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 // Manages a tree of BrowserAccessibilityWin objects.
  18 class CONTENT_EXPORT BrowserAccessibilityManagerWin
  19     : public BrowserAccessibilityManager {
  20  public:
  21   BrowserAccessibilityManagerWin(
  22       const ui::AXTreeUpdate& initial_tree,
  23       BrowserAccessibilityDelegate* delegate,
  24       BrowserAccessibilityFactory* factory = new BrowserAccessibilityFactory());
  25
  26   virtual ~BrowserAccessibilityManagerWin();
  27
  28   static ui::AXTreeUpdate GetEmptyDocument();
  29
  30   // Get the closest containing HWND.
  31   HWND GetParentHWND();
  32
  33   // The IAccessible for the parent window.
  34   IAccessible* GetParentIAccessible();
  35
  36   // Calls NotifyWinEvent if the parent window's IAccessible pointer is known.
  37   void MaybeCallNotifyWinEvent(DWORD event, BrowserAccessibility* node);
  38
  39   // AXTree methods
  40   virtual void OnNodeWillBeDeleted(ui::AXNode* node) override;
  41   virtual void OnNodeCreated(ui::AXNode* node) override;
  42
  43   // BrowserAccessibilityManager methods
  44   void OnWindowFocused() override;
  45   void UserIsReloading() override;
  46   void NotifyAccessibilityEvent(
  47       ui::AXEvent event_type, BrowserAccessibility* node) override;
  48
  49   // Track this object and post a VISIBLE_DATA_CHANGED notification when
  50   // its container scrolls.
  51   // TODO(dmazzoni): remove once http://crbug.com/113483 is fixed.
  52   void TrackScrollingObject(BrowserAccessibilityWin* node);
  53
  54   // Return a pointer to the object corresponding to the given windows-specific
  55   // unique id, does not make a new reference.
  56   BrowserAccessibilityWin* GetFromUniqueIdWin(LONG unique_id_win);
  57
  58   // Called when |accessible_hwnd_| is deleted by its parent.
  59   void OnAccessibleHwndDeleted();
  60
  61  protected:
  62   // BrowserAccessibilityManager methods
  63   void OnAtomicUpdateFinished(
  64       bool root_changed,
  65       const std::vector<ui::AXTreeDelegate::Change>& changes) override;
  66
  67  private:
  68   // Give BrowserAccessibilityManager::Create access to our constructor.
  69   friend class BrowserAccessibilityManager;
  70
  71   // Track the most recent object that has been asked to scroll and
  72   // post a notification directly on it when it reaches its destination.
  73   // TODO(dmazzoni): remove once http://crbug.com/113483 is fixed.
  74   BrowserAccessibilityWin* tracked_scroll_object_;
  75
  76   // A mapping from the Windows-specific unique IDs (unique within the
  77   // browser process) to accessibility ids within this page.
  78   base::hash_map<long, int32> unique_id_to_ax_id_map_;
  79
  80   // Set to true if we need to fire a focus event on the root as soon as
  81   // possible.
  82   bool focus_event_on_root_needed_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerWin);
  85 };
  86
  87 }  // namespace content
  88
  89 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_