apps/app_lifetime_monitor.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 APPS_APP_LIFETIME_MONITOR_H_
   6 #define APPS_APP_LIFETIME_MONITOR_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/observer_list.h"
  12 #include "components/keyed_service/core/keyed_service.h"
  13 #include "content/public/browser/notification_observer.h"
  14 #include "content/public/browser/notification_registrar.h"
  15 #include "extensions/browser/app_window/app_window_registry.h"
  16
  17 namespace extensions {
  18 class Extension;
  19 }
  20
  21 class Profile;
  22
  23 namespace apps {
  24
  25 // Observes startup of apps and their windows and notifies observers of these
  26 // events.
  27 class AppLifetimeMonitor : public KeyedService,
  28                            public content::NotificationObserver,
  29                            public extensions::AppWindowRegistry::Observer {
  30  public:
  31   class Observer {
  32    public:
  33     // Called when the app starts running.
  34     virtual void OnAppStart(Profile* profile, const std::string& app_id) {}
  35     // Called when the app becomes active to the user, i.e. it opens a window.
  36     virtual void OnAppActivated(Profile* profile, const std::string& app_id) {}
  37     // Called when the app becomes inactive to the user.
  38     virtual void OnAppDeactivated(Profile* profile, const std::string& app_id) {
  39     }
  40     // Called when the app stops running.
  41     virtual void OnAppStop(Profile* profile, const std::string& app_id) {}
  42     // Called when chrome is about to terminate. This gives observers a chance
  43     // to do something before the apps shut down. This is a system-wide event
  44     // so there is no associated profile and app id.
  45     virtual void OnChromeTerminating() {}
  46
  47    protected:
  48     virtual ~Observer() {}
  49   };
  50
  51   explicit AppLifetimeMonitor(Profile* profile);
  52   virtual ~AppLifetimeMonitor();
  53
  54   void AddObserver(Observer* observer);
  55   void RemoveObserver(Observer* observer);
  56
  57  private:
  58   // content::NotificationObserver overrides:
  59   virtual void Observe(int type,
  60                        const content::NotificationSource& source,
  61                        const content::NotificationDetails& details) OVERRIDE;
  62
  63   // extensions::AppWindowRegistry::Observer overrides:
  64   virtual void OnAppWindowRemoved(extensions::AppWindow* app_window) OVERRIDE;
  65   virtual void OnAppWindowHidden(extensions::AppWindow* app_window) OVERRIDE;
  66   virtual void OnAppWindowShown(extensions::AppWindow* app_window) OVERRIDE;
  67
  68   // KeyedService overrides:
  69   virtual void Shutdown() OVERRIDE;
  70
  71   bool HasVisibleAppWindows(extensions::AppWindow* app_window) const;
  72
  73   void NotifyAppStart(const std::string& app_id);
  74   void NotifyAppActivated(const std::string& app_id);
  75   void NotifyAppDeactivated(const std::string& app_id);
  76   void NotifyAppStop(const std::string& app_id);
  77   void NotifyChromeTerminating();
  78
  79   content::NotificationRegistrar registrar_;
  80   Profile* profile_;
  81   ObserverList<Observer> observers_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(AppLifetimeMonitor);
  84 };
  85
  86 }  // namespace apps
  87
  88 #endif  // APPS_APP_LIFETIME_MONITOR_H_