shapesdiagram.java

mywork是rcp开发的很好的例子

/*******************************************************************************
 * Copyright (c) 2004, 2005 Elias Volanakis and others.
�* All rights reserved. This program and the accompanying materials
�* are made available under the terms of the Eclipse Public License v1.0
�* which accompanies this distribution, and is available at
�* http://www.eclipse.org/legal/epl-v10.html
�*
�* Contributors:
�*����Elias Volanakis - initial API and implementation
�*******************************************************************************/
package net.sf.freenote.model;

import java.util.ArrayList;
import java.util.List;

import net.sf.freenote.FreeNoteConstants;

/**
 * A container for multiple shapes.
 * This is the "root" of the model data structure.
 * @author Elias Volanakis
 */
public class ShapesDiagram extends ModelElement implements ShapesContainer {
private List children ;

/** 
 * Add a shape to this diagram.
 * @param s a non-null shape instance
 * @return true, if the shape was added, false otherwise
 */
public boolean addChild(Shape s) {
	if (s != null && getChildren().add(s)) {
		firePropertyChange(FreeNoteConstants.CHILD_ADDED_PROP, null, s);
		return true;
	}
	return false;
}

/** Return a List of Shapes in this diagram.  The returned List should not be modified. */
public List getChildren() {
	return children == null ? children =new ArrayList():children;
}

/**
 * Remove a shape from this diagram.
 * @param s a non-null shape instance;
 * @return true, if the shape was removed, false otherwise
 */
public boolean removeChild(Shape s) {
	if (s != null && getChildren().remove(s)) {
		firePropertyChange(FreeNoteConstants.CHILD_REMOVED_PROP, null, s);
		return true;
	}
	return false;
}

public void setChildren(List children) {
	this.children = children;
}
}