Use unique IDs for accessibility nodes on Android

content/browser/accessibility/browser_accessibility.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 57 matching lines @@
 //
 ////////////////////////////////////////////////////////////////////////////////
 class CONTENT_EXPORT BrowserAccessibility {
  public:
   // Creates a platform specific BrowserAccessibility. Ownership passes to the
   // caller.
   static BrowserAccessibility* Create();
 
   virtual ~BrowserAccessibility();
 
+  static BrowserAccessibility* GetFromUniqueID(int32_t unique_id);
+
   // Called only once, immediately after construction. The constructor doesn't
   // take any arguments because in the Windows subclass we use a special
   // function to construct a COM object.
   virtual void Init(BrowserAccessibilityManager* manager, ui::AXNode* node);
 
   // Called after the object is first initialized and again every time
   // its data changes.
   virtual void OnDataChanged() {}
 
   virtual void OnSubtreeWillBeDeleted() {}
@@ skipping 99 matching lines @@
   // Subclasses should override this to support platform reference counting.
   virtual void NativeReleaseReference();
 
   //
   // Accessors
   //
 
   BrowserAccessibilityManager* manager() const { return manager_; }
   bool instance_active() const { return node_ != NULL; }
   ui::AXNode* node() const { return node_; }
+  int32_t unique_id() const { return unique_id_; }
 
   // These access the internal accessibility tree, which doesn't necessarily
   // reflect the accessibility tree that should be exposed on each platform.
   // Use PlatformChildCount and PlatformGetChild to implement platform
   // accessibility APIs.
   uint32_t InternalChildCount() const;
   BrowserAccessibility* InternalGetChild(uint32_t child_index) const;
   BrowserAccessibility* InternalGetParent() const;
 
   BrowserAccessibility* GetParent() const;
   int32_t GetIndexInParent() const;
 
   int32_t GetId() const;
   const ui::AXNodeData& GetData() const;
   gfx::Rect GetLocation() const;
   int32_t GetRole() const;
   int32_t GetState() const;
 
   typedef base::StringPairs HtmlAttributes;
   const HtmlAttributes& GetHtmlAttributes() const;
 
   // Returns true if this is a native platform-specific object, vs a
   // cross-platform generic object. Don't call ToBrowserAccessibilityXXX if
   // IsNative returns false.
   virtual bool IsNative() const;
 
-#if defined(OS_MACOSX) && __OBJC__
-  const BrowserAccessibilityCocoa* ToBrowserAccessibilityCocoa() const;
-  BrowserAccessibilityCocoa* ToBrowserAccessibilityCocoa();
-#elif defined(OS_WIN)
-  const BrowserAccessibilityWin* ToBrowserAccessibilityWin() const;
-  BrowserAccessibilityWin* ToBrowserAccessibilityWin();
-#elif defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_X11)
-  const BrowserAccessibilityAuraLinux* ToBrowserAccessibilityAuraLinux() const;
-  BrowserAccessibilityAuraLinux* ToBrowserAccessibilityAuraLinux();
-#endif
-
   // Accessing accessibility attributes:
   //
   // There are dozens of possible attributes for an accessibility node,
   // but only a few tend to apply to any one object, so we store them
   // in sparse arrays of <attribute id, attribute value> pairs, organized
   // by type (bool, int, float, string, int list).
   //
   // There are three accessors for each type of attribute: one that returns
   // true if the attribute is present and false if not, one that takes a
   // pointer argument and returns true if the attribute is present (if you
@@ skipping 77 matching lines @@
 
  protected:
   BrowserAccessibility();
 
   // The manager of this tree of accessibility objects.
   BrowserAccessibilityManager* manager_;
 
   // The underlying node.
   ui::AXNode* node_;
 
+  // A unique ID, since node IDs are frame-local.
+  int32_t unique_id_;
+
  private:
   // |GetInnerText| recursively includes all the text from descendants such as
   // text found in any embedded object. In contrast, |GetText| might include a
   // special character in the place of every embedded object instead of its
   // text, depending on the platform.
   base::string16 GetInnerText() const;
 
   // If a bounding rectangle is empty, compute it based on the union of its
   // children, since most accessibility APIs don't like elements with no
   // bounds, but "virtual" elements in the accessibility tree that don't
   // correspond to a layed-out element sometimes don't have bounds.
   void FixEmptyBounds(gfx::Rect* bounds) const;
 
   // Convert the bounding rectangle of an element (which is relative to
   // its nearest scrollable ancestor) to local bounds (which are relative
   // to the top of the web accessibility tree).
   gfx::Rect ElementBoundsToLocalBounds(gfx::Rect bounds) const;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_