/*
* @(#)UngroupCommand.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.figures;
import org.jhotdraw.framework.*;
import org.jhotdraw.standard.*;
import org.jhotdraw.util.UndoableAdapter;
import org.jhotdraw.util.Undoable;
/**
* Command to ungroup the selected figures.
*
* @see GroupCommand
*
* @version <$CURRENT_VERSION$>
*/
public class UngroupCommand extends AbstractCommand {
/**
* Constructs a group command.
* @param name the command name
* @param newDrawingEditor the DrawingEditor which manages the views
*/
public UngroupCommand(String name, DrawingEditor newDrawingEditor) {
super(name, newDrawingEditor);
}
public void execute() {
super.execute();
setUndoActivity(createUndoActivity());
// selection of group figures
getUndoActivity().setAffectedFigures(view().selection());
view().clearSelection();
((UngroupCommand.UndoActivity)getUndoActivity()).ungroupFigures();
view().checkDamage();
}
public boolean isExecutableWithView() {
FigureEnumeration fe = view().selection();
while (fe.hasNextFigure()) {
Figure currentFigure = fe.nextFigure();
currentFigure = currentFigure.getDecoratedFigure();
if (!(currentFigure instanceof GroupFigure)) {
return false;
}
}
return view().selectionCount() > 0;
}
/**
* Factory method for undo activity
*/
protected Undoable createUndoActivity() {
return new UngroupCommand.UndoActivity(view());
}
public static class UndoActivity extends UndoableAdapter {
public UndoActivity(DrawingView newDrawingView) {
super(newDrawingView);
setUndoable(true);
setRedoable(true);
}
public boolean undo() {
if (!super.undo()) {
return false;
}
getDrawingView().clearSelection();
FigureEnumeration groupFigures = getAffectedFigures();
while (groupFigures.hasNextFigure()) {
Figure groupFigure = groupFigures.nextFigure();
// orphan individual figures from the group
getDrawingView().drawing().orphanAll(groupFigure.figures());
Figure figure = getDrawingView().drawing().add(groupFigure);
getDrawingView().addToSelection(figure);
}
return true;
}
public boolean redo() {
// do not call execute directly as the selection might has changed
if (isRedoable()) {
getDrawingView().drawing().orphanAll(getAffectedFigures());
getDrawingView().clearSelection();
ungroupFigures();
return true;
}
return false;
}
protected void ungroupFigures() {
FigureEnumeration fe = getAffectedFigures();
while (fe.hasNextFigure()) {
Figure selected = fe.nextFigure();
Figure group = getDrawingView().drawing().orphan(selected);
getDrawingView().drawing().addAll(group.figures());
getDrawingView().addToSelectionAll(group.figures());
}
}
}
}