1/*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/* @test
25 * @bug 8041982
26 * @summary Use of animated icon in JLayer causes CPU spin
27 * @author Alexander Potochkin
28 */
29
30import javax.swing.*;
31import javax.swing.plaf.LayerUI;
32import java.awt.*;
33import java.beans.PropertyChangeEvent;
34
35public class bug8041982 extends JFrame {
36
37    public bug8041982() {
38        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
39        add(new JLayer<>(new JPanel(), new BusyLayer()));
40        setSize(200, 300);
41        setVisible(true);
42    }
43
44    public static void main(String... args) throws Exception {
45        SwingUtilities.invokeLater(new Runnable() {
46            public void run() {
47                new bug8041982().setVisible(true);
48            }
49        });
50        Thread.sleep(5000);
51    }
52
53    private class BusyLayer extends LayerUI<JComponent> {
54        private volatile boolean animated = true;
55        private Icon icon = new ImageIcon(bug8041982.class.getResource("cupanim.gif"));
56        private int imageUpdateCount;
57
58        @Override
59        public void paint(Graphics g, JComponent c) {
60            super.paint(g, c);
61            if (isAnimated()) {
62                icon.paintIcon(c, g, c.getWidth() / 2 - icon.getIconWidth() /
63                        2,
64                        c.getHeight() / 2 - icon.getIconHeight() / 2);
65            }
66        }
67
68        public boolean isAnimated() {
69            return animated;
70        }
71
72        public void setAnimated(boolean animated) {
73            if (this.animated != animated) {
74                this.animated = animated;
75                firePropertyChange("animated", !animated, animated);
76            }
77        }
78
79        @Override
80        public void applyPropertyChange(PropertyChangeEvent evt, JLayer l) {
81            // this will be called when the busy flag is changed
82            l.repaint();
83        }
84
85        @Override
86        public boolean imageUpdate(Image img, int infoflags, int x, int y, int w, int h, JLayer<? extends JComponent> l) {
87            System.out.println("imageUpdate " + imageUpdateCount);
88            if (imageUpdateCount++ == 100) {
89                setAnimated(false);
90            } else if (imageUpdateCount > 100) {
91                throw new RuntimeException("Test failed");
92            }
93            return isAnimated() && super.imageUpdate(img, infoflags, x, y, w, h, l);
94        }
95    }
96}
97
98