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// Copyright (c) 2010 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.
// Maps hostnames to custom zoom levels. Written on the UI thread and read on
// any thread. One instance per profile.
#ifndef CHROME_BROWSER_HOST_ZOOM_MAP_H_
#define CHROME_BROWSER_HOST_ZOOM_MAP_H_
#pragma once
#include <map>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/lock.h"
#include "base/ref_counted.h"
#include "chrome/browser/prefs/pref_change_registrar.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"
class GURL;
class PrefService;
class Profile;
class HostZoomMap : public NotificationObserver,
public base::RefCountedThreadSafe<HostZoomMap> {
public:
explicit HostZoomMap(Profile* profile);
static void RegisterUserPrefs(PrefService* prefs);
// Returns the zoom level for a given url. The zoom level is determined by
// the host portion of the URL, or (in the absence of a host) the complete
// spec of the URL. In most cases, there is no custom zoom level, and this
// returns the user's default zoom level. Otherwise, returns the saved zoom
// level, which may be positive (to zoom in) or negative (to zoom out).
//
// This may be called on any thread.
double GetZoomLevel(const GURL& url) const;
// Sets the zoom level for a given url to |level|. If the level matches the
// current default zoom level, the host is erased from the saved preferences;
// otherwise the new value is written out.
//
// This should only be called on the UI thread.
void SetZoomLevel(const GURL& url, double level);
// Returns the temporary zoom level that's only valid for the lifetime of
// the given tab (i.e. isn't saved and doesn't affect other tabs) if it
// exists, the default zoom level otherwise.
//
// This may be called on any thread.
double GetTemporaryZoomLevel(int render_process_id,
int render_view_id) const;
// Sets the temporary zoom level that's only valid for the lifetime of this
// tab.
//
// This should only be called on the UI thread.
void SetTemporaryZoomLevel(int render_process_id,
int render_view_id,
double level);
// Resets all zoom levels.
//
// This should only be called on the UI thread.
void ResetToDefaults();
// NotificationObserver implementation.
virtual void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
private:
friend class base::RefCountedThreadSafe<HostZoomMap>;
typedef std::map<std::string, double> HostZoomLevels;
~HostZoomMap();
// Reads the zoom levels from the preferences service.
void Load();
// Removes dependencies on the profile so we can live longer than
// the profile without crashing.
void Shutdown();
// The profile we're associated with.
Profile* profile_;
// Copy of the pref data, so that we can read it on the IO thread.
HostZoomLevels host_zoom_levels_;
double default_zoom_level_;
struct TemporaryZoomLevel {
int render_process_id;
int render_view_id;
double zoom_level;
};
// Don't expect more than a couple of tabs that are using a temporary zoom
// level, so vector is fine for now.
std::vector<TemporaryZoomLevel> temporary_zoom_levels_;
// Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and
// |temporary_zoom_levels_| to guarantee thread safety.
mutable Lock lock_;
// Whether we are currently updating preferences, this is used to ignore
// notifications from the preference service that we triggered ourself.
bool updating_preferences_;
NotificationRegistrar registrar_;
PrefChangeRegistrar pref_change_registrar_;
DISALLOW_COPY_AND_ASSIGN(HostZoomMap);
};
#endif // CHROME_BROWSER_HOST_ZOOM_MAP_H_
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