JPanel/JScrollPane issue

[Moncleared]

Hi,

I'm trying to create a simple application that has a Navigation Panel and a Content Panel. What I've created thus far is a Frame that holds a JPanel. This JPanel contains a JSplitPanel. The JSplitPanel holds my Nav/Content Panels.

My issue currently is that when I add say lots of objects to the Navigation JPanel it only holds X amounts. For example, if I add 500 JLabels using GridBagLayout down the rows I only see a few of them.

I assumed that since I had added this JPanel inside my JScrollPane and the JScrollPane was added to the SplitPanel that if I added too many Components it would scroll.

Hopefully the code can explain better what I am attempting :)

Any feedback/recommendation is welcome.

import java.awt.*;
import javax.swing.*;

public class Main {

	public static void main(String args[]){
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (Exception e) {
			System.out.println("Issue with setting LookAndFeel!");
		}
		javax.swing.SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				createAndShowGUI();
			}
		});
	}
	private static void createAndShowGUI() {
		
		JFrame frame = new JFrame("Test");
		frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
		frame.add(new frontPanel().getJPanel(), BorderLayout.CENTER);
		frame.pack();
		frame.setVisible(true);
		//Set Full Screen items 
		frame.setExtendedState(Frame.MAXIMIZED_BOTH);  
	}
}
@SuppressWarnings("serial")
/**
 * This class will be out front JPanel. We'll have multiple JPanels embedded in this JPanel.
 * The vision is that we'll have a JPanel for navigation on the LEFT (20%) and a JPanel for
 * editor pane on the RIGHT (80%)
 */
class frontPanel extends JPanel{
	public frontPanel(){
		this.setLayout(new BorderLayout());
		//Create our two Custom JPanels
		Navigation nav = new Navigation();
		Editor editor = new Editor(); 
		//Create our ScrollPanes to place our JPanels inside
		JScrollPane navSP = new JScrollPane(nav);
		JScrollPane editorSP = new JScrollPane(editor);
		//Create our JSplitPane which holds our two ScrollPanes
		JSplitPane sp = new JSplitPane(	JSplitPane.HORIZONTAL_SPLIT,
										navSP,
										editorSP);
		//Setup Some Common Characteristics for the JScrollPanes
		//MinimumSize with (0,0) means user can drag all the way from left/right etc.
		navSP.setMinimumSize(new Dimension(150,0));
		editorSP.setMinimumSize(new Dimension(0,0));
		//Setup Some Common Characteristics for the JSplitPane
		sp.setOneTouchExpandable(true);
		sp.setDividerLocation(150);
		//Add to our FrontPanel
		this.add(sp,BorderLayout.CENTER);
	}
	public JPanel getJPanel(){
		return this;
	}
}

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Toolkit;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Navigation extends JPanel{
	private static final long serialVersionUID = -9175807403229139466L;
	public Navigation(){
		this.setLayout(new GridBagLayout());
		GridBagConstraints c = new GridBagConstraints();
		this.setBackground(Color.BLUE);
		//Determine what the default size of the navigation panel should be
		Toolkit tk = Toolkit.getDefaultToolkit();  
		int xSize = ((int) tk.getScreenSize().getWidth());  
		int ySize = ((int) tk.getScreenSize().getHeight());
		for ( int i=0; i<500; i++){
			c.gridy = i;
			this.add(new JLabel(i+"_"), c);
		}
		this.setPreferredSize(new Dimension((int) (xSize*0.20),(int)(ySize*0.90)) );
	}

}

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JPanel;


public class Editor extends JPanel {
	private static final long serialVersionUID = 5226641103819463968L;
	public Editor() {
		this.setBackground(Color.GREEN);
		//Determine what the default size of the navigation panel should be
		Toolkit tk = Toolkit.getDefaultToolkit();  
		int xSize = ((int) tk.getScreenSize().getWidth());  
		int ySize = ((int) tk.getScreenSize().getHeight());
		this.setPreferredSize(new Dimension((int) (xSize*0.75),(int)(ySize*0.90)) );
	}
}

Thanks

[Fubarable]

I assumed that since I had added this JPanel inside my JScrollPane and the JScrollPane was added to the SplitPanel that if I added too many Components it would scroll.

It would if you didn't also set the preferredSize of your Navigation JPanel:

   public Navigation() {
      this.setLayout(new GridBagLayout());

      //..... etc......

      this.setPreferredSize(new Dimension((int) (xSize * 0.20), (int) (ySize * 0.90))); // *** !!! ***
   }

Get rid of that and you'll get rid of the artificial constraint on its size and it will scroll just fine.