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content / browser / host_zoom_level_context.h [blame]
// Copyright 2014 The Chromium Authors
// 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 <memory>
#include "content/browser/host_zoom_map_impl.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/zoom_level_delegate.h"
namespace content {
// 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. It must be destroyed on the
// UI thread.
class HostZoomLevelContext {
public:
explicit HostZoomLevelContext(
std::unique_ptr<ZoomLevelDelegate> zoom_level_delegate);
HostZoomLevelContext(const HostZoomLevelContext&) = delete;
HostZoomLevelContext& operator=(const HostZoomLevelContext&) = delete;
HostZoomMap* GetHostZoomMap() const { return host_zoom_map_impl_.get(); }
ZoomLevelDelegate* GetZoomLevelDelegate() const {
return zoom_level_delegate_.get();
}
private:
friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
friend class base::DeleteHelper<HostZoomLevelContext>;
~HostZoomLevelContext();
std::unique_ptr<HostZoomMapImpl> host_zoom_map_impl_;
// Release the delegate before the HostZoomMap, in case it is carrying
// any HostZoomMap::Subscription pointers.
std::unique_ptr<ZoomLevelDelegate> zoom_level_delegate_;
};
} // namespace content
#endif // CONTENT_BROWSER_HOST_ZOOM_LEVEL_CONTEXT_H_