FocusOnSelectionAction.java

/*******************************************************************************
 * Copyright (c) 2000, 2007 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
 *
 
 *******************************************************************************/
package org.eclipse.vjet.eclipse.internal.ui.typehierarchy;

import org.eclipse.dltk.mod.core.IType;
import org.eclipse.dltk.mod.internal.corext.util.Messages;
import org.eclipse.dltk.mod.internal.ui.util.SelectionUtil;
import org.eclipse.dltk.mod.ui.ScriptElementLabels;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;

/**
 * Refocuses the type hierarchy on the currently selection type.
 */
public class FocusOnSelectionAction extends Action {

	private VJOTypeHierarchyViewPart fViewPart;

	public FocusOnSelectionAction(VJOTypeHierarchyViewPart part) {
		super(TypeHierarchyMessages.FocusOnSelectionAction_label);
		setDescription(TypeHierarchyMessages.FocusOnSelectionAction_description);
		setToolTipText(TypeHierarchyMessages.FocusOnSelectionAction_tooltip);
		fViewPart = part;

		// PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
		// IJavaHelpContextIds.FOCUS_ON_SELECTION_ACTION);
	}

	private ISelection getSelection() {
		ISelectionProvider provider = fViewPart.getSite()
				.getSelectionProvider();
		if (provider != null) {
			return provider.getSelection();
		}
		return null;
	}

	/*
	 * @see Action#run
	 */
	public void run() {
		Object element = SelectionUtil.getSingleElement(getSelection());
		if (element instanceof IType) {
			fViewPart.setInputElement((IType) element);
		}
	}

	public boolean canActionBeAdded() {
		Object element = SelectionUtil.getSingleElement(getSelection());
		if (element instanceof IType) {
			IType type = (IType) element;
			setText(Messages.format(
					TypeHierarchyMessages.FocusOnSelectionAction_label,
					ScriptElementLabels.getDefault().getTextLabel(type, 0)));
			return true;
		}
		return false;
	}
}