1/*
2 * Copyright (C) 2007 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef WindowMessageBroadcaster_h
30#define WindowMessageBroadcaster_h
31
32#include <wtf/HashMap.h>
33#include <wtf/HashSet.h>
34#include <wtf/Noncopyable.h>
35
36namespace WebCore {
37
38    class WindowMessageListener;
39
40    class WindowMessageBroadcaster {
41        WTF_MAKE_NONCOPYABLE(WindowMessageBroadcaster);
42    public:
43        static void addListener(HWND, WindowMessageListener*);
44        static void removeListener(HWND, WindowMessageListener*);
45
46    private:
47        typedef HashSet<WindowMessageListener*> ListenerSet;
48
49        static LRESULT CALLBACK SubclassedWndProc(HWND, UINT, WPARAM, LPARAM);
50
51        WindowMessageBroadcaster(HWND);
52        ~WindowMessageBroadcaster();
53
54        void addListener(WindowMessageListener*);
55        void removeListener(WindowMessageListener*);
56        const ListenerSet& listeners() const { return m_listeners; }
57
58        void destroy();
59        void unsubclassWindow();
60
61        WNDPROC originalWndProc() const { return m_originalWndProc; }
62
63        HWND m_subclassedWindow;
64        WNDPROC m_originalWndProc;
65        ListenerSet m_listeners;
66    };
67
68} // namespace WebCore
69
70#endif // WindowMessageBroadcaster_h
71