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// Copyright (c) 2009 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 CHROME_BROWSER_DOM_UI_DOM_UI_THUMBNAIL_SOURCE_H_
#define CHROME_BROWSER_DOM_UI_DOM_UI_THUMBNAIL_SOURCE_H_
#include <string>
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
#include "chrome/browser/history/history.h"
class Profile;
// ThumbnailSource is the gateway between network-level chrome:
// requests for thumbnails and the history backend that serves these.
class DOMUIThumbnailSource : public ChromeURLDataManager::DataSource {
public:
explicit DOMUIThumbnailSource(Profile* profile);
// Called when the network layer has requested a resource underneath
// the path we registered.
virtual void StartDataRequest(const std::string& path, int request_id);
virtual std::string GetMimeType(const std::string&) const {
// We need to explicitly return a mime type, otherwise if the user tries to
// drag the image they get no extension.
return "image/png";
}
// Called when thumbnail data is available from the history backend.
void OnThumbnailDataAvailable(HistoryService::Handle request_handle,
scoped_refptr<RefCountedBytes> data);
private:
Profile* profile_;
CancelableRequestConsumerT<int, 0> cancelable_consumer_;
// Raw PNG representation of the thumbnail to show when the thumbnail
// database doesn't have a thumbnail for a webpage.
scoped_refptr<RefCountedBytes> default_thumbnail_;
DISALLOW_COPY_AND_ASSIGN(DOMUIThumbnailSource);
};
#endif // CHROME_BROWSER_DOM_UI_DOM_UI_THUMBNAIL_SOURCE_H_
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