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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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 *

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package javax.swing.event;

import java.util.EventListener;

/**

 * Defines the interface for an object that listens

 * to changes in a TreeModel.

 * For further information and examples see

 * <a

 href="https://docs.oracle.com/javase/tutorial/uiswing/events/treemodellistener.html">How to Write a Tree Model Listener</a>,

 * a section in <em>The Java Tutorial.</em>

 *

 * @author Rob Davis

 * @author Ray Ryan

 */

public interface TreeModelListener extends EventListener {

    /**

     * <p>Invoked after a node (or a set of siblings) has changed in some

     * way. The node(s) have not changed locations in the tree or

     * altered their children arrays, but other attributes have

     * changed and may affect presentation. Example: the name of a

     * file has changed, but it is in the same location in the file

     * system.</p>

     * <p>To indicate the root has changed, childIndices and children

     * will be null. </p>

     *

     * <p>Use <code>e.getPath()</code>

     * to get the parent of the changed node(s).

     * <code>e.getChildIndices()</code>

     * returns the index(es) of the changed node(s).</p>

     */

    void treeNodesChanged(TreeModelEvent e);

    /**

     * <p>Invoked after nodes have been inserted into the tree.</p>

     *

     * <p>Use <code>e.getPath()</code>

     * to get the parent of the new node(s).

     * <code>e.getChildIndices()</code>

     * returns the index(es) of the new node(s)

     * in ascending order.</p>

     */

    void treeNodesInserted(TreeModelEvent e);

    /**

     * <p>Invoked after nodes have been removed from the tree.  Note that

     * if a subtree is removed from the tree, this method may only be

     * invoked once for the root of the removed subtree, not once for

     * each individual set of siblings removed.</p>

     *

     * <p>Use <code>e.getPath()</code>

     * to get the former parent of the deleted node(s).

     * <code>e.getChildIndices()</code>

     * returns, in ascending order, the index(es)

     * the node(s) had before being deleted.</p>

     */

    void treeNodesRemoved(TreeModelEvent e);

    /**

     * <p>Invoked after the tree has drastically changed structure from a

     * given node down.  If the path returned by e.getPath() is of length

     * one and the first element does not identify the current root node

     * the first element should become the new root of the tree.

     *

     * <p>Use <code>e.getPath()</code>

     * to get the path to the node.

     * <code>e.getChildIndices()</code>

     * returns null.</p>

     */

    void treeStructureChanged(TreeModelEvent e);

}