Source/WebCore/platform/win/WindowMessageBroadcaster.h

/*
 * Copyright (C) 2007 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef WindowMessageBroadcaster_h
#define WindowMessageBroadcaster_h

#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/Noncopyable.h>

namespace WebCore {

    class WindowMessageListener;

    class WindowMessageBroadcaster {
        WTF_MAKE_NONCOPYABLE(WindowMessageBroadcaster);
    public:
        static void addListener(HWND, WindowMessageListener*);
        static void removeListener(HWND, WindowMessageListener*);

    private:
        typedef HashSet<WindowMessageListener*> ListenerSet;

        static LRESULT CALLBACK SubclassedWndProc(HWND, UINT, WPARAM, LPARAM);

        WindowMessageBroadcaster(HWND);
        ~WindowMessageBroadcaster();

        void addListener(WindowMessageListener*);
        void removeListener(WindowMessageListener*);
        const ListenerSet& listeners() const { return m_listeners; }

        void destroy();
        void unsubclassWindow();

        WNDPROC originalWndProc() const { return m_originalWndProc; }

        HWND m_subclassedWindow;
        WNDPROC m_originalWndProc;
        ListenerSet m_listeners;
    };

} // namespace WebCore

#endif // WindowMessageBroadcaster_h