[4909] in java-interest
Scroll bars under X11 and Windows have different range
daemon@ATHENA.MIT.EDU (Cay Horstmann)
Thu Jan 18 23:08:29 1996
From: Cay Horstmann <horstman@jupiter.SJSU.EDU>
To: "'java-interest@java.sun.com'" <java-interest@java.sun.com>
Date: Thu, 18 Jan 1996 18:16:31 -0800
Consider the following little applet. Run it under X Windows. Note how the
range of the scroll bars is 0 ... 255. Run it under Windows 95. The range
of the scroll bars is 0 ... 230.
Presumably this is a bug?
Cay
horstman@cs.sjsu.edu
import java.awt.*;
public class ScrollbarTest1 extends Frame
{ public ScrollbarTest1()
{ super("ScrollbarTest1");
Panel p = new Panel();
p.setLayout(new GridLayout(3, 2));
p.add(redLabel = new Label("Red 0"));
p.add(red = new Scrollbar(Scrollbar.HORIZONTAL, 0, 25, 0, 255));
p.add(greenLabel = new Label("Green 0"));
p.add(green = new Scrollbar(Scrollbar.HORIZONTAL, 0, 25, 0, 255));
p.add(blueLabel = new Label("Blue 0"));
p.add(blue = new Scrollbar(Scrollbar.HORIZONTAL, 0, 25, 0, 255));
add("South", p);
c = new Canvas();
c.setBackground(new Color(0, 0, 0));
add("Center", c);
}
public boolean handleEvent(Event evt)
{ if (evt.id == Event.WINDOW_DESTROY) System.exit(0);
else if (evt.id == Event.SCROLL_ABSOLUTE
|| evt.id == Event.SCROLL_LINE_DOWN
|| evt.id == Event.SCROLL_LINE_UP
|| evt.id == Event.SCROLL_PAGE_DOWN
|| evt.id == Event.SCROLL_PAGE_UP)
{ redLabel.setText("Red " + red.getValue());
greenLabel.setText("Green " + green.getValue());
blueLabel.setText("Blue " + blue.getValue());
c.setBackground(new Color(red.getValue(), green.getValue(),
blue.getValue()));
c.repaint();
return true;
}
return super.handleEvent(evt);
}
Label redLabel;
Label greenLabel;
Label blueLabel;
Scrollbar red;
Scrollbar green;
Scrollbar blue;
Canvas c;
public static void main(String[] args)
{ Frame f = new ScrollbarTest1();
f.resize(300, 200);
f.show();
}
}
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