GridBagLayout Distribution Problem 1

[YerMom]

I'm making a reusable component that consists of a JPanel that contains a JButton and a JTextField.
The JButton and JTextField need to be at the left edge of the JPanel.
The JButon must appear on one row and the JTextField must appear in the row below the JButton.

I want the JTextField to span the width of the JPanel.
I want the JTextField to be resizable so I decided to try the GridBagLayout. To learn the GridBagLayout I created a very simple JPanel. When I test the JPanel the JButton and JTextField both appear in the center of the JPanel instead of at the left edge. How should I change my code to place the components at the left edge?

Below are two classes: the JPanel class and a tester.

Thanks for your help.

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class GbPanel extends JPanel {

	private static final long serialVersionUID = 1L;
	private JButton btn_Choose = null;
	private JTextField tfDirectory = null;

	public GbPanel() {
		super();
		initialize();
	}

	private void initialize() {

		this.setSize(300, 200);
		this.setLayout(new GridBagLayout());

		// Constraints for button
		GridBagConstraints btnConstraints = new GridBagConstraints();
		btnConstraints.gridx = 0;
		btnConstraints.gridy = 0;
		btnConstraints.gridwidth = 1;
		btnConstraints.insets = new Insets(5,5,5,5);
		btnConstraints.anchor = GridBagConstraints.WEST;

		// Constraints for text field
		GridBagConstraints tfDirConstraints = new GridBagConstraints();
		tfDirConstraints.gridx = 0;
		tfDirConstraints.gridy = 1;
		tfDirConstraints.gridwidth = 3;
		tfDirConstraints.gridheight = 1;
		tfDirConstraints.insets = new Insets(5,5,5,5);
		tfDirConstraints.anchor = GridBagConstraints.WEST;

		this.add(getBtn_Choose(), btnConstraints);
		this.add(getTfDirectory(), tfDirConstraints);
	}

	private JButton getBtn_Choose() {
		if (btn_Choose == null) {
			btn_Choose = new JButton("Set ...");
		}
		return btn_Choose;
	}

	private JTextField getTfDirectory() {
		if (tfDirectory == null) {
			tfDirectory = new JTextField("<directory>");
		}
		return tfDirectory;
	}

}

import java.awt.BorderLayout;
import javax.swing.JFrame;

public class PanelTester
{
	private void doIt()
	{
		JFrame f = new JFrame();
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		GbPanel p = new GbPanel();
		f.getContentPane().add(p);
		f.setBounds(0,0,300,100);
		f.setVisible(true);
	}
	public static void main(String args[])
	{
		PanelTester test = new PanelTester();
		test.doIt();
	}
}

 

[snitin78]

Just add a weight to your button:

btnConstraints.weightx = 1;

Nitin

 

[YerMom]

Nitin,

Thanks!

Works great.