我需要用户输入名称,并且我想禁用“确定”按钮,直到给出一些输入。我怎样才能禁用它...?
JOptionPane
允许您提供一个组件作为消息窗格以及可以在其上显示的控件/选项。
如果将正确的侦听器添加到消息组件,那么您应该能够影响用作选项的控件。
看一眼JOptionPane.showOptionDialog(组件parentComponent,对象消息,字符串标题,int optionType,int messageType,图标icon,对象[]选项,对象initialValue)
Updated
例如...
public class TestOptionPane05 {
public static void main(String[] args) {
new TestOptionPane05();
}
protected JOptionPane getOptionPane(JComponent parent) {
JOptionPane pane = null;
if (!(parent instanceof JOptionPane)) {
pane = getOptionPane((JComponent)parent.getParent());
} else {
pane = (JOptionPane) parent;
}
return pane;
}
public TestOptionPane05() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final JButton okay = new JButton("Ok");
okay.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane pane = getOptionPane((JComponent)e.getSource());
pane.setValue(okay);
}
});
okay.setEnabled(false);
final JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane pane = getOptionPane((JComponent)e.getSource());
pane.setValue(cancel);
}
});
final JTextField field = new JTextField();
field.getDocument().addDocumentListener(new DocumentListener() {
protected void update() {
okay.setEnabled(field.getText().length() > 0);
}
@Override
public void insertUpdate(DocumentEvent e) {
update();
}
@Override
public void removeUpdate(DocumentEvent e) {
update();
}
@Override
public void changedUpdate(DocumentEvent e) {
update();
}
});
JOptionPane.showOptionDialog(
null,
field,
"Get",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE,
null,
new Object[]{okay, cancel},
okay);
}
});
}
}
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)