/*******************************************************************************
 * Copyright (c) 2000, 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.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());
    }
}