Adds MSAA/IAccessible exposure of web content.

Review URL: http://codereview.chromium.org/4057

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@2738 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 43 insertions, 4 deletions

diff --git a/chrome/renderer/render_view.cc b/chrome/renderer/render_view.cc
index 636fc54..af907c1 100644
--- a/chrome/renderer/render_view.cc
+++ b/chrome/renderer/render_view.cc
@@ -310,7 +310,8 @@ void RenderView::OnMessageReceived(const IPC::Message& message) {
                         OnAllowDomAutomationBindings)
     IPC_MESSAGE_HANDLER(ViewMsg_AllowBindings, OnAllowBindings)
     IPC_MESSAGE_HANDLER(ViewMsg_SetDOMUIProperty, OnSetDOMUIProperty)
-    IPC_MESSAGE_HANDLER(ViewMsg_DragSourceEndedOrMoved, OnDragSourceEndedOrMoved)
+    IPC_MESSAGE_HANDLER(ViewMsg_DragSourceEndedOrMoved,
+                        OnDragSourceEndedOrMoved)
     IPC_MESSAGE_HANDLER(ViewMsg_DragSourceSystemDragEnded,
                         OnDragSourceSystemDragEnded)
     IPC_MESSAGE_HANDLER(ViewMsg_SetInitialFocus, OnSetInitialFocus)
@@ -328,6 +329,9 @@ void RenderView::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(ViewMsg_GetSerializedHtmlDataForCurrentPageWithLocalLinks,
                         OnGetSerializedHtmlDataForCurrentPageWithLocalLinks)
     IPC_MESSAGE_HANDLER(ViewMsg_GetApplicationInfo, OnGetApplicationInfo)
+    IPC_MESSAGE_HANDLER(ViewMsg_GetAccessibilityInfo, OnGetAccessibilityInfo)
+    IPC_MESSAGE_HANDLER(ViewMsg_ClearAccessibilityInfo,
+                        OnClearAccessibilityInfo)
     IPC_MESSAGE_HANDLER(ViewMsg_ShouldClose, OnMsgShouldClose)
     IPC_MESSAGE_HANDLER(ViewMsg_ClosePage, OnClosePage)
     IPC_MESSAGE_HANDLER(ViewMsg_ThemeChanged, OnThemeChanged)
@@ -1051,6 +1055,11 @@ void RenderView::UpdateURL(WebFrame* frame) {
   // we don't want the transition type to persist.
   if (extra_data)
     extra_data->transition_type = PageTransition::LINK;  // Just clear it.
+
+  if (glue_accessibility_.get()) {
+    // Clear accessibility info cache. 
+    glue_accessibility_->ClearIAccessibleMap(-1, true);
+  }
 }
 
 // Tell the embedding application that the title of the active page has changed
@@ -1146,7 +1155,7 @@ void RenderView::DidStartProvisionalLoadForFrame(
     NavigationGesture gesture) {
   if (webview->GetMainFrame() == frame) {
     navigation_gesture_ = gesture;
-    
+
     // Make sure redirect tracking state is clear for the new load.
     completed_client_redirect_src_ = GURL();
   }
@@ -2260,8 +2269,7 @@ void RenderView::OnAllowDomAutomationBindings(bool allow_bindings) {
 }
 
 void RenderView::OnAllowBindings(bool enable_dom_ui_bindings,
-                                 bool enable_external_host_bindings)
-{
+                                 bool enable_external_host_bindings) {
   enable_dom_ui_bindings_ = enable_dom_ui_bindings;
   enable_external_host_bindings_ = enable_external_host_bindings;
 }
@@ -2406,6 +2414,29 @@ void RenderView::OnUpdateBackForwardListCount(int back_list_count,
   history_forward_list_count_ = forward_list_count;
 }
 
+void RenderView::OnGetAccessibilityInfo(
+    const ViewMsg_Accessibility_In_Params& in_params,
+    ViewHostMsg_Accessibility_Out_Params* out_params) {
+
+  if (!glue_accessibility_.get())
+    glue_accessibility_.reset(new GlueAccessibility());
+
+  if (!glue_accessibility_->
+       GetAccessibilityInfo(webview(), in_params, out_params)) {
+    return;
+  }
+}
+
+void RenderView::OnClearAccessibilityInfo(int iaccessible_id, bool clear_all) {
+  if (!glue_accessibility_.get()) {
+    // If accessibility is not activated, ignore clearing message.
+    return;
+  }
+
+  if (!glue_accessibility_->ClearIAccessibleMap(iaccessible_id, clear_all))
+    return;
+}
+
 void RenderView::OnGetAllSavableResourceLinksForCurrentPage(
     const GURL& page_url) {
   // Prepare list to storage all savable resource links.
diff --git a/chrome/renderer/render_view.h b/chrome/renderer/render_view.h
index 6f6b9c3..71faf63 100644
--- a/chrome/renderer/render_view.h
+++ b/chrome/renderer/render_view.h
@@ -26,6 +26,7 @@
 #include "chrome/renderer/render_widget.h"
 #include "webkit/glue/console_message_level.h"
 #include "webkit/glue/dom_serializer_delegate.h"
+#include "webkit/glue/glue_accessibility.h"
 #include "webkit/glue/webview_delegate.h"
 #include "webkit/glue/webview.h"
 
@@ -418,6 +419,9 @@ class RenderView : public RenderWidget, public WebViewDelegate,
   void OnEnableViewSourceMode();
   void OnUpdateBackForwardListCount(int back_list_count,
                                     int forward_list_count);
+  void OnGetAccessibilityInfo(const ViewMsg_Accessibility_In_Params& in_params,
+                              ViewHostMsg_Accessibility_Out_Params* out_params);
+  void OnClearAccessibilityInfo(int iaccessible_id, bool clear_all);
 
   // Checks if the RenderView should close, runs the beforeunload handler and
   // sends ViewMsg_ShouldClose to the browser.
@@ -612,6 +616,10 @@ class RenderView : public RenderWidget, public WebViewDelegate,
   // True if the page has any frame-level unload or beforeunload listeners.
   bool has_unload_listener_;
 
+  // Handles accessibility requests into the renderer side, as well as
+  // maintains the cache and other features of the accessibility tree.
+  scoped_ptr<GlueAccessibility> glue_accessibility_;
+
   DISALLOW_EVIL_CONSTRUCTORS(RenderView);
 };