在JOptionPane.dialog上禁用ok按钮,直到用户输入

Question

我需要用户输入一个名称,我想禁用ok按钮,直到给出一些输入.我怎么能禁用它......？

Answer 1

JOptionPane 允许您提供组件作为消息窗格以及可在其上显示的控件/选项.

如果向消息组件添加正确的侦听器,则应该能够影响用作选项的控件.

看一下JOptionPane.showOptionDialog(Component parentComponent,Object message,String title,int optionType,int messageType,Icon icon,Object [] options,Object initialValue)

更新

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);
            }
        });
    }
}

Answer 2

尝试搜索Java 的swinglabs或jGoodies库。他们已经为您需要的东西内置了类型。