在 javahelp 中添加一个按钮菜单

Question

在我的程序中，我将 javahelp 与 helpbroker 一起使用：window 的所有 swing 组件都是自动生成和定位的。

我想自定义 helpbroker 在 window 底部添加一个按钮栏，如图所示。

最简单的方法是什么？

谢谢

Answer 1

添加帮助按钮的唯一方法是在 JFrame 中嵌入 javahelp：

public class vmHelp {
public static void main(String args[]) {
    JHelp helpViewer = null;
    String title = "";
    try {
        // Get the classloader of this class.                                                                                                                                                             
        ClassLoader cl = vmHelp.class.getClassLoader();
        // Use the findHelpSet method of HelpSet to create a URL referencing the helpset file.                                                                                                            
        // Note that in this example the location of the helpset is implied as being in the same                                                                                                          
        // directory as the program by specifying "jhelpset.hs" without any directory prefix,                                                                                                             
        // this should be adjusted to suit the implementation.                                                                                                                                            
        String lHelpSetFile = "APP.hs";
        URL url = HelpSet.findHelpSet(cl, lHelpSetFile);
        if (url == null) {
            System.err.println("URL is null, maybe the help set file is wrong: " + lHelpSetFile + ". Look at vmHelp.java");
            return;
        }
        // Create a new JHelp object with a new HelpSet.                                                                                                                                                  
        HelpSet h = new HelpSet(cl, url);
        title = h.getTitle();
        helpViewer = new JHelp(h);
        // Set the initial entry point in the table of contents.                                                                                                                                          
        helpViewer.setCurrentID("top");
    } catch (Exception e) {
        System.err.println(e.getMessage());
    }

    // Create a new frame.                                                                                                                                                                                
    JFrame frame = new JFrame();
    // Set it's size.                                                                                                                                                                                     
    frame.setSize(1000, 800);
    // Add the created helpViewer to it.                                                                                                                                                                  
    frame.getContentPane().add(helpViewer);
    // Set a default close operation.                                                                                                                                                                     
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.setTitle(title);

    // Make the frame visible.                                                                                                                                                                            
    frame.setVisible(true);
}

} 我们可以根据需要自定义JFrame后，添加一个带有关闭按钮的南面板就很简单了。

要让所有的帮助按钮都听我们的 javahelp:

pButton.addActionListener(helpAction(pHelpId));

使用显示 JFrame 的 helpAction

还要考虑处理键盘快捷键，例如 helpbroker：

pComponent.registerKeyboardAction(helpAction(pHelpId), KeyStroke.getKeyStroke(KeyEvent.VK_HELP, 0),
            JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
    pComponent.registerKeyboardAction(helpAction(pHelpId), KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0),
            JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);

要在所需部分打开帮助：

helpViewer.setCurrentID("top");

"top"对应.jhm文件中的tag

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