Implement additional IAccessibleText methods to return the nearest...

chrome/browser/accessibility/browser_accessibility_win.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
 #define CHROME_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlcom.h>
@@ skipping 212 matching lines @@
                                  LONG* x, LONG* y);
 
   STDMETHODIMP get_imageSize(LONG* height, LONG* width);
 
   //
   // IAccessibleText methods.
   //
 
   STDMETHODIMP get_nCharacters(LONG* n_characters);
 
-  STDMETHODIMP get_text(LONG start_offset, LONG end_offset, BSTR* text);
-
   STDMETHODIMP get_caretOffset(LONG* offset);
 
   STDMETHODIMP get_nSelections(LONG* n_selections);
 
   STDMETHODIMP get_selection(LONG selection_index,
                              LONG* start_offset,
                              LONG* end_offset);
 
+  STDMETHODIMP get_text(LONG start_offset, LONG end_offset, BSTR* text);
+
+  STDMETHODIMP get_textAtOffset(LONG offset,
+                                enum IA2TextBoundaryType boundary_type,
+                                LONG* start_offset, LONG* end_offset,
+                                BSTR* text);
+
+  STDMETHODIMP get_textBeforeOffset(LONG offset,
+                                    enum IA2TextBoundaryType boundary_type,
+                                    LONG* start_offset, LONG* end_offset,
+                                    BSTR* text);
+
+  STDMETHODIMP get_textAfterOffset(LONG offset,
+                                   enum IA2TextBoundaryType boundary_type,
+                                   LONG* start_offset, LONG* end_offset,
+                                   BSTR* text);
 
   // IAccessibleText methods not implemented.
   STDMETHODIMP addSelection(LONG start_offset, LONG end_offset) {
     return E_NOTIMPL;
   }
   STDMETHODIMP get_attributes(LONG offset, LONG* start_offset, LONG* end_offset,
                               BSTR* text_attributes) {
     return E_NOTIMPL;
   }
   STDMETHODIMP get_characterExtents(LONG offset,
                                     enum IA2CoordinateType coord_type,
                                     LONG* x, LONG* y,
                                     LONG* width, LONG* height) {
     return E_NOTIMPL;
   }
   STDMETHODIMP get_offsetAtPoint(LONG x, LONG y,
-                             enum IA2CoordinateType coord_type,
-                             LONG* offset) {
-    return E_NOTIMPL;
-  }
-  STDMETHODIMP get_textBeforeOffset(LONG offset,
-                                enum IA2TextBoundaryType boundary_type,
-                                LONG* start_offset, LONG* end_offset,
-                                BSTR* text) {
-    return E_NOTIMPL;
-  }
-  STDMETHODIMP get_textAfterOffset(LONG offset,
-                               enum IA2TextBoundaryType boundary_type,
-                               LONG* start_offset, LONG* end_offset,
-                               BSTR* text) {
-    return E_NOTIMPL;
-  }
-  STDMETHODIMP get_textAtOffset(LONG offset,
-                            enum IA2TextBoundaryType boundary_type,
-                            LONG* start_offset, LONG* end_offset,
-                            BSTR* text) {
+                                 enum IA2CoordinateType coord_type,
+                                 LONG* offset) {
     return E_NOTIMPL;
   }
   STDMETHODIMP removeSelection(LONG selection_index) {
     return E_NOTIMPL;
   }
   STDMETHODIMP setCaretOffset(LONG offset) {
     return E_NOTIMPL;
   }
   STDMETHODIMP setSelection(LONG selection_index,
                             LONG start_offset,
@@ skipping 188 matching lines @@
   // Retrieve the value of an attribute from the attribute map and
   // if found and nonempty, try to convert it to an integer.
   // Returns true only if both the attribute was found and it was successfully
   // converted to an integer.
   bool GetAttributeAsInt(
       WebAccessibility::Attribute attribute, int* value_int);
 
   // Escape a string like it would be escaped for a URL or HTML form.
   string16 Escape(string16 str);
 
+  // Get the text of this node for the purposes of IAccessibleText - it may
+  // be the name, it may be the value, etc. depending on the role.
+  const string16& TextForIAccessibleText();
+
+  // Search forwards (direction == 1) or backwards (direction == -1) from
+  // the given offset until the given IAccessible2 boundary (like word,
+  // sentence) is found, and return its offset.
+  LONG FindBoundary(const string16& text,
+                    IA2TextBoundaryType boundary,
+                    LONG start_offset,
+                    LONG direction);
+
   // COM objects are reference-counted. When we're done with this object
   // and it's removed from our accessibility tree, a client may still be
   // holding onto a pointer to this object, so we mark it as inactive
   // so that calls to any of this object's methods immediately return
   // failure.
   bool instance_active_;
 
   // IAccessible role and state.
   int32 ia_state_;
   int32 ia_role_;
 
   // IAccessible2 role and state.
   int32 ia2_role_;
   int32 ia2_state_;
 
   // Give BrowserAccessibility::Create access to our constructor.
   friend class BrowserAccessibility;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityWin);
 };
 
 #endif  // CHROME_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_