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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 UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_
#define UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_
#include "base/basictypes.h"
#include "base/observer_list.h"
#include "ui/base/ui_export.h"
#include "ui/base/x/x11_util.h"
template <typename T> struct DefaultSingletonTraits;
namespace ui {
class ActiveWindowWatcherXObserver;
namespace internal {
class RootWindowPropertyWatcherX;
}
// This is a helper class that is used to keep track of which window the X
// window manager thinks is active. Add an Observer to listen for changes to
// the active window.
class UI_EXPORT ActiveWindowWatcherX {
public:
static ActiveWindowWatcherX* GetInstance();
static void AddObserver(ActiveWindowWatcherXObserver* observer);
static void RemoveObserver(ActiveWindowWatcherXObserver* observer);
// Checks if the WM supports the active window property. Note that the return
// value can change, especially during system startup.
static bool WMSupportsActivation();
private:
friend struct DefaultSingletonTraits<ActiveWindowWatcherX>;
friend class ui::internal::RootWindowPropertyWatcherX;
ActiveWindowWatcherX();
~ActiveWindowWatcherX();
// Gets the atom for the default display for the property this class is
// watching for.
static Atom GetPropertyAtom();
// Notify observers that the active window has changed.
static void Notify();
// Instance method that implements Notify().
void NotifyActiveWindowChanged();
ObserverList<ActiveWindowWatcherXObserver> observers_;
DISALLOW_COPY_AND_ASSIGN(ActiveWindowWatcherX);
};
} // namespace ui
#endif // UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_
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