AbstractWidgetRootEditPart.java

/*******************************************************************************
 * Copyright (c) 2008 Olivier Moises
 *
 * 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:
 *   Olivier Moises- initial API and implementation
 *******************************************************************************/

package org.eclipse.wazaabi.engine.core.viewers;

import org.eclipse.wazaabi.engine.core.editparts.AbstractWidgetEditPart;
import org.eclipse.wazaabi.engine.core.editparts.ContainerEditPart;
import org.eclipse.wazaabi.engine.core.editparts.WidgetEditPart;
import org.eclipse.wazaabi.engine.core.gef.EditPart;
import org.eclipse.wazaabi.engine.core.gef.EditPartViewer;
import org.eclipse.wazaabi.engine.core.gef.RootEditPart;

public abstract class AbstractWidgetRootEditPart extends ContainerEditPart
		implements RootEditPart {

	private WidgetEditPart contents = null;
	private EditPartViewer viewer = null;

	public EditPart getContents() {
		return contents;
	}

	/**
	 * Returns <code>this</code>.
	 * 
	 * @see org.eclipse.wazaabi.engine.core.gef.EditPart#getRoot()
	 */
	public RootEditPart getRoot() {
		return this;
	}

	public EditPartViewer getViewer() {
		return viewer;
	}

	protected void refreshChildren() {
	}

	public void renewVisuals() {
		super.renewVisuals();
	}

	public void setContents(EditPart editpart) {
		assert editpart instanceof WidgetEditPart || editpart == null;
		if (contents == editpart)
			return;
		if (contents != null)
			removeChild(contents);

		contents = (WidgetEditPart) editpart;

		if (contents != null) {
			addChild(contents, -1);
			((AbstractWidgetEditPart) contents).processPostUIBuilding();
		}
		getWidgetView().validate();
	}

	/**
	 * @see RootEditPart#setViewer(EditPartViewer)
	 */
	public void setViewer(EditPartViewer newViewer) {
		assert newViewer == null || newViewer instanceof EditPartViewer;
		if (viewer == newViewer)
			return;
		if (viewer != null)
			unregister();
		viewer = newViewer;
		if (viewer != null)
			register();
	}

	protected void hookModel() {
		// there is no model associated to the RootEditPart
	}

	protected void unhookModel() {
		// there is no model associated to the RootEditPart
	}

	@Override
	protected void refreshVisuals() {
	}

	@Override
	public void refresh() {
		if (getContents() != null)
			getContents().refresh();
	}

}