content/test/accessibility_browser_test_utils.h

   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/view_message_enums.h"
  10 #include "ui/accessibility/ax_node_data.h"
  11 #include "ui/accessibility/ax_tree.h"
  12
  13 namespace content {
  14
  15 class MessageLoopRunner;
  16 class RenderViewHostImpl;
  17 class Shell;
  18
  19 // Create an instance of this class *before* doing any operation that
  20 // might generate an accessibility event (like a page navigation or
  21 // clicking on a button). Then call WaitForNotification
  22 // afterwards to block until the specified accessibility notification has been
  23 // received.
  24 class AccessibilityNotificationWaiter {
  25  public:
  26   AccessibilityNotificationWaiter(
  27       Shell* shell,
  28       AccessibilityMode accessibility_mode,
  29       ui::AXEvent event);
  30   ~AccessibilityNotificationWaiter();
  31
  32   // Blocks until the specific accessibility notification registered in
  33   // AccessibilityNotificationWaiter is received. Ignores notifications for
  34   // "about:blank".
  35   void WaitForNotification();
  36
  37   // After WaitForNotification has returned, this will retrieve
  38   // the tree of accessibility nodes received from the renderer process.
  39   const ui::AXTree& GetAXTree() const;
  40
  41  private:
  42   // Callback from RenderViewHostImpl.
  43   void OnAccessibilityEvent(ui::AXEvent event);
  44
  45   // Helper function to determine if the accessibility tree in
  46   // GetAXTree() is about the page with the url "about:blank".
  47   bool IsAboutBlank();
  48
  49   Shell* shell_;
  50   RenderViewHostImpl* view_host_;
  51   ui::AXEvent 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_