components/ui/zoom/zoom_event_manager.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/ui/zoom/zoom_event_manager.h"
   6
   7 #include "components/ui/zoom/zoom_event_manager_observer.h"
   8 #include "content/public/browser/browser_context.h"
   9
  10 namespace {
  11 static const char kBrowserZoomEventManager[] = "browser_zoom_event_manager";
  12 }
  13
  14 namespace ui_zoom {
  15
  16 ZoomEventManager* ZoomEventManager::GetForBrowserContext(
  17     content::BrowserContext* context) {
  18   if (!context->GetUserData(kBrowserZoomEventManager))
  19     context->SetUserData(kBrowserZoomEventManager, new ZoomEventManager);
  20   return static_cast<ZoomEventManager*>(
  21       context->GetUserData(kBrowserZoomEventManager));
  22 }
  23
  24 ZoomEventManager::ZoomEventManager() : weak_ptr_factory_(this) {
  25 }
  26
  27 ZoomEventManager::~ZoomEventManager() {
  28 }
  29
  30 void ZoomEventManager::OnZoomLevelChanged(
  31     const content::HostZoomMap::ZoomLevelChange& change) {
  32   zoom_level_changed_callbacks_.Notify(change);
  33 }
  34
  35 scoped_ptr<content::HostZoomMap::Subscription>
  36 ZoomEventManager::AddZoomLevelChangedCallback(
  37     const content::HostZoomMap::ZoomLevelChangedCallback& callback) {
  38   return zoom_level_changed_callbacks_.Add(callback);
  39 }
  40
  41 void ZoomEventManager::OnDefaultZoomLevelChanged() {
  42   FOR_EACH_OBSERVER(ZoomEventManagerObserver, observers_,
  43                     OnDefaultZoomLevelChanged());
  44 }
  45
  46 void ZoomEventManager::AddZoomEventManagerObserver(
  47     ZoomEventManagerObserver* observer) {
  48   observers_.AddObserver(observer);
  49 }
  50
  51 void ZoomEventManager::RemoveZoomEventManagerObserver(
  52     ZoomEventManagerObserver* observer) {
  53   observers_.RemoveObserver(observer);
  54 }
  55
  56 }  // namespace ui_zoom