examples/org.eclipse.ui.examples.views.properties.tabbed.logic/src/org/eclipse/ui/examples/views/properties/tabbed/logic/properties/AbstractSection.java

/*******************************************************************************
 * Copyright (c) 2006 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.examples.views.properties.tabbed.logic.properties;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import org.eclipse.gef.EditPart;
import org.eclipse.gef.examples.logicdesigner.model.LogicElement;
import org.eclipse.jface.util.Assert;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.views.properties.tabbed.AbstractPropertySection;

/**
 * Abstract class for a section in a tab in the properties view.
 * 
 * @author Anthony Hunter 
 */
public abstract class AbstractSection
	extends AbstractPropertySection implements PropertyChangeListener {

	private LogicElement element;

	/**
	 * @see org.eclipse.ui.views.properties.tabbed.ITabbedPropertySection#setInput(org.eclipse.ui.IWorkbenchPart, org.eclipse.jface.viewers.ISelection)
	 */
	public void setInput(IWorkbenchPart part, ISelection selection) {
		super.setInput(part, selection);
		Assert.isTrue(selection instanceof IStructuredSelection);
		Object input = ((IStructuredSelection)selection).getFirstElement();
		Assert.isTrue(input instanceof EditPart);
		Object model = ((EditPart) input).getModel();
		Assert.isTrue(model instanceof LogicElement);
		this.element = (LogicElement) model;
	}

	/**
	 * @see org.eclipse.ui.views.properties.tabbed.view.ITabbedPropertySection#aboutToBeShown()
	 */
	public void aboutToBeShown() {
		getElement().addPropertyChangeListener(this);
	}

	/**
	 * @see org.eclipse.ui.views.properties.tabbed.view.ITabbedPropertySection#aboutToBeHidden()
	 */
	public void aboutToBeHidden() {
		getElement().removePropertyChangeListener(this);
	}

	/**
	 * Get the element.
	 * @return the element.
	 */
	public LogicElement getElement() {
		return element;
	}

	/**
	 * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
	 */
	public void propertyChange(PropertyChangeEvent evt) {
		refresh();
	}
}