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/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.events;


/**
 * This adapter class provides default implementations for the
 * methods described by the TreeListener interface.
 * 
 * Classes that wish to deal with TreeEvents can
 * extend this class and override only the methods which they are
 * interested in.
 * 
 * 
 * An alternative to this class are the static helper methods
 * {@link TreeListener#treeCollapsedAdapter(java.util.function.Consumer)}
 * and
 * {@link TreeListener#treeExpandedAdapter(java.util.function.Consumer)},
 * which accept a lambda expression or a method reference that implements the event consumer.
 * 
 *
 * @see TreeListener
 * @see TreeEvent
 * @see Sample code and further information
 */
public abstract class TreeAdapter implements TreeListener {

/**
 * Sent when a tree branch is collapsed.
 * The default behavior is to do nothing.
 *
 * @param e an event containing information about the tree operation
 */
@Override
public void treeCollapsed(TreeEvent e) {
}

/**
 * Sent when a tree branch is expanded.
 * The default behavior is to do nothing.
 *
 * @param e an event containing information about the tree operation
 */
@Override
public void treeExpanded(TreeEvent e) {
}
}