,
363 long* column_extents,
364 boolean* is_selected) override;
365
366 CONTENT_EXPORT STDMETHODIMP selectRow(long row) override;
367
368 CONTENT_EXPORT STDMETHODIMP selectColumn(long column) override;
369
370 CONTENT_EXPORT STDMETHODIMP unselectRow(long row) override;
371
372 CONTENT_EXPORT STDMETHODIMP unselectColumn(long column) override;
373
374 CONTENT_EXPORT STDMETHODIMP
375 get_modelChange(IA2TableModelChange* model_change) override;
376
377 //
378 // IAccessibleTable2 methods.
379 //
380 // (Most of these are duplicates of IAccessibleTable methods, only the
381 // unique ones are included here.)
382 //
383
384 CONTENT_EXPORT STDMETHODIMP
385 get_cellAt(long row, long column, IUnknown** cell) override;
386
387 CONTENT_EXPORT STDMETHODIMP get_nSelectedCells(long* cell_count) override;
388
389 CONTENT_EXPORT STDMETHODIMP
390 get_selectedCells(IUnknown*** cells, long* n_selected_cells) override;
391
392 CONTENT_EXPORT STDMETHODIMP
393 get_selectedColumns(long** columns, long* n_columns) override;
394
395 CONTENT_EXPORT STDMETHODIMP
396 get_selectedRows(long** rows, long* n_rows) override;
397
398 //
399 // IAccessibleTableCell methods.
400 //
401
402 CONTENT_EXPORT STDMETHODIMP
403 get_columnExtent(long* n_columns_spanned) override;
404
405 CONTENT_EXPORT STDMETHODIMP
406 get_columnHeaderCells(IUnknown*** cell_accessibles,
407 long* n_column_header_cells) override;
408
409 CONTENT_EXPORT STDMETHODIMP get_columnIndex(long* column_index) override;
410
411 CONTENT_EXPORT STDMETHODIMP get_rowExtent(long* n_rows_spanned) override;
412
413 CONTENT_EXPORT STDMETHODIMP
414 get_rowHeaderCells(IUnknown*** cell_accessibles,
415 long* n_row_header_cells) override;
416
417 CONTENT_EXPORT STDMETHODIMP get_rowIndex(long* row_index) override;
418
419 CONTENT_EXPORT STDMETHODIMP get_isSelected(boolean* is_selected) override;
420
421 CONTENT_EXPORT STDMETHODIMP
422 get_rowColumnExtents(long* row,
423 long* column,
424 long* row_extents,
425 long* column_extents,
426 boolean* is_selected) override;
427
428 CONTENT_EXPORT STDMETHODIMP get_table(IUnknown** table) override;
429
430 //
431 // IAccessibleText methods.
