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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 4073822
* @summary ScrollPane repaints entire window when scrolling fast
* @library /java/awt/regtesthelpers
* @build PassFailJFrame
* @run main/manual ScrollPaneFlicker
*/
import java.awt.Button;
import java.awt.Canvas;
import java.awt.Checkbox;
import java.awt.Choice;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Label;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.Panel;
import java.awt.Rectangle;
import java.awt.ScrollPane;
import java.awt.Scrollbar;
import java.awt.TextArea;
import java.awt.TextField;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class ScrollPaneFlicker {
public static void main(String[] args) throws Exception {
String INSTRUCTIONS = """
When scrolling a ScrollPane fast(i.e. holding the down/up arrow
down for a while), the ScrollPane would inexplicably refresh
the entire window.
1. Select a type of ScrollPane content from the content menu.
2. Scroll the content using the up/down/left/right arrows on
the scroll bar. Try scrolling the entire content area using
the scroll arrows-- from top to bottom and left to right.
3. Verify that the entire pane does not refresh when scrolling
- only the newly exposed areas should be repainting.
4. Repeat for all content types.
""";
PassFailJFrame.builder()
.title("Test Instructions")
.instructions(INSTRUCTIONS)
.columns(35)
.testUI(ScrollPaneFlicker::initialize)
.build()
.awaitAndCheck();
}
static Frame initialize() {
return new FlickerFrame();
}
}
class FlickerFrame extends Frame {
ScrollPane pane;
public FlickerFrame() {
super("ScrollPane Flicker Test");
TextPanel textPanel = new TextPanel();
GradientPanel gradientPanel = new GradientPanel();
ComponentPanel componentPanel = new ComponentPanel();
SwingPanel swingPanel = new SwingPanel();
MenuBar menubar = new MenuBar();
Menu testMenu = new Menu("Test Options");
pane = new ScrollPane();
pane.getHAdjustable().setUnitIncrement(8);
pane.getVAdjustable().setUnitIncrement(16);
pane.add(textPanel);
add(pane);
testMenu.add(makeContentItem("Text Lines", textPanel));
testMenu.add(makeContentItem("Gradient Fill", gradientPanel));
testMenu.add(makeContentItem("AWT Components", componentPanel));
testMenu.add(makeContentItem("Swing Components", swingPanel));
menubar.add(testMenu);
setMenuBar(menubar);
setSize(400, 300);
}
public MenuItem makeContentItem(String title, final Component content) {
MenuItem menuItem = new MenuItem(title);
menuItem.addActionListener(
ev -> {
pane.add(content);
pane.validate();
}
);
return menuItem;
}
}
class GradientPanel extends Canvas {
public void paint(Graphics g) {
// just paint something that'll take a while
int x, y;
int width = getSize().width;
int height = getSize().height;
int step = 8;
for (x = 0; x < width; x += step) {
for (y = 0; y < height; y += step) {
int red = (255 * y) / height;
int green = (255 * x * y) / (width * height);
int blue = (255 * x) / width;
Rectangle bounds = g.getClipBounds();
Rectangle fbounds = new Rectangle(x, y, x + step, y + step);
if (bounds.intersects(fbounds)) {
Color color = new Color(red, green, blue);
g.setColor(color);
g.fillRect(x, y, x + step, y + step);
}
}
}
}
public Dimension getPreferredSize() {
return new Dimension(200, 1000);
}
}
class TextPanel extends Canvas {
public void paint(Graphics g) {
Font font = new Font("SanSerif", Font.ITALIC, 12);
g.setFont(font);
// just paint something that'll take a while
int x, y;
int width = getWidth();
int height = getHeight();
int step = 16;
for (x = y = 0; y < height; y += step) {
Rectangle bounds = g.getClipBounds();
Rectangle tbounds = new Rectangle(x, y - 16, x + width, y);
if (bounds.intersects(tbounds)) {
g.drawString(y + " : The quick brown fox jumps over the lazy dog. " +
"The rain in Spain falls mainly on the plain.", x, y);
}
}
}
public Dimension getPreferredSize() {
return new Dimension(640, 1000);
}
}
class ComponentPanel extends Panel {
ComponentPanel() {
add(new Label("Label"));
add(new Button("Button"));
add(new Checkbox("Checkbox"));
Choice c = new Choice();
c.add("choice");
java.awt.List l = new java.awt.List();
l.add("list");
add(new Scrollbar());
add(new TextField("TextField"));
add(new TextArea("TextArea"));
add(new Panel());
add(new Canvas());
}
}
class SwingPanel extends JPanel {
SwingPanel() {
add(new JLabel("JLabel"));
add(new JButton("JButton"));
add(new JCheckBox("JCheckBox"));
JComboBox c = new JComboBox();
JList l = new JList();
add(new JScrollBar());
add(new JTextField("This is a JTextField with some text in it to make it longer."));
add(new JTextArea("This is a JTextArea with some text in it to make it longer."));
}
}
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