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_UI_WEBUI_FILEICON_SOURCE_H_ 6 #define CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_ 7 8 #include <string> 9 10 #include "base/files/file_path.h" 11 #include "base/task/cancelable_task_tracker.h" 12 #include "chrome/browser/icon_manager.h" 13 #include "content/public/browser/url_data_source.h" 14 15 namespace gfx { 16 class Image; 17 } 18 19 // FileIconSource is the gateway between network-level chrome: 20 // requests for favicons and the history backend that serves these. 21 class FileIconSource : public content::URLDataSource { 22 public: 23 explicit FileIconSource(); 24 25 // content::URLDataSource implementation. 26 virtual std::string GetSource() const OVERRIDE; 27 virtual void StartDataRequest( 28 const std::string& path, 29 int render_process_id, 30 int render_frame_id, 31 const content::URLDataSource::GotDataCallback& callback) OVERRIDE; 32 virtual std::string GetMimeType(const std::string&) const OVERRIDE; 33 34 protected: 35 virtual ~FileIconSource(); 36 37 // Once the |path| and |icon_size| has been determined from the request, this 38 // function is called to perform the actual fetch. Declared as virtual for 39 // testing. 40 virtual void FetchFileIcon( 41 const base::FilePath& path, 42 float scale_factor, 43 IconLoader::IconSize icon_size, 44 const content::URLDataSource::GotDataCallback& callback); 45 46 private: 47 // Contains the necessary information for completing an icon fetch request. 48 struct IconRequestDetails { 49 IconRequestDetails(); 50 ~IconRequestDetails(); 51 52 // The callback to run with the response. 53 content::URLDataSource::GotDataCallback callback; 54 55 // The requested scale factor to respond with. 56 float scale_factor; 57 }; 58 59 // Called when favicon data is available from the history backend. 60 void OnFileIconDataAvailable(const IconRequestDetails& details, 61 gfx::Image* icon); 62 63 // Tracks tasks requesting file icons. 64 base::CancelableTaskTracker cancelable_task_tracker_; 65 66 DISALLOW_COPY_AND_ASSIGN(FileIconSource); 67 }; 68 #endif // CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_ 69