/* * 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.")); } }