89 lines
3.1 KiB
Java
89 lines
3.1 KiB
Java
/*
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* Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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@test
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@bug 4198994
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@summary getInsets should return Insets object that is safe to modify
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@key headful
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@run main ClobberSharedInsetsObjectTest
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*/
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/**
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* ClobberSharedInsetsObjectTest.java
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*
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* summary: The bug is that getInsets directly returns Insets object
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* obtained from peer getInsets. The latter always return the
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* reference to the same object, so modifying this object will affect
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* other code that calls getInsets. The test checks that it's safe to
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* modify the Insets object returned by getInsets. If the change to
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* this object is not visible on the next invocation, the bug is
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* considered to be fixed.
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*/
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import java.awt.BorderLayout;
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import java.awt.Color;
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import java.awt.EventQueue;
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import java.awt.Frame;
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import java.awt.Insets;
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import java.awt.Panel;
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public class ClobberSharedInsetsObjectTest {
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static Panel p;
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// Impossible inset value to use for the test
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final static int SENTINEL_INSET_VALUE = -10;
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static Frame f;
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public static void main(String[] args) throws Exception {
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EventQueue.invokeAndWait(() -> {
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try {
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// Need a peer anyway, so let the bug manifest visuially, even
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// though we can detect it automatically.
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f = new Frame();
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p = new Panel();
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p.setBackground(Color.red);
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f.setLayout (new BorderLayout ());
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f.add(p, "Center");
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Insets insetsBefore = p.getInsets();
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insetsBefore.top = SENTINEL_INSET_VALUE;
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Insets insetsAfter = p.getInsets();
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if (insetsAfter.top == SENTINEL_INSET_VALUE) { // OOPS!
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throw new Error("4198994: getInsets returns the same object on subsequent invocations");
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}
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f.setSize (200,200);
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f.setLocationRelativeTo(null);
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f.setVisible(true);
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System.out.println("getInsets is ok. The object it returns is safe to modify.");
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} finally {
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if (f != null) {
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f.dispose();
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}
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}
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});
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}
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}
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