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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_TEST_ACCESSIBILITY_BROWSER_TEST_UTILS_H_
      6 #define CONTENT_TEST_ACCESSIBILITY_BROWSER_TEST_UTILS_H_
      7 
      8 #include "base/memory/weak_ptr.h"
      9 #include "content/common/accessibility_node_data.h"
     10 #include "content/common/view_message_enums.h"
     11 
     12 namespace content {
     13 
     14 class MessageLoopRunner;
     15 class RenderViewHostImpl;
     16 class Shell;
     17 
     18 // Create an instance of this class *before* doing any operation that
     19 // might generate an accessibility event (like a page navigation or
     20 // clicking on a button). Then call WaitForNotification
     21 // afterwards to block until the specified accessibility notification has been
     22 // received.
     23 class AccessibilityNotificationWaiter {
     24  public:
     25   AccessibilityNotificationWaiter(
     26       Shell* shell,
     27       AccessibilityMode accessibility_mode,
     28       blink::WebAXEvent event);
     29   ~AccessibilityNotificationWaiter();
     30 
     31   // Blocks until the specific accessibility notification registered in
     32   // AccessibilityNotificationWaiter is received. Ignores notifications for
     33   // "about:blank".
     34   void WaitForNotification();
     35 
     36   // After WaitForNotification has returned, this will retrieve
     37   // the tree of accessibility nodes received from the renderer process.
     38   const AccessibilityNodeDataTreeNode& GetAccessibilityNodeDataTree() const;
     39 
     40  private:
     41   // Callback from RenderViewHostImpl.
     42   void OnAccessibilityEvent(blink::WebAXEvent event);
     43 
     44   // Helper function to determine if the accessibility tree in
     45   // GetAccessibilityNodeDataTree() is about the page with the url
     46   // "about:blank".
     47   bool IsAboutBlank();
     48 
     49   Shell* shell_;
     50   RenderViewHostImpl* view_host_;
     51   blink::WebAXEvent event_to_wait_for_;
     52   scoped_refptr<MessageLoopRunner> loop_runner_;
     53   base::WeakPtrFactory<AccessibilityNotificationWaiter> weak_factory_;
     54 
     55   DISALLOW_COPY_AND_ASSIGN(AccessibilityNotificationWaiter);
     56 };
     57 
     58 }  // namespace content
     59 
     60 #endif  // CONTENT_TEST_ACCESSIBILITY_BROWSER_TEST_UTILS_H_
     61