www.pudn.com > pueblo.zip > ChHook.cpp

/*---------------------------------------------------------------------------- 
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    /_/    \_\_| |_|\__,_|_|  \___/|_| |_| |_|\___|\__,_|_|\__,_| 
 
    The contents of this file are subject to the Andromedia Public 
	License Version 1.0 (the "License"); you may not use this file 
	except in compliance with the License. You may obtain a copy of 
	the License at http://www.andromedia.com/APL/ 
 
    Software distributed under the License is distributed on an 
	"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 
	implied. See the License for the specific language governing 
	rights and limitations under the License. 
 
    The Original Code is Pueblo client code, released November 4, 1998. 
 
    The Initial Developer of the Original Code is Andromedia Incorporated. 
	Portions created by Andromedia are Copyright (C) 1998 Andromedia 
	Incorporated.  All Rights Reserved. 
 
	Andromedia Incorporated                         415.365.6700 
	818 Mission Street - 2nd Floor                  415.365.6701 fax 
	San Francisco, CA 94103 
 
    Contributor(s): 
	-------------------------------------------------------------------------- 
	   Chaco team:  Dan Greening, Glenn Crocker, Jim Doubek, 
	                Coyote Lussier, Pritham Shetty. 
 
					Wrote and designed original codebase. 
 
------------------------------------------------------------------------------ 
 
	This file consists of the interface for the ChHookManager class, which 
	provides functional support for a module to manager hooked messages. 
 
----------------------------------------------------------------------------*/ 
 
// $Header: /home/cvs/chaco/api/ChHook.cpp,v 2.2 1996/03/07 21:16:41 pritham Exp $ 
 
#include "headers.h" 
#include  
 
#include  
 
 
/*---------------------------------------------------------------------------- 
	ChHookManager public methods 
----------------------------------------------------------------------------*/ 
 
void ChHookManager::Install( const ChModuleID& idModule ) 
{ 
											/* Only add each module ID to the 
												hook list once */ 
	if (0 == m_moduleList.Find( idModule )) 
	{										/* This module ID isn't in the hook 
												list, so we'll add it */ 
		m_moduleList.AddTail( idModule ); 
	} 
} 
 
chparam ChHookManager::Dispatch( ChMsg& msg, bool& boolProcessed ) const 
{ 
	chparam		returnVal; 
 
	if (m_moduleList.IsEmpty()) 
	{ 
		boolProcessed = false; 
 
		returnVal = 0; 
	} 
	else 
	{ 
		ChPosition		posCurr = m_moduleList.GetHeadPosition(); 
 
		do { 
			ChModuleID	idModule = m_moduleList.GetNext( posCurr ); 
 
			msg.SetDestinationModule( idModule ); 
			returnVal = m_pCore->DispatchMsg( idModule, msg ); 
 
		} while (posCurr && !msg.IsProcessed()); 
 
		if (!(boolProcessed = msg.IsProcessed())) 
		{ 
			returnVal = 0; 
		} 
	} 
 
	return returnVal; 
} 
 
void ChHookManager::Promote( const ChModuleID& idModule, bool boolPromote ) 
{ 
	ChPosition		pos; 
 
	ASSERT( !m_moduleList.IsEmpty() ); 
											// Find the element to be promoted 
	pos = m_moduleList.Find( idModule ); 
											// The element must be in the list 
	ASSERT( 0 != pos ); 
											/* Remove the module ID and 
												reinsert it at the head or 
												tail of the list */ 
	m_moduleList.Remove( pos ); 
 
	if (boolPromote) 
	{ 
		m_moduleList.AddHead( idModule ); 
	} 
	else 
	{ 
		m_moduleList.AddTail( idModule ); 
	} 
} 
 
void ChHookManager::Uninstall( const ChModuleID& idModule ) 
{ 
	ChPosition		pos; 
 
	ASSERT( !m_moduleList.IsEmpty() ); 
											// Find the element to be promoted 
	pos = m_moduleList.Find( idModule ); 
											// The element must be in the list 
	ASSERT( 0 != pos ); 
											// Remove the module ID 
	m_moduleList.Remove( pos ); 
}