/*******************************************************************************
 * Copyright (c) 2000, 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.ui.internal;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.ui.IWorkbenchPart;

/**
 * This class adds to the PluginAction support by
 * setting itself up for work within a WorkbenchPart.
 * The main difference is that it is capable of
 * processing local selection changes within a part.
 */
public class PartPluginAction extends PluginAction {
    /**
     * PartPluginAction constructor.
     */
    public PartPluginAction(IConfigurationElement actionElement, String id,
            int style) {
        super(actionElement, id, style);
    }

    /**
     * Registers this action as a listener of the workbench part.
     */
    protected void registerSelectionListener(IWorkbenchPart aPart) {
        ISelectionProvider selectionProvider = aPart.getSite()
                .getSelectionProvider();
        if (selectionProvider != null) {
            selectionProvider.addSelectionChangedListener(this);
            selectionChanged(selectionProvider.getSelection());
        }
    }

    /**
     * Unregisters this action as a listener of the workbench part.
     */
    protected void unregisterSelectionListener(IWorkbenchPart aPart) {
        ISelectionProvider selectionProvider = aPart.getSite()
                .getSelectionProvider();
        if (selectionProvider != null) {
            selectionProvider.removeSelectionChangedListener(this);
        }
    }
}
