GridBagLayout by adding space between JButtons
I am trying in vain to add some space between my buttons, I tried a lot of advice like emptyBorder or glue, but I failed. Also I cannot explain the white border on Next and Previous, so I cannot remove it.
This is what I have:
Here's a running snippet:
package gridspace;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GridSpace extends JPanel {
public static void main(String[] args) {
GridSpace test = new GridSpace();
}
public GridSpace() {
JFrame frame = new JFrame();
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setLayout(new BorderLayout());
JPanel firstPanel = new JPanel();
JPanel buttonPanel = new JPanel(new GridLayout(5, 4));
JPanel buttonPanelOption = new JPanel();
firstPanel.setBackground(Color.RED);
firstPanel.setLayout(new GridBagLayout());
JButton button[] = new JButton[20];
JButton buttonNext = new JButton("Next");
JButton buttonPrevious = new JButton("Previous");
GridBagConstraints c = new GridBagConstraints();
Insets insets = new Insets(10, 10, 10, 10);
c.insets = insets;
c.weightx = 1;
c.gridwidth = 30;
buttonNext.setPreferredSize(new Dimension(100, 20));
buttonPrevious.setPreferredSize(new Dimension(100, 20));
for (int i = 0; i < 20; i++) {
button[i] = new JButton(Integer.toString(i + 1));
buttonPanel.add(button[i]);
}
c.gridx = 3;
c.gridy = 0;
firstPanel.add(buttonPanel, c);
buttonPanelOption.add(buttonPrevious);
buttonPanelOption.add(buttonNext);
c.gridx = 3;
c.gridy = 1;
firstPanel.add(buttonPanelOption, c);
frame.getContentPane().add(firstPanel);
frame.pack();
}
}
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1 answer
It has nothing to do with GridBagLayout. Improve your call to the GridLayout constructor instead. Change:
JPanel buttonPanel = new JPanel(new GridLayout(5, 4));
to
// to give a 5 point gap around each item in the grid.
JPanel buttonPanel = new JPanel(new GridLayout(5, 4, 5, 5));
Concerning:
Also I cannot explain the white border on "Next" and "Previous", so I cannot remove it
This is because JPanel keeps it opaque. Set it to opaque and the background color of the main container will be displayed.
For example:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import javax.swing.*;
public class Test3 extends JPanel {
private static final int BTN_COUNT = 20;
private static final int GAP = 5;
private static final Color BG = Color.RED;
public Test3() {
JPanel btnPanel = new JPanel(new GridLayout(0, 4, GAP, GAP));
for (int i = 0; i < BTN_COUNT; i++) {
btnPanel.add(new JButton(String.valueOf(i + 1)));
}
btnPanel.setOpaque(false);
JPanel southPanel = new JPanel(new GridLayout(1, 0, GAP, 0));
southPanel.add(new JButton("Previous"));
southPanel.add(new JButton("Next"));
southPanel.setOpaque(false);
setBackground(BG);
setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
setLayout(new BorderLayout(GAP, GAP));
add(btnPanel, BorderLayout.CENTER);
add(southPanel, BorderLayout.PAGE_END);
}
private static void createAndShowGui() {
JFrame frame = new JFrame("Test3");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new Test3());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
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