432 //
433
434 CONTENT_EXPORT STDMETHODIMP get_nCharacters(LONG* n_characters) override;
435
436 CONTENT_EXPORT STDMETHODIMP get_caretOffset(LONG* offset) override;
437
438 CONTENT_EXPORT STDMETHODIMP
439 get_characterExtents(LONG offset,
440 enum IA2CoordinateType coord_type,
441 LONG* out_x,
442 LONG* out_y,
443 LONG* out_width,
444 LONG* out_height) override;
445
446 CONTENT_EXPORT STDMETHODIMP get_nSelections(LONG* n_selections) override;
447
448 CONTENT_EXPORT STDMETHODIMP get_selection(LONG selection_index,
449 LONG* start_offset,
450 LONG* end_offset) override;
451
452 CONTENT_EXPORT STDMETHODIMP
453 get_text(LONG start_offset, LONG end_offset, BSTR* text) override;
454
455 CONTENT_EXPORT STDMETHODIMP
456 get_textAtOffset(LONG offset,
457 enum IA2TextBoundaryType boundary_type,
458 LONG* start_offset,
459 LONG* end_offset,
460 BSTR* text) override;
461
462 CONTENT_EXPORT STDMETHODIMP
463 get_textBeforeOffset(LONG offset,
464 enum IA2TextBoundaryType boundary_type,
465 LONG* start_offset,
466 LONG* end_offset,
467 BSTR* text) override;
468
469 CONTENT_EXPORT STDMETHODIMP
470 get_textAfterOffset(LONG offset,
471 enum IA2TextBoundaryType boundary_type,
472 LONG* start_offset,
473 LONG* end_offset,
474 BSTR* text) override;
475
476 CONTENT_EXPORT STDMETHODIMP get_newText(IA2TextSegment* new_text) override;
477
478 CONTENT_EXPORT STDMETHODIMP get_oldText(IA2TextSegment* old_text) override;
479
480 CONTENT_EXPORT STDMETHODIMP
481 get_offsetAtPoint(LONG x,
482 LONG y,
483 enum IA2CoordinateType coord_type,
484 LONG* offset) override;
485
486 CONTENT_EXPORT STDMETHODIMP
487 scrollSubstringTo(LONG start_index,
488 LONG end_index,
489 enum IA2ScrollType scroll_type) override;
490
491 CONTENT_EXPORT STDMETHODIMP
492 scrollSubstringToPoint(LONG start_index,
493 LONG end_index,
494 enum IA2CoordinateType coordinate_type,
495 LONG x,
496 LONG y) override;
497
498 CONTENT_EXPORT STDMETHODIMP
499 addSelection(LONG start_offset, LONG end_offset) override;
500
501 CONTENT_EXPORT STDMETHODIMP removeSelection(LONG selection_index) override;
502
503 CONTENT_EXPORT STDMETHODIMP setCaretOffset(LONG offset) override;
504
505 CONTENT_EXPORT STDMETHODIMP setSelection(LONG selection_index,
506 LONG start_offset,
507 LONG end_offset) override;
508
509 // IAccessibleText methods not implemented.
510 CONTENT_EXPORT STDMETHODIMP get_attributes(LONG offset,
511 LONG* start_offset,
512 LONG* end_offset,
513 BSTR* text_attributes) override;
514
515 //
516 // IAccessibleHypertext methods.
517 //
518
519 CONTENT_EXPORT STDMETHODIMP get_nHyperlinks(long* hyperlink_count) override;
520
521 CONTENT_EXPORT STDMETHODIMP
522 get_hyperlink(long index, IAccessibleHyperlink** hyperlink) override;
523
524 CONTENT_EXPORT STDMETHODIMP
525 get_hyperlinkIndex(long char_index, long* hyperlink_index) override;
526
527 // IAccessibleHyperlink methods.
528 CONTENT_EXPORT STDMETHODIMP get_anchor(long index, VARIANT* anchor) override;
529 CONTENT_EXPORT STDMETHODIMP get_anchorTarget(long index,
530 VARIANT* anchor_target) override;
531 CONTENT_EXPORT STDMETHODIMP get_startIndex(long* index) override;
532 CONTENT_EXPORT STDMETHODIMP get_endIndex(long* index) override;
533 // This method is deprecated in the IA2 Spec and so we don't implement it.
534 CONTENT_EXPORT STDMETHODIMP get_valid(boolean* valid) override;
535
536 // IAccessibleAction mostly not implemented.
537 CONTENT_EXPORT STDMETHODIMP nActions(long* n_actions) override;
538 CONTENT_EXPORT STDMETHODIMP doAction(long action_index) override;
539 CONTENT_EXPORT STDMETHODIMP
540 get_description(long action_index, BSTR* description) override;
541 CONTENT_EXPORT STDMETHODIMP get_keyBinding(long action_index,
542 long n_max_bindings,
543 BSTR** key_bindings,
544 long* n_bindings) override;
545 CONTENT_EXPORT STDMETHODIMP get_name(long action_index, BSTR* name) override;
546 CONTENT_EXPORT STDMETHODIMP
547 get_localizedName(long action_index, BSTR* localized_name) override;
548
549 //
550 // IAccessibleValue methods.
