Use "= default" to denote default constructor or destructor
[WebKit-https.git] / Source / WebCore / platform / win / WindowMessageBroadcaster.cpp
1 /*
2  * Copyright (C) 2007, 2014 Apple Inc. All rights reserved.
3  *
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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
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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 #include "config.h"
30 #include "WindowMessageBroadcaster.h"
31
32 #include "WindowMessageListener.h"
33
34 namespace WebCore {
35
36 typedef HashMap<HWND, WindowMessageBroadcaster*> InstanceMap;
37
38 static InstanceMap& instancesMap()
39 {
40     static InstanceMap instances;
41     return instances;
42 }
43
44 void WindowMessageBroadcaster::addListener(HWND hwnd, WindowMessageListener* listener)
45 {
46     WindowMessageBroadcaster* broadcaster = instancesMap().get(hwnd);
47     if (!broadcaster) {
48         broadcaster = new WindowMessageBroadcaster(hwnd);
49         instancesMap().add(hwnd, broadcaster);
50     }
51
52     broadcaster->addListener(listener);
53 }
54
55 void WindowMessageBroadcaster::removeListener(HWND hwnd, WindowMessageListener* listener)
56 {
57     WindowMessageBroadcaster* broadcaster = instancesMap().get(hwnd);
58     if (!broadcaster)
59         return;
60
61     broadcaster->removeListener(listener);
62 }
63
64 WindowMessageBroadcaster::WindowMessageBroadcaster(HWND hwnd)
65     : m_subclassedWindow(hwnd)
66     , m_originalWndProc(0)
67 {
68     ASSERT_ARG(hwnd, IsWindow(hwnd));
69 }
70
71 WindowMessageBroadcaster::~WindowMessageBroadcaster() = default;
72
73 void WindowMessageBroadcaster::addListener(WindowMessageListener* listener)
74 {
75     if (m_listeners.isEmpty()) {
76         ASSERT(!m_originalWndProc);
77 #pragma warning(disable: 4244 4312)
78         m_originalWndProc = reinterpret_cast<WNDPROC>(SetWindowLongPtr(m_subclassedWindow, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(SubclassedWndProc)));
79     }
80     ASSERT(m_originalWndProc);
81
82     m_listeners.add(listener);
83 }
84
85 void WindowMessageBroadcaster::removeListener(WindowMessageListener* listener)
86 {
87     m_listeners.remove(listener);
88     if (m_listeners.isEmpty())
89         destroy();
90 }
91
92 void WindowMessageBroadcaster::destroy()
93 {
94     m_listeners.clear();
95     unsubclassWindow();
96     instancesMap().remove(m_subclassedWindow);
97     delete this;
98 }
99
100 void WindowMessageBroadcaster::unsubclassWindow()
101 {
102     SetWindowLongPtr(m_subclassedWindow, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(m_originalWndProc));
103     m_originalWndProc = 0;
104 }
105
106 LRESULT CALLBACK WindowMessageBroadcaster::SubclassedWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
107 {
108     WindowMessageBroadcaster* broadcaster = instancesMap().get(hwnd);
109     ASSERT(broadcaster);
110     if (!broadcaster)
111         return 0;
112
113     ListenerSet::const_iterator end = broadcaster->listeners().end();
114     for (ListenerSet::const_iterator it = broadcaster->listeners().begin(); it != end; ++it)
115         (*it)->windowReceivedMessage(hwnd, message, wParam, lParam);
116
117     WNDPROC originalWndProc = broadcaster->originalWndProc();
118
119     // This will delete broadcaster.
120     if (message == WM_DESTROY)
121         broadcaster->destroy();
122
123     return CallWindowProc(originalWndProc, hwnd, message, wParam, lParam);
124 }
125
126 } // namespace WebCore