CODEWITHSUNDEEP
javaswingjframejpaneljscrollpane
helpme
helpme

Reputation: 35

How to make a Jframe containing a Jpanel scrollable?

So I have this JFrame that contains a JPanel and in there I add JLabels with information I want but since I'll be adding labels all the time at some point the text is too long to appear so I want to add a scrollbar. Basically I want to make my JFrame with a JPanel in it scrollable. I have this code but my problem is that even though the scrollbar appears but it doesnt move and doesn't really work when the text is a lot, meaning the text still gets cut out and the scrollbar is there not moving. Does anyone know how to fix this?

import javax.swing.*;
import java.awt.*;
import java.util.*;
public class Bar {
JFrame info = new JFrame("Information");
JLabel ballinf = new JLabel();
JPanel contentPane = new JPanel();
JScrollPane scrolling = new JScrollPane();

public Bar(){
    contentPane.setOpaque(true);
    contentPane.setBackground(Color.WHITE);
    contentPane.setLayout(null);

    scrolling = new JScrollPane(contentPane,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

    info.add(scrolling);
    info.setSize(750, 600);
    info.setLocationByPlatform(true);
    info.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    info.setVisible(true);
}

public void adding(int pos){       
    ballinf = new JLabel("Something ",JLabel.CENTER);//assume the text will be bigger here and have more info
    ballinf.setSize(700, 30);
    ballinf.setForeground(Color.green);
    ballinf.setLocation(5, 5+pos);
    contentPane.add(ballinf);

    info.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    info.setVisible(true);
  }

public static void main(String[] args){
    Bar stats = new Bar();
    stats.adding(0);
    stats.adding(20);//this will be done in a for loop for more than 2 times so the text ends up to be a lot
}

}

Upvotes: 0

Views: 84

Answers (1)

camickr
camickr

Reputation: 324207

contentPane.setLayout(null);

Don't use a null layout!!!

You need to use an appropriate layout manager. Read the section from the Swing tutorial on Layout Managers for more information and working examples. The layout manager will then determine the preferred size of the panel as you add components to the panel.

The scrollpane will then display the scrollbars when necessary.

If you dynamically add components to the panel (after the GUI is visible) then the code should be something like:

panel.add(...);
panel.revalidate();
panel.repaint();

Upvotes: 3

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