Solved

ScrollPane Hides JPanel

Posted on 2007-11-26
11
703 Views
Last Modified: 2013-11-23
The attached code adds a JPanel to a Container.  The JPanel has a lineborder, and can be seen when I invoke the class.  However, when I add a ScrollPane, the JPanel disappears, and I'm shown a blank GUI screen.

Please note the lines marked #1, #2 & #3 in the attached code.  When I run the code with the ArithmeticLayoutManager layout manager used, #1, the problem occurs.  When I run the code with the GridLayout layout manager used, #2, the same problem occurs.  

And, when I comment out line #3, so the ScrollPane is not created, the JPanel shows up on the GUI screen fine.

Why is the ScrollPane hiding my JPanel?
package mugs;
 

import java.awt.Color;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.EventQueue;

import java.awt.GridLayout;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.WindowConstants;

import javax.swing.border.LineBorder;

import nl.marcoslot.lib.gui.layout.alm.ArithmeticLayoutManager;
 

public class Practice extends JFrame {

    

    Container panel = null;

    JPanel pnlMugs = null;
 

    public Practice() {

        init();

    }

    

    public void init() {

        panel = getContentPane();

        panel.setLayout(new ArithmeticLayoutManager()); // #1: Layout #1

        //panel.setLayout(new GridLayout());            // #2: Layout #2

        JScrollPane sp = new JScrollPane(panel);        // #3: Adding scrollpane

                

          pnlMugs = new JPanel();

        pnlMugs.setPreferredSize(new Dimension(570,750));

        LineBorder line = new LineBorder(Color.black, 1, true);

        pnlMugs.setBorder(line);

        pnlMugs.setOpaque(false);

        

        panel.add(pnlMugs,"x=10;y=10");

        

        setSize(700, 850);

        setTitle("Practice");

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }
 

    public static void main(String args[]) {

        EventQueue.invokeLater(new Runnable() {

            public void run() {

                new Practice().setVisible(true);

            }

        });

    }

    

}

Open in new window

0
Comment
Question by:LarryAndro
11 Comments
 
LVL 24

Accepted Solution

by:
sciuriware earned 450 total points
Comment Utility
I would expect you to add a JScrollPane to the content pane:

JPanel p = ...................
JScrollPane s = new JScrollPane(p);

getContentPane().add(s);

And then .... which layout for the content pane?

;JOOP!
0
 
LVL 24

Assisted Solution

by:sciuriware
sciuriware earned 450 total points
Comment Utility
Of course the layoutmanager for the content pane is set before adding components to it.

;JOOP!
0
 
LVL 92

Assisted Solution

by:objects
objects earned 50 total points
Comment Utility
your panel disappears because you add it to your scroll pane (which would remove it from your gui (a component can only have one parent).
you then don't add your scroll to your gui.

try what sciuriware has suggested above
0
 
LVL 1

Author Closing Comment

by:LarryAndro
Comment Utility
The scuriware approach worked.  Thanks, both of you!

(I submitted points on this question several hours ago.  I don't know why my submission didn't "take."  :(    )
0
 
LVL 24

Expert Comment

by:sciuriware
Comment Utility
:))
0
Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

 
LVL 1

Author Comment

by:LarryAndro
Comment Utility
Something is wrong with the Experts-Exchange website, or I don't understand their interface.  Yesterday, I closed call with a comment, and it didn't happen and the comment wasn't recorded.  Later, I closed call again with comment.  That time, the call was closed.  But, I don't see my comment.  Hmmm...
0
 
LVL 24

Expert Comment

by:sciuriware
Comment Utility
Please post your original comment again.
May be you hit the wrong button,
;JOOP!
0
 
LVL 1

Author Comment

by:LarryAndro
Comment Utility
The comment didn't add anything technically.  Both times I closed the call, adding a comment during the process saying basically that "it worked."  
0
 
LVL 1

Author Comment

by:LarryAndro
Comment Utility
Every comment I add, when I add only comments shows up for review.  The comments added when I close the question don't show up.  Maybe this is a feature and not a bug.  In the future, I will add a comment, and as a second action close the question; two separate actions.
0
 
LVL 24

Expert Comment

by:sciuriware
Comment Utility
I'm afraid that closing and adding comments can't be done at the same time.
Don't worry.

;JOOP!
0
 
LVL 5

Expert Comment

by:Netminder
Comment Utility
Folks,

Experts Exchange has added a feature to the closing process that gives the Asker an opportunity to fill out a survey on the question and leave a comment; however, that comment appears only to the people receiving points and the Asker (I don't even see them at this point).

Netminder
Site Admin
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Programmer's Notepad is, one of the best free text editing tools available, simply because the developers appear to have second-guessed every weird problem or issue a programmer is likely to run into. One of these problems is selecting and deleti…
Jaspersoft Studio is a plugin for Eclipse that lets you create reports from a datasource.  In this article, we'll go over creating a report from a default template and setting up a datasource that connects to your database.
The viewer will learn how to use NetBeans IDE 8.0 for Windows to connect to a MySQL database. Open Services Panel: Create a new connection using New Connection Wizard: Create a test database called eetutorial: Create a new test tabel called ee…
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now