/*
* @(#)SendToBackCommand.java
*
* Project: JHotdraw - a GUI framework for technical drawings
* http://www.jhotdraw.org
* http://jhotdraw.sourceforge.net
* Copyright: (c) by the original author(s) and all contributors
* License: Lesser GNU Public License (LGPL)
* http://www.opensource.org/licenses/lgpl-license.html
*/
package org.jhotdraw.standard;
import org.jhotdraw.framework.*;
import org.jhotdraw.util.UndoableAdapter;
import org.jhotdraw.util.Undoable;
import java.util.*;
/**
* A command to send the selection to the back of the drawing.
*
* @version <$CURRENT_VERSION$>
*/
public class SendToBackCommand extends AbstractCommand {
/**
* Constructs a send to back command.
* @param name the command name
* @param newDrawingEditor the DrawingEditor which manages the views
*/
public SendToBackCommand(String name, DrawingEditor newDrawingEditor) {
super(name, newDrawingEditor);
}
public void execute() {
super.execute();
setUndoActivity(createUndoActivity());
getUndoActivity().setAffectedFigures(view().selectionZOrdered());
FigureEnumeration fe = getUndoActivity().getAffectedFigures();
while (fe.hasNextFigure()) {
view().drawing().sendToBack(fe.nextFigure());
}
view().checkDamage();
}
protected boolean isExecutableWithView() {
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.hasNextFigure()) {
Figure currentFigure = fe.nextFigure();
int currentFigureLayer = getOriginalLayer(currentFigure);
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.hasNextFigure()) {
sendToCommand(fe.nextFigure());
}
return true;
}
protected void sendToCommand(Figure f) {
getDrawingView().drawing().sendToBack(f);
}
protected void addOriginalLayer(Figure affectedFigure, int newOriginalLayer) {
myOriginalLayers.put(affectedFigure, new Integer(newOriginalLayer));
}
protected int getOriginalLayer(Figure lookupAffectedFigure) {
return ((Integer)myOriginalLayers.get(lookupAffectedFigure)).intValue();
}
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.hasNextFigure()) {
Figure f = copyFe.nextFigure();
int originalLayer = getDrawingView().drawing().getLayer(f);
addOriginalLayer(f, originalLayer);
}
}
}
}