chrome/browser/download/download_file_icon_extractor.h

   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                                      float scale,
  29                                      IconLoader::IconSize icon_size,
  30                                      IconURLCallback callback) = 0;
  31 };
  32
  33 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_ICON_EXTRACTOR_H_