components/view_manager/public/cpp/view_tracker.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 "components/view_manager/public/cpp/view_tracker.h"
   6
   7 namespace mojo {
   8
   9 ViewTracker::ViewTracker() {
  10 }
  11
  12 ViewTracker::~ViewTracker() {
  13   for (Views::iterator i = views_.begin(); i != views_.end(); ++i)
  14     (*i)->RemoveObserver(this);
  15 }
  16
  17 void ViewTracker::Add(View* view) {
  18   if (views_.count(view))
  19     return;
  20
  21   view->AddObserver(this);
  22   views_.insert(view);
  23 }
  24
  25 void ViewTracker::Remove(View* view) {
  26   if (views_.count(view)) {
  27     views_.erase(view);
  28     view->RemoveObserver(this);
  29   }
  30 }
  31
  32 bool ViewTracker::Contains(View* view) {
  33   return views_.count(view) > 0;
  34 }
  35
  36 void ViewTracker::OnViewDestroying(View* view) {
  37   DCHECK_GT(views_.count(view), 0u);
  38   Remove(view);
  39 }
  40
  41 }  // namespace mojo