/****************************************************************** * Copyright (C) 2002-2006 Andrew Girow. All rights reserved.     * * ---------------------------------------------------------------* * This software is published under the terms of the TinyLine     * * License, a copy of which has been included with this           * * distribution in the TINYLINE_LICENSE.TXT file.                 * *                                                                * * For more information on the TinyLine,                          * * please see <http://www.tinyline.com/>.                         * *****************************************************************/package com.tinyline.app;import com.tinyline.svg.*;import com.tinyline.tiny2d.*;import org.w3c.dom.events.Event;import org.w3c.dom.events.EventTarget;/** * The <tt>SVGEventQueue</tt> is a class that queues SVG events. * * <p> * @author Andrew Girow * @version 1.9 * <p> */public class SVGEventQueue{    private SVGEvent queue;    /**     * Creates a new SVGEventQueue object.     */    public SVGEventQueue()    {        queue = null;    }    /**     * Resets the SVGEventQueue.     */    public synchronized void reset()    {        queue = null;    }    /**     * Remove an event from the queue and return it.  This method will     * block until an event has been posted by another thread.     * @return the next SVGEvent     * @exception InterruptedException     *            if another thread has interrupted this thread.     */    public synchronized SVGEvent getNextEvent() throws InterruptedException    {        while (queue == null)        {            wait();        }        SVGEvent event = queue;        queue = queue.next;        return event;    }    /**     * Dispatch an event to the eventHandler.     *     * @param theEvent an instance of SVGEvent, or a     * subclass of it.     */    public void handleEvent(SVGEvent theEvent)    {        if(theEvent!=null)        {           EventTarget target = theEvent.getCurrentTarget();           if(target!= null)              target.dispatchEvent(theEvent);        }    }    /**     * Post an event to the EventQueue.     *     * @param theEvent an instance of SVGEvent, or a     * subclass of it.     */    public synchronized void postEvent(SVGEvent theEvent)    {//System.out.println("postEvent! 0");        // empty queue        if (queue == null)        {           queue = theEvent;        }        // add to the end        else        {           SVGEvent q = queue;           for (;;)           {              if (q.id == theEvent.id)              {                  if(q.id == SVGEvent.EVENT_UPDATE)                  {                      ((TinyRect)q.data).union((TinyRect)theEvent.data);                      return;                  }              }              if (q.next != null)              {                  q = q.next;              }              else              {                  break;              }           } //for(;;)           q.next = theEvent;        } //else        notifyAll();//System.out.println("postEvent! 1");    }    /**     * Return the first event without removing it.     */    public synchronized SVGEvent peekEvent()    {        return queue;    }}