Update browser cache of accessibility tree on renderer sub-tree changes....

chrome/renderer/render_view.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/renderer/render_view.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 776 matching lines @@
     IPC_MESSAGE_HANDLER(ViewMsg_ExecuteCode,
                         OnExecuteCode)
     IPC_MESSAGE_HANDLER(ViewMsg_CustomContextMenuAction,
                         OnCustomContextMenuAction)
     IPC_MESSAGE_HANDLER(ViewMsg_TranslatePage, OnTranslatePage)
     IPC_MESSAGE_HANDLER(ViewMsg_RevertTranslation, OnRevertTranslation)
     IPC_MESSAGE_HANDLER(ViewMsg_GetAccessibilityTree, OnGetAccessibilityTree)
     IPC_MESSAGE_HANDLER(ViewMsg_SetAccessibilityFocus, OnSetAccessibilityFocus)
     IPC_MESSAGE_HANDLER(ViewMsg_AccessibilityDoDefaultAction,
                         OnAccessibilityDoDefaultAction)
+    IPC_MESSAGE_HANDLER(ViewMsg_AccessibilityObjectChildrenChange_ACK,
+                        OnAccessibilityObjectChildrenChangeAck)
     IPC_MESSAGE_HANDLER(ViewMsg_OpenFileSystemRequest_Complete,
                         OnOpenFileSystemRequestComplete)
 
     // Have the super handle all other messages.
     IPC_MESSAGE_UNHANDLED(RenderWidget::OnMessageReceived(message))
   IPC_END_MESSAGE_MAP()
 }
 
 void RenderView::OnCaptureThumbnail() {
   WebFrame* main_frame = webview()->mainFrame();
@@ skipping 638 matching lines @@
       std::max(last_page_id_sent_to_browser_, page_id_);
 
   // If we end up reusing this WebRequest (for example, due to a #ref click),
   // we don't want the transition type to persist.  Just clear it.
   navigation_state->set_transition_type(PageTransition::LINK);
 
   if (accessibility_.get()) {
     accessibility_->clear();
     accessibility_.reset();
   }
+  accessibility_changes_.clear();
 }
 
 // Tell the embedding application that the title of the active page has changed
 void RenderView::UpdateTitle(WebFrame* frame, const string16& title) {
   // Ignore all but top level navigations...
   if (!frame->parent()) {
     Send(new ViewHostMsg_UpdateTitle(
         routing_id_,
         page_id_,
         UTF16ToWideHack(title.length() > chrome::kMaxTitleChars ?
@@ skipping 2794 matching lines @@
 
 void RenderView::OnUpdateBrowserWindowId(int window_id) {
   browser_window_id_ = window_id;
 }
 
 void RenderView::OnGetAccessibilityTree() {
   if (accessibility_.get())
     accessibility_->clear();
     accessibility_.reset(WebAccessibilityCache::create());
     accessibility_->initialize(webview());
+  accessibility_changes_.clear();
 
   WebAccessibilityObject src_tree = webview()->accessibilityObject();
   webkit_glue::WebAccessibility dst_tree(src_tree, accessibility_.get());
   Send(new ViewHostMsg_AccessibilityTree(routing_id_, dst_tree));
 }
 
 void RenderView::OnSetAccessibilityFocus(int acc_obj_id) {
   if (!accessibility_.get())
     return;
   if (accessibility_->isValidId(acc_obj_id)) {
     // TODO(dmazzoni) fix the cache so that id=1000 is not a magic number.
     // By convention, calling SetFocus on the root of the tree (id = 1000)
     // should clear the current focus. Otherwise set the focus to the new
     // node.
     if (acc_obj_id == 1000)
       webview()->clearFocusedNode();
     else
       accessibility_->getObjectById(acc_obj_id).setFocused(true);
   }
 }
 
 void RenderView::OnAccessibilityDoDefaultAction(int acc_obj_id) {
   if (!accessibility_.get())
     return;
   if (accessibility_->isValidId(acc_obj_id)) {
     accessibility_->getObjectById(acc_obj_id).performDefaultAction();
   }
 }
 
+void RenderView::OnAccessibilityObjectChildrenChangeAck() {
+  if (!accessibility_.get())
+    return;
+
+  if (!accessibility_changes_.empty()) {
+    Send(new ViewHostMsg_AccessibilityObjectChildrenChange(
+        routing_id_,
+        accessibility_changes_));
+  }
+
+  accessibility_changes_.clear();
+}
+
 void RenderView::OnGetAllSavableResourceLinksForCurrentPage(
     const GURL& page_url) {
   // Prepare list to storage all savable resource links.
   std::vector<GURL> resources_list;
   std::vector<GURL> referrers_list;
   std::vector<GURL> frames_list;
   webkit_glue::SavableResourcesResult result(&resources_list,
                                              &referrers_list,
                                              &frames_list);
 
@@ skipping 938 matching lines @@
   if (acc_obj_id >= 0)
     Send(new ViewHostMsg_AccessibilityObjectStateChange(routing_id_,
                                                         acc_obj_id));
 
 #else  // defined(OS_WIN)
   // TODO(port): accessibility not yet implemented
   NOTIMPLEMENTED();
 #endif
 }
 
+void RenderView::didChangeAccessibilityObjectChildren(
+    const WebKit::WebAccessibilityObject& acc_obj) {
+  if (!accessibility_.get())
+    return;
+
+  if (accessibility_changes_.empty()) {
+    Send(new ViewHostMsg_AccessibilityObjectChildrenChange(
+        routing_id_,
+        std::vector<webkit_glue::WebAccessibility>()));
+  }
+
+  accessibility_changes_.push_back(
+      webkit_glue::WebAccessibility(acc_obj, accessibility_.get()));
+}
+
 void RenderView::Print(WebFrame* frame, bool script_initiated) {
   DCHECK(frame);
   if (print_helper_.get() == NULL) {
     print_helper_.reset(new PrintWebViewHelper(this));
   }
   print_helper_->Print(frame, script_initiated);
 }
 
 void RenderView::OnSetEditCommandsForNextKeyEvent(
     const EditCommands& edit_commands) {
@@ skipping 273 matching lines @@
   PendingOpenFileSystem* request = pending_file_system_requests_.Lookup(
       request_id);
   DCHECK(request);
   if (accepted)
     request->callbacks->didOpenFileSystem(name, root_path);
   else
     request->callbacks->didFail(WebKit::WebFileErrorSecurity);
   request->callbacks = NULL;
   pending_file_system_requests_.Remove(request_id);
 }