chrome/browser/ui/webui/ntp/favicon_webui_handler.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_UI_WEBUI_NTP_FAVICON_WEBUI_HANDLER_H_
   6 #define CHROME_BROWSER_UI_WEBUI_NTP_FAVICON_WEBUI_HANDLER_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "chrome/browser/favicon/favicon_service.h"
  14 #include "chrome/common/cancelable_task_tracker.h"
  15 #include "content/public/browser/web_ui_message_handler.h"
  16
  17 class ExtensionIconColorManager;
  18
  19 namespace base {
  20 class ListValue;
  21 }
  22
  23 class FaviconWebUIHandler : public content::WebUIMessageHandler {
  24  public:
  25   FaviconWebUIHandler();
  26   virtual ~FaviconWebUIHandler();
  27
  28   // WebUIMessageHandler
  29   virtual void RegisterMessages() OVERRIDE;
  30
  31   // Called from the JS to get the dominant color of a favicon. The first
  32   // argument is a favicon URL, the second is the ID of the DOM node that is
  33   // asking for it.
  34   void HandleGetFaviconDominantColor(const base::ListValue* args);
  35
  36   // As above, but for an app tile. The sole argument is the extension ID.
  37   void HandleGetAppIconDominantColor(const base::ListValue* args);
  38
  39   // Callback getting signal that an app icon is loaded.
  40   void NotifyAppIconReady(const std::string& extension_id);
  41
  42  private:
  43   // Called when favicon data is available from the history backend.
  44   void OnFaviconDataAvailable(
  45       FaviconService::Handle request_handle,
  46       const chrome::FaviconBitmapResult& bitmap_result);
  47
  48   CancelableTaskTracker cancelable_task_tracker_;
  49
  50   // Map from request ID to DOM ID so we can make the appropriate callback when
  51   // the favicon request comes back. This map exists because
  52   // CancelableRequestConsumerTSimple only takes POD keys.
  53   std::map<int, std::string> dom_id_map_;
  54   // A counter to track ID numbers as we use them.
  55   int id_;
  56
  57   // Raw PNG representation of the favicon to show when the favicon
  58   // database doesn't have a favicon for a webpage.
  59   scoped_refptr<base::RefCountedMemory> default_favicon_;
  60
  61   // Manage retrieval of icons from apps.
  62   scoped_ptr<ExtensionIconColorManager> app_icon_color_manager_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(FaviconWebUIHandler);
  65 };
  66
  67 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_FAVICON_WEBUI_HANDLER_H_