/*******************************************************************************
 * Copyright (c) 2008 Standards for Technology in Automotive Retail 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:
 *     David Carver - initial API and implementation, bug 212330
 *     
 *******************************************************************************/

package org.eclipse.wst.xml.ui.internal.handlers;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.handlers.HandlerUtil;

public class CollapseAllHandler extends ExpandCollapseAllHandler implements IHandler {

	/**
	 * 
	 */
	public CollapseAllHandler() {
		super();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
	 */
	public Object execute(ExecutionEvent event) throws ExecutionException {
		IEditorPart editorPart = HandlerUtil.getActiveEditor(event);
		
		viewer = getTableTreeViewerForEditorPart(editorPart);
		
		if (viewer != null) {
			// temporarily set the visibility to false
			// this has a HUGE performance benefit
			boolean isVisible = viewer.getControl().getVisible();
			viewer.getControl().setVisible(false);
			viewer.collapseAll();

			// restore the previous visibility state
			// 
			viewer.getControl().setVisible(isVisible);
		}		
		
		return null;
	}
}
