Adds color, font size, text direction and text styles to the accessibility tree.

content/browser/accessibility/browser_accessibility_win.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/accessibility/browser_accessibility_win.h"
 
 #include <UIAutomationClient.h>
 #include <UIAutomationCoreApi.h>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 587 matching lines @@
       target->ia_role() == ROLE_SYSTEM_SCROLLBAR ||
       target->ia_role() == ROLE_SYSTEM_SLIDER) {
     base::string16 value_text = target->GetValueText();
     *value = SysAllocString(value_text.c_str());
     DCHECK(*value);
     return S_OK;
   }
 
   // Expose color well value.
   if (target->ia2_role() == IA2_ROLE_COLOR_CHOOSER) {
-    int r = target->GetIntAttribute(
-        ui::AX_ATTR_COLOR_VALUE_RED);
-    int g = target->GetIntAttribute(
-        ui::AX_ATTR_COLOR_VALUE_GREEN);
-    int b = target->GetIntAttribute(
-        ui::AX_ATTR_COLOR_VALUE_BLUE);
+    int color = target->GetIntAttribute(ui::AX_ATTR_COLOR_VALUE);
+    int red = (color >> 16) & 0xFF;
+    int green = (color >> 8) & 0xFF;
+    int blue = color & 0xFF;
     base::string16 value_text;
-    value_text = base::IntToString16((r * 100) / 255) + L"% red " +
-                 base::IntToString16((g * 100) / 255) + L"% green " +
-                 base::IntToString16((b * 100) / 255) + L"% blue";
+    value_text = base::IntToString16((red * 100) / 255) + L"% red " +
+                 base::IntToString16((green * 100) / 255) + L"% green " +
+                 base::IntToString16((blue * 100) / 255) + L"% blue";
     *value = SysAllocString(value_text.c_str());
     DCHECK(*value);
     return S_OK;
   }
 
   *value = SysAllocString(target->value().c_str());
   DCHECK(*value);
   return S_OK;
 }
 
@@ skipping 1747 matching lines @@
     return E_INVALIDARG;
 
   const base::string16& text_str = TextForIAccessibleText();
   HandleSpecialTextOffset(text_str, &start_offset);
   HandleSpecialTextOffset(text_str, &end_offset);
 
   manager()->SetTextSelection(*this, start_offset, end_offset);
   return S_OK;
 }
 
-//
-// IAccessibleText methods not implemented.
-//
-
 STDMETHODIMP BrowserAccessibilityWin::get_attributes(LONG offset,
                                                      LONG* start_offset,
                                                      LONG* end_offset,
                                                      BSTR* text_attributes) {
-  return E_NOTIMPL;
+  if (!instance_active())
+    return E_FAIL;
+
+  if (!start_offset || !end_offset || !text_attributes)
+    return E_INVALIDARG;
+
+  const base::string16& text_str = TextForIAccessibleText();
+  HandleSpecialTextOffset(text_str, &offset);
+  if (offset < 0)
+    return E_INVALIDARG;
+
+  LONG text_len = text_str.length();
+  if (offset > text_len)
+    return E_INVALIDARG;
+
+  base::string16 attributes_str = GetTextAttributes();
+  if (attributes_str.empty()) {
+    *start_offset = 0;
+    *end_offset = 0;
+    return S_FALSE;
+  }
+
+  *text_attributes = SysAllocString(attributes_str.c_str());
+  DCHECK(*text_attributes);
+  *start_offset = GetStyleChangeBoundary(offset, ui::BACKWARDS_DIRECTION);
+  *end_offset = GetStyleChangeBoundary(offset, ui::FORWARDS_DIRECTION);
+  return S_OK;
 }
 
 //
 // IAccessibleHypertext methods.
 //
 
 STDMETHODIMP BrowserAccessibilityWin::get_nHyperlinks(long* hyperlink_count) {
   if (!instance_active())
     return E_FAIL;
 
@@ skipping 1154 matching lines @@
 
 bool BrowserAccessibilityWin::IsNative() const {
   return true;
 }
 
 void BrowserAccessibilityWin::OnLocationChanged() {
   manager()->ToBrowserAccessibilityManagerWin()->MaybeCallNotifyWinEvent(
       EVENT_OBJECT_LOCATIONCHANGE, this);
 }
 
+//
+// Private methods.
+//
+
+base::string16 BrowserAccessibilityWin::GetTextAttributes() const {
+  base::string16 text_attributes;
+  int background_color = GetIntAttribute(ui::AX_ATTR_BACKGROUND_COLOR);
+  int color = GetIntAttribute(ui::AX_ATTR_COLOR);
+  float font_size = GetFloatAttribute(ui::AX_ATTR_FONT_SIZE);
+    int red = (color >> 16) & 0xFF;
+    int green = (color >> 8) & 0xFF;
+    int blue = color & 0xFF;
+    base::string16 value_text;
+    value_text = base::IntToString16((red * 100) / 255) + L"% red " +
+                 base::IntToString16((green * 100) / 255) + L"% green " +
+                 base::IntToString16((blue * 100) / 255) + L"% blue";
+    *value = SysAllocString(value_text.c_str());
+    DCHECK(*value);
+  return text_attributes;
+}
+
 BrowserAccessibilityWin* BrowserAccessibilityWin::NewReference() {
   AddRef();
   return this;
 }
 
 BrowserAccessibilityWin* BrowserAccessibilityWin::GetTargetFromChildID(
     const VARIANT& var_id) {
   if (var_id.vt != VT_I4)
     return NULL;
 
@@ skipping 772 matching lines @@
     ia2_role = ia_role;
 
   win_attributes_->ia_role = ia_role;
   win_attributes_->ia_state = ia_state;
   win_attributes_->role_name = role_name;
   win_attributes_->ia2_role = ia2_role;
   win_attributes_->ia2_state = ia2_state;
 }
 
 }  // namespace content