I am going to learn Java. And I'm trying to write a GUI for a simple calculator using GridBagLayout.
The problem is that my "+" button does not exceed 2 lines. I do not know why? I tried to do this once in the last row with:
c.gridwidth = 1;
c.gridy = 4;
c.gridx = 3;
c.gridheight = 2;
c.ipady = 26;
subpanel.add(bplus, c);
and once in the 2. last line.
c.gridwidth = 1;
c.gridy = 3;
c.gridx = 3;
c.gridheight = 2;
c.ipady = 26;
subpanel.add(bplus, c);
Here is the gui hole code, if you want to test it, maybe you need to configure the main one.
package gui;
import classes.Rechner;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class CalculatorGUI extends JFrame {
public static void main(String[] args) {
CalculatorGUI gui = new CalculatorGUI();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setVisible(true);
}
public CalculatorGUI() {
setTitle("Calculator");
setBounds(300, 300, 220, 225);
JPanel subpanel = new JPanel();
JPanel headpanel = new JPanel();
final JTextField input = new JTextField();
input.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
if (10 == e.getKeyCode()) {
Rechner rechner = new Rechner(input.getText());
input.setText(rechner.rechnen().toPlainString());
}
if (27 == e.getKeyCode()) {
input.setText("");
}
}
});
ActionListener buttonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
input.setText(input.getText() + e.getActionCommand());
}
};
ActionListener resultListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("=")) {
Rechner rechner = new Rechner(input.getText());
input.setText(rechner.rechnen().toPlainString());
} else {
input.setText("");
}
}
private void calc() {
Rechner rechner = new Rechner(input.getText());
input.setText(rechner.rechnen().toPlainString());
}
};
JButton b1 = new JButton("1");
JButton b2 = new JButton("2");
JButton b3 = new JButton("3");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("7");
JButton b8 = new JButton("8");
JButton b9 = new JButton("9");
JButton b0 = new JButton("0");
JButton bdot = new JButton(".");
JButton bplus = new JButton("+");
JButton bminus = new JButton("-");
JButton bdiv = new JButton("/");
JButton bmult = new JButton("*");
JButton bresult = new JButton("=");
JButton bcancel = new JButton("C");
b1.addActionListener(buttonListener);
b2.addActionListener(buttonListener);
b3.addActionListener(buttonListener);
b4.addActionListener(buttonListener);
b5.addActionListener(buttonListener);
b6.addActionListener(buttonListener);
b7.addActionListener(buttonListener);
b8.addActionListener(buttonListener);
b9.addActionListener(buttonListener);
b0.addActionListener(buttonListener);
bdot.addActionListener(buttonListener);
bplus.addActionListener(buttonListener);
bminus.addActionListener(buttonListener);
bdiv.addActionListener(buttonListener);
bmult.addActionListener(buttonListener);
bresult.addActionListener(resultListener);
bcancel.addActionListener(resultListener);
headpanel.setLayout(new GridBagLayout());
subpanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
c.weighty = 3;
c.gridx = 0;
c.gridy = 0;
c.ipady = 10;
headpanel.add(input, c);
setLayout(new BorderLayout());
add(headpanel, BorderLayout.NORTH);
add(subpanel, BorderLayout.SOUTH);
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0;
c.gridx = 0;
c.gridy = 0;
subpanel.add(b7, c);
c.gridx++;
subpanel.add(b8, c);
c.gridx++;
subpanel.add(b9, c);
c.gridx++;
subpanel.add(bmult, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
subpanel.add(b4, c);
c.gridx++;
subpanel.add(b5, c);
c.gridx++;
subpanel.add(b6, c);
c.gridx++;
subpanel.add(bdiv, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
subpanel.add(b1, c);
c.gridx++;
subpanel.add(b2, c);
c.gridx++;
subpanel.add(b3, c);
c.gridx++;
subpanel.add(bminus, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridheight = 1;
c.ipady = 0;
c.gridx = 0;
c.gridy = 3;
subpanel.add(bdot, c);
c.gridwidth = 2;
c.gridx++;
subpanel.add(b0, c);
c.gridwidth = 1;
c.gridx = 3;
c.gridheight = 2;
c.ipady = 26;
subpanel.add(bplus, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 1;
c.ipady = 0;
c.gridx = 0;
c.gridy = 4;
subpanel.add(bcancel, c);
c.gridx = 1;
c.gridwidth = 2;
subpanel.add(bresult, c);
}
}
I read about the error here in Stackoverflow, when you use gridx more than 0, you will have a problem with gridheight ...
At the moment, the GUI looks like this:
Thanks for your help.