Can't edit JTextField from within a popup window

In Java swing, I cannot edit a JTextField from within a popup window. The following code is a simple program that allows me to push a button and JTextField with the number 0 filled in appears. I want to be able to edit that 0 but I don't seem to be able to do it.

Code :

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class PopupTest {
    public static void main(String[] args) {
        final JFrame MainFrame = new JFrame();
		MainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final JPanel MainPanel = new JPanel();
		MainPanel.setLayout(new BoxLayout(MainPanel,BoxLayout.Y_AXIS));
		MainFrame.add(MainPanel);
		final JLabel TheLabel = new JLabel("Test");
		MainPanel.add(TheLabel);
		final JButton PopUpButton = new JButton("Open PopUp");
		MainPanel.add(PopUpButton);
		PopUpButton.addActionListener(new java.awt.event.ActionListener() {
			public void actionPerformed(java.awt.event.ActionEvent evt) {
				JPanel PopUpPanel = new JPanel();
				PopUpPanel.setLayout(new BoxLayout(PopUpPanel,BoxLayout.Y_AXIS));
				PopupFactory factory = PopupFactory.getSharedInstance();
				final Popup ThePopUp = factory.getPopup(MainPanel,PopUpPanel,40,40);
				JTextField Text1 = new JTextField("0");
				PopUpPanel.add(Text1);
				ThePopUp.show();
			}
		});
		MainFrame.pack();
		MainFrame.setVisible(true);
    }
}

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Try giving the popup panel a preferred size, e.g:

Code :

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JPanel PopUpPanel = new JPanel();
PopUpPanel.setPreferredSize(new Dimension(50,20));
...

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It wouldn't hurt to request focus for the text field while you're at it:

Code :

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...
ThePopUp.show();
Text1.requestFocus();

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Quote:

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Originally Posted by dlorde

Try giving the popup panel a preferred size, e.g:

Code :

---

JPanel PopUpPanel = new JPanel();
PopUpPanel.setPreferredSize(new Dimension(50,20));
...

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It wouldn't hurt to request focus for the text field while you're at it:

Code :

---

...
ThePopUp.show();
Text1.requestFocus();

---

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I tried doing those things but it still would not work.

It works for me.
I get a small window with a button, I press the button and get a white textfield with a 0. I can enter new data into the textfield.

What does it do when you execute it? What OS and version of the JDK are you using?

Quote:

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Originally Posted by Norm

It works for me.
I get a small window with a button, I press the button and get a white textfield with a 0. I can enter new data into the textfield.

What does it do when you execute it? What OS and version of the JDK are you using?

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I am using Windows Vista, NetBeans 6.9.1, and Java 1.6.0_23.

You forgot:
What does it do when you execute it?

Quote:

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Originally Posted by Norm

You forgot:
What does it do when you execute it?

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I get a small window that has a button that says "Open Popup". When I click on that button, I get a text field with a "0" filled in. When I click on the "0" it moves to the left or the right slightly, but pushing backspace does not delete it and pushing additional characters does not print the new characters.

I just got it to work. Before, I was setting PreferredSize to 50,50, but it works when I set it to 50,20.

Quote:

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Originally Posted by One

I just got it to work. Before, I was setting PreferredSize to 50,50, but it works when I set it to 50,20.

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I'm still having some similar problems with other programs. Is there a way to tell what sizes will work and what sizes will not work?

After some experimenting, I think the popup must be contained within and over the component.
Try adding this:
theFrame.setLocation(400, 300); // This causes edit to fail!!! Pop MUST be within component ???
then adjust this until it works:
final Popup thePopUp = factory.getPopup(MainPanel, popupPanel, 40, 40); // location ??

The popup must be contained within the frame's content pane borders otherwise it can't/won't get focus. If you resize the main frame so the popup pops up within the content pane, it will work. It's probably a good idea to give the frame a minimum size and set the popup coordinates relative to the frame X,Y position and height & width (allowing for caption & borders), rather than an absolute screen coordinate, so it will popup in a usable state wherever the frame is moved and/or sized.