apps/shell_window_geometry_cache.h

   1 // Copyright (c) 2012 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_EXTENSIONS_SHELL_WINDOW_GEOMETRY_CACHE_H_
   6 #define CHROME_BROWSER_EXTENSIONS_SHELL_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/browser_context_keyed_service/browser_context_keyed_service.h"
  19 #include "components/browser_context_keyed_service/browser_context_keyed_service_factory.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 shell 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 ShellWindowGeometryCache
  37     : public BrowserContextKeyedService,
  38       public content::NotificationObserver {
  39  public:
  40   class Factory : public BrowserContextKeyedServiceFactory {
  41    public:
  42     static ShellWindowGeometryCache* GetForContext(
  43         content::BrowserContext* context,
  44         bool create);
  45
  46     static Factory* GetInstance();
  47    private:
  48     friend struct DefaultSingletonTraits<Factory>;
  49
  50     Factory();
  51     virtual ~Factory();
  52
  53     // BrowserContextKeyedServiceFactory
  54     virtual BrowserContextKeyedService* 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   ShellWindowGeometryCache(Profile* profile,
  72                            extensions::ExtensionPrefs* prefs);
  73
  74   virtual ~ShellWindowGeometryCache();
  75
  76   // Returns the instance for the given browsing context.
  77   static ShellWindowGeometryCache* Get(content::BrowserContext* context);
  78
  79   // Save the geometry and state associated with |extension_id| and |window_id|.
  80   void SaveGeometry(const std::string& extension_id,
  81                     const std::string& window_id,
  82                     const gfx::Rect& bounds,
  83                     const gfx::Rect& screen_bounds,
  84                     ui::WindowShowState state);
  85
  86   // Get any saved geometry and state associated with |extension_id| and
  87   // |window_id|. If saved data exists, sets |bounds|, |screen_bounds| and
  88   // |state| if not NULL and returns true.
  89   bool GetGeometry(const std::string& extension_id,
  90                    const std::string& window_id,
  91                    gfx::Rect* bounds,
  92                    gfx::Rect* screen_bounds,
  93                    ui::WindowShowState* state);
  94
  95   // BrowserContextKeyedService
  96   virtual void Shutdown() OVERRIDE;
  97
  98   void AddObserver(Observer* observer);
  99   void RemoveObserver(Observer* observer);
 100
 101   // Maximum number of windows we'll cache the geometry for per app.
 102   static const size_t kMaxCachedWindows = 100;
 103
 104  protected:
 105   friend class ShellWindowGeometryCacheTest;
 106
 107   // For tests, this modifies the timeout delay for saving changes from calls
 108   // to SaveGeometry. (Note that even if this is set to 0, you still need to
 109   // run the message loop to see the results of any SyncToStorage call).
 110   void SetSyncDelayForTests(int timeout_ms);
 111
 112  private:
 113   // Data stored for each window.
 114   struct WindowData {
 115     WindowData();
 116     ~WindowData();
 117     gfx::Rect bounds;
 118     gfx::Rect screen_bounds;
 119     ui::WindowShowState window_state;
 120     base::Time last_change;
 121   };
 122
 123   // Data stored for each extension.
 124   typedef std::map<std::string, WindowData> ExtensionData;
 125
 126   // content::NotificationObserver
 127   virtual void Observe(int type,
 128                        const content::NotificationSource& source,
 129                        const content::NotificationDetails& details) OVERRIDE;
 130
 131   void LoadGeometryFromStorage(const std::string& extension_id);
 132   void OnExtensionUnloaded(const std::string& extension_id);
 133   void SyncToStorage();
 134
 135   // Preferences storage.
 136   extensions::ExtensionPrefs* prefs_;
 137
 138   // Cached data
 139   std::map<std::string, ExtensionData> cache_;
 140
 141   // Data that still needs saving
 142   std::set<std::string> unsynced_extensions_;
 143
 144   // The timer used to save the data
 145   base::OneShotTimer<ShellWindowGeometryCache> sync_timer_;
 146
 147   // The timeout value we'll use for |sync_timer_|.
 148   base::TimeDelta sync_delay_;
 149
 150   content::NotificationRegistrar registrar_;
 151   ObserverList<Observer> observers_;
 152 };
 153
 154 }  // namespace apps
 155
 156 #endif  // CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_GEOMETRY_CACHE_H_