//
// EventDispatcher.h
//
// $Id: //poco/Main/XML/include/DOM/EventDispatcher.h#5 $
//
// Definition of the EventDispatcher class.
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// 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. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE
// COPYRIGHT OWNER OR 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
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// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef DOM_EventDispatcher_INCLUDED
#define DOM_EventDispatcher_INCLUDED


#ifndef XML_XML_INCLUDED
#include "XML/XML.h"
#endif
#ifndef XML_XMLString_INCLUDED
#include "XML/XMLString.h"
#endif
#ifndef STD_LIST_INCLUDED
#include <list>
#define STD_LIST_INCLUDED
#endif


XML_BEGIN


class Event;
class EventListener;


class XML_API EventDispatcher
	/// This helper class manages event listener subscriptions
	/// and event dispatching for AbstractNode.
	///
	/// The EventListener list is managed in such a way that
	/// event listeners can be added and removed even
	/// from within an EventListener, while events are being
	/// dispatched.
{
public:
	EventDispatcher();
		/// Creates the EventDispatcher.
		
	~EventDispatcher();
		/// Destroys the EventDispatcher.
		
	void addEventListener(const XMLString& type, EventListener* listener, bool useCapture);
		/// Adds an EventListener to the internal list.
		
	void removeEventListener(const XMLString& type, EventListener* listener, bool useCapture);
		/// Removes an EventListener from the internal list.
		///
		/// If a dispatch is currently in progress, the list
		/// entry is only marked for deletion.
		/// If no dispatch is currently in progress, all EventListeners
		/// marked for deletion are removed from the list.

	void dispatchEvent(Event* evt);
		/// Dispatches the event.
		///
		/// Also removes all EventListeners marked for deletion from the 
		/// event dispatcher list.
		
	void captureEvent(Event* evt);
		/// Dispatches the event in its capturing phase.
		///
		/// Also removes all EventListeners marked for deletion from the 
		/// event dispatcher list.
		
	void bubbleEvent(Event* evt);
		/// Dispatches the event in its bubbling phase.
		///
		/// Also removes all EventListeners marked for deletion from the 
		/// event dispatcher list.

private:
	struct EventListenerItem
	{
		XMLString      type;
		EventListener* pListener;
		bool           useCapture;
	};

	typedef std::list<EventListenerItem> EventListenerList;
	
	int               _inDispatch;
	EventListenerList _listeners;
};


XML_END


#endif // DOM_EventDispatcher_INCLUDED