Setting negative size of JSplitPane divider leads to unexpected results.

Name: iaR10016 Date: 12/26/2002


Filed By : J2SE-SQA [###@###.###
JDK : JDK1.4.2-b11, JDK1.4.0, JDK1.4.1.

JavaTM 2 Platform Std. Ed. v1.4.2 Specuification reads about JSplitPane.setDividerSize(int)
method:
...
public void setDividerSize(int newSize)
      Sets the size of the divider.
      Parameters:
            newSize - an integer giving the size of the divider in pixels
...

It does not specify the JSplitPane behavior if divider size is less then zero.

In JDK1.4.2-b11 setting JSplitPane divider size to negative value leads to unexpected results.
The following test example demonstrates the bug:

--------- test.java ---------
import javax.swing.*;
import java.awt.*;

public class test extends JFrame {
    public test() {
        super("JSplitPane test");
        JSplitPane sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, true,
                 new JTextArea("I am top text area!"), new JTextArea("I am bottom text area!"));
        getContentPane().add(sp,BorderLayout.CENTER);
        sp.setDividerSize(-50);
    }

   public static void main(String[] args) {
        JFrame frame = new test();
        frame.setSize(new Dimension(400,200));
        frame.setVisible(true);
    }

}
-----------------------------

Please, compile and run this example and than press Enter in the top text area.

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