How do I add ScrollPane to a panel in Java?

Question

I want to add different buttons, vertically stacked, to a JPanel at run-time and use a JScrollPane so that all buttons will be visible (with some scrolling).

In order to do this, I have added my JPanel to a JScrollPane, after which I add buttons to my JPanel.

However, when I do this the vertical scrollbar does not allow me to see all images. For example when I add 7 buttons I can only scroll to see 5 full images and half of the 6 images.

Why doesn't my scrollbar allow me to display all 7 buttons?

can any body tell me how can I add a code here.... should I add it in a comment section?? — PPB, Feb 17 '10 at 17:49
To add code, you can edit your question and use the "101010" button to format the selection: http://stackoverflow.com/editing-help — trashgod, Feb 18 '10 at 04:44

score 9 · Accepted Answer · answered Feb 17 '10 at 16:55

9

Create the panel and scrollpane like:

JPanel panel = new JPanel();
JScrollPane scrollPane = new JScrollPane( panel );

When you add buttons to the panel at run time the code should be:

panel.add( button );
panel.revalidate();

As long as you are using a layout manager the preferred size will be recalculated and the scrollbar will appear.

answered Feb 17 '10 at 16:55

camickr

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Better to revalidate the scroll pane. Revalidating the panel does not always work. – finnw Feb 17 '10 at 20:20
I've never had a problem. Make sure the code is done on the EDT. Make sure you haven't hard coded the preferred size of the panel. – camickr Feb 17 '10 at 21:41

score 3 · Answer 2 · edited Feb 18 '10 at 04:45

3

Make scroll pane a wrapper over your panel - new JScrollPane (myPanel) and add it instead of naked panel in your panel's container.

You also may want to play with its setPreferredSize() method.

edited Feb 18 '10 at 04:45

trashgod

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answered Feb 17 '10 at 16:52

Roman

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playing with setPreferredSize() is what I was looking for... Thank you. – guness Aug 17 '12 at 12:45

How do I add ScrollPane to a panel in Java?

2 Answers2

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