chrome/browser/ui/webui/large_icon_source.h

   1 // Copyright 2015 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_LARGE_ICON_SOURCE_H_
   6 #define CHROME_BROWSER_UI_WEBUI_LARGE_ICON_SOURCE_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/task/cancelable_task_tracker.h"
  12 #include "components/favicon/core/fallback_icon_service.h"
  13 #include "content/public/browser/url_data_source.h"
  14
  15 namespace favicon {
  16 class FallbackIconService;
  17 class LargeIconService;
  18 }
  19
  20 namespace favicon_base {
  21 struct LargeIconResult;
  22 }
  23
  24 // LargeIconSource services explicit chrome:// requests for large icons.
  25 //
  26 // Format:
  27 //   chrome://large-icon/size/url
  28 //
  29 // Parameter:
  30 //  'size'             Required (including trailing '/')
  31 //    Positive integer to specify the large icon's size in pixels.
  32 //  'url'              Optional
  33 //    String to specify the page URL of the large icon.
  34 //
  35 //  Example: chrome://large-icon/48/http://www.google.com/
  36 //    This requests a 48x48 large icon for http://www.google.com.
  37 class LargeIconSource : public content::URLDataSource {
  38  public:
  39   // |fallback_icon_service| and |large_icon_service| are owned by caller and
  40   // may be null.
  41   LargeIconSource(favicon::FallbackIconService* fallback_icon_service,
  42                   favicon::LargeIconService* large_icon_service);
  43
  44   ~LargeIconSource() override;
  45
  46   // content::URLDataSource implementation.
  47   std::string GetSource() const override;
  48   void StartDataRequest(
  49       const std::string& path,
  50       int render_process_id,
  51       int render_frame_id,
  52       const content::URLDataSource::GotDataCallback& callback) override;
  53   std::string GetMimeType(const std::string&) const override;
  54   bool ShouldReplaceExistingSource() const override;
  55   bool ShouldServiceRequest(const net::URLRequest* request) const override;
  56
  57  private:
  58   // Called with results of large icon retrieval request.
  59   void OnLargeIconDataAvailable(
  60       const content::URLDataSource::GotDataCallback& callback,
  61       const GURL& url,
  62       int size,
  63       const favicon_base::LargeIconResult& bitmap_result);
  64
  65   // Returns null to trigger "Not Found" response.
  66   void SendNotFoundResponse(
  67       const content::URLDataSource::GotDataCallback& callback);
  68
  69   base::CancelableTaskTracker cancelable_task_tracker_;
  70
  71   // Owned by client.
  72   favicon::FallbackIconService* fallback_icon_service_;
  73
  74   // Owned by client.
  75   favicon::LargeIconService* large_icon_service_;
  76
  77   DISALLOW_COPY_AND_ASSIGN(LargeIconSource);
  78 };
  79
  80 #endif  // CHROME_BROWSER_UI_WEBUI_LARGE_ICON_SOURCE_H_