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<  * @(#)PolyLineHandle.java 5.2
---
>  * @(#)PolyLineHandle.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.awt.*;
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> import CH.ifa.draw.standard.SingleFigureEnumerator;
> import CH.ifa.draw.util.Undoable;
> import CH.ifa.draw.util.UndoableAdapter;
> import java.awt.*;
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>  *
>  * @version <$CURRENT_VERSION$>
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<     private Point fAnchor;
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>         setUndoActivity(createUndoActivity(fIndex));
>         getUndoActivity().setAffectedFigures(new SingleFigureEnumerator(owner()));
>         ((PolyLineHandle.UndoActivity)getUndoActivity()).setOldPoint(new Point(x,y));
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<         fAnchor = new Point(x, y);
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> 		int fIndex = ((PolyLineHandle.UndoActivity)getUndoActivity()).getPointIndex();
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> 	public void invokeEnd(int x, int y, int anchorX, int anchorY, DrawingView view) {
> 		if ((x == anchorX) && (y == anchorY)) {
>  			setUndoActivity(null);
> 		}
> 	}
> 	
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> 
> 	/**
> 	 * Factory method for undo activity. To be overriden by subclasses.
> 	 */
> 	protected Undoable createUndoActivity(int newPointIndex) {
> 		return new PolyLineHandle.UndoActivity(newPointIndex);
> 	}
> 	
> 	public static class UndoActivity extends UndoableAdapter {
> 		private Point myOldPoint;
> 		private int myPointIndex;
> 
> 		public UndoActivity(int newPointIndex) {
> 			super(null);
> 			setUndoable(true);
> 			setRedoable(true);
> 			setPointIndex(newPointIndex);
> 		}
> 		
> 		public boolean undo() {
> 			if (!super.undo()) {
> 				return false;
> 			}
> 
> 			return movePointToOldLocation();
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> 		public boolean redo() {
> 			// do not call execute directly as the selection might has changed
> 			if (!isRedoable()) {
> 				return false;
> 			}
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> 			return movePointToOldLocation();
> 		}
> 
> 		protected boolean movePointToOldLocation() {
> 			FigureEnumeration fe = getAffectedFigures();
> 			if (!fe.hasMoreElements()) {
> 				return false;
> 			}
> 
> 			PolyLineFigure figure = (PolyLineFigure)fe.nextFigure();
> 			Point backupPoint = figure.pointAt(getPointIndex());
> 			figure.setPointAt(getOldPoint(), getPointIndex());
> 			setOldPoint(backupPoint);
> 			return true;
> 		}
> 
> 		public void setOldPoint(Point newOldPoint) {
> 			myOldPoint = newOldPoint;
> 		}
> 		
> 		public Point getOldPoint() {
> 			return myOldPoint;
> 		}
> 
> 		public void setPointIndex(int newPointIndex) {
> 			myPointIndex = newPointIndex;
> 		}
> 		
> 		public int getPointIndex() {
> 			return myPointIndex;
> 		}
> 	}
> }