ui/aura/scoped_window_targeter.h

   1 // Copyright 2014 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 UI_AURA_SCOPED_WINDOW_TARGETER_H_
   6 #define UI_AURA_SCOPED_WINDOW_TARGETER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "ui/aura/window_observer.h"
  11
  12 namespace ui {
  13 class EventTargeter;
  14 }
  15
  16 namespace aura {
  17
  18 class Window;
  19
  20 // ScopedWindowTargeter is used to temporarily replace the event-targeter for a
  21 // window. Upon construction, it installs a new targeter on the window, and upon
  22 // destruction, it restores the previous event-targeter on the window.
  23 class AURA_EXPORT ScopedWindowTargeter : public WindowObserver {
  24  public:
  25   ScopedWindowTargeter(Window* window,
  26                        scoped_ptr<ui::EventTargeter> new_targeter);
  27
  28   ~ScopedWindowTargeter() override;
  29
  30   ui::EventTargeter* old_targeter() {
  31     return old_targeter_.get();
  32   }
  33
  34  private:
  35   // WindowObserver:
  36   void OnWindowDestroyed(Window* window) override;
  37
  38   Window* window_;
  39   scoped_ptr<ui::EventTargeter> old_targeter_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(ScopedWindowTargeter);
  42 };
  43
  44 }  // namespace aura
  45
  46 #endif  // UI_AURA_SCOPED_WINDOW_TARGETER_H_