GridLayout を使用して JPanel に挿入されたボタンに特定のサイズを設定するのに苦労しています。
ボタンは常にパネル全体を埋めますが、グリッドレイアウトを削除すると、ボタンは同じ動作をしなくなります。
ヒントはありますか？
package panels;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class ColorDisplay {
private final int X = 100;
private final int Y = 100;
private final Dimension PANEL_SIZE = new Dimension(500,500);
private JTextField textRed;
private JTextField textGreen;
private JTextField textBlue;
private JLabel labelText, labelRed, labelGreen, labelBlue;
private JPanel displayPanel;
private JPanel textPanel;
private JPanel buttonPanel;
private JButton button;
private final Font font = new Font("Arial", Font.PLAIN, 22);
public static void main(String[] args) {
// TODO Auto-generated method stub
new ColorDisplay();
}
public ColorDisplay(){
JFrame mainFrame = new JFrame();
// make sure the program exits when the frame close
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setTitle("Color Display");
mainFrame.setLocation(X,Y);
mainFrame.setPreferredSize(PANEL_SIZE);
// ensure an elastic layout
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.setLocationByPlatform(true);
mainFrame.add(getColorPanel());
mainFrame.add(getTextPanel());
mainFrame.add(getButtonPanel());
mainFrame.pack();
mainFrame.setVisible(true);
}
public JPanel getColorPanel(){
displayPanel = new JPanel(new BorderLayout());
labelText = new JLabel("Color Display", JLabel.CENTER);
Font fontColorDisplay = new Font("Arial", Font.PLAIN, 42);
labelText.setFont(fontColorDisplay);
displayPanel.add(labelText);
return displayPanel;
}
public JPanel getTextPanel(){
textPanel = new JPanel(new GridLayout(2,3));
labelRed = new JLabel("Red", JLabel.CENTER);
labelGreen = new JLabel("Green", JLabel.CENTER);
labelBlue = new JLabel("Blue", JLabel.CENTER);
textRed = new JTextField();
textGreen = new JTextField();
textBlue = new JTextField();
labelRed.setFont(font);
labelGreen.setFont(font);
labelBlue.setFont(font);
textRed.setFont(font);
textGreen.setFont(font);
textBlue.setFont(font);
textPanel.add(labelRed);
textPanel.add(labelGreen);
textPanel.add(labelBlue);
textPanel.add(textRed);
textPanel.add(textGreen);
textPanel.add(textBlue);
return textPanel;
}
public JPanel getButtonPanel(){
buttonPanel = new JPanel(new BorderLayout());
button = new JButton("Display Color");
button.addActionListener(new ButtonListener ()); // Add event handler
button.setFont(font);
button.setPreferredSize(new Dimension(100, 100));
buttonPanel.add(button);
return buttonPanel;
}
private int getColor(){
String colorCode = textRed.getText() + textGreen.getText() + textBlue.getText();
return Integer.parseInt(colorCode);
}
private boolean validateColor(String textValue){
boolean isValid = false;
try {
int num1 = Integer.parseInt(textValue);
if (num1 >= 0 && num1 <= 255)
isValid = true;
else
{
isValid = false;
JOptionPane.showConfirmDialog(null, "Please enter numbers between 0 and 255", "Error", JOptionPane.PLAIN_MESSAGE);
}
} catch (NumberFormatException e) {
JOptionPane.showConfirmDialog(null, "Please enter numerical values", "Error", JOptionPane.PLAIN_MESSAGE);
}
return isValid;
}
private class ButtonListener implements ActionListener { // Inner class
public void actionPerformed(ActionEvent event) {
if (validateColor(textRed.getText()) && validateColor(textGreen.getText()) && validateColor(textBlue.getText()))
{
Color bgColor = new Color(getColor());
displayPanel.setBackground(bgColor);
}
}
}
}
