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// Copyright (c) 2009 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 APP_ACTIVE_WINDOW_WATCHER_X_H_
#define APP_ACTIVE_WINDOW_WATCHER_X_H_
#pragma once
#include <gdk/gdk.h>
#include "base/basictypes.h"
#include "base/observer_list.h"
#include "base/singleton.h"
// 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 listener for changes to
// the active window.
class ActiveWindowWatcherX {
public:
class Observer {
public:
// |active_window| will be NULL if the active window isn't one of Chrome's.
virtual void ActiveWindowChanged(GdkWindow* active_window) = 0;
protected:
virtual ~Observer() {}
};
static void AddObserver(Observer* observer);
static void RemoveObserver(Observer* observer);
private:
friend struct DefaultSingletonTraits<ActiveWindowWatcherX>;
ActiveWindowWatcherX();
void Init();
// Sends a notification out through the NotificationService that the active
// window has changed.
void NotifyActiveWindowChanged();
// Callback for PropertyChange XEvents.
static GdkFilterReturn OnWindowXEvent(GdkXEvent* xevent,
GdkEvent* event,
gpointer window_watcher);
ObserverList<Observer> observers_;
DISALLOW_COPY_AND_ASSIGN(ActiveWindowWatcherX);
};
#endif // APP_ACTIVE_WINDOW_WATCHER_X_H_
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