chrome/browser/ui/zoom/chrome_zoom_level_otr_delegate.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 "chrome/browser/ui/zoom/chrome_zoom_level_otr_delegate.h"
   6
   7 #include "base/bind.h"
   8 #include "components/ui/zoom/zoom_event_manager.h"
   9
  10 namespace chrome {
  11
  12 ChromeZoomLevelOTRDelegate::ChromeZoomLevelOTRDelegate(
  13     base::WeakPtr<ui_zoom::ZoomEventManager> zoom_event_manager)
  14     : zoom_event_manager_(zoom_event_manager), host_zoom_map_(nullptr) {
  15 }
  16
  17 ChromeZoomLevelOTRDelegate::~ChromeZoomLevelOTRDelegate() {
  18 }
  19
  20 void ChromeZoomLevelOTRDelegate::InitHostZoomMap(
  21     content::HostZoomMap* host_zoom_map) {
  22   // This init function must be called only once.
  23   DCHECK(!host_zoom_map_);
  24   DCHECK(host_zoom_map);
  25   host_zoom_map_ = host_zoom_map;
  26
  27   zoom_subscription_ = host_zoom_map_->AddZoomLevelChangedCallback(base::Bind(
  28       &ChromeZoomLevelOTRDelegate::OnZoomLevelChanged, base::Unretained(this)));
  29 }
  30
  31 void ChromeZoomLevelOTRDelegate::OnZoomLevelChanged(
  32     const content::HostZoomMap::ZoomLevelChange& change) {
  33   // If there's a manager to aggregate ZoomLevelChanged events, pass this event
  34   // along. Since we already hold a subscription to our associated HostZoomMap,
  35   // we don't need to create a separate subscription for this.
  36   if (zoom_event_manager_)
  37     zoom_event_manager_->OnZoomLevelChanged(change);
  38 }
  39
  40 }  // namespace chrome