test/jdk/java/awt/ScrollPane/bug8077409Test.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
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/*
 * @test
 * @key headful
 * @bug 8077409
 * @summary Drawing deviates when validate() is invoked on java.awt.ScrollPane
 * @run main bug8077409Test
 */

import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.ScrollPane;
import java.awt.event.KeyEvent;

public class bug8077409Test extends Frame {
    ScrollPane pane;
    MyCanvas myCanvas;

    public bug8077409Test() {
        super();
        setLayout(new BorderLayout());
        pane = new ScrollPane();
        myCanvas = new MyCanvas();
        pane.add(myCanvas);
        add(pane, BorderLayout.CENTER);
        setSize(320, 480);
    }

    public static void main(String[] args) throws AWTException, InterruptedException {
        final bug8077409Test obj = new bug8077409Test();
        try {
            obj.setLocationRelativeTo(null);
            obj.setVisible(true);
            Point scrollPosition = obj.pane.getScrollPosition();
            scrollPosition.translate(0, 1);
            obj.pane.setScrollPosition(scrollPosition);
            int y = obj.pane.getComponent(0).getLocation().y;
            obj.pane.validate();
            if (y != obj.pane.getComponent(0).getLocation().y) {
                throw new RuntimeException("Wrong position of component in ScrollPane");
            }
        } finally {
            obj.dispose();
        }
    }

    @Override
    protected void processKeyEvent(KeyEvent e) {
        super.processKeyEvent(e);
    }

    class MyCanvas extends Canvas {
        @Override
        public Dimension getPreferredSize() {
            return new Dimension(400, 800);
        }

        @Override
        public void paint(Graphics g) {
            g.setColor(Color.BLACK);
            g.drawLine(0, 0, 399, 0);
            g.setColor(Color.RED);
            g.drawLine(0, 1, 399, 1);
            g.setColor(Color.BLUE);
            g.drawLine(0, 2, 399, 2);
            g.setColor(Color.GREEN);
            g.drawLine(0, 3, 399, 3);
        }

    }

}