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      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 #include "ui/aura/scoped_window_targeter.h"
      6 
      7 #include "ui/aura/window.h"
      8 
      9 namespace aura {
     10 
     11 ScopedWindowTargeter::ScopedWindowTargeter(
     12     Window* window,
     13     scoped_ptr<ui::EventTargeter> new_targeter)
     14     : window_(window),
     15       old_targeter_(window->SetEventTargeter(new_targeter.Pass())) {
     16   window_->AddObserver(this);
     17 }
     18 
     19 ScopedWindowTargeter::~ScopedWindowTargeter() {
     20   if (window_) {
     21     window_->RemoveObserver(this);
     22     window_->SetEventTargeter(old_targeter_.Pass());
     23   }
     24 }
     25 
     26 void ScopedWindowTargeter::OnWindowDestroyed(Window* window) {
     27   CHECK_EQ(window_, window);
     28   window_ = NULL;
     29   old_targeter_.reset();
     30 }
     31 
     32 }  // namespace aura
     33