[英]How to hide a Text Field when a radio button is selected/not selected?
我正在編寫一個程序來加密數據。 它具有一個JTextArea來編輯文本,但是我想選擇是否將其保存為抄寫文本或純文本格式。 為此,我創建了一個JDialog,單擊“保存”按鈕時將出現該對話框。 它包含兩個單選按鈕:一個用於保存加密的數據,另一個用於以純文本格式保存。 在它們中間,有一個JPasswordField請求加密密鑰。
我的問題是,當未選擇保存已加密的選項時,是否存在一種使TextField不可用且半透明的簡單方法。 或者,如果沒有簡單的方法可以隱藏TextArea。 我嘗試在單選按鈕上使用ChangeListener,但是它不起作用。 這是我的代碼:
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JRadioButton;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class StackOverflowVersion extends JFrame {
public static JFrame frame;
public StackOverflowVersion() {
dialogoCriptografar();
System.exit(EXIT_ON_CLOSE);
}
public void dialogoCriptografar(){
final ButtonGroup bGroup = new ButtonGroup();
JRadioButton[] buttons = new JRadioButton[2];
final JPasswordField passwordField = new JPasswordField(20);
// create the raio bunttons
buttons[0] = new JRadioButton("Encript document before saving");
buttons[1] = new JRadioButton("Just save it");
//ad them to the ButtonGroup
bGroup.add(buttons[0]);
bGroup.add(buttons[1]);
// select the option to encript
buttons[0].setSelected(true);
//creates a panel with the radio buttons and a JPasswordField
final JPanel box = new JPanel();
JLabel descricao = new JLabel("Choose an option to save:");
box.setLayout(new BoxLayout(box, BoxLayout.Y_AXIS));
box.add(descricao);
box.add(buttons[0]);
box.add(passwordField);
box.add(buttons[1]);
// creates the dialog
final JDialog dialogo = new JDialog(frame, "Storage options", true);
dialogo.setSize(275,125);
dialogo.setLocationRelativeTo(frame);
dialogo.setResizable(false);
dialogo.add(box);
dialogo.setVisible(true);
/* Doesn't work:
buttons[0].addChangeListener(new ChangeListener(){
boolean visivel = true;//ele começa visivel
public void stateChanged(ChangeEvent event){
if(visivel){
box.remove(password);
SwingUtilities.updateComponentTreeUI(dialogo);
dialogo.revalidate();
dialogo.repaint();
visivel = false;
}
else{
box.add(password);
SwingUtilities.updateComponentTreeUI(dialogo);
dialogo.revalidate();
dialogo.repaint();
SwingUtilities.updateComponentTreeUI(dialogo);
visivel = true;
}
}
});
*/
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
frame = new StackOverflowVersion();
frame.setVisible(true);
}
});
}
}
我的問題是,是否有一種簡單的方法可以使TextField不可用且半透明,
你嘗試過一個簡單的
textField.setEditable(false);
要么
textField.setEnabled(false);
在您的代碼中觀察。
1)在設置所有UI組件的屬性,事件等之后,最后添加setVisible
。
2)在您的情況下,您需要每個RadioButton的偵聽器。
3)我也更喜歡使用ItemListener而不是ChangeListener(即使將鼠標移到它上面也會觸發)。
請檢查下面的代碼。
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JRadioButton;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class Main extends JFrame {
public static JFrame frame;
public Main() {
dialogoCriptografar();
System.exit(EXIT_ON_CLOSE);
}
public void dialogoCriptografar(){
final ButtonGroup bGroup = new ButtonGroup();
final JRadioButton[] buttons = new JRadioButton[2];
final JPasswordField passwordField = new JPasswordField(20);
// create the raio bunttons
buttons[0] = new JRadioButton("Encript document before saving");
buttons[1] = new JRadioButton("Just save it");
//ad them to the ButtonGroup
bGroup.add(buttons[0]);
bGroup.add(buttons[1]);
// select the option to encript
buttons[0].setSelected(true);
//creates a panel with the radio buttons and a JPasswordField
final JPanel box = new JPanel();
JLabel descricao = new JLabel("Choose an option to save:");
box.setLayout(new BoxLayout(box, BoxLayout.Y_AXIS));
box.add(descricao);
box.add(buttons[0]);
box.add(passwordField);
box.add(buttons[1]);
// creates the dialog
final JDialog dialogo = new JDialog(frame, "Storage options", true);
dialogo.setSize(275,125);
dialogo.setLocationRelativeTo(frame);
dialogo.setResizable(false);
dialogo.add(box);
// Doesn't work:
buttons[0].addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent arg0) {
// TODO Auto-generated method stub
if(buttons[0].isSelected()) {
passwordField.setVisible(true);;
//SwingUtilities.updateComponentTreeUI(dialogo);
// System.out.println("asdasd");
box.revalidate();
box.repaint();
}
}
});
buttons[1].addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent arg0) {
// TODO Auto-generated method stub
//System.out.println("a");
if(buttons[1].isSelected()) {
passwordField.setVisible(false);;
//System.out.println("asdasd");
//SwingUtilities.updateComponentTreeUI(dialogo);
box.revalidate();
box.repaint();
}
}
}); //
dialogo.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
frame = new Main();
frame.setVisible(true);
}
});
}
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