Java JPanel & JScrollPane

Question

I working on a application that manage image's filters etc.

I want to have scroll bars when the image is to big to be display. I put my customize panel that extend JPanel in a JScrollPane and I add it in my JFrame.

My image is displayed but not the whole image and the scroll bars are not there.

How to get the scroll-bars to appear?

Here is my code :

CustomePanel test = new ImagePanel(new File("test.jpg"));
test.setPreferredSize(new Dimension(400, 400));
JScrollPane tmp = new JScrollPane(test);
this.getContentPane().add(tmp);

[`ImageViewer`](http://stackoverflow.com/a/13463684/418556) is a working example. If you cannot sort it out based on that code, post an [SSCCE](http://sscce.org/) of your best attempt. — Andrew Thompson, May 01 '13 at 15:50
*"and I add it in my Frame"* DYM a `java.awt.Frame` or a `javax.swing.JFrame`? Don't mix Swing & AWT components without good reason. BTW - I added *"How to get the scroll-bars to appear?"* to the question, since it lacked one (a question, that is). If that is ***not*** your question, ask one of your own. — Andrew Thompson, May 01 '13 at 15:52

Reimeus · Accepted Answer · 2013-05-01T16:15:19.257

2

It is likely that your initial preferred size does not match that of your Image. Rather than using setPreferredSize, override getPreferredSize to reflect the size of the image in ImagePanel:

@Override
public Dimension getPreferredSize() {
   return new Dimension(image.getWidth(this), image.getHeight(this)); 
}

A JLabel would be a better approach here if the panel is not required as a container.

edited May 01 '13 at 16:15

answered May 01 '13 at 15:57

Reimeus

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That works, thank you a lot. May I ask you something ? I get my scrollbar on the left, and i would like to have a second on the bottom, how can i make it ? – Lenjyco May 01 '13 at 16:08
I don't really see the advantage of using a panel where a label fits better. – Andrew Thompson May 01 '13 at 16:09
Thanks again.I'm using a panel because it's mandatory on what i'm working on ^^' – Lenjyco May 01 '13 at 16:15
@AndrewThompson I would agree provided that the panel is not required for use as a container – Reimeus May 01 '13 at 16:16
1

@user2339951 Can't replicate the scrollbar issue so will ask you to post an [sscce](http://sscce.org/) – Reimeus May 01 '13 at 16:19
@Andrew Thompson nop, a project in my job. – Lenjyco May 01 '13 at 16:28

score 0 · Answer 2 · answered May 01 '13 at 16:03

0

try to set the same preferred size to scroll pane as well and test it

answered May 01 '13 at 16:03

Sanjaya Liyanage

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Java JPanel & JScrollPane

2 Answers2