java - JOptionPane - 添加 keylistener 到 showOptionDialog

Question

我正在开发 Java Swing 应用程序。

当我退出应用程序时，optionDialog 会弹出并询问我是否要在退出前保存文件。

我想做的是选项对话框上有三个按钮(是、否、取消)我想让选项对话框通过箭头键而不是 Tab 键更改按钮的焦点。如何为optionDialog中的按钮创建按键监听器？

到目前为止，这是我的代码

Object[] options = {" YES "," NO ","CANCEL"};

int n = JOptionPane.showOptionDialog(Swing4.this,
        "File haven't save yet." +
        " \n Are you want to save the file?",                                   
        "Confirm Dialog",
        JOptionPane.YES_NO_CANCEL_OPTION,
        JOptionPane.QUESTION_MESSAGE,
        null,     //do not use a custom Icon
        options,  //the titles of buttons
        options[1]); //default button title                 

if(n == JOptionPane.YES_OPTION){            
    if(helper.updateFile("text.txt", gatherAllContent(), Swing4.this)){
        System.exit(0);
    }
    label.setText("There is something wrong on quit");

}else if(n == JOptionPane.NO_OPTION){
    System.exit(0);
}else if(n == JOptionPane.CANCEL_OPTION){
    System.out.println("Cancel");
}

Answer 1

用 showOptionDialog 不可能做到这一点，您需要自己创建一个 JOptionPane。您要找的是Container.getFocusTraversalKeys() .这是一个使用右键更改按钮焦点的工作片段(Tab 仍然有效):

    JOptionPane optionPane = new JOptionPane("File haven't save yet." +
            " \n Are you want to save the file?", JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_CANCEL_OPTION);
    JDialog dialog = optionPane.createDialog("Confirm Dialog");
    Set<AWTKeyStroke> focusTraversalKeys = new HashSet<AWTKeyStroke>(dialog.getFocusTraversalKeys(0));
    focusTraversalKeys.add(AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_RIGHT, KeyEvent.VK_UNDEFINED));
    dialog.setFocusTraversalKeys(0, focusTraversalKeys);
    dialog.setVisible(true);
    dialog.dispose();
    int option = (Integer) optionPane.getValue();