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> import CH.ifa.draw.util.CommandListener;
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< public abstract class AbstractCommand implements Command, FigureSelectionListener {
---
> public abstract class AbstractCommand implements Command, FigureSelectionListener, ViewChangeListener {
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> 	private boolean myIsViewRequired;
> 	private AbstractCommand.EventDispatcher myEventDispatcher;
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< 	 * the DrawingView this command applies to
---
> 	 * the DrawingEditor this command applies to
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> 	private DrawingEditor myDrawingEditor;
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< 	private DrawingView fView;
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> 	 * @param newDrawingEditor the DrawingEditor which manages the views
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> 		this(newName, newDrawingEditor, true);
> 	}
> 
> 	public AbstractCommand(String newName, DrawingEditor newDrawingEditor, boolean newIsViewRequired) {
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< 	public AbstractCommand(String newName, DrawingView newView) {
---
> 	public AbstractCommand(String newName, DrawingEditor newDrawingEditor) {
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> 		setDrawingEditor(newDrawingEditor);
> 		getDrawingEditor().addViewChangeListener(this);
> 		myIsViewRequired = newIsViewRequired;
> 		setEventDispatcher(createEventDispatcher());
> 	}
> 
> 	public void viewSelectionChanged(DrawingView oldView, DrawingView newView) {
> 		if (oldView != null) {
> 			oldView.removeFigureSelectionListener(this);
> 		}
> 		if (newView != null) {
> 			newView.addFigureSelectionListener(this);
> 		}
> 		checkExecutable();
> 	}
> 
> 	/**
> 	 * Sent when a new view is created
> 	 */
> 	public void viewCreated(DrawingView view) {
> 	}
> 
> 	/**
> 	 * Send when an existing view is about to be destroyed.
> 	 */
> 	public void viewDestroying(DrawingView view) {
> 	}
> 
> 	protected void checkExecutable() {
> 		if (isExecutable()) {
> 			getEventDispatcher().fireCommandExecutableEvent();
> 		}
> 		else {
> 			getEventDispatcher().fireCommandNotExecutableEvent();
> 		}
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< 		setView(newView);
< 		view().addFigureSelectionListener(this);
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< 	 * @return view associated with this command
---
> 	 * @return DrawingEditor associated with this command
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> 	private void setDrawingEditor(DrawingEditor newDrawingEditor) {
> 		myDrawingEditor = newDrawingEditor;
> 	}
> 
> 	/**
> 	 * Convenience method
> 	 *
> 	 * @return DrawingView currently active in the editor
> 	 */
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> 	public DrawingEditor getDrawingEditor() {
> 		return myDrawingEditor;
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> 		return getDrawingEditor().view();
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< 	public DrawingView view() {
---
> 	public DrawingView view() {
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< 		return fView;
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< 	private void setView(DrawingView newView) {
< 		fView = newView;
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> 	public void execute() {
> 		if (view() == null) {
> 			throw new JHotDrawRuntimeException("execute should NOT be getting called when view() == null");
> 		};
> 	}
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<     public abstract void execute();
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<      * Tests if the command can be executed.
---
> 	 * Tests if the command can be executed. The view must be valid when this is
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> 	 * called. Per default, a command is executable if at
> 	 * least one figure is selected in the current activated
> 	 * view.
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> 		if (view() == null) {
> 			return false;
> 		}
> 		else if (isExecutableWithView()) {
> 			return view().isInteractive();
> 		}
> 		else {
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> 	}
> 
> 	protected boolean isExecutableWithView() {
> 		return myIsViewRequired;
> 	}
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> 
> 	public void addCommandListener(CommandListener newCommandListener) {
> 		getEventDispatcher().addCommandListener(newCommandListener);
> 	}
> 	
> 	public void removeCommandListener(CommandListener oldCommandListener) {
> 		getEventDispatcher().removeCommandListener(oldCommandListener);
> 	}
> 
> 	private void setEventDispatcher(AbstractCommand.EventDispatcher newEventDispatcher) {
> 		myEventDispatcher = newEventDispatcher;
> 	}
> 
> 	protected AbstractCommand.EventDispatcher getEventDispatcher() {
> 		return myEventDispatcher;
> 	}
> 
> 	public AbstractCommand.EventDispatcher createEventDispatcher() {
> 		return new AbstractCommand.EventDispatcher(this);
> 	}
> 
> 	public static class EventDispatcher {
> 		private Vector myRegisteredListeners;
> 		private Command myObservedCommand;
> 		
> 		public EventDispatcher(Command newObservedCommand) {
> 			myRegisteredListeners = new Vector();
> 			myObservedCommand = newObservedCommand;
> 		}
> 		
> 		public void fireCommandExecutedEvent() {
> 			Enumeration le = myRegisteredListeners.elements();
> 			while (le.hasMoreElements()) {
> 				((CommandListener)le.nextElement()).commandExecuted(new EventObject(myObservedCommand));
> 			}
> 		}
> 		
> 		public void fireCommandExecutableEvent() {
> 			Enumeration le = myRegisteredListeners.elements();
> 			while (le.hasMoreElements()) {
> 				((CommandListener)le.nextElement()).commandExecutable(new EventObject(myObservedCommand));
> 			}
> 		}
> 
> 		public void fireCommandNotExecutableEvent() {
> 			Enumeration le = myRegisteredListeners.elements();
> 			while (le.hasMoreElements()) {
> 				((CommandListener)le.nextElement()).commandNotExecutable(new EventObject(myObservedCommand));
> 			}
> 		}
> 
> 		public void addCommandListener(CommandListener newCommandListener) {
> 			if (!myRegisteredListeners.contains(newCommandListener)) {
> 				myRegisteredListeners.add(newCommandListener);
> 			}
> 		}
> 		
> 		public void removeCommandListener(CommandListener oldCommandListener) {
> 			if (myRegisteredListeners.contains(oldCommandListener)) {
> 				myRegisteredListeners.remove(oldCommandListener);
> 			}
> 		}
> 	}