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// Copyright (c) 2011 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 browser context.
#ifndef CONTENT_BROWSER_HOST_ZOOM_MAP_H_
#define CONTENT_BROWSER_HOST_ZOOM_MAP_H_
#pragma once
#include <map>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/message_loop_helpers.h"
#include "base/synchronization/lock.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
// HostZoomMap needs to be deleted on the UI thread because it listens
// to notifications on there (and holds a NotificationRegistrar).
class CONTENT_EXPORT HostZoomMap
: public content::NotificationObserver,
public base::RefCountedThreadSafe<
HostZoomMap, content::BrowserThread::DeleteOnUIThread> {
public:
HostZoomMap();
// Copy the zoom levels from the given map. Can only be called on the UI
// thread.
void CopyFrom(HostZoomMap* copy);
// Returns the zoom level for the host or spec 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 std::string& host) const;
// Sets the zoom level for the host or spec 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(std::string host, 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);
// content::NotificationObserver implementation.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
double default_zoom_level() const { return default_zoom_level_; }
void set_default_zoom_level(double level) { default_zoom_level_ = level; }
private:
friend class base::RefCountedThreadSafe<
HostZoomMap, content::BrowserThread::DeleteOnUIThread>;
friend struct content::BrowserThread::DeleteOnThread<
content::BrowserThread::UI>;
friend class base::DeleteHelper<HostZoomMap>;
typedef std::map<std::string, double> HostZoomLevels;
virtual ~HostZoomMap();
// 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 base::Lock lock_;
content::NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(HostZoomMap);
};
#endif // CONTENT_BROWSER_HOST_ZOOM_MAP_H_
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