551 //
552
553 CONTENT_EXPORT STDMETHODIMP get_currentValue(VARIANT* value) override;
554
555 CONTENT_EXPORT STDMETHODIMP get_minimumValue(VARIANT* value) override;
556
557 CONTENT_EXPORT STDMETHODIMP get_maximumValue(VARIANT* value) override;
558
559 CONTENT_EXPORT STDMETHODIMP setCurrentValue(VARIANT new_value) override;
560
561 //
562 // ISimpleDOMDocument methods.
563 //
564
565 CONTENT_EXPORT STDMETHODIMP get_URL(BSTR* url) override;
566
567 CONTENT_EXPORT STDMETHODIMP get_title(BSTR* title) override;
568
569 CONTENT_EXPORT STDMETHODIMP get_mimeType(BSTR* mime_type) override;
570
571 CONTENT_EXPORT STDMETHODIMP get_docType(BSTR* doc_type) override;
572
573 CONTENT_EXPORT STDMETHODIMP
574 get_nameSpaceURIForID(short name_space_id, BSTR* name_space_uri) override;
575 CONTENT_EXPORT STDMETHODIMP
576 put_alternateViewMediaTypes(BSTR* comma_separated_media_types) override;
577
578 //
579 // ISimpleDOMNode methods.
580 //
581
582 CONTENT_EXPORT STDMETHODIMP get_nodeInfo(BSTR* node_name,
583 short* name_space_id,
584 BSTR* node_value,
585 unsigned int* num_children,
586 unsigned int* unique_id,
587 unsigned short* node_type) override;
588
589 CONTENT_EXPORT STDMETHODIMP
590 get_attributes(unsigned short max_attribs,
591 BSTR* attrib_names,
592 short* name_space_id,
593 BSTR* attrib_values,
594 unsigned short* num_attribs) override;
595
596 CONTENT_EXPORT STDMETHODIMP
597 get_attributesForNames(unsigned short num_attribs,
598 BSTR* attrib_names,
599 short* name_space_id,
600 BSTR* attrib_values) override;
601
602 CONTENT_EXPORT STDMETHODIMP
603 get_computedStyle(unsigned short max_style_properties,
604 boolean use_alternate_view,
605 BSTR* style_properties,
606 BSTR* style_values,
607 unsigned short* num_style_properties) override;
608
609 CONTENT_EXPORT STDMETHODIMP
610 get_computedStyleForProperties(unsigned short num_style_properties,
611 boolean use_alternate_view,
612 BSTR* style_properties,
613 BSTR* style_values) override;
614
615 CONTENT_EXPORT STDMETHODIMP scrollTo(boolean placeTopLeft) override;
616
617 CONTENT_EXPORT STDMETHODIMP get_parentNode(ISimpleDOMNode** node) override;
618
619 CONTENT_EXPORT STDMETHODIMP get_firstChild(ISimpleDOMNode** node) override;
620
621 CONTENT_EXPORT STDMETHODIMP get_lastChild(ISimpleDOMNode** node) override;
622
623 CONTENT_EXPORT STDMETHODIMP
624 get_previousSibling(ISimpleDOMNode** node) override;
625
626 CONTENT_EXPORT STDMETHODIMP get_nextSibling(ISimpleDOMNode** node) override;
627
628 CONTENT_EXPORT STDMETHODIMP
629 get_childAt(unsigned int child_index, ISimpleDOMNode** node) override;
630
631 CONTENT_EXPORT STDMETHODIMP get_innerHTML(BSTR* innerHTML) override;
632
633 CONTENT_EXPORT STDMETHODIMP
634 get_localInterface(void** local_interface) override;
635
636 CONTENT_EXPORT STDMETHODIMP get_language(BSTR* language) override;
637
638 //
639 // ISimpleDOMText methods.
