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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.commons.ui.swing;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JTree;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import org.databene.commons.ArrayUtil;
/**
* {@link Action} class which expands or collapses nodes of a {@link JTree}.
* Created: 23.08.2012 07:47:04
* @since 0.5.18
* @author Volker Bergmann
*/
@SuppressWarnings("serial")
public class ExpandOrCollapseTreeNodesAction extends AbstractAction {
private JTree tree;
private boolean expand;
private boolean recursive;
public ExpandOrCollapseTreeNodesAction(JTree tree, boolean expand, boolean recursive) {
super(expand ? "expand" : "collapse");
putValue(SHORT_DESCRIPTION, (expand ? "Expand tree nodes" : "Collapse tree nodes"));
this.tree = tree;
this.expand = expand;
this.recursive = recursive;
}
@Override
public void actionPerformed(ActionEvent e) {
tree.cancelEditing();
TreePath[] selectionPaths = tree.getSelectionPaths();
if (!ArrayUtil.isEmpty(selectionPaths)) {
for (TreePath path : selectionPaths)
handlePath(path);
} else {
handlePath(new TreePath(tree.getModel().getRoot()));
}
}
private void handlePath(TreePath path) {
Object node = path.getLastPathComponent();
TreeModel model = tree.getModel();
if (!model.isLeaf(node)) {
if (recursive) {
for (int i = model.getChildCount(node) - 1; i >= 0; i--)
handlePath(path.pathByAddingChild(model.getChild(node, i)));
}
if (expand)
tree.expandPath(path);
else
tree.collapsePath(path);
}
}
}