blob: 221bdf46a4b93358d435f0685c137fc8399ac8b4 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "components/prefs/json_pref_store.h"
#include "components/prefs/pref_change_registrar.h"
#include "components/prefs/pref_service.h"
#include "components/prefs/pref_store.h"
#include "content/public/browser/host_zoom_map.h"
#include "content/public/browser/zoom_level_delegate.h"
namespace base {
class DictionaryValue;
namespace zoom {
class ZoomEventManager;
// A class to manage per-partition default and per-host zoom levels in Chrome's
// preference system. It implements an interface between the content/ zoom
// levels in HostZoomMap and Chrome's preference system. All changes
// to the per-partition default zoom levels from chrome/ flow through this
// class. Any changes to per-host levels are updated when HostZoomMap calls
// OnZoomLevelChanged.
class ChromeZoomLevelPrefs : public content::ZoomLevelDelegate {
typedef base::CallbackList<void(void)>::Subscription
// Initialize the pref_service and the partition_key via the constructor,
// as these concepts won't be available in the content base class
// ZoomLevelDelegate, which will define the InitHostZoomMap interface.
// |pref_service_| must outlive this class.
PrefService* pref_service,
const base::FilePath& profile_path,
const base::FilePath& partition_path,
base::WeakPtr<zoom::ZoomEventManager> zoom_event_manager);
~ChromeZoomLevelPrefs() override;
static std::string GetPartitionKeyForTesting(
const base::FilePath& relative_path);
void SetDefaultZoomLevelPref(double level);
double GetDefaultZoomLevelPref() const;
RegisterDefaultZoomLevelCallback(const base::Closure& callback);
void ExtractPerHostZoomLevels(
const base::DictionaryValue* host_zoom_dictionary,
bool sanitize_partition_host_zoom_levels);
// content::ZoomLevelDelegate
void InitHostZoomMap(content::HostZoomMap* host_zoom_map) override;
// This is a callback function that receives notifications from HostZoomMap
// when per-host zoom levels change. It is used to update the per-host
// zoom levels (if any) managed by this class (for its associated partition).
void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change);
// |partition_key_| used to be a hash as returned by
// std::hash<std::string>. These functions check for zoom settings
// under the old key and copies them to the new one only if there is
// not already a new setting.
// TODO(thomasanderson): Remove these after Chrome M65 has reached
// stable.
void MigrateOldZoomPreferences(const base::FilePath& partition_relative_path);
void MigrateOldZoomPreferencesForKeys(const std::string& old_key,
const std::string& new_key);
PrefService* pref_service_;
base::WeakPtr<zoom::ZoomEventManager> zoom_event_manager_;
content::HostZoomMap* host_zoom_map_;
std::unique_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
std::string partition_key_;
base::CallbackList<void(void)> default_zoom_changed_callbacks_;