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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 CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_
#define CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_
#include <string>
#include "base/file_path.h"
#include "chrome/browser/icon_manager.h"
#include "chrome/common/cancelable_task_tracker.h"
#include "content/public/browser/url_data_source.h"
#include "ui/base/layout.h"
namespace gfx {
class Image;
}
// FileIconSource is the gateway between network-level chrome:
// requests for favicons and the history backend that serves these.
class FileIconSource : public content::URLDataSource {
public:
explicit FileIconSource();
// content::URLDataSource implementation.
virtual std::string GetSource() OVERRIDE;
virtual void StartDataRequest(
const std::string& path,
bool is_incognito,
const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
virtual std::string GetMimeType(const std::string&) const OVERRIDE;
protected:
virtual ~FileIconSource();
// Once the |path| and |icon_size| has been determined from the request, this
// function is called to perform the actual fetch. Declared as virtual for
// testing.
virtual void FetchFileIcon(
const base::FilePath& path,
ui::ScaleFactor scale_factor,
IconLoader::IconSize icon_size,
const content::URLDataSource::GotDataCallback& callback);
private:
// Contains the necessary information for completing an icon fetch request.
struct IconRequestDetails {
IconRequestDetails();
~IconRequestDetails();
// The callback to run with the response.
content::URLDataSource::GotDataCallback callback;
// The requested scale factor to respond with.
ui::ScaleFactor scale_factor;
};
// Called when favicon data is available from the history backend.
void OnFileIconDataAvailable(const IconRequestDetails& details,
gfx::Image* icon);
// Tracks tasks requesting file icons.
CancelableTaskTracker cancelable_task_tracker_;
DISALLOW_COPY_AND_ASSIGN(FileIconSource);
};
#endif // CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_
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