contenttreeexpandlistener.java

android_UPNP_DLNA_控制点

/*
 * Copyright (C) 2010 Teleal GmbH, Switzerland
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.teleal.cling.support.contentdirectory.ui;

import org.teleal.cling.controlpoint.ActionCallback;
import org.teleal.cling.controlpoint.ControlPoint;
import org.teleal.cling.model.meta.Service;

import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeWillExpandListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.ExpandVetoException;

/**
 * @author Christian Bauer
 */
public class ContentTreeExpandListener implements TreeWillExpandListener {

    final protected ControlPoint controlPoint;
    final protected Service service;
    final protected DefaultTreeModel treeModel;
    final protected ContentBrowseActionCallbackCreator actionCreator;

    public ContentTreeExpandListener(ControlPoint controlPoint,
                                     Service service,
                                     DefaultTreeModel treeModel,
                                     ContentBrowseActionCallbackCreator actionCreator) {
        this.controlPoint = controlPoint;
        this.service = service;
        this.treeModel = treeModel;
        this.actionCreator = actionCreator;
    }

    public void treeWillExpand(final TreeExpansionEvent e) throws ExpandVetoException {
        final DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode) e.getPath().getLastPathComponent();

        // Remove all "old" children such as the loading/progress messages
        treeNode.removeAllChildren();
        treeModel.nodeStructureChanged(treeNode);

        // Perform the loading in a background thread
        ActionCallback callback =
                actionCreator.createContentBrowseActionCallback(
                        service, treeModel, treeNode
                );
        controlPoint.execute(callback);
    }

    public void treeWillCollapse(TreeExpansionEvent e) throws ExpandVetoException {

    }

}