我有一個JDialog有兩個JTextFields,一個ButtonGroup有兩個RadioButtons和一個OK按鈕。按鈕必須被禁用,直到TextFields被填充並且至少有一個RadioButton被點擊。我不知道如何做到這一點。禁用按鈕,如果JTextFields是空的,RadioButtons沒有檢查
它的工作原理與使用此代碼JTextFields將:
public class Test {
public static void main(String... args) {
ButtonTest.show();
}
}
class ButtonTest {
private ButtonTest() {
JFrame frame = new JFrame("Button Test");
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.setLocationByPlatform(true);
JPanel mainPanel = new JPanel(new GridLayout(4, 1));
JTextField field1 = new JTextField(20);
JTextField field2 = new JTextField(20);
JLabel text = new JLabel();
JButton printButton = new JButton("Print");
printButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
text.setText(field1.getText() + " - " + field2.getText());
}
});
printButton.setEnabled(!field1.getText().isEmpty() && !field2.getText().isEmpty());
for (JComponent c : Arrays.asList(field1, field2, text, printButton)) {
mainPanel.add(c);
}
setDocumentListener(field1, field2, printButton);
setDocumentListener(field2, field1, printButton);
frame.add(mainPanel);
frame.pack();
frame.setVisible(true);
}
private void setDocumentListener(JTextField field, JTextField other, JButton button) {
field.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
changed();
}
@Override
public void insertUpdate(DocumentEvent e) {
changed();
}
@Override
public void changedUpdate(DocumentEvent e) {
changed();
}
private void changed() {
setButtonStatus(button, field.getText(), other.getText());
}
});
}
private void setButtonStatus(JButton button, String field1, String field2) {
button.setEnabled(!field1.isEmpty() && !field2.isEmpty());
}
public static void show() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new ButtonTest();
}
});
}
}
但對於單選按鈕?我想我必須以某種方式實現ItemListener?
問候