/*******************************************************************************
* 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.eclipse.gef.examples.shapes.parts;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import org.eclipse.draw2d.ConnectionLayer;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.FreeformLayer;
import org.eclipse.draw2d.FreeformLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.MarginBorder;
import org.eclipse.draw2d.ShortestPathConnectionRouter;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.LayerConstants;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.editparts.AbstractGraphicalEditPart;
import org.eclipse.gef.editpolicies.RootComponentEditPolicy;
import org.eclipse.gef.editpolicies.XYLayoutEditPolicy;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gef.requests.CreateRequest;
import org.eclipse.gef.examples.shapes.model.EllipticalShape;
import org.eclipse.gef.examples.shapes.model.ModelElement;
import org.eclipse.gef.examples.shapes.model.RectangularShape;
import org.eclipse.gef.examples.shapes.model.Shape;
import org.eclipse.gef.examples.shapes.model.ShapesDiagram;
import org.eclipse.gef.examples.shapes.model.commands.ShapeCreateCommand;
import org.eclipse.gef.examples.shapes.model.commands.ShapeSetConstraintCommand;
/**
* EditPart for the a ShapesDiagram instance.
* <p>This edit part server as the main diagram container, the white area where
* everything else is in. Also responsible for the container's layout (the
* way the container rearanges is contents) and the container's capabilities
* (edit policies).
* </p>
* <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
*/
class DiagramEditPart extends AbstractGraphicalEditPart
implements PropertyChangeListener {
/**
* Upon activation, attach to the model element as a property change listener.
*/
public void activate() {
if (!isActive()) {
super.activate();
((ModelElement) getModel()).addPropertyChangeListener(this);
}
}
/* (non-Javadoc)
* @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies()
*/
protected void createEditPolicies() {
// disallows the removal of this edit part from its parent
installEditPolicy(EditPolicy.COMPONENT_ROLE, new RootComponentEditPolicy());
// handles constraint changes (e.g. moving and/or resizing) of model elements
// and creation of new model elements
installEditPolicy(EditPolicy.LAYOUT_ROLE, new ShapesXYLayoutEditPolicy());
}
/* (non-Javadoc)
* @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#createFigure()
*/
protected IFigure createFigure() {
Figure f = new FreeformLayer();
f.setBorder(new MarginBorder(3));
f.setLayoutManager(new FreeformLayout());
// Create the static router for the connection layer
ConnectionLayer connLayer = (ConnectionLayer)getLayer(LayerConstants.CONNECTION_LAYER);
connLayer.setConnectionRouter(new ShortestPathConnectionRouter(f));
return f;
}
/**
* Upon deactivation, detach from the model element as a property change listener.
*/
public void deactivate() {
if (isActive()) {
super.deactivate();
((ModelElement) getModel()).removePropertyChangeListener(this);
}
}
private ShapesDiagram getCastedModel() {
return (ShapesDiagram) getModel();
}
/* (non-Javadoc)
* @see org.eclipse.gef.editparts.AbstractEditPart#getModelChildren()
*/
protected List getModelChildren() {
return getCastedModel().getChildren(); // return a list of shapes
}
/* (non-Javadoc)
* @see java.beans.PropertyChangeListener#propertyChange(PropertyChangeEvent)
*/
public void propertyChange(PropertyChangeEvent evt) {
String prop = evt.getPropertyName();
// these properties are fired when Shapes are added into or removed from
// the ShapeDiagram instance and must cause a call of refreshChildren()
// to update the diagram's contents.
if (ShapesDiagram.CHILD_ADDED_PROP.equals(prop)
|| ShapesDiagram.CHILD_REMOVED_PROP.equals(prop)) {
refreshChildren();
}
}
/**
* EditPolicy for the Figure used by this edit part.
* Children of XYLayoutEditPolicy can be used in Figures with XYLayout.
* @author Elias Volanakis
*/
private static class ShapesXYLayoutEditPolicy extends XYLayoutEditPolicy {
/* (non-Javadoc)
* @see ConstrainedLayoutEditPolicy#createChangeConstraintCommand(ChangeBoundsRequest, EditPart, Object)
*/
protected Command createChangeConstraintCommand(ChangeBoundsRequest request,
EditPart child, Object constraint) {
if (child instanceof ShapeEditPart && constraint instanceof Rectangle) {
// return a command that can move and/or resize a Shape
return new ShapeSetConstraintCommand(
(Shape) child.getModel(), request, (Rectangle) constraint);
}
return super.createChangeConstraintCommand(request, child, constraint);
}
/* (non-Javadoc)
* @see ConstrainedLayoutEditPolicy#createChangeConstraintCommand(EditPart, Object)
*/
protected Command createChangeConstraintCommand(EditPart child,
Object constraint) {
// not used in this example
return null;
}
/* (non-Javadoc)
* @see LayoutEditPolicy#getCreateCommand(CreateRequest)
*/
protected Command getCreateCommand(CreateRequest request) {
Object childClass = request.getNewObjectType();
if (childClass == EllipticalShape.class || childClass == RectangularShape.class) {
// return a command that can add a Shape to a ShapesDiagram
return new ShapeCreateCommand((Shape)request.getNewObject(),
(ShapesDiagram)getHost().getModel(), (Rectangle)getConstraintFor(request));
}
return null;
}
}
}