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