How to keep a GridBagLayout horizontal-axis responsive on resize and always show a vertical scroller

[Peter Lock]

Hello

Does anyone know how to keep a GridBagLayout responsive on resize and always show vertical scroll bars? I need to make something that is responsive, for smaller screens (to 1024x640) and include scroll bars. Ive tried different ideas but am missing something here. If possible can someone please take a look at the cut down code and see whats wrong with respect to making it include scrollbars and be responsive. The program needs to be able to resize from 1280x800 to 1024x640 and always include a vertical scroller. The Grid needs to stay responsive to keep everything on the horizontal axis visible (without horizontal scroller) while the vertical scroller needs to do its thing and remain visible.

At the moment when I add scroll bars the Grid full extends, taking away the benefit of using the GridBag.

Regards

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

public class ResizeExample {

    public static void main(String[] args) {
    		JPanel canvas;
    		JPanel detailsPanel;
    		JComboBox<String> materialTitlesCombo = new JComboBox<String>();
    		
    		JTextField textField1;
    		/***********************Initialize Fields******************************/
    		
    		JLabel labels[] = new JLabel[2];
    		
    		labels[0] = new JLabel("Left side - more components to add here");
    		labels[1] = new JLabel("Right side - more components to add here");
    		
    		textField1 = new JTextField(10);
    		materialTitlesCombo.addItem("-");
    		materialTitlesCombo.addItem("test");
    		materialTitlesCombo.setPreferredSize(new Dimension(250, 500));
    		materialTitlesCombo.setMinimumSize(materialTitlesCombo.getPreferredSize());
    		/****************************Create the canvas**************************/
    		canvas = new JPanel();
    		canvas.setLayout( new BorderLayout(0,0) ); //0,0 sets the margins between panels
    		/**********************Create the components panel***********************/
    		detailsPanel = new JPanel();
    		detailsPanel.setPreferredSize(new Dimension(java.awt.Toolkit.getDefaultToolkit().getScreenSize().width, 160));
    		detailsPanel.setLayout(new GridBagLayout());
    		
    		GridBagConstraints gc = new GridBagConstraints();
    		
    		gc.gridx = 0;
    		gc.gridy = 3;
    		gc.gridheight = 1;
    		gc.gridwidth = 1;
    		gc.weightx = 0.5;
    		gc.weighty = 1;
    		gc.anchor = GridBagConstraints.WEST;
    		gc.insets = new Insets(-20,20,0,0);
    		detailsPanel.add(labels[0], gc); //Left side
    		
    		gc.gridx = 1;
    		gc.gridy = 3;
    		gc.gridheight = 1;
    		gc.gridwidth = 1;
    		gc.weightx = 0.5;
    		gc.weighty = 1;
    		gc.anchor = GridBagConstraints.CENTER;
    		gc.insets = new Insets(-10,-9,0,9);
    		detailsPanel.add(textField1, gc); // TextField 1
    		
    		gc.gridx = 8;
    		gc.gridy = 3;
    		gc.gridheight = 1;
    		gc.gridwidth = 1;
    		gc.weightx = 0.5;
    		gc.weighty = 1;
    		gc.anchor = GridBagConstraints.WEST;
    		gc.insets = new Insets(-15,15,0,0);
    		detailsPanel.add(labels[1], gc);//Right side

    		//Add the details section and table sections to the canvas.
    		canvas.add(detailsPanel, BorderLayout.NORTH);
    		
	        final JScrollPane scrollPane = new JScrollPane(canvas);
	        JFrame frame = new JFrame("Swing Test");
	        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
	        frame.setSize(1000, 500);
	        //frame.setLocation(200, 200);
	        frame.getContentPane().add(canvas);
	        //frame.getContentPane().add(scrollPane);
	        frame.setVisible(true);
    }
}

[Peter Lock]

Answered: Don't forget to set panel.setMaximumSize, and panel.setPreferredSize on the panel being wrapped in the scroller . After adding this everything worked like a treat. I hope this can help someone else out there.

Regards