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