Hierarchical Tree : Problem with lost Focus

Question

Forms 6i:
I have a form with a hierarchical tree.
The focus is on the tree.
Now I go into word or an other application. After that I change back to forms.
Now I cannot go into other blocks via mouse. In case, that I click in those records or blocks, I see the focus going into the record and directly going back to the tree-item.
That means, I lose my mouse in tree-forms after changing the windows applications.
Who knows a workaround ?
Gerd

Answer 1

The below given code which only accepts integers + you can not copy and paste
anything in it other than integers.
It also sets the maximum length for a JTextField
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
public class maxLengthText extends PlainDocument
int maxVal=0;
public maxLengthText(int maxLength)
maxVal = maxLength;
public void insertString(int offset, String str, AttributeSet a)
throws BadLocationException
if (getLength() + str.length() > maxVal)
return;
else
try
if(!Double.isNaN(Double.parseDouble(str)))
super.insertString(offset, str, a);
catch(Exception e)
JOptionPane.showMessageDialog(null,"Numbers Only","TextField",1,new ImageIcon("Images/warnDel.gif"));
offset=0;
public static void main(String[] args)
Document doc = new maxLengthText(5); // set maximum length to 5
JTextField txtInt= new JTextField(doc, "", 6);
JPanel panel = new JPanel();
panel.add(txtInt);
JFrame frame = new JFrame("My TextField");
frame.setContentPane(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(160, 80);
frame.setVisible(true);
}