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我是Java初学者。我正在使用下面的代码在我的应用程序需要时显示一个弹出窗口。

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;
    }

弹出窗口显示正确，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. 如何将弹出宽度限制为其父宽度？
  3. 如何包装弹出文本（如将文本包装在文本区域中）？

更新：（1的答案）从 JOptionPane 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（第三个问题的答案）：

使用以下自动换行文本的功能。这个函数反过来调用问题中已经给出showConfirmDialog(parentComponent, message, title, optionType);的代码 。showConfirmDialog(...)

/**
     * 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？

4

1 回答 1

3

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：我在哪里可以获得不同的密钥？

UIManager Defaults是一个很好的资源，因为它可以检查已安装 Look & Feel 实现的默认属性。

于 2012-06-07T09:10:12.280 回答