wg_message_server.cpp

一个小巧的嵌入式图形系统wGUI, 可以用VC编译

// wg_message_server.cpp
//
// CMessageServer class implementation
//
//
// Copyright (c) 2002 Rob Wiskow
// [e-mail]
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//


#include "wgui_include_config.h"
#include "wg_message_server.h"
#include "std_ex.h"
#include "wg_message_client.h"
#include "wg_error.h"
#include "wg_debug.h"


namespace wGui
{

CMessageServer* CMessageServer::m_pInstance = 0;


CMessageServer::CMessageServer(void)
{
	m_pSemaphore = SDL_CreateSemaphore(0);
}


CMessageServer::~CMessageServer(void)
{

}


CMessageServer& CMessageServer::Instance(void)
{
	if (!m_pInstance)
	{
		m_pInstance = new CMessageServer;
		if (!m_pInstance)
		{
			throw(Wg_Ex_App("CMessageServer::Instance : Unable to instantiate Message Server!"));
		}
	}

	return *m_pInstance;
}


void CMessageServer::RegisterMessageClient(CMessageClient* pClient, CMessage::EMessageType eMessageType, unsigned char Priority)
{
	m_MessageClients[eMessageType].insert(std::make_pair(Priority, std::make_pair(pClient, false)));
}


void CMessageServer::DeregisterMessageClient(CMessageClient* pClient, CMessage::EMessageType eMessageType)
{
	t_MessageClientPriorityMap& PriorityMap = m_MessageClients[eMessageType];
	t_MessageClientPriorityMap::iterator iter = PriorityMap.begin();
	while (iter != PriorityMap.end())
	{
		if (iter->second.first == pClient)
		{
			PriorityMap.erase(iter);
			iter = PriorityMap.begin();
		}
		else
		{
			++iter;
		}
	}
}


void CMessageServer::DeregisterMessageClient(CMessageClient* pClient)
{
	for (t_MessageClientMap::iterator iter = m_MessageClients.begin(); iter != m_MessageClients.end(); ++iter)
	{
		t_MessageClientPriorityMap::iterator iter2 = iter->second.begin();
		while (iter2 != iter->second.end())
		{
			if (iter2->second.first == pClient)
			{
				iter->second.erase(iter2);
				iter2 = iter->second.begin();
			}
			else
			{
				++iter2;
			}
		}
	}
}


void CMessageServer::DeliverMessage(void)
{
	if (m_MessageQueue.size() > 0)
	{
		CMessage* pMessage = m_MessageQueue.front();
		t_MessageClientPriorityMap& PriorityMap = m_MessageClients[pMessage->MessageType()];

		for (t_MessageClientPriorityMap::iterator iter = PriorityMap.begin(); iter != PriorityMap.end(); ++iter)
		{
			iter->second.second = true;
		}

		bool bFinished = false;
		while (! bFinished)
		{
			t_MessageClientPriorityMap::iterator iter = PriorityMap.begin();
			for (; iter != PriorityMap.end(); ++iter)
			{
				if (iter->second.second)
				{
				iter->second.second = false;
				bFinished = iter->second.first->HandleMessage(pMessage);
				break;
				}
			}
			if (iter == PriorityMap.end())
			{
				bFinished = true;
			}
		}

		m_MessageQueue.pop_front();
		delete pMessage;
	}
}


void CMessageServer::QueueMessage(CMessage* pMessage)
{
	m_MessageQueue.push_back(pMessage);
}

}