ui/events/null_event_targeter.h

   1 // Copyright 2015 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 #include "base/compiler_specific.h"
   6 #include "base/macros.h"
   7 #include "ui/events/event_targeter.h"
   8 #include "ui/events/events_export.h"
   9
  10 namespace ui {
  11
  12 // NullEventTargeter can be installed on a root window to prevent it from
  13 // dispatching events such as during shutdown.
  14 class EVENTS_EXPORT NullEventTargeter : public EventTargeter {
  15  public:
  16   NullEventTargeter();
  17   ~NullEventTargeter() override;
  18
  19   // EventTargeter:
  20   EventTarget* FindTargetForEvent(EventTarget* root, Event* event) override;
  21   EventTarget* FindNextBestTarget(EventTarget* previous_target,
  22                                   Event* event) override;
  23
  24  private:
  25   DISALLOW_COPY_AND_ASSIGN(NullEventTargeter);
  26 };
  27
  28 }  // namespace ui