apps/app_window_geometry_cache.h

   1 // Copyright 2014 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_WINDOW_GEOMETRY_CACHE_H_
   6 #define APPS_APP_WINDOW_GEOMETRY_CACHE_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/singleton.h"
  14 #include "base/observer_list.h"
  15 #include "base/time/time.h"
  16 #include "base/timer/timer.h"
  17 #include "base/values.h"
  18 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
  19 #include "components/keyed_service/core/keyed_service.h"
  20 #include "content/public/browser/notification_observer.h"
  21 #include "content/public/browser/notification_registrar.h"
  22 #include "ui/base/ui_base_types.h"
  23 #include "ui/gfx/rect.h"
  24
  25 class Profile;
  26
  27 namespace extensions {
  28 class ExtensionPrefs;
  29 }
  30
  31 namespace apps {
  32
  33 // A cache for persisted geometry of app windows, both to not have to wait
  34 // for IO when creating a new window, and to not cause IO on every window
  35 // geometry change.
  36 class AppWindowGeometryCache : public KeyedService,
  37                                public content::NotificationObserver {
  38  public:
  39   class Factory : public BrowserContextKeyedServiceFactory {
  40    public:
  41     static AppWindowGeometryCache* GetForContext(
  42         content::BrowserContext* context,
  43         bool create);
  44
  45     static Factory* GetInstance();
  46
  47    private:
  48     friend struct DefaultSingletonTraits<Factory>;
  49
  50     Factory();
  51     virtual ~Factory();
  52
  53     // BrowserContextKeyedServiceFactory
  54     virtual KeyedService* BuildServiceInstanceFor(
  55         content::BrowserContext* context) const OVERRIDE;
  56     virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
  57     virtual content::BrowserContext* GetBrowserContextToUse(
  58         content::BrowserContext* context) const OVERRIDE;
  59   };
  60
  61   class Observer {
  62    public:
  63     virtual void OnGeometryCacheChanged(const std::string& extension_id,
  64                                         const std::string& window_id,
  65                                         const gfx::Rect& bounds) = 0;
  66
  67    protected:
  68     virtual ~Observer() {}
  69   };
  70
  71   AppWindowGeometryCache(Profile* profile, extensions::ExtensionPrefs* prefs);
  72
  73   virtual ~AppWindowGeometryCache();
  74
  75   // Returns the instance for the given browsing context.
  76   static AppWindowGeometryCache* Get(content::BrowserContext* context);
  77
  78   // Save the geometry and state associated with |extension_id| and |window_id|.
  79   void SaveGeometry(const std::string& extension_id,
  80                     const std::string& window_id,
  81                     const gfx::Rect& bounds,
  82                     const gfx::Rect& screen_bounds,
  83                     ui::WindowShowState state);
  84
  85   // Get any saved geometry and state associated with |extension_id| and
  86   // |window_id|. If saved data exists, sets |bounds|, |screen_bounds| and
  87   // |state| if not NULL and returns true.
  88   bool GetGeometry(const std::string& extension_id,
  89                    const std::string& window_id,
  90                    gfx::Rect* bounds,
  91                    gfx::Rect* screen_bounds,
  92                    ui::WindowShowState* state);
  93
  94   // KeyedService
  95   virtual void Shutdown() OVERRIDE;
  96
  97   void AddObserver(Observer* observer);
  98   void RemoveObserver(Observer* observer);
  99
 100   // Maximum number of windows we'll cache the geometry for per app.
 101   static const size_t kMaxCachedWindows = 100;
 102
 103  protected:
 104   friend class AppWindowGeometryCacheTest;
 105
 106   // For tests, this modifies the timeout delay for saving changes from calls
 107   // to SaveGeometry. (Note that even if this is set to 0, you still need to
 108   // run the message loop to see the results of any SyncToStorage call).
 109   void SetSyncDelayForTests(int timeout_ms);
 110
 111  private:
 112   // Data stored for each window.
 113   struct WindowData {
 114     WindowData();
 115     ~WindowData();
 116     gfx::Rect bounds;
 117     gfx::Rect screen_bounds;
 118     ui::WindowShowState window_state;
 119     base::Time last_change;
 120   };
 121
 122   // Data stored for each extension.
 123   typedef std::map<std::string, WindowData> ExtensionData;
 124
 125   // content::NotificationObserver
 126   virtual void Observe(int type,
 127                        const content::NotificationSource& source,
 128                        const content::NotificationDetails& details) OVERRIDE;
 129
 130   void LoadGeometryFromStorage(const std::string& extension_id);
 131   void OnExtensionUnloaded(const std::string& extension_id);
 132   void SyncToStorage();
 133
 134   // Preferences storage.
 135   extensions::ExtensionPrefs* prefs_;
 136
 137   // Cached data
 138   std::map<std::string, ExtensionData> cache_;
 139
 140   // Data that still needs saving
 141   std::set<std::string> unsynced_extensions_;
 142
 143   // The timer used to save the data
 144   base::OneShotTimer<AppWindowGeometryCache> sync_timer_;
 145
 146   // The timeout value we'll use for |sync_timer_|.
 147   base::TimeDelta sync_delay_;
 148
 149   content::NotificationRegistrar registrar_;
 150   ObserverList<Observer> observers_;
 151 };
 152
 153 }  // namespace apps
 154
 155 #endif  // APPS_APP_WINDOW_GEOMETRY_CACHE_H_