/*
 * @(#)SelectAllCommand.java
 *
 * 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
 */

package CH.ifa.draw.standard;

import CH.ifa.draw.framework.*;
import CH.ifa.draw.util.UndoableAdapter;
import CH.ifa.draw.util.Undoable;

/**
 * Command to select all figures in a view.
 *
 * @version <$CURRENT_VERSION$>
 */ 
public class SelectAllCommand extends AbstractCommand {
 
	/**
	 * Constructs a select all command.
	 * @param name the command name
	 * @param newDrawingEditor the DrawingEditor which manages the views
	 */
	public SelectAllCommand(String name, DrawingEditor newDrawingEditor) {
		super(name, newDrawingEditor);
	}
	
	public void execute() {
		super.execute();
		setUndoActivity(createUndoActivity());
    	getUndoActivity().setAffectedFigures(view().selectionElements());
		view().addToSelectionAll(view().drawing().figures());
		view().checkDamage();
	}
	
	/**
	 * Used in enabling the properties menu item.
	 * SelectAll menu item will be enabled only when there ia atleast one figure
	 * in the selected drawing view.
	 */
	public boolean isExecutableWithView() {
		FigureEnumeration e = view().drawing().figures();
	
		if(e.hasMoreElements() && e.nextFigure() != null) {
			return true;
		}
	
		return false;
	}

	/**
	 * Factory method for undo activity
	 */
	protected Undoable createUndoActivity() {
		return new SelectAllCommand.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();
			getDrawingView().addToSelectionAll(getAffectedFigures());
			
		    return true;
		}
		
		public boolean redo() {
			// do not call execute directly as the selection might has changed
			if (isRedoable()) {
				getDrawingView().addToSelectionAll(getDrawingView().drawing().figures());
				return true;
			}
			
			return false;
		}
	}
}