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/*
* @ test
* @ key headful
* @ bug 8077409
* @ summary Drawing deviates when validate ( ) is invoked on java . awt . ScrollPane
* @ author mikhail . cherkasov @ oracle . com
* @ run main bug8077409Test
*/
import java.awt.*;
import java.awt.event.*;
public class bug8077409Test extends Frame {
ScrollPane pane;
MyCanvas myCanvas;
class MyCanvas extends Canvas {
public Dimension getPreferredSize() {
return new Dimension(400 , 800 );
}
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 );
}
}
public bug8077409Test() {
super ();
setLayout(new BorderLayout());
pane = new ScrollPane();
myCanvas = new MyCanvas();
pane.add(myCanvas);
add(pane, BorderLayout.CENTER);
setSize(320 , 480 );
}
@Override
protected void processKeyEvent(KeyEvent e) {
super .processKeyEvent(e);
}
public static void main(String[] args) throws AWTException, InterruptedException {
final bug8077409Test obj = new bug8077409Test();
obj.setVisible(true );
Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
@Override
public void eventDispatched(AWTEvent e) {
KeyEvent keyEvent = (KeyEvent) e;
if (keyEvent.getID() == KeyEvent.KEY_RELEASED) {
if (keyEvent.getKeyCode() == KeyEvent.VK_1) {
System.out.println(obj.pane.toString());
System.out.println("obj.myCanvas.pos: " + obj.myCanvas.getBounds());
System.out.println(obj.myCanvas.toString());
} else if (keyEvent.getKeyCode() == KeyEvent.VK_2) {
obj.repaint();
} else if (keyEvent.getKeyCode() == KeyEvent.VK_DOWN) {
Point scrollPosition = obj.pane.getScrollPosition();
scrollPosition.translate(0 , 1 );
obj.pane.setScrollPosition(scrollPosition);
} else if (keyEvent.getKeyCode() == KeyEvent.VK_UP) {
Point scrollPosition = obj.pane.getScrollPosition();
scrollPosition.translate(0 , -1 );
obj.pane.setScrollPosition(scrollPosition);
} else if (keyEvent.getKeyCode() == KeyEvent.VK_SPACE) {
obj.pane.validate();
}
}
}
}, AWTEvent.KEY_EVENT_MASK);
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" );
}
}
}
Messung V0.5 in Prozent C=95 H=90 G=92
¤ Dauer der Verarbeitung: 0.3 Sekunden
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