Name: dbT83986 Date: 03/21/99


After call java.awt.ScrollPane#setScrollPosition(),
a component in ScrollPane slieded 2dots a moment.
So component image flickers.
But when Scrollbar's Thumb pressed, did'n this problem.

1)Execute following Souce(ScrollPaneTest.java).
2)Press DownKey or UpKey.
3)ScrollPaneTest$ChildPane will be off to the right side
  about 2 dots.

This Problem happen JDK1.1.7 or later(JDK1.2);
Before JDK1.1.6 not happened.

Thank you.

=================ScrollPaneTest.java=========================
import java.awt.*;
import java.awt.event.*;

public class ScrollPaneTest extends ScrollPane {
    public static void main(String[] args) {
        Frame f = new Frame("ScrollPaneTest");
        ScrollPane sp = new ScrollPaneTest(300, 300);
        f.add(sp);
        f.setSize(100, 100);
        f.show();
        sp.requestFocus();
    }

    public ScrollPaneTest(int w, int h) {
        super(ScrollPane.SCROLLBARS_AS_NEEDED);
        Component c = new ChildPane(w, h);
        addImpl(c, null, 0);
    }

    class ChildPane extends Component implements KeyListener, FocusListener {
        int Margin = 10;
        public ChildPane(int w, int h) {
            setSize(w, h);
            addKeyListener(this);
            ScrollPaneTest.this.addFocusListener(this);
        }

        public Dimension getPreferredSize() {
            return(getSize());
        }

        public void paint(Graphics g) {
            Rectangle rect = g.getClipBounds();
            g.setColor(Color.black);
            for(int x = Margin; x < rect.x + rect.width; x += Margin)
                g.drawLine(x, rect.y, x, rect.y + rect.height);
        }

        public void keyPressed(KeyEvent e) {
            int Key = e.getKeyCode();
            if(Key == KeyEvent.VK_UP) {
                Point pos = getScrollPosition();
                setScrollPosition(pos.x, pos.y - 5);
            }
            else if(Key == KeyEvent.VK_DOWN) {
                Point pos = getScrollPosition();
                setScrollPosition(pos.x, pos.y + 5);
            }
        }

        public void keyTyped(KeyEvent e) { }

        public void keyReleased(KeyEvent e) { }

        public void focusGained(FocusEvent e) {
            requestFocus();
        }

        public void focusLost(FocusEvent e) { }
        }
    }

=================ScrollPaneTest.java=========================
(Review ID: 55685)
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