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/accessibility_mode_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 RenderFrameHostImpl;
  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   explicit AccessibilityNotificationWaiter(Shell* shell);
  27   AccessibilityNotificationWaiter(
  28       Shell* shell,
  29       AccessibilityMode accessibility_mode,
  30       ui::AXEvent event);
  31   AccessibilityNotificationWaiter(
  32       RenderFrameHostImpl* frame_host,
  33        ui::AXEvent event);
  34   ~AccessibilityNotificationWaiter();
  35
  36   // Blocks until the specific accessibility notification registered in
  37   // AccessibilityNotificationWaiter is received. Ignores notifications for
  38   // "about:blank".
  39   void WaitForNotification();
  40
  41   // After WaitForNotification has returned, this will retrieve
  42   // the tree of accessibility nodes received from the renderer process.
  43   const ui::AXTree& GetAXTree() const;
  44
  45   // After WaitForNotification returns, use this to retrieve the id of the
  46   // node that was the target of the event.
  47   int event_target_id() { return event_target_id_; }
  48
  49  private:
  50   // Callback from RenderViewHostImpl.
  51   void OnAccessibilityEvent(ui::AXEvent event, int event_target_id);
  52
  53   // Helper function to determine if the accessibility tree in
  54   // GetAXTree() is about the page with the url "about:blank".
  55   bool IsAboutBlank();
  56
  57   RenderFrameHostImpl* frame_host_;
  58   ui::AXEvent event_to_wait_for_;
  59   scoped_refptr<MessageLoopRunner> loop_runner_;
  60   base::WeakPtrFactory<AccessibilityNotificationWaiter> weak_factory_;
  61   int event_target_id_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(AccessibilityNotificationWaiter);
  64 };
  65
  66 }  // namespace content
  67
  68 #endif  // CONTENT_TEST_ACCESSIBILITY_BROWSER_TEST_UTILS_H_