我想在JMenuItem
不关闭的情况下添加JMenu
。一个菜单包含一个JTextField
,当我在文本字段中按 enter 时,它添加了一个菜单项。我的问题是添加的菜单项的大小太小。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JMenuItem;
import javax.swing.JTextField;
public class NewJFrame extends javax.swing.JFrame {
public NewJFrame() {
initComponents();
this.jMenu1.addSeparator();
final JTextField jTextField = new JTextField("Menu 1",20);
this.jMenu1.add(jTextField);
jTextField.addActionListener(new ActionListener( ){
@Override
public void actionPerformed(ActionEvent e) {
final JMenuItem jMenuItem = new JMenuItem(jTextField.getText());
jMenu1.add(jMenuItem);
jMenuItem.repaint();
jMenuItem.revalidate();
}
});
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>//GEN-END:initComponents
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
// End of variables declaration//GEN-END:variables
}
当我按下回车时,菜单添加了一个菜单项,但它的宽度太小了。
我该如何解决?