extensions/browser/app_window/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 EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_GEOMETRY_CACHE_H_
   6 #define EXTENSIONS_BROWSER_APP_WINDOW_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/scoped_observer.h"
  16 #include "base/time/time.h"
  17 #include "base/timer/timer.h"
  18 #include "base/values.h"
  19 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
  20 #include "components/keyed_service/core/keyed_service.h"
  21 #include "extensions/browser/extension_registry_observer.h"
  22 #include "ui/base/ui_base_types.h"
  23 #include "ui/gfx/geometry/rect.h"
  24
  25 namespace extensions {
  26
  27 class ExtensionPrefs;
  28 class ExtensionRegistry;
  29
  30 // A cache for persisted geometry of app windows, both to not have to wait
  31 // for IO when creating a new window, and to not cause IO on every window
  32 // geometry change.
  33 class AppWindowGeometryCache : public KeyedService,
  34                                public ExtensionRegistryObserver {
  35  public:
  36   class Factory : public BrowserContextKeyedServiceFactory {
  37    public:
  38     static AppWindowGeometryCache* GetForContext(
  39         content::BrowserContext* context,
  40         bool create);
  41
  42     static Factory* GetInstance();
  43
  44    private:
  45     friend struct DefaultSingletonTraits<Factory>;
  46
  47     Factory();
  48     ~Factory() override;
  49
  50     // BrowserContextKeyedServiceFactory
  51     KeyedService* BuildServiceInstanceFor(
  52         content::BrowserContext* context) const override;
  53     bool ServiceIsNULLWhileTesting() const override;
  54     content::BrowserContext* GetBrowserContextToUse(
  55         content::BrowserContext* context) const override;
  56   };
  57
  58   class Observer {
  59    public:
  60     virtual void OnGeometryCacheChanged(const std::string& extension_id,
  61                                         const std::string& window_id,
  62                                         const gfx::Rect& bounds) = 0;
  63
  64    protected:
  65     virtual ~Observer() {}
  66   };
  67
  68   AppWindowGeometryCache(content::BrowserContext* context,
  69                          ExtensionPrefs* prefs);
  70
  71   ~AppWindowGeometryCache() override;
  72
  73   // Returns the instance for the given browsing context.
  74   static AppWindowGeometryCache* Get(content::BrowserContext* context);
  75
  76   // Save the geometry and state associated with |extension_id| and |window_id|.
  77   void SaveGeometry(const std::string& extension_id,
  78                     const std::string& window_id,
  79                     const gfx::Rect& bounds,
  80                     const gfx::Rect& screen_bounds,
  81                     ui::WindowShowState state);
  82
  83   // Get any saved geometry and state associated with |extension_id| and
  84   // |window_id|. If saved data exists, sets |bounds|, |screen_bounds| and
  85   // |state| if not NULL and returns true.
  86   bool GetGeometry(const std::string& extension_id,
  87                    const std::string& window_id,
  88                    gfx::Rect* bounds,
  89                    gfx::Rect* screen_bounds,
  90                    ui::WindowShowState* state);
  91
  92   // KeyedService
  93   void Shutdown() override;
  94
  95   void AddObserver(Observer* observer);
  96   void RemoveObserver(Observer* observer);
  97
  98   // Maximum number of windows we'll cache the geometry for per app.
  99   static const size_t kMaxCachedWindows = 100;
 100
 101  protected:
 102   friend class AppWindowGeometryCacheTest;
 103
 104   // For tests, this modifies the timeout delay for saving changes from calls
 105   // to SaveGeometry. (Note that even if this is set to 0, you still need to
 106   // run the message loop to see the results of any SyncToStorage call).
 107   void SetSyncDelayForTests(int timeout_ms);
 108
 109  private:
 110   // Data stored for each window.
 111   struct WindowData {
 112     WindowData();
 113     ~WindowData();
 114     gfx::Rect bounds;
 115     gfx::Rect screen_bounds;
 116     ui::WindowShowState window_state;
 117     base::Time last_change;
 118   };
 119
 120   // Data stored for each extension.
 121   typedef std::map<std::string, WindowData> ExtensionData;
 122
 123   // ExtensionRegistryObserver implementation.
 124   void OnExtensionLoaded(content::BrowserContext* browser_context,
 125                          const Extension* extension) override;
 126   void OnExtensionUnloaded(content::BrowserContext* browser_context,
 127                            const Extension* extension,
 128                            UnloadedExtensionInfo::Reason reason) override;
 129
 130   void LoadGeometryFromStorage(const std::string& extension_id);
 131   void SyncToStorage();
 132
 133   // Preferences storage.
 134   ExtensionPrefs* prefs_;
 135
 136   // Cached data.
 137   std::map<std::string, ExtensionData> cache_;
 138
 139   // Data that still needs saving.
 140   std::set<std::string> unsynced_extensions_;
 141
 142   // The timer used to save the data.
 143   base::OneShotTimer<AppWindowGeometryCache> sync_timer_;
 144
 145   // The timeout value we'll use for |sync_timer_|.
 146   base::TimeDelta sync_delay_;
 147
 148   // Listen to extension load, unloaded notifications.
 149   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
 150       extension_registry_observer_;
 151
 152   ObserverList<Observer> observers_;
 153 };
 154
 155 }  // namespace extensions
 156
 157 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_GEOMETRY_CACHE_H_