/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* 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 com.intellij.ui;
import javax.swing.*;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeWillExpandListener;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
import java.util.Enumeration;
/**
* author: lesya
*/
public class SmartExpander {
public static void installOn(final JTree tree){
tree.addTreeWillExpandListener(new TreeWillExpandListener() {
public void treeWillCollapse(TreeExpansionEvent event) {
TreePath path = event.getPath();
Enumeration children = ((TreeNode)path.getLastPathComponent()).children();
while (children.hasMoreElements()) {
TreePath childPath = path.pathByAddingChild(children.nextElement());
if (tree.isExpanded(childPath)) {
tree.collapsePath(childPath);
}
}
}
public void treeWillExpand(TreeExpansionEvent event) {
}
});
tree.addTreeExpansionListener(new TreeExpansionListener() {
public void treeCollapsed(TreeExpansionEvent event) {
}
public void treeExpanded(TreeExpansionEvent event) {
TreePath path = event.getPath();
TreeNode lastPathComponent = (TreeNode)path.getLastPathComponent();
if (lastPathComponent.getChildCount() == 1) {
TreePath firstChildPath = path.pathByAddingChild(lastPathComponent.getChildAt(0));
tree.expandPath(firstChildPath);
}
}
});
}
}