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// Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_GEOMETRY_CACHE_H_
#define CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_GEOMETRY_CACHE_H_
#include <map>
#include <set>
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time.h"
#include "base/timer.h"
#include "base/values.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "ui/gfx/rect.h"
class Profile;
namespace extensions {
class ExtensionPrefs;
// A cache for persisted geometry of shell 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 ShellWindowGeometryCache
: public base::SupportsWeakPtr<ShellWindowGeometryCache>,
public content::NotificationObserver {
public:
ShellWindowGeometryCache(Profile* profile,
ExtensionPrefs* prefs);
virtual ~ShellWindowGeometryCache();
void SaveGeometry(const std::string& extension_id,
const std::string& window_id,
const gfx::Rect& bounds);
bool GetGeometry(const std::string& extension_id,
const std::string& window_id,
gfx::Rect* bounds) const;
// Maximum number of windows we'll cache the geometry for per app.
static const size_t kMaxCachedWindows = 100;
protected:
friend class ShellWindowGeometryCacheTest;
// 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 {
gfx::Rect bounds;
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 OnExtensionLoaded(const std::string& extension_id);
void OnExtensionUnloaded(const std::string& extension_id);
void SyncToStorage();
// Preferences storage.
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<ShellWindowGeometryCache> sync_timer_;
// The timeout value we'll use for |sync_timer_|.
base::TimeDelta sync_delay_;
content::NotificationRegistrar registrar_;
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_SHELL_WINDOW_GEOMETRY_CACHE_H_
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