640 //
641
642 CONTENT_EXPORT STDMETHODIMP get_domText(BSTR* dom_text) override;
643
644 CONTENT_EXPORT STDMETHODIMP
645 get_clippedSubstringBounds(unsigned int start_index,
646 unsigned int end_index,
647 int* out_x,
648 int* out_y,
649 int* out_width,
650 int* out_height) override;
651
652 CONTENT_EXPORT STDMETHODIMP
653 get_unclippedSubstringBounds(unsigned int start_index,
654 unsigned int end_index,
655 int* out_x,
656 int* out_y,
657 int* out_width,
658 int* out_height) override;
659
660 CONTENT_EXPORT STDMETHODIMP
661 scrollToSubstring(unsigned int start_index, unsigned int end_index) override;
662
663 CONTENT_EXPORT STDMETHODIMP get_fontFamily(BSTR* font_family) override;
664
665 //
666 // IServiceProvider methods.
667 //
668
669 CONTENT_EXPORT STDMETHODIMP
670 QueryService(REFGUID guidService, REFIID riid, void** object) override;
671
672 // IAccessibleEx methods not implemented.
673 CONTENT_EXPORT STDMETHODIMP
674 GetObjectForChild(long child_id, IAccessibleEx** ret) override;
675
676 CONTENT_EXPORT STDMETHODIMP
677 GetIAccessiblePair(IAccessible** acc, long* child_id) override;
678
679 CONTENT_EXPORT STDMETHODIMP GetRuntimeId(SAFEARRAY** runtime_id) override;
680
681 CONTENT_EXPORT STDMETHODIMP
682 ConvertReturnedElement(IRawElementProviderSimple* element,
683 IAccessibleEx** acc) override;
684
685 //
686 // IRawElementProviderSimple methods.
687 //
688 // The GetPatternProvider/GetPropertyValue methods need to be implemented for
689 // the on-screen keyboard to show up in Windows 8 metro.
690 CONTENT_EXPORT STDMETHODIMP
691 GetPatternProvider(PATTERNID id, IUnknown** provider) override;
692 CONTENT_EXPORT STDMETHODIMP
693 GetPropertyValue(PROPERTYID id, VARIANT* ret) override;
694
695 //
696 // IRawElementProviderSimple methods not implemented
697 //
698 CONTENT_EXPORT STDMETHODIMP
699 get_ProviderOptions(enum ProviderOptions* ret) override;
700 CONTENT_EXPORT STDMETHODIMP
701 get_HostRawElementProvider(IRawElementProviderSimple** provider) override;
702
703 //
704 // CComObjectRootEx methods.
705 //
706
707 // Called by BEGIN_COM_MAP() / END_COM_MAP().
708 static CONTENT_EXPORT HRESULT WINAPI
709 InternalQueryInterface(void* this_ptr,
710 const _ATL_INTMAP_ENTRY* entries,
711 REFIID iid,
712 void** object);
713
714 // Computes and caches the IA2 text style attributes for the text and other
715 // embedded child objects.
716 CONTENT_EXPORT void ComputeStylesIfNeeded();
717
718 // |offset| could either be a text character or a child index in case of
719 // non-text objects.
720 AXPlatformPosition::AXPositionInstance CreatePositionForSelectionAt(
721 int offset) const;
722
723 CONTENT_EXPORT base::string16 GetText() const override;
724
725 // Accessors.
