org.eclipse.team.internal.ui.synchronize.actions.ExpandAllAction.java Source code

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Here is the source code for org.eclipse.team.internal.ui.synchronize.actions.ExpandAllAction.java

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/*******************************************************************************
 * 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.team.internal.ui.synchronize.actions;

import java.util.Iterator;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.*;

public class ExpandAllAction extends Action implements ISelectionChangedListener {

    private final AbstractTreeViewer viewer;

    public ExpandAllAction(AbstractTreeViewer viewer) {
        this.viewer = viewer;
        viewer.addSelectionChangedListener(this);
    }

    public void run() {
        expandAllFromSelection();
    }

    protected void expandAllFromSelection() {
        AbstractTreeViewer tree = viewer;
        if (tree == null)
            return;
        ISelection selection = tree.getSelection();
        if (!selection.isEmpty()) {
            Iterator elements = ((IStructuredSelection) selection).iterator();
            try {
                tree.getControl().setRedraw(false);
                while (elements.hasNext()) {
                    Object next = elements.next();
                    tree.expandToLevel(next, AbstractTreeViewer.ALL_LEVELS);
                }
            } finally {
                tree.getControl().setRedraw(true);
            }
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
     */
    public void selectionChanged(SelectionChangedEvent event) {
        ISelection selection = event.getSelection();
        if (selection instanceof IStructuredSelection) {
            IStructuredSelection ss = (IStructuredSelection) selection;
            setEnabled(!ss.isEmpty());
            return;
        }
        setEnabled(false);
    }
}