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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_ICON_EXTRACTOR_H_
      6 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_ICON_EXTRACTOR_H_
      7 
      8 #include <string>
      9 
     10 #include "base/callback.h"
     11 #include "base/files/file_path.h"
     12 #include "chrome/browser/icon_loader.h"
     13 
     14 // Helper class for DownloadsGetFileIconFunction. Only used for a single icon
     15 // extraction.
     16 class DownloadFileIconExtractor {
     17  public:
     18   // Callback for |ExtractIconForPath|. The parameter is a URL as a string for a
     19   // suitable icon. The string could be empty if the icon could not be
     20   // determined.
     21   typedef base::Callback<void(const std::string&)> IconURLCallback;
     22 
     23   virtual ~DownloadFileIconExtractor() {}
     24 
     25   // Should return false if the request was invalid.  If the return value is
     26   // true, then |callback| should be called with the result.
     27   virtual bool ExtractIconURLForPath(const base::FilePath& path,
     28                                      IconLoader::IconSize icon_size,
     29                                      IconURLCallback callback) = 0;
     30 };
     31 
     32 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_ICON_EXTRACTOR_H_
     33