ui/aura/window_observer.cc

   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/window_observer.h"
   6
   7 #include "base/logging.h"
   8 #include "ui/aura/window.h"
   9
  10 namespace aura {
  11
  12 WindowObserver::WindowObserver() : observing_(0) {
  13 }
  14
  15 WindowObserver::~WindowObserver() {
  16   CHECK_EQ(0, observing_);
  17 }
  18
  19 void WindowObserver::OnObservingWindow(aura::Window* window) {
  20   if (!window->HasObserver(this))
  21     observing_++;
  22 }
  23
  24 void WindowObserver::OnUnobservingWindow(aura::Window* window) {
  25   if (window->HasObserver(this))
  26     observing_--;
  27 }
  28
  29 }  // namespace aura