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// 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.
#ifndef CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_
#define CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_
#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 "base/prefs/json_pref_store.h"
#include "base/prefs/pref_change_registrar.h"
#include "base/prefs/pref_service.h"
#include "base/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 ui_zoom {
class ZoomEventManager;
}
namespace chrome {
// 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 {
public:
typedef base::CallbackList<void(void)>::Subscription
DefaultZoomLevelSubscription;
// 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.
ChromeZoomLevelPrefs(
PrefService* pref_service,
const base::FilePath& profile_path,
const base::FilePath& partition_path,
base::WeakPtr<ui_zoom::ZoomEventManager> zoom_event_manager);
~ChromeZoomLevelPrefs() override;
static std::string GetHashForTesting(const base::FilePath& relative_path);
void SetDefaultZoomLevelPref(double level);
double GetDefaultZoomLevelPref() const;
scoped_ptr<DefaultZoomLevelSubscription> 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;
private:
// 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);
PrefService* pref_service_;
base::WeakPtr<ui_zoom::ZoomEventManager> zoom_event_manager_;
content::HostZoomMap* host_zoom_map_;
scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
std::string partition_key_;
base::CallbackList<void(void)> default_zoom_changed_callbacks_;
DISALLOW_COPY_AND_ASSIGN(ChromeZoomLevelPrefs);
};
} // namespace chrome
#endif // CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_
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