如何允许用户使用JComboBox在JTextPane中更改其字体？

Question

我发现有关JTextPanes的主题在互联网上缺少有用的文档/教程。我正在尝试做一个简单的文本处理器，我希望它能够从JComboBox中选择一个字体系列，该字体系列根据用户在其系统上安装的字体进行填充。但是，无论尝试什么，我都无法弄清楚如何使其发挥作用。

我所拥有的是一个基于JTextPane构建的工具栏类。当前，它具有许多样式按钮，可用于设置对齐方式以及粗体，斜体和下划线。

这是我的代码：

/**
* The StyleBar is used to customize styles in a Styled Document. It will take a
* JTextPane as an argument for its constructor and then all actions to be taken
* will affect the text in it.
*
* @author Andrew
*/
public class StyleBar extends JToolBar {

    private JLabel fontLbl;
    private JComboBox fontBox;

        // ...Irrelevant stuff to the problem at hand.

    /**
    * The initEvents method is used to initialize the necessary events for the
    * tool bar to actually do its job. It establishes the focus listener to the
    * buttons on the bar, and gives each one its individual functionality. It 
    * also establishes the Font Selection interface.
    */
    public void initEvents() {
        //For each item in the tool bar, add the focus listener as well as the
        //formatting listeners:
        boldFormat.addActionListener(new StyledEditorKit.BoldAction()); //boldFormat is
        boldFormat.addActionListener(resetFocus);                       //a JButton

        //Ditto for my italicsFormat and underlineFormat button(s) in the toolbar

        leftAlign.addActionListener(new StyledEditorKit.AlignmentAction(null,
                StyleConstants.ALIGN_LEFT));
        leftAlign.addActionListener(resetFocus);    //This listener just resets focus
                                                    //back onto the TextPane.

        //Ditto for my right and centerAlign buttons

        //Set up the Font list, and add a listener to the combo box
        buildFontMenu();
    }

    /**
    * The buildFontMenu detects all of the SYstem's available fonts and adds 
    * them to the Font Selection box.
    */
    public void buildFontMenu(){
        GraphicsEnvironment ge = 
                GraphicsEnvironment.getLocalGraphicsEnvironment();
        final String[] fontNames = ge.getAvailableFontFamilyNames();
        for (int i = 0; i < fontNames.length; i++){
            //What do I do here to take the entry at String[i] and make it so that when
            //the user selects it it sets the font Family in a similar way to that of
            //pressing the boldFormat button or the leftAlign button?
        }
    }

    //Everything else is irrelevant

因此，总结一下我的问题：我不知道如何正确地将侦听器设置为ComboBox，以便a）对所选的单个字体敏感，b）以某种方式使用StyledEditorKit.FontFamilyAction使生活变得轻松？

Slash，如果我正以错误的方式处理任何事情，我很想听听正确的方法。就像我说的那样，我在互联网上的消息来源对此并不十分清楚。

非常感谢！

Answer 1

StyledEditorTest将Actions放入JToolBar，但想法是相同的。另请参阅[此处]http://codingdict.com/questions/155131HTMLDocumentEditor提到的Charles
Bell’s 。例如

bar.add(new StyledEditorKit.FontFamilyAction("Serif", Font.SERIF));
bar.add(new StyledEditorKit.FontFamilyAction("SansSerif", Font.SANS_SERIF));

附录：使用时JComboBox，您可以将事件 转发 到相应的StyledEditorKit
Action，默认情况下，该会对当前选择进行操作。

JComboBox combo = new JComboBox();
combo.addItem("Serif");
combo.addItem("Sans");
combo.addActionListener(new ActionListener() {

    Action serif = new StyledEditorKit.FontFamilyAction("Serif", Font.SERIF);
    Action sans = new StyledEditorKit.FontFamilyAction("Sans", Font.SANS_SERIF);

    @Override
    public void actionPerformed(ActionEvent e) {
        if ("Sans".equals(e.getActionCommand())) {
            sans.actionPerformed(e);
        } else {
            serif.actionPerformed(e);
        }
    }
});