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/*
* Copyright (C) 2007, 2014 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.
*/
#include "config.h"
#include "WindowMessageBroadcaster.h"
#include "WindowMessageListener.h"
namespace WebCore {
typedef HashMap<HWND, WindowMessageBroadcaster*> InstanceMap;
static InstanceMap& instancesMap()
{
static InstanceMap instances;
return instances;
}
void WindowMessageBroadcaster::addListener(HWND hwnd, WindowMessageListener* listener)
{
WindowMessageBroadcaster* broadcaster = instancesMap().get(hwnd);
if (!broadcaster) {
broadcaster = new WindowMessageBroadcaster(hwnd);
instancesMap().add(hwnd, broadcaster);
}
broadcaster->addListener(listener);
}
void WindowMessageBroadcaster::removeListener(HWND hwnd, WindowMessageListener* listener)
{
WindowMessageBroadcaster* broadcaster = instancesMap().get(hwnd);
if (!broadcaster)
return;
broadcaster->removeListener(listener);
}
WindowMessageBroadcaster::WindowMessageBroadcaster(HWND hwnd)
: m_subclassedWindow(hwnd)
, m_originalWndProc(0)
{
ASSERT_ARG(hwnd, IsWindow(hwnd));
}
WindowMessageBroadcaster::~WindowMessageBroadcaster()
{
}
void WindowMessageBroadcaster::addListener(WindowMessageListener* listener)
{
if (m_listeners.isEmpty()) {
ASSERT(!m_originalWndProc);
#pragma warning(disable: 4244 4312)
m_originalWndProc = reinterpret_cast<WNDPROC>(SetWindowLongPtr(m_subclassedWindow, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(SubclassedWndProc)));
}
ASSERT(m_originalWndProc);
m_listeners.add(listener);
}
void WindowMessageBroadcaster::removeListener(WindowMessageListener* listener)
{
m_listeners.remove(listener);
if (m_listeners.isEmpty())
destroy();
}
void WindowMessageBroadcaster::destroy()
{
m_listeners.clear();
unsubclassWindow();
instancesMap().remove(m_subclassedWindow);
delete this;
}
void WindowMessageBroadcaster::unsubclassWindow()
{
SetWindowLongPtr(m_subclassedWindow, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(m_originalWndProc));
m_originalWndProc = 0;
}
LRESULT CALLBACK WindowMessageBroadcaster::SubclassedWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
WindowMessageBroadcaster* broadcaster = instancesMap().get(hwnd);
ASSERT(broadcaster);
if (!broadcaster)
return 0;
ListenerSet::const_iterator end = broadcaster->listeners().end();
for (ListenerSet::const_iterator it = broadcaster->listeners().begin(); it != end; ++it)
(*it)->windowReceivedMessage(hwnd, message, wParam, lParam);
WNDPROC originalWndProc = broadcaster->originalWndProc();
// This will delete broadcaster.
if (message == WM_DESTROY)
broadcaster->destroy();
return CallWindowProc(originalWndProc, hwnd, message, wParam, lParam);
}
} // namespace WebCore
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