chrome/browser/ui/webui/app_list/start_page_handler.h

   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_