726 int32_t ia_role() const { return win_attributes_->ia_role; }
727 int32_t ia_state() const { return win_attributes_->ia_state; }
728 const base::string16& role_name() const { return win_attributes_->role_name; }
729 int32_t ia2_role() const { return win_attributes_->ia2_role; }
730 int32_t ia2_state() const { return win_attributes_->ia2_state; }
731 const std::vector<base::string16>& ia2_attributes() const {
732 return win_attributes_->ia2_attributes;
733 }
734 base::string16 name() const { return win_attributes_->name; }
735 base::string16 description() const { return win_attributes_->description; }
736 base::string16 value() const { return win_attributes_->value; }
737 const std::map<int, std::vector<base::string16>>& offset_to_text_attributes()
738 const {
739 return win_attributes_->offset_to_text_attributes;
740 }
741 std::map<int32_t, int32_t>& hyperlink_offset_to_index() const {
742 return win_attributes_->hyperlink_offset_to_index;
743 }
744 std::vector<int32_t>& hyperlinks() const {
745 return win_attributes_->hyperlinks;
746 }
747 37
748 private: 38 private:
749 // Returns the IA2 text attributes for this object. 39 CComObject<BrowserAccessibilityComWin>* browser_accessibility_com_;
750 std::vector<base::string16> ComputeTextAttributes() const;
751
752 // Add one to the reference count and return the same object. Always
753 // use this method when returning a BrowserAccessibilityWin object as
754 // an output parameter to a COM interface, never use it otherwise.
755 BrowserAccessibilityWin* NewReference();
756
757 // Returns a list of IA2 attributes indicating the offsets in the text of a
758 // leaf object, such as a text field or static text, where spelling errors are
759 // present.
760 std::map<int, std::vector<base::string16>> GetSpellingAttributes() const;
761
762 // Many MSAA methods take a var_id parameter indicating that the operation
763 // should be performed on a particular child ID, rather than this object.
764 // This method tries to figure out the target object from |var_id| and
765 // returns a pointer to the target object if it exists, otherwise NULL.
766 // Does not return a new reference.
767 BrowserAccessibilityWin* GetTargetFromChildID(const VARIANT& var_id);
768
769 // Initialize the role and state metadata from the role enum and state
770 // bitmasks defined in ui::AXNodeData.
771 void InitRoleAndState();
772
773 // Retrieve the value of an attribute from the string attribute map and
774 // if found and nonempty, allocate a new BSTR (with SysAllocString)
775 // and return S_OK. If not found or empty, return S_FALSE.
776 HRESULT GetStringAttributeAsBstr(
777 ui::AXStringAttribute attribute,
778 BSTR* value_bstr);
779
780 // Escapes characters in string attributes as required by the IA2 Spec.
781 // It's okay for input to be the same as output.
782 CONTENT_EXPORT static void SanitizeStringAttributeForIA2(
783 const base::string16& input,
784 base::string16* output);
785 FRIEND_TEST_ALL_PREFIXES(BrowserAccessibilityTest,
786 TestSanitizeStringAttributeForIA2);
787
788 // Sets the selection given a start and end offset in IA2 Hypertext.
789 void SetIA2HypertextSelection(LONG start_offset, LONG end_offset);
790
791 // If the string attribute |attribute| is present, add its value as an
792 // IAccessible2 attribute with the name |ia2_attr|.
793 void StringAttributeToIA2(ui::AXStringAttribute attribute,
794 const char* ia2_attr);
795
796 // If the bool attribute |attribute| is present, add its value as an
797 // IAccessible2 attribute with the name |ia2_attr|.
798 void BoolAttributeToIA2(ui::AXBoolAttribute attribute,
799 const char* ia2_attr);
800
801 // If the int attribute |attribute| is present, add its value as an
802 // IAccessible2 attribute with the name |ia2_attr|.
803 void IntAttributeToIA2(ui::AXIntAttribute attribute,
804 const char* ia2_attr);
805
806 //
807 // Helper methods for IA2 hyperlinks.
808 //
809 // Hyperlink is an IA2 misnomer. It refers to objects embedded within other
810 // objects, such as a numbered list within a contenteditable div.
811 // Also, in IA2, text that includes embedded objects is called hypertext.
812
813 // Returns true if the current object is an IA2 hyperlink.
