1 files changed, 155 insertions, 0 deletions
diff --git a/apps/app_window_geometry_cache.h b/apps/app_window_geometry_cache.h
new file mode 100644
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+++ b/apps/app_window_geometry_cache.h
@@ -0,0 +1,155 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef APPS_APP_WINDOW_GEOMETRY_CACHE_H_
+#define APPS_APP_WINDOW_GEOMETRY_CACHE_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/singleton.h"
+#include "base/observer_list.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "base/values.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "ui/base/ui_base_types.h"
+#include "ui/gfx/rect.h"
+
+class Profile;
+
+namespace extensions {
+class ExtensionPrefs;
+}
+
+namespace apps {
+
+// A cache for persisted geometry of app windows, both to not have to wait
+// for IO when creating a new window, and to not cause IO on every window
+// geometry change.
+class AppWindowGeometryCache : public BrowserContextKeyedService,
+                               public content::NotificationObserver {
+ public:
+  class Factory : public BrowserContextKeyedServiceFactory {
+   public:
+    static AppWindowGeometryCache* GetForContext(
+        content::BrowserContext* context,
+        bool create);
+
+    static Factory* GetInstance();
+
+   private:
+    friend struct DefaultSingletonTraits<Factory>;
+
+    Factory();
+    virtual ~Factory();
+
+    // BrowserContextKeyedServiceFactory
+    virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+        content::BrowserContext* context) const OVERRIDE;
+    virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
+    virtual content::BrowserContext* GetBrowserContextToUse(
+        content::BrowserContext* context) const OVERRIDE;
+  };
+
+  class Observer {
+   public:
+    virtual void OnGeometryCacheChanged(const std::string& extension_id,
+                                        const std::string& window_id,
+                                        const gfx::Rect& bounds) = 0;
+
+   protected:
+    virtual ~Observer() {};
+  };
+
+  AppWindowGeometryCache(Profile* profile, extensions::ExtensionPrefs* prefs);
+
+  virtual ~AppWindowGeometryCache();
+
+  // Returns the instance for the given browsing context.
+  static AppWindowGeometryCache* Get(content::BrowserContext* context);
+
+  // Save the geometry and state associated with |extension_id| and |window_id|.
+  void SaveGeometry(const std::string& extension_id,
+                    const std::string& window_id,
+                    const gfx::Rect& bounds,
+                    const gfx::Rect& screen_bounds,
+                    ui::WindowShowState state);
+
+  // Get any saved geometry and state associated with |extension_id| and
+  // |window_id|. If saved data exists, sets |bounds|, |screen_bounds| and
+  // |state| if not NULL and returns true.
+  bool GetGeometry(const std::string& extension_id,
+                   const std::string& window_id,
+                   gfx::Rect* bounds,
+                   gfx::Rect* screen_bounds,
+                   ui::WindowShowState* state);
+
+  // BrowserContextKeyedService
+  virtual void Shutdown() OVERRIDE;
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // Maximum number of windows we'll cache the geometry for per app.
+  static const size_t kMaxCachedWindows = 100;
+
+ protected:
+  friend class AppWindowGeometryCacheTest;
+
+  // For tests, this modifies the timeout delay for saving changes from calls
+  // to SaveGeometry. (Note that even if this is set to 0, you still need to
+  // run the message loop to see the results of any SyncToStorage call).
+  void SetSyncDelayForTests(int timeout_ms);
+
+ private:
+  // Data stored for each window.
+  struct WindowData {
+    WindowData();
+    ~WindowData();
+    gfx::Rect bounds;
+    gfx::Rect screen_bounds;
+    ui::WindowShowState window_state;
+    base::Time last_change;
+  };
+
+  // Data stored for each extension.
+  typedef std::map<std::string, WindowData> ExtensionData;
+
+  // content::NotificationObserver
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  void LoadGeometryFromStorage(const std::string& extension_id);
+  void OnExtensionUnloaded(const std::string& extension_id);
+  void SyncToStorage();
+
+  // Preferences storage.
+  extensions::ExtensionPrefs* prefs_;
+
+  // Cached data
+  std::map<std::string, ExtensionData> cache_;
+
+  // Data that still needs saving
+  std::set<std::string> unsynced_extensions_;
+
+  // The timer used to save the data
+  base::OneShotTimer<AppWindowGeometryCache> sync_timer_;
+
+  // The timeout value we'll use for |sync_timer_|.
+  base::TimeDelta sync_delay_;
+
+  content::NotificationRegistrar registrar_;
+  ObserverList<Observer> observers_;
+};
+
+}  // namespace apps
+
+#endif  // APPS_APP_WINDOW_GEOMETRY_CACHE_H_