Home | History | Annotate | Download | only in aura 
      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   virtual ~ScopedWindowTargeter();
     29 
     30   ui::EventTargeter* old_targeter() {
     31     return old_targeter_.get();
     32   }
     33 
     34  private:
     35   // WindowObserver:
     36   virtual 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_
     47