ui/views/accessibility/native_view_accessibility.h

   1 // Copyright (c) 2013 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 UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_
   6 #define UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_
   7
   8 #include "ui/accessibility/ax_node_data.h"
   9 #include "ui/accessibility/platform/ax_platform_node.h"
  10 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
  11 #include "ui/gfx/native_widget_types.h"
  12 #include "ui/views/views_export.h"
  13 #include "ui/views/widget/widget_observer.h"
  14
  15 namespace views {
  16
  17 class View;
  18 class Widget;
  19
  20 class VIEWS_EXPORT NativeViewAccessibility
  21     : public ui::AXPlatformNodeDelegate,
  22       public WidgetObserver {
  23  public:
  24   static NativeViewAccessibility* Create(View* view);
  25
  26   gfx::NativeViewAccessible GetNativeObject();
  27
  28   // Call Destroy rather than deleting this, because the subclass may
  29   // use reference counting.
  30   virtual void Destroy();
  31
  32   void NotifyAccessibilityEvent(ui::AXEvent event_type);
  33
  34   // ui::AXPlatformNodeDelegate
  35   const ui::AXNodeData& GetData() override;
  36   int GetChildCount() override;
  37   gfx::NativeViewAccessible ChildAtIndex(int index) override;
  38   gfx::NativeViewAccessible GetParent() override;
  39   gfx::Vector2d GetGlobalCoordinateOffset() override;
  40   gfx::NativeViewAccessible HitTestSync(int x, int y) override;
  41   gfx::NativeViewAccessible GetFocus() override;
  42   gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() override;
  43   void DoDefaultAction() override;
  44   bool SetStringValue(const base::string16& new_value) override;
  45
  46   // WidgetObserver
  47   void OnWidgetDestroying(Widget* widget) override;
  48
  49   Widget* parent_widget() const { return parent_widget_; }
  50   void SetParentWidget(Widget* parent_widget);
  51
  52  protected:
  53   NativeViewAccessibility(View* view);
  54   ~NativeViewAccessibility() override;
  55
  56   // Weak. Owns this.
  57   View* view_;
  58
  59   // Weak. Uses WidgetObserver to clear. This is set on the root view for
  60   // a widget that's owned by another widget, so we can walk back up the
  61   // tree.
  62   Widget* parent_widget_;
  63
  64  private:
  65   void PopulateChildWidgetVector(std::vector<Widget*>* result_child_widgets);
  66
  67   // We own this, but it is reference-counted on some platforms so we can't use
  68   // a scoped_ptr. It is dereferenced in the destructor.
  69   ui::AXPlatformNode* ax_node_;
  70
  71   ui::AXNodeData data_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(NativeViewAccessibility);
  74 };
  75
  76 }  // namespace views
  77
  78 #endif  // UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_