Implement Android accessible hit testing using an IPC to the renderer process.

content/renderer/accessibility/renderer_accessibility_complete.cc

 // 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.
 
 #include "content/renderer/accessibility/renderer_accessibility_complete.h"
 
 #include <queue>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 55 matching lines @@
     IPC_MESSAGE_HANDLER(AccessibilityMsg_DoDefaultAction,
                         OnDoDefaultAction)
     IPC_MESSAGE_HANDLER(AccessibilityMsg_Events_ACK,
                         OnEventsAck)
     IPC_MESSAGE_HANDLER(AccessibilityMsg_ScrollToMakeVisible,
                         OnScrollToMakeVisible)
     IPC_MESSAGE_HANDLER(AccessibilityMsg_ScrollToPoint,
                         OnScrollToPoint)
     IPC_MESSAGE_HANDLER(AccessibilityMsg_SetTextSelection,
                         OnSetTextSelection)
+    IPC_MESSAGE_HANDLER(AccessibilityMsg_HitTest, OnHitTest)
     IPC_MESSAGE_HANDLER(AccessibilityMsg_FatalError, OnFatalError)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void RendererAccessibilityComplete::FocusedNodeChanged(const WebNode& node) {
   const WebDocument& document = GetMainDocument();
   if (document.isNull())
     return;
@@ skipping 250 matching lines @@
   blink::WebNode node = obj.node();
   if (!node.isNull() && node.isElementNode()) {
     blink::WebElement element = node.to<blink::WebElement>();
     blink::WebInputElement* input_element =
         blink::toWebInputElement(&element);
     if (input_element && input_element->isTextField())
       input_element->setSelectionRange(start_offset, end_offset);
   }
 }
 
+void RendererAccessibilityComplete::OnHitTest(gfx::Point point) {
+  const WebDocument& document = GetMainDocument();
+  if (document.isNull())
+    return;
+  WebAXObject root_obj = document.accessibilityObject();
+  if (!root_obj.updateBackingStoreAndCheckValidity())
+    return;
+
+  WebAXObject obj = root_obj.hitTest(point);
+  if (!obj.isDetached())
+    HandleAXEvent(obj, ui::AX_EVENT_HOVER);
+}
+
 void RendererAccessibilityComplete::OnEventsAck() {
   DCHECK(ack_pending_);
   ack_pending_ = false;
   SendPendingAccessibilityEvents();
 }
 
 void RendererAccessibilityComplete::OnSetFocus(int acc_obj_id) {
   const WebDocument& document = GetMainDocument();
   if (document.isNull())
     return;
@@ skipping 21 matching lines @@
     render_view()->GetWebView()->clearFocusedElement();
   else
     obj.setFocused(true);
 }
 
 void RendererAccessibilityComplete::OnFatalError() {
   CHECK(false) << "Invalid accessibility tree.";
 }
 
 }  // namespace content