content/browser/accessibility/browser_accessibility_manager_win.h

   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
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
   6 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
   7
   8 #include <oleacc.h>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/win/scoped_comptr.h"
  12 #include "content/browser/accessibility/browser_accessibility_manager.h"
  13
  14 namespace content {
  15 class BrowserAccessibilityWin;
  16
  17 class LegacyRenderWidgetHostHWND;
  18
  19 // Manages a tree of BrowserAccessibilityWin objects.
  20 class CONTENT_EXPORT BrowserAccessibilityManagerWin
  21     : public BrowserAccessibilityManager {
  22  public:
  23   BrowserAccessibilityManagerWin(
  24       content::LegacyRenderWidgetHostHWND* accessible_hwnd,
  25       IAccessible* parent_iaccessible,
  26       const ui::AXNodeData& src,
  27       BrowserAccessibilityDelegate* delegate,
  28       BrowserAccessibilityFactory* factory = new BrowserAccessibilityFactory());
  29
  30   virtual ~BrowserAccessibilityManagerWin();
  31
  32   static ui::AXNodeData GetEmptyDocument();
  33
  34   // Get the closest containing HWND.
  35   HWND parent_hwnd() { return parent_hwnd_; }
  36
  37   // The IAccessible for the parent window.
  38   IAccessible* parent_iaccessible() { return parent_iaccessible_; }
  39   void set_parent_iaccessible(IAccessible* parent_iaccessible) {
  40     parent_iaccessible_ = parent_iaccessible;
  41   }
  42
  43   // Calls NotifyWinEvent if the parent window's IAccessible pointer is known.
  44   void MaybeCallNotifyWinEvent(DWORD event, LONG child_id);
  45
  46   // BrowserAccessibilityManager methods
  47   virtual void AddNodeToMap(BrowserAccessibility* node);
  48   virtual void RemoveNode(BrowserAccessibility* node) OVERRIDE;
  49   virtual void NotifyAccessibilityEvent(
  50       ui::AXEvent event_type, BrowserAccessibility* node) OVERRIDE;
  51
  52   // Track this object and post a VISIBLE_DATA_CHANGED notification when
  53   // its container scrolls.
  54   // TODO(dmazzoni): remove once http://crbug.com/113483 is fixed.
  55   void TrackScrollingObject(BrowserAccessibilityWin* node);
  56
  57   // Return a pointer to the object corresponding to the given windows-specific
  58   // unique id, does not make a new reference.
  59   BrowserAccessibilityWin* GetFromUniqueIdWin(LONG unique_id_win);
  60
  61   // Called when |accessible_hwnd_| is deleted by its parent.
  62   void OnAccessibleHwndDeleted();
  63
  64  private:
  65   // The closest ancestor HWND.
  66   HWND parent_hwnd_;
  67
  68   // The accessibility instance for the parent window.
  69   IAccessible* parent_iaccessible_;
  70
  71   // Give BrowserAccessibilityManager::Create access to our constructor.
  72   friend class BrowserAccessibilityManager;
  73
  74   // Track the most recent object that has been asked to scroll and
  75   // post a notification directly on it when it reaches its destination.
  76   // TODO(dmazzoni): remove once http://crbug.com/113483 is fixed.
  77   BrowserAccessibilityWin* tracked_scroll_object_;
  78
  79   // A mapping from the Windows-specific unique IDs (unique within the
  80   // browser process) to renderer ids within this page.
  81   base::hash_map<long, int32> unique_id_to_renderer_id_map_;
  82
  83   // Owned by its parent; OnAccessibleHwndDeleted gets called upon deletion.
  84   LegacyRenderWidgetHostHWND* accessible_hwnd_;
  85
  86   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerWin);
  87 };
  88
  89 }  // namespace content
  90
  91 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_