814 bool IsHyperlink() const;
815 // Returns the hyperlink at the given text position, or nullptr if no
816 // hyperlink can be found.
817 BrowserAccessibilityWin* GetHyperlinkFromHypertextOffset(int offset) const;
818
819 // Functions for retrieving offsets for hyperlinks and hypertext.
820 // Return -1 in case of failure.
821 int32_t GetHyperlinkIndexFromChild(
822 const BrowserAccessibilityWin& child) const;
823 int32_t GetHypertextOffsetFromHyperlinkIndex(int32_t hyperlink_index) const;
824 int32_t GetHypertextOffsetFromChild(
825 const BrowserAccessibilityWin& child) const;
826 int32_t GetHypertextOffsetFromDescendant(
827 const BrowserAccessibilityWin& descendant) const;
828
829 // If the selection endpoint is either equal to or an ancestor of this object,
830 // returns endpoint_offset.
831 // If the selection endpoint is a descendant of this object, returns its
832 // offset. Otherwise, returns either 0 or the length of the hypertext
833 // depending on the direction of the selection.
834 // Returns -1 in case of unexpected failure, e.g. the selection endpoint
835 // cannot be found in the accessibility tree.
836 int GetHypertextOffsetFromEndpoint(
837 const BrowserAccessibilityWin& endpoint_object,
838 int endpoint_offset) const;
839
840 //
841 // Selection helper functions.
842 //
843 // The following functions retrieve the endpoints of the current selection.
844 // First they check for a local selection found on the current control, e.g.
845 // when querying the selection on a textarea.
846 // If not found they retrieve the global selection found on the current frame.
847 int GetSelectionAnchor() const;
848 int GetSelectionFocus() const;
849 // Retrieves the selection offsets in the way required by the IA2 APIs.
850 // selection_start and selection_end are -1 when there is no selection active
851 // on this object.
852 // The greatest of the two offsets is one past the last character of the
853 // selection.)
854 void GetSelectionOffsets(int* selection_start, int* selection_end) const;
855
856 // Get the value text, which might come from the floating-point
857 // value for some roles.
858 base::string16 GetValueText();
859
860 bool IsSameHypertextCharacter(size_t old_char_index, size_t new_char_index);
861 void ComputeHypertextRemovedAndInserted(
862 int* start, int* old_len, int* new_len);
863
864 // If offset is a member of IA2TextSpecialOffsets this function updates the
865 // value of offset and returns, otherwise offset remains unchanged.
866 void HandleSpecialTextOffset(LONG* offset);
867
868 // Convert from a IA2TextBoundaryType to a ui::TextBoundaryType.
869 ui::TextBoundaryType IA2TextBoundaryToTextBoundary(IA2TextBoundaryType type);
870
871 // Search forwards (direction == 1) or backwards (direction == -1)
872 // from the given offset until the given boundary is found, and
873 // return the offset of that boundary.
874 LONG FindBoundary(const base::string16& text,
875 IA2TextBoundaryType ia2_boundary,
876 LONG start_offset,
877 ui::TextBoundaryDirection direction);
878
879 // Searches forward from the given offset until the start of the next style
880 // is found, or searches backward from the given offset until the start of the
881 // current style is found.
882 LONG FindStartOfStyle(LONG start_offset,
883 ui::TextBoundaryDirection direction) const;
884
885 // ID refers to the node ID in the current tree, not the globally unique ID.
886 // TODO(nektar): Could we use globally unique IDs everywhere?
887 // TODO(nektar): Rename this function to GetFromNodeID.
888 BrowserAccessibilityWin* GetFromID(int32_t id) const;
889
890 // Returns true if this is a list box option with a parent of type list box,
891 // or a menu list option with a parent of type menu list popup.
892 bool IsListBoxOptionOrMenuListOption();
893
894 // For adding / removing IA2 relations.
