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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 CONTENT_BROWSER_HOST_ZOOM_LEVEL_CONTEXT_H_
#define CONTENT_BROWSER_HOST_ZOOM_LEVEL_CONTEXT_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/browser/host_zoom_map_impl.h"
#include "content/public/browser/zoom_level_delegate.h"
class PrefService;
namespace content {
struct HostZoomLevelContextDeleter;
// This class manages a HostZoomMap and associates it with a ZoomLevelDelegate,
// if one is provided. It also serves to keep the zoom level machinery details
// separate from the owning StoragePartitionImpl.
class HostZoomLevelContext
: public base::RefCountedThreadSafe<HostZoomLevelContext,
HostZoomLevelContextDeleter> {
public:
explicit HostZoomLevelContext(
scoped_ptr<ZoomLevelDelegate> zoom_level_delegate);
HostZoomMap* GetHostZoomMap() const { return host_zoom_map_impl_.get(); }
ZoomLevelDelegate* GetZoomLevelDelegate() const {
return zoom_level_delegate_.get();
}
protected:
virtual ~HostZoomLevelContext();
private:
friend class base::DeleteHelper<HostZoomLevelContext>;
friend class base::RefCountedThreadSafe<HostZoomLevelContext,
HostZoomLevelContextDeleter>;
friend struct HostZoomLevelContextDeleter;
void DeleteOnCorrectThread() const;
scoped_ptr<HostZoomMapImpl> host_zoom_map_impl_;
// Release the delegate before the HostZoomMap, in case it is carrying
// any HostZoomMap::Subscription pointers.
scoped_ptr<ZoomLevelDelegate> zoom_level_delegate_;
DISALLOW_COPY_AND_ASSIGN(HostZoomLevelContext);
};
struct HostZoomLevelContextDeleter {
static void Destruct(const HostZoomLevelContext* context) {
context->DeleteOnCorrectThread();
}
};
} // namespace content
#endif // CONTENT_BROWSER_HOST_ZOOM_LEVEL_CONTEXT_H_
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