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      1 // Copyright 2013 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_APP_LIST_START_PAGE_HANDLER_H_
      6 #define CHROME_BROWSER_UI_WEBUI_APP_LIST_START_PAGE_HANDLER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/prefs/pref_change_registrar.h"
     11 #include "base/scoped_observer.h"
     12 #include "chrome/browser/ui/app_list/recommended_apps_observer.h"
     13 #include "content/public/browser/web_ui_message_handler.h"
     14 #include "extensions/browser/extension_registry_observer.h"
     15 
     16 namespace base {
     17 class ListValue;
     18 }
     19 
     20 namespace extensions {
     21 class ExtensionRegistry;
     22 }
     23 
     24 namespace app_list {
     25 
     26 class RecommendedApps;
     27 
     28 // Handler for the app launcher start page.
     29 class StartPageHandler : public content::WebUIMessageHandler,
     30                          public extensions::ExtensionRegistryObserver,
     31                          public RecommendedAppsObserver {
     32  public:
     33   StartPageHandler();
     34   virtual ~StartPageHandler();
     35 
     36  private:
     37   // content::WebUIMessageHandler overrides:
     38   virtual void RegisterMessages() OVERRIDE;
     39 
     40   // extensions::ExtensionRegistryObserver implementation.
     41   virtual void OnExtensionLoaded(
     42       content::BrowserContext* browser_context,
     43       const extensions::Extension* extension) OVERRIDE;
     44   virtual void OnExtensionUnloaded(
     45       content::BrowserContext* browser_context,
     46       const extensions::Extension* extension,
     47       extensions::UnloadedExtensionInfo::Reason reason) OVERRIDE;
     48 
     49   // RecommendedAppsObserver overrdies:
     50   virtual void OnRecommendedAppsChanged() OVERRIDE;
     51 
     52   // Creates a ListValue for the recommended apps and sends it to js side.
     53   void SendRecommendedApps();
     54 
     55 #if defined(OS_CHROMEOS)
     56   // Called when the pref has been changed.
     57   void OnHotwordEnabledChanged();
     58 #endif
     59 
     60   // JS callbacks.
     61   void HandleInitialize(const base::ListValue* args);
     62   void HandleLaunchApp(const base::ListValue* args);
     63   void HandleSpeechResult(const base::ListValue* args);
     64   void HandleSpeechSoundLevel(const base::ListValue* args);
     65   void HandleSpeechRecognition(const base::ListValue* args);
     66 
     67   RecommendedApps* recommended_apps_;  // Not owned.
     68   PrefChangeRegistrar pref_change_registrar_;
     69 
     70   ScopedObserver<extensions::ExtensionRegistry,
     71                  extensions::ExtensionRegistryObserver>
     72       extension_registry_observer_;
     73 
     74   DISALLOW_COPY_AND_ASSIGN(StartPageHandler);
     75 };
     76 
     77 }  // namespace app_list
     78 
     79 #endif  // CHROME_BROWSER_UI_WEBUI_APP_LIST_START_PAGE_HANDLER_H_
     80