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/*******************************************************************************
* Copyright (c) 2003, 2005 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.debug.internal.ui.sourcelookup;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jface.viewers.IStructuredSelection;
/**
* The action used to move source containers up in the list
*/
public class UpAction extends SourceContainerAction {
public UpAction() {
super(SourceLookupUIMessages.sourceTab_upButton);
}
/**
* Moves all selected entries up one position (if possible).
*
* @see IAction#run()
*/
public void run() {
List targets = getOrderedSelection();
if (targets.isEmpty()) {
return;
}
int top = 0;
int index = 0;
List list = getEntriesAsList();
Iterator entries = targets.iterator();
while (entries.hasNext()) {
Object target = entries.next();
index = list.indexOf(target);
if (index > top) {
top = index - 1;
Object temp = list.get(top);
list.set(top, target);
list.set(index, temp);
}
top = index;
}
setEntries(list);
}
/**
* @see SelectionListenerAction#updateSelection(IStructuredSelection)
*/
protected boolean updateSelection(IStructuredSelection selection) {
//check that something is selected, it's not first in the list, and it is a root tree node.
return !selection.isEmpty() && !isIndexSelected(selection, 0) && getViewer().getTree().getSelection()[0].getParentItem()==null;
}
}
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