package org.eclipse.jface.tests.viewers.interactive;

/*
 * Licensed Materials - Property of IBM,
 * WebSphere Studio Workbench
 * (c) Copyright IBM Corp 1999, 2000
 */
import org.eclipse.jface.*;
import org.eclipse.jface.action.*;
import org.eclipse.jface.tests.viewers.*;
import org.eclipse.jface.viewers.*;
import java.util.*;

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());
	}
}