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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_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
#define CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
#include <map>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/callback.h"
#include "content/common/content_export.h"
namespace content {
class BrowserContext;
class ResourceContext;
// Maps hostnames to custom zoom levels. Written on the UI thread and read on
// any thread. One instance per browser context. Must be created on the UI
// thread, and it'll delete itself on the UI thread as well.
class HostZoomMap {
public:
CONTENT_EXPORT static HostZoomMap* GetForBrowserContext(
BrowserContext* browser_context);
// Copy the zoom levels from the given map. Can only be called on the UI
// thread.
virtual void CopyFrom(HostZoomMap* copy) = 0;
// 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.
virtual double GetZoomLevel(const std::string& host) const = 0;
// 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.
virtual void SetZoomLevel(const std::string& host, double level) = 0;
// Get/Set the default zoom level for pages that don't override it.
virtual double GetDefaultZoomLevel() const = 0;
virtual void SetDefaultZoomLevel(double level) = 0;;
typedef base::Callback<void(const std::string&)> ZoomLevelChangedCallback;
// Add and remove zoom level changed callbacks.
virtual void AddZoomLevelChangedCallback(
const ZoomLevelChangedCallback& callback) = 0;
virtual void RemoveZoomLevelChangedCallback(
const ZoomLevelChangedCallback& callback) = 0;
protected:
virtual ~HostZoomMap() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
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