/*******************************************************************************
* 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 org.asem.eclipse.mii.model.parts;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import org.asem.eclipse.mii.model.abs.AbstractModelElement;
import org.asem.eclipse.mii.model.abs.ShapeConstants;
import org.asem.eclipse.mii.model.shapes.ShapesDiagram;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.RootEditPart;
import org.eclipse.gef.editparts.AbstractTreeEditPart;
import org.eclipse.gef.editpolicies.RootComponentEditPolicy;
/**
* TreeEditPart for a ShapesDiagram instance. This is used in the Outline View
* of the ShapesEditor.
* <p>
* This edit part must implement the PropertyChangeListener interface, so it can
* be notified of property changes in the corresponding model element.
* </p>
*
* @author Elias Volanakis
*/
@SuppressWarnings("rawtypes")
class DiagramTreeEditPart extends AbstractTreeEditPart implements
PropertyChangeListener {
/**
* Create a new instance of this edit part using the given model element.
*
* @param model
* a non-null ShapesDiagram instance
*/
DiagramTreeEditPart(ShapesDiagram model) {
super(model);
}
/**
* Upon activation, attach to the model element as a property change
* listener.
*/
public void activate() {
if (!isActive()) {
super.activate();
((AbstractModelElement) getModel()).addPropertyChangeListener(this);
}
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.gef.examples.shapes.parts.ShapeTreeEditPart#createEditPolicies
* ()
*/
protected void createEditPolicies() {
// If this editpart is the root content of the viewer, then disallow
// removal
if (getParent() instanceof RootEditPart) {
installEditPolicy(EditPolicy.COMPONENT_ROLE,
new RootComponentEditPolicy());
}
}
/**
* Upon deactivation, detach from the model element as a property change
* listener.
*/
public void deactivate() {
if (isActive()) {
super.deactivate();
((AbstractModelElement) getModel()).removePropertyChangeListener(this);
}
}
private ShapesDiagram getCastedModel() {
return (ShapesDiagram) getModel();
}
/**
* Convenience method that returns the EditPart corresponding to a given
* child.
*
* @param child
* a model element instance
* @return the corresponding EditPart or null
*/
private EditPart getEditPartForChild(Object child) {
return (EditPart) getViewer().getEditPartRegistry().get(child);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editparts.AbstractEditPart#getModelChildren()
*/
protected List getModelChildren() {
return getCastedModel().getChildren(); // a list of shapes
}
/*
* (non-Javadoc)
*
* @see java.beans.PropertyChangeListener#propertyChange(java.beans.
* PropertyChangeEvent)
*/
public void propertyChange(PropertyChangeEvent evt) {
String prop = evt.getPropertyName();
if (ShapeConstants.CHILD_ADDED_PROP.equals(prop)) {
// add a child to this edit part
// causes an additional entry to appear in the tree of the outline
// view
addChild(createChild(evt.getNewValue()), -1);
} else if (ShapeConstants.CHILD_REMOVED_PROP.equals(prop)) {
// remove a child from this edit part
// causes the corresponding edit part to disappear from the tree in
// the outline view
removeChild(getEditPartForChild(evt.getNewValue()));
} else {
refreshVisuals();
}
}
}