/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.tests.viewers.interactive;

import org.eclipse.jface.tests.viewers.TestElement;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;

public abstract class TestSelectionAction extends TestBrowserAction implements ISelectionChangedListener {
	public TestSelectionAction(String label, TestBrowser browser) {
		super(label, browser);
		browser.getViewer().addSelectionChangedListener(this);
		setEnabled(false);
	}
	public TestElement getTestElement(ISelection selection) {
		if (selection instanceof IStructuredSelection) {
			return (TestElement) ((IStructuredSelection) selection).getFirstElement();
		}
		return null;
	}
/**
 * Overridden from Action.
 */
public void run() {
	TestElement testElement = getTestElement(getBrowser().getViewer().getSelection());
	if (testElement != null) {
		run(testElement);
	}
}
	/**
	 * The default implementation calls run(TestElement)
	 * on every element contained in the vector.
	 */
	public void run(TestElement o) {
	}
	public void selectionChanged(SelectionChangedEvent event) {
		setEnabled(!event.getSelection().isEmpty());
	}
}