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      1 // Copyright (c) 2012 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_tracker.h"
      6 
      7 #include "ui/aura/window.h"
      8 
      9 namespace aura {
     10 
     11 WindowTracker::WindowTracker() {
     12 }
     13 
     14 WindowTracker::~WindowTracker() {
     15   for (Windows::iterator i = windows_.begin(); i != windows_.end(); ++i)
     16     (*i)->RemoveObserver(this);
     17 }
     18 
     19 void WindowTracker::Add(Window* window) {
     20   if (windows_.count(window))
     21     return;
     22 
     23   window->AddObserver(this);
     24   windows_.insert(window);
     25 }
     26 
     27 void WindowTracker::Remove(Window* window) {
     28   if (windows_.count(window)) {
     29     windows_.erase(window);
     30     window->RemoveObserver(this);
     31   }
     32 }
     33 
     34 bool WindowTracker::Contains(Window* window) {
     35   return windows_.count(window) > 0;
     36 }
     37 
     38 void WindowTracker::OnWindowDestroying(Window* window) {
     39   DCHECK_GT(windows_.count(window), 0u);
     40   Remove(window);
     41 }
     42 
     43 }  // namespace aura
     44