GridBagLayout positioning

[Jose Campana]

Hiya Folks !

I'm having trouble figuring out how to place some components using GridBagLayout inside a panel. By using GridBagConstraints and its gridwidth and gridheight properties I was able to get the number of columns I wanted (just one), now I'd like to ask you guys if you know a way to place my components near the top-left corner.

Here are the important bits of my code, I've removed the NetBeans-generated code

public class TestFrame extends javax.swing.JFrame {
................
//Event that triggers on the event of the button being clicked.
private void actionjButtonActionPerformed(java.awt.event.ActionEvent evt) {
        GridBagConstraints c = new GridBagConstraints();
        c.gridwidth = 0; //This restricts to one column only
        c.gridheight = 1;
		//Add more constraints for positioning here
		//c.?();
		//c.?();
	    //Adding 3 JCheckBox(es)
        JCheckBox box = new JCheckBox();
        box.setText("new CheckBox");
        JCheckBox box1 = new JCheckBox();
        box1.setText("other Checkbox");
        JCheckBox box2 = new JCheckBox();
        box2.setText("yet another One");
        boxes.add(box);
        boxes.add(box1);
        boxes.add(box2);
        for(JCheckBox singleBox: boxes) {
            compjPanel.add(singleBox, c);
        }
        compjPanel.revalidate();
    }
    ...........................
    public TestFrame() {
        //initComponents() is NetBeans Generated 
        initComponents();
        compjPanel.setLayout(new GridBagLayout());
    }

I'm attaching two files for your better understanding. The first one(Before.jpg) shows what I've got so far, and After.jpg shows what I want to accomplish. Really easy (I guess), and I need the GridBagConstraints to make it. All Components should be placed in Left-Justified manner, like sticking to the imaginary red vertical line I drew on it.

Ok, That'd be it, I hope you can show me how to do it.

Thanks in advance, and best regards,

Jose

[Michael Dunn]

read up on GridBagConstraints' weightx and weighty

[Craig Wood]

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

public class GridBagTest {
    public static void main(String[] args) {
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(20,20,0,0);
        gbc.weightx = 1.0;
        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        panel.add(new JCheckBox("new CheckBox"), gbc);
        gbc.insets.top = 5;
        panel.add(new JCheckBox("other CheckBox"), gbc);
        panel.add(new JCheckBox("yet another One"), gbc);
        gbc.weighty = 1.0;
        panel.add(new JLabel(), gbc);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(panel);
        f.setSize(300,250);
        f.setLocation(100,100);
        f.setVisible(true);
    }
}

[Jose Campana]

Thank you Guys, especially Craig.

That is what I was looking for. I started tweaking a lot of other ways before you posted your response and I ended up abandoning GridBag. I used no layout whatsoever... however, I tested your code, and I'll keep it as my backup just in case.

Thanks for the free lesson, I kind of like Swing.

Good Luck,

Jose.