How to make my JPanel scrollable

[Adriano Bellavita]

Hi guys!

I have created a JFrame in a new application.

The JFrame content pane is a simple JPanel with no layout.

The code looks like that:

public class MyFrame extends JFrame {

private JPanel contentPane = new JPanel();

public MyFrame() {

		setBounds(Constants.Frame.FRAME_DIMENSION);
		contentPane.setBorder(new EmptyBorder(25, 25, 25, 25));
		setContentPane(contentPane);
		contentPane.setLayout(null);
}

}

I have added a lot of components to contentPane, so the height of all these components is bigger than the Frame height.

Ho can I add a scroll bar to my Jpanel, in the way that all the components will be displayed by a user?

I have read something abount JScrollPane, but I am not able to obtain the result...

TY and BR,

Adriano.

[Michael Dunn]

> I have read something abount JScrollPane, but I am not able to obtain the result...

why not?/what happened?/post the code you've tried

[Campbell Ritchie]

Start in the Java Tutorials.

[Adriano Bellavita]

Hi have try to put the Jpanel, that contains all my components, into a JScrollablePane, in this way:

private JPanel contentPane = new JPanel(); 
private JScrollPane scrollPane = new JScrollPane(contentPane);

public MyFrame() { 
setContentPane(scrollPane);
scrollPane.add(contentPane);

contentPane.add(component1);
contentPane.add(component1);
....

}

Nothing is showed...

[Adriano Bellavita]

I have read the tutorial: that's what I've learn:

"Here's the code that creates the text area, makes it the scroll pane's client, and adds the scroll pane to a container:"

So, in my case, a Jpanel is the ScrollPane's client.

Than, I have added the scollPane to my container (JFrame)...

[Michael Dunn]

> JScrollPane scrollPane = new JScrollPane(contentPane);
this is correct

> scrollPane.add(contentPane);
this will never work (it's scrollPane.setViewportView(contentPane) - excuse typos)

this is likely to be the problem:
> The JFrame content pane is a simple JPanel with no layout.

the basics of a scrollpane is that the preferredSize of the component in the viewport
must be bigger than the preferredeSize of the scrollpane - i.e. if the panel has no layout,
then it has no preferredSize = you must set it.

[Adriano Bellavita]

It works!!!

TY!!!