Name: gm110360 Date: 05/17/2004


FULL PRODUCT VERSION :
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b32c, mixed mode)

java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]


A DESCRIPTION OF THE PROBLEM :
The JScrollBar fails to snap back to its original position when the mouse strays
too far. This is inconsistent with the behavior of Windows bars. (It's also
inconsistent with Macintosh scroll bars, but I haven't tested on the Mac.)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the program. Drag the left pane's scroll bar down about half way. Then,
with the mouse still down, drag to the right or left about 100 pixels or more.
Compare the behavior with the native scroll bar in the right pane.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
When you drag the scroll bar too far out to either side, the scroll bar should
snap back to its original position. This makes it easy to return to your
starting point. It's the analogous behavior to dragging outside of a
Button after clicking, but before releasing. When you drag out side of the
button's boundaries, it returns to its unpressed state, and releasing the
button doesn't trigger the button's action. Both the Button and JButton behave
this way. But the JScrollBar doesn't match the behavior of the ScrollBar, or
of the native platform.

ACTUAL -
The JScrollBar continues to track the mouse motion, no matter how far the user
drags away from the JScrollBar. This is inconsistent with the Windows look and
feel. However, the native behavior on Windows (and Macintosh) is the desired
behavior for all looks and feels.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.TextArea;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.UIManager;

public class ScrollBarRestoreBug
    extends JPanel
{
private static JFrame mf;

public static void main(String[] args)
{
try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); }
catch (Exception err) { err.printStackTrace(); }
mf=new JFrame("ScrollBarRestoreBug");
mf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
ScrollBarRestoreBug view=new ScrollBarRestoreBug();
mf.getContentPane().setLayout(new BorderLayout());
mf.getContentPane().add(view, BorderLayout.CENTER);
mf.setBounds(10, 10, 600, 400);
mf.setVisible(true);
}

private ScrollBarRestoreBug()
{
super(new GridLayout(1, 2));
JTextArea ta = new JTextArea(200, 20);
ta.setLineWrap(true);
JScrollPane scr = new JScrollPane(ta);
add(scr);
TextArea ata = new TextArea(1000, 20);
StringBuffer buf = new StringBuffer();
for (int ii=0; ii<200; ++ii)
buf.append("\n" + ii);
ata.setText(buf.toString());
add(ata);
}
}

---------- END SOURCE ----------
(Incident Review ID: 269826)
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