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<  * @(#)SendToBackCommand.java 5.2
---
>  * @(#)SendToBackCommand.java
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>  * Project:		JHotdraw - a GUI framework for technical drawings
>  *				http://www.jhotdraw.org
>  *				http://jhotdraw.sourceforge.net
>  * Copyright:	© by the original author(s) and all contributors
>  * License:		Lesser GNU Public License (LGPL)
>  *				http://www.opensource.org/licenses/lgpl-license.html
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< import java.util.*;
< import CH.ifa.draw.util.*;
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> import CH.ifa.draw.util.UndoableAdapter;
> import CH.ifa.draw.util.Undoable;
> import java.util.*;
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>  *
>  * @version <$CURRENT_VERSION$>
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< public class SendToBackCommand extends Command {
< 
<     private DrawingView fView;
---
> public class SendToBackCommand extends AbstractCommand {
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<         super(name);
<         fView = view;
---
>         super(name, view);
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<        FigureEnumeration k = new ReverseFigureEnumerator(fView.selectionZOrdered());
<        while (k.hasMoreElements()) {
<             fView.drawing().sendToBack(k.nextFigure());
---
>     	setUndoActivity(createUndoActivity());
>     	getUndoActivity().setAffectedFigures(new ReverseFigureEnumerator(view().selectionZOrdered()));
> 		FigureEnumeration fe = getUndoActivity().getAffectedFigures();
>         while (fe.hasMoreElements()) {
>             view().drawing().sendToBack(fe.nextFigure());
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<         fView.checkDamage();
---
>         view().checkDamage();
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<         return fView.selectionCount() > 0;
---
>         return view().selectionCount() > 0;
>     }
> 
> 	protected Undoable createUndoActivity() {
> 		return new SendToBackCommand.UndoActivity(view());
> 	}
> 
> 	public static class UndoActivity extends UndoableAdapter {
> 		private Hashtable myOriginalLayers;
> 		
> 		public UndoActivity(DrawingView newDrawingView) {
> 			super(newDrawingView);
> 			myOriginalLayers = new Hashtable();
> 			setUndoable(true);
> 			setRedoable(true);
> 		}
> 		
> 		public boolean undo() {
> 			if (!super.undo()) {
> 	        	return false;
> 			}
> 
> 			FigureEnumeration fe = getAffectedFigures();
> 			while (fe.hasMoreElements()) {
> 				Figure currentFigure = fe.nextFigure();
> 				int currentFigureLayer = getOriginalLayer(currentFigure);
> System.out.println("CurrentFigure sendToBack: " + currentFigure + " .. " + currentFigureLayer);
> 				getDrawingView().drawing().sendToLayer(currentFigure, currentFigureLayer);
> 			}
> 			
> 		    return true;
> 		}
> 		
> 		public boolean redo() {
> 			// do not call execute directly as the selection might has changed
> 			if (!isRedoable()) {
> 				return false;
> 			}
> 			
> 			FigureEnumeration fe = getAffectedFigures();
> 			while (fe.hasMoreElements()) {
> 				sendToCommand(fe.nextFigure());
> 			}
> 			
> 			return true;			
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> 		protected void sendToCommand(Figure f) {
> 			getDrawingView().drawing().sendToBack(f);
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> 		protected void addOriginalLayer(Figure affectedFigure, int newOriginalLayer) {
> 			myOriginalLayers.put(affectedFigure, new Integer(newOriginalLayer));
> 		}
> 		
> 		protected int getOriginalLayer(Figure lookupAffectedFigure) {
> 			return ((Integer)myOriginalLayers.get(lookupAffectedFigure)).intValue();
> 		}
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> 		public void setAffectedFigures(FigureEnumeration fe) {
> 			// first make copy of FigureEnumeration in superclass
> 			super.setAffectedFigures(fe);
> 			// then get new FigureEnumeration of copy to save attributes
> 	        FigureEnumeration copyFe = getAffectedFigures();
> 	        while (copyFe.hasMoreElements()) {
> 	            Figure f = copyFe.nextFigure();
> 	            int originalLayer = getDrawingView().drawing().getLayer(f);
>             	addOriginalLayer(f, originalLayer);
> 	        }
> 		}
> 	}
> }