ACL Library Message Dispatch Mechanism

ACLMessageDispatch.cpp

LRESULT ACLWinBase::DispatchMessage
(
	IN UINT		uMsg,
	IN WPARAM	wParam,
	IN LPARAM	lParam
)
{
	LRESULT	lResult(1);
	UINT	uSubMsg(WM_NULL);		//	By default this really isn't looked at.
	
	//	If we've received a W_COMMAND message or a
	//	W_NOTIFY message the dive into the sub-messages
	//	contained in these messages.
	//
    switch (uMsg)
	{
		case WM_COMMAND:
		{
			uSubMsg = LOWORD(wParam);
			break;
		}

		case WM_NOTIFY:
		{
			LPNMHDR pHDR = (LPNMHDR)lParam;
			if (pHDR)
			{
				//	This is the REAL message.
				//
				uSubMsg = pHDR->code;		
			}
			break;
		}

		case WM_SYSCOMMAND:
		{
			uSubMsg = (UINT)wParam;
			break;
		}

	}	//	Pre-message processing.

	bool			bail(false);
	PWINMSGHNDLR	pHandler 	= NULL;
	
	//	Check the Message map for the object, if the message passed
	//	in here matches one in the map then grab the name of the
	//	dispatch function and dispatch it!
	//
	for (ACLWinMessageMapCollection::iterator it = _msgMap.begin();
		 it != _msgMap.end() && false == bail;
		 ++it)
	{
		//	If the main command(wMsg) and the control ID(uSubMsg) 
		//	match then we've found a command handler for the 
		//	message.
		//
		if ((uMsg == (*it).uMsg) && 
			(uSubMsg == (*it).uSubMsg))
		{
			pHandler	= (*it).pMsgHandler;		
			bail		= true;
		}
	}

    //	If we found a matching message handler, then
	//	dispatch it otherwise return false.
	//
    if (pHandler)
	{
        lResult = (this->*pHandler)(wParam, lParam);
	}

	return lResult;
}	//	::DispatchMessage