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// Copyright (c) 2012 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 CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
#define CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
#include <map>
#include <string>
#include <vector>
#include "base/compiler_specific.h"
#include "base/sequenced_task_runner_helpers.h"
#include "base/supports_user_data.h"
#include "base/synchronization/lock.h"
#include "content/public/browser/host_zoom_map.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
namespace content {
class WebContentsImpl;
// HostZoomMap needs to be deleted on the UI thread because it listens
// to notifications on there (and holds a NotificationRegistrar).
class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
public NotificationObserver,
public base::SupportsUserData::Data {
public:
HostZoomMapImpl();
virtual ~HostZoomMapImpl();
// HostZoomMap implementation:
virtual void CopyFrom(HostZoomMap* copy) OVERRIDE;
virtual double GetZoomLevelForHostAndScheme(
const std::string& scheme,
const std::string& host) const OVERRIDE;
virtual ZoomLevelVector GetAllZoomLevels() const OVERRIDE;
virtual void SetZoomLevelForHost(
const std::string& host,
double level) OVERRIDE;
virtual void SetZoomLevelForHostAndScheme(
const std::string& scheme,
const std::string& host,
double level) OVERRIDE;
virtual double GetDefaultZoomLevel() const OVERRIDE;
virtual void SetDefaultZoomLevel(double level) OVERRIDE;
virtual scoped_ptr<Subscription> AddZoomLevelChangedCallback(
const ZoomLevelChangedCallback& callback) OVERRIDE;
// Returns the current zoom level for the specified WebContents. This may
// be a temporary zoom level, depending on UsesTemporaryZoomLevel().
double GetZoomLevelForWebContents(
const WebContentsImpl& web_contents_impl) const;
// Sets the zoom level for this WebContents. If this WebContents is using
// a temporary zoom level, then level is only applied to this WebContents.
// Otherwise, the level will be applied on a host level.
void SetZoomLevelForWebContents(const WebContentsImpl& web_contents_impl,
double level);
// Sets the zoom level for the specified view. The level may be set for only
// this view, or for the host, depending on UsesTemporaryZoomLevel().
void SetZoomLevelForView(int render_process_id,
int render_view_id,
double level,
const std::string& host);
// Returns whether the view manages its zoom level independently of other tabs
// displaying content from the same host.
bool UsesTemporaryZoomLevel(int render_process_id, int render_view_id) const;
// Sets whether the view manages its zoom level independently of other tabs
// displaying content from the same host, based on whether
// |uses_temporary_zoom_level| is true.
void SetUsesTemporaryZoomLevel(int render_process_id,
int render_view_id,
bool uses_temporary_zoom_level);
// Returns the temporary zoom level that's only valid for the lifetime of
// the given WebContents (i.e. isn't saved and doesn't affect other
// WebContentses) 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
// WebContents.
//
// This should only be called on the UI thread.
void SetTemporaryZoomLevel(int render_process_id,
int render_view_id,
double level);
// NotificationObserver implementation.
virtual void Observe(int type,
const NotificationSource& source,
const NotificationDetails& details) OVERRIDE;
private:
typedef std::map<std::string, double> HostZoomLevels;
typedef std::map<std::string, HostZoomLevels> SchemeHostZoomLevels;
struct TemporaryZoomLevel {
TemporaryZoomLevel(int process_id, int view_id, double level);
TemporaryZoomLevel(int process_id, int view_id);
bool operator==(const TemporaryZoomLevel& other) const;
int render_process_id;
int render_view_id;
double zoom_level;
};
typedef std::vector<TemporaryZoomLevel> TemporaryZoomLevels;
double GetZoomLevelForHost(const std::string& host) const;
// Callbacks called when zoom level changes.
base::CallbackList<void(const ZoomLevelChange&)>
zoom_level_changed_callbacks_;
// Copy of the pref data, so that we can read it on the IO thread.
HostZoomLevels host_zoom_levels_;
SchemeHostZoomLevels scheme_host_zoom_levels_;
double default_zoom_level_;
// Don't expect more than a couple of tabs that are using a temporary zoom
// level, so vector is fine for now.
TemporaryZoomLevels 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_;
NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(HostZoomMapImpl);
};
} // namespace content
#endif // CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
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