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/*******************************************************************************
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* Copyright (c) 2005, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.gef.editparts;
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import org.eclipse.draw2d.Figure;
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import org.eclipse.draw2d.IFigure;
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import org.eclipse.draw2d.StackLayout;
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import org.eclipse.gef.EditPart;
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import org.eclipse.gef.EditPartViewer;
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import org.eclipse.gef.Request;
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import org.eclipse.gef.RootEditPart;
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import org.eclipse.gef.commands.Command;
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import org.eclipse.gef.commands.UnexecutableCommand;
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/**
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* Default implementation of RootEditPart for GraphicalViewers.
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*
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* @author Pratik Shah
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* @since 3.2
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*/
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public class SimpleRootEditPart extends AbstractGraphicalEditPart implements
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RootEditPart {
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private EditPart contents;
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private EditPartViewer viewer;
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/**
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* No editpolicies are installed on a RootEditPart by default.
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*
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* @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies()
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*/
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protected void createEditPolicies() {
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}
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/**
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* The default root figure is a figure with a stack layout.
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*
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* @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#createFigure()
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*/
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protected IFigure createFigure() {
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Figure figure = new Figure();
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figure.setLayoutManager(new StackLayout());
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return figure;
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}
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/**
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* The RootEditPart should never be asked for a command. This implementation
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* returns an unexecutable command.
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*
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* @see EditPart#getCommand(Request)
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*/
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public Command getCommand(Request req) {
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return UnexecutableCommand.INSTANCE;
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}
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/**
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* @see RootEditPart#getContents()
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*/
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public EditPart getContents() {
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return contents;
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}
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/**
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* @see EditPart#getRoot()
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*/
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public RootEditPart getRoot() {
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return this;
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}
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/**
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* @see EditPart#getViewer()
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*/
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public EditPartViewer getViewer() {
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return viewer;
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}
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/**
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* Overridden to do nothing, child is set using setContents(EditPart)
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*
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* @see AbstractEditPart#refreshChildren()
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*/
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protected void refreshChildren() {
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}
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/**
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* @see RootEditPart#setContents(EditPart)
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*/
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public void setContents(EditPart editpart) {
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if (contents == editpart)
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return;
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if (contents != null)
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removeChild(contents);
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contents = editpart;
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if (contents != null)
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addChild(contents, 0);
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}
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/**
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* @see RootEditPart#setViewer(EditPartViewer)
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*/
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public void setViewer(EditPartViewer newViewer) {
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if (viewer == newViewer)
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return;
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if (viewer != null)
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unregister();
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viewer = newViewer;
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if (viewer != null)
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register();
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}
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}
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