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      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 Computer, 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 #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()
     72 {
     73 }
     74 
     75 void WindowMessageBroadcaster::addListener(WindowMessageListener* listener)
     76 {
     77     if (m_listeners.isEmpty()) {
     78         ASSERT(!m_originalWndProc);
     79 #pragma warning(disable: 4244 4312)
     80         m_originalWndProc = reinterpret_cast<WNDPROC>(SetWindowLongPtr(m_subclassedWindow, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(SubclassedWndProc)));
     81     }
     82 
     83     m_listeners.add(listener);
     84 }
     85 
     86 void WindowMessageBroadcaster::removeListener(WindowMessageListener* listener)
     87 {
     88     ListenerSet::iterator found = m_listeners.find(listener);
     89     if (found == m_listeners.end())
     90         return;
     91 
     92     m_listeners.remove(found);
     93 
     94     if (m_listeners.isEmpty())
     95         destroy();
     96 }
     97 
     98 void WindowMessageBroadcaster::destroy()
     99 {
    100     m_listeners.clear();
    101     unsubclassWindow();
    102     instancesMap().remove(m_subclassedWindow);
    103     delete this;
    104 }
    105 
    106 void WindowMessageBroadcaster::unsubclassWindow()
    107 {
    108     SetWindowLongPtr(m_subclassedWindow, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(m_originalWndProc));
    109     m_originalWndProc = 0;
    110 }
    111 
    112 LRESULT CALLBACK WindowMessageBroadcaster::SubclassedWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    113 {
    114     WindowMessageBroadcaster* broadcaster = instancesMap().get(hwnd);
    115     ASSERT(broadcaster);
    116 
    117     ListenerSet::const_iterator end = broadcaster->listeners().end();
    118     for (ListenerSet::const_iterator it = broadcaster->listeners().begin(); it != end; ++it)
    119         (*it)->windowReceivedMessage(hwnd, message, wParam, lParam);
    120 
    121     WNDPROC originalWndProc = broadcaster->originalWndProc();
    122 
    123     // This will delete broadcaster.
    124     if (message == WM_DESTROY)
    125         broadcaster->destroy();
    126 
    127     return CallWindowProc(originalWndProc, hwnd, message, wParam, lParam);
    128 }
    129 
    130 } // namespace WebCore
    131