具有多个输入的JOptionPane.showConfirmDialog在返回键命中时返回

Question

将JOptionPane.showConfirmDialog用于多个输入：

int result = JOptionPane.showConfirmDialog(null, panel,
            prompt, JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);

该面板按以下方式构建：

JTextField percentField = new JTextField(5);

JComboBox cb = new JComboBox(movingAveragesList);            
JPanel myPanel = new JPanel();
myPanel.add(new JLabel("Enter %:"));
myPanel.add(percentField);
myPanel.add(Box.createHorizontalStrut(5)); // a spacer
myPanel.add(new JLabel("Select MA:"));
myPanel.add(cb); 

当用户输入％字段并点击返回时，代码将返回，但不会完成组合框选择。返回键==单击确定按钮。无论如何要解决这个问题，所以OK按钮在返回之前需要点击？

Answer 1

两个选项：

三个选项：

^{（可能更多）}

• 不要使用JOptionPane，它会让你的JTextField输入默认值来调用代码来接受＆＃34;接受＆＃34;关闭它的JOptionPane。而是创建自己的模态JDialog，并忽略JTextField中的enter press或选项卡到下一个组件。
• 或您可以在JTextField中为enter键重新分配键绑定，以便不执行任何操作或选择Tab键到下一个组件。这是一个小小的琐事，但对我来说更有趣，所以我决定尝试一下，结果如下所示：

public static void main(String[] args) {
    SwingUtilities.invokeLater(() -> {
        JTextField percentField = new JTextField(5);

        // get the JTextField's action and input map
        ActionMap actionMap = percentField.getActionMap();
        int condition = JComponent.WHEN_FOCUSED; // only interested in the input where we have focus
        InputMap inputMap = percentField.getInputMap(condition);

        // get the key for the enter key press in the input map
        Object enterKey = inputMap.get(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0));

        // now re-assign its entry in the action map to tab to next component
        actionMap.put(enterKey, new AbstractAction() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
                manager.focusNextComponent();
            }
        });

        String[] myData = { "One", "Two", "Three", "Four" };
        JComboBox cb = new JComboBox(myData);
        JPanel myPanel = new JPanel();
        myPanel.add(new JLabel("Enter %:"));
        myPanel.add(percentField);
        myPanel.add(Box.createHorizontalStrut(5)); // a spacer
        myPanel.add(new JLabel("Select MA:"));
        myPanel.add(cb);

        String prompt = "Please Select";
        int result = JOptionPane.showConfirmDialog(null, myPanel, prompt,
                JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
    });
}

第三个更简单的选项：

• 只需为JTextField提供一个ActionListener，该选项卡可以标记到下一个组件。由于JTextField的ActionListener只要有焦点并按下Enter键就会被触发，这将导致按下enter时所需的动作。

public static void main(String[] args) {
    SwingUtilities.invokeLater(() -> {
        JTextField percentField = new JTextField(5);
        percentField.addActionListener(e -> {
            KeyboardFocusManager manager = KeyboardFocusManager
                    .getCurrentKeyboardFocusManager();
            manager.focusNextComponent();
        });

        String[] myData = { "One", "Two", "Three", "Four" };
        JComboBox cb = new JComboBox(myData);
        JPanel myPanel = new JPanel();
        myPanel.add(new JLabel("Enter %:"));
        myPanel.add(percentField);
        myPanel.add(Box.createHorizontalStrut(5)); // a spacer
        myPanel.add(new JLabel("Select MA:"));
        myPanel.add(cb);

        String prompt = "Please Select";
        int result = JOptionPane.showConfirmDialog(null, myPanel, prompt,
                JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
    });
}