895
896 void AddRelation(const base::string16& relation_type, int target_id);
897 void AddBidirectionalRelations(const base::string16& relation_type,
898 const base::string16& reverse_relation_type,
899 ui::AXIntListAttribute attribute);
900 // Clears all the forward relations from this object to any other object and
901 // the associated reverse relations on the other objects, but leaves any
902 // reverse relations on this object alone.
903 void ClearOwnRelations();
904 void RemoveBidirectionalRelationsOfType(
905 const base::string16& relation_type,
906 const base::string16& reverse_relation_type);
907 void RemoveTargetFromRelation(const base::string16& relation_type,
908 int target_id);
909
910 // Updates object attributes of IA2 with html attributes.
911 void UpdateRequiredAttributes();
912
913 // Fire a Windows-specific accessibility event notification on this node.
914 void FireNativeEvent(LONG win_event_type) const;
915
916 ui::AXPlatformNodeWin* GetPlatformNodeWin() const;
917
918 static bool IsInTreeGrid(const BrowserAccessibility* item);
919
920 struct WinAttributes {
921 WinAttributes();
922 ~WinAttributes();
923
924 // IAccessible role and state.
925 int32_t ia_role;
926 int32_t ia_state;
927 base::string16 role_name;
928
929 // IAccessible name, description, help, value.
930 base::string16 name;
931 base::string16 description;
932 base::string16 value;
933
934 // IAccessible2 role and state.
935 int32_t ia2_role;
936 int32_t ia2_state;
937
938 // IAccessible2 attributes.
939 std::vector<base::string16> ia2_attributes;
940
941 // Hypertext.
942 base::string16 hypertext;
943
944 // Maps each style span to its start offset in hypertext.
945 std::map<int, std::vector<base::string16>> offset_to_text_attributes;
946
947 // Maps an embedded character offset in |hypertext_| to an index in
948 // |hyperlinks_|.
949 std::map<int32_t, int32_t> hyperlink_offset_to_index;
950
951 // The unique id of a BrowserAccessibilityWin for each hyperlink.
952 // TODO(nektar): Replace object IDs with child indices if we decide that
953 // we are not implementing IA2 hyperlinks for anything other than IA2
954 // Hypertext.
955 std::vector<int32_t> hyperlinks;
956 };
957
958 std::unique_ptr<WinAttributes> win_attributes_;
959
960 // Only valid during the scope of a IA2_EVENT_TEXT_REMOVED or
961 // IA2_EVENT_TEXT_INSERTED event.
962 std::unique_ptr<WinAttributes> old_win_attributes_;
963
964 // Relationships between this node and other nodes.
965 std::vector<BrowserAccessibilityRelation*> relations_;
966
967 // The previous scroll position, so we can tell if this object scrolled.
968 int previous_scroll_x_;
969 int previous_scroll_y_;
970
971 // Give BrowserAccessibility::Create access to our constructor. 40 // Give BrowserAccessibility::Create access to our constructor.
972 friend class BrowserAccessibility; 41 friend class BrowserAccessibility;
973 friend class BrowserAccessibilityRelation;
974
975 DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityWin); 42 DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityWin);
976 }; 43 };
977 44
978 CONTENT_EXPORT BrowserAccessibilityWin* 45 CONTENT_EXPORT BrowserAccessibilityWin*
979 ToBrowserAccessibilityWin(BrowserAccessibility* obj); 46 ToBrowserAccessibilityWin(BrowserAccessibility* obj);
980 47
981 CONTENT_EXPORT const BrowserAccessibilityWin* 48 CONTENT_EXPORT const BrowserAccessibilityWin*
982 ToBrowserAccessibilityWin(const BrowserAccessibility* obj); 49 ToBrowserAccessibilityWin(const BrowserAccessibility* obj);
983 50
984 } // namespace content 51 } // namespace content
985 52
986 #endif // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_ 53 #endif // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
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