java - 配置弹出窗口的宽度、换行和字体

Question

我是 Java 初学者。我正在使用以下代码在我的应用程序需要时显示弹出窗口。

public static int showConfirmDialog(Component parentComponent,
        Object message, String title, int optionType)
    {
        JOptionPane pane = new JOptionPane(message, JOptionPane.QUESTION_MESSAGE,
            optionType);
        //pane.setFont(new java.awt.Font("SansSerif", 0, 12));//Not working to change the font of pop-up text and button texts
        final JDialog dialog = pane.createDialog(parentComponent, title);
        dialog.setVisible(false) ;
        //dialog.setFont(new java.awt.Font("SansSerif", 0, 12)); //Not working to change the font of pop-up text and button texts
        dialog.setLocationRelativeTo(parentComponent);
        dialog.setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
        dialog.setModal(true);
        dialog.setVisible(true) ;
        dialog.dispose();
        Object o = pane.getValue();
        if (o instanceof Integer) {
            return (Integer)o;
        }
        return JOptionPane.CLOSED_OPTION;
    }

弹出窗口显示正常，但存在以下问题:

1. 如何将字体更改为弹出文本/消息和按钮文本(是/否)？
2. 如何将弹出窗口宽度限制为其父宽度？
3. 如何对弹出的文字进行换行(如文字区域的文字换行)？

更新:(1 的答案)从 JOptionPane 中获取组件并设置字体如下:

private static final String key = "OptionPane.messageFont";

//Question: QUESTION_MESSAGE
public static int showConfirmDialog(Component parentComponent,
   Object message, String title, int optionType){

    UIManager.put(key, new java.awt.Font("SansSerif", 0, 12));
    JOptionPane pane = new JOptionPane(message, JOptionPane.QUESTION_MESSAGE,
        optionType);
    JPanel buttonPanel = (JPanel)pane.getComponent(1);
    Object buttonOk[] = buttonPanel.getComponents();
      for (int i = 0; i < buttonOk.length; i++) {
        JButton button = (JButton)buttonOk[i];
            button.setFont(new java.awt.Font("SansSerif", 0, 12));
            button.validate();
      }

    pane.setFont(new java.awt.Font("SansSerif", 0, 12));
    final JDialog dialog = pane.createDialog(parentComponent, title);
    dialog.setVisible(false) ;
    dialog.setFont(new java.awt.Font("SansSerif", 0, 12));
    dialog.setLocationRelativeTo(parentComponent);
    dialog.setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
    dialog.setModal(true);
    dialog.setVisible(true) ;
    dialog.dispose();
    Object o = pane.getValue();
    if (o instanceof Integer) {
        return (Integer)o;
    }
    return JOptionPane.CLOSED_OPTION;
}

更新 2(第 3 个问题的答案):

使用下面的自动包装文本的功能。此函数依次调用 showConfirmDialog(parentComponent, message, title, optionType); showConfirmDialog(...) 的代码已在问题中给出。

/**
     * Question/Confirmation Message Dialog Multiline. 
     * It DONOT require linebreak ("\n") for multiline messages. It will automatically wrap the text to new lines.
     * Note: last when used was not properly working. Please verify it.
     */
    public static int showConfirmDialogMultiLine(Component parentComponent,
               Object message, String title, int optionType){

      JTextArea textArea = new JTextArea((String)message); 

      textArea.setColumns(50);
      textArea.setLineWrap( true );
      textArea.setWrapStyleWord( true );
      textArea.setSize(textArea.getPreferredSize().width, 1);
      textArea.setBackground(parentComponent.getBackground());
      textArea.setFont(Usability.getFont("DialogBoxes.DialogTextFont")); //$NON-NLS-1$
      textArea.setEditable(false);
      message = textArea;  
      int retVal = showConfirmDialog(parentComponent,  
              message,  
              title,  
              optionType);  
        return retVal;
    }

有人知道第二个问题的答案吗？

Answer 1

您可以使用 UIManager 来更改 OptionPane.messageFont，如下所示。

private static final String key = "OptionPane.messageFont";
...
private int showConfirmDialog(...) {
    UIManager.put(key, UIManager.getFont(key).deriveFont(Font.ITALIC, 20));
    JOptionPane pane = new JOptionPane(...);
    ...
}

附录:我从哪里获得不同的 key ？

UIManager Defaults是一个很好的资源，因为它可以检查已安装的外观实现的默认属性。