Add an accessibility mode for editable text fields only.

content/renderer/renderer_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_RENDERER_RENDERER_ACCESSIBILITY_H_
 #define CONTENT_RENDERER_RENDERER_ACCESSIBILITY_H_
 #pragma once
 
 #include <vector>
 
 #include "base/hash_tables.h"
 #include "base/memory/weak_ptr.h"
+#include "content/common/accessibility_messages.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAccessibilityNotification.h"
 
 class RenderViewImpl;
 
 namespace WebKit {
 class WebAccessibilityObject;
 class WebDocument;
 class WebNode;
 };
 
 namespace webkit_glue {
 struct WebAccessibility;
 };
 
 // RendererAccessibility belongs to the RenderView. It's responsible for
 // sending a serialized representation of WebKit's accessibility tree from
 // the renderer to the browser and sending updates whenever it changes, and
 // handling requests from the browser to perform accessibility actions on
 // nodes in the tree (e.g., change focus, or click on a button).
 class RendererAccessibility : public content::RenderViewObserver {
  public:
-  RendererAccessibility(RenderViewImpl* render_view);
+  RendererAccessibility(RenderViewImpl* render_view,
+                        AccessibilityMode accessibility_mode);
   virtual ~RendererAccessibility();
 
   // RenderView::Observer implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void FocusedNodeChanged(const WebKit::WebNode& node) OVERRIDE;
   virtual void DidFinishLoad(WebKit::WebFrame* frame) OVERRIDE;
 
   // Called when an accessibility notification occurs in WebKit.
   virtual void PostAccessibilityNotification(
       const WebKit::WebAccessibilityObject& obj,
@@ skipping 32 matching lines @@
   // Clear the given node and recursively delete all of its descendants
   // from the browser tree. (Does not delete |browser_node|).
   void ClearBrowserTreeNode(BrowserTreeNode* browser_node);
 
   // Handlers for messages from the browser to the renderer.
   void OnDoDefaultAction(int acc_obj_id);
   void OnNotificationsAck();
   void OnChangeScrollPosition(int acc_obj_id, int scroll_x, int scroll_y);
   void OnScrollToMakeVisible(int acc_obj_id, gfx::Rect subfocus);
   void OnScrollToPoint(int acc_obj_id, gfx::Point point);
-  void OnEnable();
+  void OnSetMode(AccessibilityMode mode);
   void OnSetFocus(int acc_obj_id);
 
   void OnSetTextSelection(int acc_obj_id, int start_offset, int end_offset);
 
   // Whether or not this notification typically needs to send
   // updates to its children, too.
   bool ShouldIncludeChildren(const Notification& notification);
 
   // Returns the main top-level document for this page, or NULL if there's
   // no view or frame.
   WebKit::WebDocument GetMainDocument();
 
+  // Checks if a WebKit accessibility object is an editable text node.
+  bool IsEditableText(const WebKit::WebAccessibilityObject& node);
+
+  // Recursively explore the tree of WebKit accessibility objects rooted
+  // at |src|, and for each editable text node encountered, add a
+  // corresponding WebAccessibility node as a child of |dst|.
+  void RecursiveAddEditableTextNodesToTree(
+      const WebKit::WebAccessibilityObject& src,
+      webkit_glue::WebAccessibility* dst);
+
+  // Build a tree of serializable WebAccessibility nodes to send to the
+  // browser process, given a WebAccessibilityObject node from WebKit.
+  // Modifies |dst| in-place, it's assumed to be empty.
+  void BuildAccessibilityTree(const WebKit::WebAccessibilityObject& src,
+                              bool include_children,
+                              webkit_glue::WebAccessibility* dst);
+
   // So we can queue up tasks to be executed later.
   base::WeakPtrFactory<RendererAccessibility> weak_factory_;
 
   // Notifications from WebKit are collected until they are ready to be
   // sent to the browser.
   std::vector<Notification> pending_notifications_;
 
   // Our representation of the browser tree.
   BrowserTreeNode* browser_root_;
 
   // A map from IDs to nodes in the browser tree.
   base::hash_map<int32, BrowserTreeNode*> browser_id_map_;
 
   // The most recently observed scroll offset of the root document element.
   // TODO(dmazzoni): remove once https://bugs.webkit.org/show_bug.cgi?id=73460
   // is fixed.
   gfx::Size last_scroll_offset_;
 
+  // The current accessibility mode.
+  AccessibilityMode mode_;
+
   // Set if we are waiting for an accessibility notification ack.
   bool ack_pending_;
 
   // True if verbose logging of accessibility events is on.
   bool logging_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererAccessibility);
 };
 
 #endif  // CONTENT_RENDERER_RENDERER_ACCESSIBILITY_H_