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/*
* Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* 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,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4270654
* @summary Tests that selection change in JTree does not cause unnecessary
scrolling.
* @library /java/awt/regtesthelpers
* @build PassFailJFrame
* @run main/manual bug4270654
*/
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
public class bug4270654 {
static final String INSTRUCTIONS = """
Select the "dan" node and scroll to the right a little using the
scrollbar. Then press down arrow key. If the tree unscrolls back
to the left, the test FAILS. Otherwise, the test PASSES.
""";
public static void main(String[] args) throws Exception {
PassFailJFrame.builder()
.title("bug4270654 Test Instructions")
.instructions(INSTRUCTIONS)
.columns(40)
.testUI(bug4270654::createUI)
.build()
.awaitAndCheck();
}
static JFrame createUI() {
JFrame f = new JFrame("JTree Scroll Back Test");
DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
String[] lev1 = {"foo", "bar", "dan"};
String[][] lev2 = {
{},
{"small", "a nice big node for testing"},
{"xyz", "pqd", "a really really big node for testing"}};
for (int i = 0; i < lev1.length; i++) {
DefaultMutableTreeNode child = new DefaultMutableTreeNode(lev1[i]);
root.add(child);
for (int j = 0; j < lev2[i].length; j++)
child.add(new DefaultMutableTreeNode(lev2[i][j]));
}
final JTree tree = new JTree(root);
tree.expandRow(3);
f.add(new JScrollPane(tree));
f.setSize(200, 200);
return f;
}
}
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