Add initial GTK web accessibility framework (third attempt).

content/browser/renderer_host/render_widget_host_view_gtk.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_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 #pragma once
 
 #include <gdk/gdk.h>
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
+#include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/content_export.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/slide_animation.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/gtk/gtk_signal_registrar.h"
 #include "ui/base/gtk/owned_widget_gtk.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 #include "webkit/glue/webcursor.h"
 #include "webkit/plugins/npapi/gtk_plugin_container_manager.h"
 
 class GtkIMContextWrapper;
 struct NativeWebKeyboardEvent;
 
 namespace content {
 class RenderWidgetHost;
 class RenderWidgetHostImpl;
 }
 
 class GtkKeyBindingsHandler;
 
 typedef struct _GtkClipboard GtkClipboard;
 typedef struct _GtkSelectionData GtkSelectionData;
 
 // -----------------------------------------------------------------------------
 // See comments in render_widget_host_view.h about this class and its members.
 // -----------------------------------------------------------------------------
-class RenderWidgetHostViewGtk : public content::RenderWidgetHostViewBase {
+class CONTENT_EXPORT RenderWidgetHostViewGtk
+    : public content::RenderWidgetHostViewBase,
+      public BrowserAccessibilityDelegate {
  public:
   virtual ~RenderWidgetHostViewGtk();
 
   // RenderWidgetHostView implementation.
   virtual void InitAsChild(gfx::NativeView parent_view) OVERRIDE;
   virtual content::RenderWidgetHost* GetRenderWidgetHost() const OVERRIDE;
   virtual void SetSize(const gfx::Size& size) OVERRIDE;
   virtual void SetBounds(const gfx::Rect& rect) OVERRIDE;
   virtual gfx::NativeView GetNativeView() const OVERRIDE;
   virtual gfx::NativeViewId GetNativeViewId() const OVERRIDE;
@@ skipping 59 matching lines @@
                                bool processed) OVERRIDE;
   virtual void SetHasHorizontalScrollbar(
       bool has_horizontal_scrollbar) OVERRIDE;
   virtual void SetScrollOffsetPinning(
       bool is_pinned_to_left, bool is_pinned_to_right) OVERRIDE;
   virtual void GetScreenInfo(WebKit::WebScreenInfo* results) OVERRIDE;
   virtual gfx::Rect GetRootWindowBounds() OVERRIDE;
   virtual gfx::GLSurfaceHandle GetCompositingSurface() OVERRIDE;
   virtual bool LockMouse() OVERRIDE;
   virtual void UnlockMouse() OVERRIDE;
+  virtual void OnAccessibilityNotifications(
+      const std::vector<AccessibilityHostMsg_NotificationParams>& params)
+      OVERRIDE;
 
   // If the widget is aligned with an edge of the monitor its on and the user
   // attempts to drag past that edge we track the number of times it has
   // occurred, so that we can force the widget to scroll when it otherwise
   // would be unable to.
   void ModifyEventForEdgeDragging(GtkWidget* widget, GdkEventMotion* event);
 
   // Mouse events always provide a movementX/Y which needs to be computed.
   // Also, mouse lock requires knowledge of last unlocked cursor coordinates.
   // State is stored on the host view to do this, and the mouse event modified.
   void ModifyEventMovementAndCoords(WebKit::WebMouseEvent* event);
 
   void Paint(const gfx::Rect&);
 
   // Called by GtkIMContextWrapper to forward a keyboard event to renderer.
   // On Linux (not ChromeOS):
   // Before calling RenderWidgetHost::ForwardKeyboardEvent(), this method
   // calls GtkKeyBindingsHandler::Match() against the event and send matched
   // edit commands to renderer by calling
   // RenderWidgetHost::ForwardEditCommandsForNextKeyEvent().
   void ForwardKeyboardEvent(const NativeWebKeyboardEvent& event);
 
   bool RetrieveSurrounding(std::string* text, size_t* cursor_index);
 
+  // BrowserAccessibilityDelegate implementation.
+  virtual void SetAccessibilityFocus(int acc_obj_id) OVERRIDE;
+  virtual void AccessibilityDoDefaultAction(int acc_obj_id) OVERRIDE;
+  virtual void AccessibilityScrollToMakeVisible(
+      int acc_obj_id, gfx::Rect subfocus) OVERRIDE;
+  virtual void AccessibilityScrollToPoint(
+      int acc_obj_id, gfx::Point point) OVERRIDE;
+  virtual void AccessibilitySetTextSelection(
+      int acc_obj_id, int start_offset, int end_offset) OVERRIDE;
+
+  // Get the root of the AtkObject* tree for accessibility.
+  AtkObject* GetAccessible();
+
  protected:
   friend class content::RenderWidgetHostView;
 
   // Should construct only via RenderWidgetHostView::CreateViewForWidget.
   explicit RenderWidgetHostViewGtk(content::RenderWidgetHost* widget);
 
  private:
   friend class RenderWidgetHostViewGtkWidget;
 
   CHROMEGTK_CALLBACK_1(RenderWidgetHostViewGtk,
@@ skipping 121 matching lines @@
   // monitor (if the widget is aligned with that edge). Negative values
   // indicate the top edge, positive the bottom.
   int dragged_at_vertical_edge_;
 
   gfx::PluginWindowHandle compositing_surface_;
 
   // The event for the last mouse down we handled. We need this for context
   // menus and drags.
   GdkEventButton* last_mouse_down_;
 
+  // Instance of accessibility information for the root of the AtkObject
+  // tree representation of the WebKit render tree.
+  scoped_ptr<BrowserAccessibilityManager> browser_accessibility_manager_;
+
   ui::GtkSignalRegistrar signals_;
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_