ZoomedViewer.java

package edu.cmu.minorthird.util.gui;

import java.util.List;

import org.apache.log4j.Logger;

/**
 * When an object is selected in the zoomedOut view, it's displayed in
 * the zoomedIn view.  Used for getting a close up view of, say,
 * objects in a list.
 * 
 * @author William Cohen
 */

public class ZoomedViewer extends SplitViewer{

	static final long serialVersionUID=20080517L;
	
	static private Logger log=Logger.getLogger(ZoomedViewer.class);

	static final boolean DEBUG=log.isDebugEnabled();

	// rename viewer1,viewer2
	private Viewer zoomedOut,zoomedIn;

	public ZoomedViewer(){
		super();
	}

	public ZoomedViewer(Viewer zoomedOut,Viewer zoomedIn){
		super(zoomedOut,zoomedIn);
		this.zoomedOut=viewer1;
		this.zoomedIn=viewer2;
	}

	@Override
	public void setSubViews(Viewer zoomedOut,Viewer zoomedIn){
		super.setSubViews(zoomedOut,zoomedIn);
		this.zoomedOut=viewer1;
		this.zoomedIn=viewer2;
	}

	@Override
	public void receiveContent(Object content){
		log.info("recieving content: "+content);
		zoomedOut.setContent(content);
		zoomedIn.clearContent();
	}

	/** Get the object being displayed as the user sees it.  */
	@Override
	public Object getVisibleContent(){
		return zoomedOut.getVisibleContent();
	}

	@Override
	public boolean canReceive(Object content){
		return zoomedOut!=null&&zoomedOut.canReceive(content);
	}

	@Override
	protected void handle(int signal,Object argument,List<Viewer> senders){
		zoomedIn.setContent(argument);
		revalidate();
	}

	@Override
	protected boolean canHandle(int signal,Object argument,List<Viewer> senders){
		if(DEBUG&&signal==OBJECT_SELECTED){
			log.debug("selection in zoomed viewer, content="+argument);
			log.debug("zoomedIn="+zoomedIn);
			log.debug("zoomedIn.canReceive is "+
					(zoomedIn!=null&&zoomedIn.canReceive(argument)));
		}
		if(signal==OBJECT_SELECTED&&senders.contains(zoomedOut)&&
				zoomedIn.canReceive(argument)){
			return true;
		}else{
			return false;
		}
	}

}