JPanel question

[thumpkidd9]

Hello,

I have a bunch of components in a JPanel, some 5 JTextFields and JButtons. The buttons were added to the JPanel first, then the textfields. I was wondering if there was a command to set the position to the textfields when I say, click a button.

Thanks,

~mp

 

[Diancecht]

I guess setLocation can be a good starting point.

Cheers,
Dian

 

[timw]

Not if you're using a LayoutManager on the panel. Without one, setLocation will probably work. With one, the position of the components are constrained by the LayoutManager.

Tim

 

[thumpkidd9]

Ok, well how does setLocation work?

say I want to default to 2nd textfield, here is just some quick code to get the idea

//class fields
JFrame frame = new JFrame();
JPanel pane = new JPanel();
JTextField textfield = new JTextField();
JTextField textfield2 = new JTextField();

// inside some method
JButton button = new JButton();
button.addActionListener(this);

pane.add(textfield);
pane.add(textfield2);
.
.
.
public void actionPerformed(ActionEvent e){ 
   Object source = e.getSource();
   if(source==button) {
     // what goes here
   }
}

I tried filling in frame.setLocation(textField2) and pane.setLocation(textField2) and neither recognized the method setLocation().

Thanks,
~mp

 

[timw]

Do you not use the Java API Docs? It saves a lot of time. Anyway, setLocation() is a method defined an a java.awt.Component (and available to its subclasses) which takes either an x, y coordinate (ints) or a java.awt.Point instance. It moves the component to a new physical location within its container (LayoutManagers usually make this impossible).

From the context of your last post, it looks more like you are wanting to set the focus to a particular component. For that, use the requestFocus() method on the component needing to acquire the focus.

Tim

 

[Diancecht]

Let's point him:

http://java.sun.com/j2se/1.4.2/docs/api/java/awt/Component.html#setLocation(int, int)

Btw, I like that way of testing the methods in all classes and with all parameters until it works

Cheers,
Dian

 

[thumpkidd9]

Thanks, I got it working. Good idea about testing all the methods I will remember that in future.

Thanks,
~mp

 

[timw]

Thumpkidd9, I think Dian was being 'ironic' with his 'way of testing' remark. It's not a performant way to write code. Use the Java Apidocs. You CANNOT be an effective Java programmer without them (unless you are telepathic).

Tim

 

[Diancecht]

Arghh, damned english, you can never know if your irony will be understood. But tim is out there to keep everyhting in order ...

Cheers,
Dian