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Swing Chapter 25. (Special topics) JavaHelp. Easy for reading, Click here!

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Swing Chapter 25. (Special topics) JavaHelp. Easy for reading, Click here!

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Page: 4/6 

Previous Page Previous Page (3/6) - Next Page (5/6) Next Page
Subpages: 1. JavaHelp introduction
2. JavaHelp API overview
3. Basic JavaHelp example
4. Adding dialog-style help
5. Customizing the JHelp viewer
5. Creating a custom help view

25.4  Adding dialog-style help

Dialogs in modern applications quite often contain a "Help" button to invoke content-sensitive help for a particular component in that dialog (usually using an altered question mark cursor). In this section we'll show how to add such a feature provided by JavaHelp to the FTP client example we constructed in chapter 13.

Figure 25.2 FTP Client application with help buttons for default and context-sensitive help.

<<file figure25-2.gif>>

Figure 25.3 JavaHelp viewer displaying custom help for our FTP client application.

<<file figure25-3.gif>>

HelpSet file: FTP.hs

see \Chapter25\2\help

<?xml version='1.0' encoding='ISO-8859-1' ?>


   <title>FTP Client Example - Help</title>



     <mapref location="FTP.jhm"/>




     <label>Table Of Contents</label>






     <label>Help Index</label>











Map file: FTP.jhm

see \Chapter25\2\help

<?xml version='1.0' encoding='ISO-8859-1' ?>

<map version="1.0">

  <mapID target="top" url="FTPClient.html" />

  <mapID target="UserName" url="FTPClient.html#UserName" />

  <mapID target="Password" url="FTPClient.html#Password" />

  <mapID target="URL" url="FTPClient.html#URL" />

  <mapID target="File" url="FTPClient.html#File" />

  <mapID target="PutButton" url="FTPClient.html#PutButton" />

  <mapID target="GetButton" url="FTPClient.html#GetButton" />

  <mapID target="FileButton" url="FTPClient.html#FileButton" />

  <mapID target="CloseButton" url="FTPClient.html#CloseButton" />


TOC file: FTPTOC.xml

see \Chapter25\2\help

<?xml version='1.0' encoding='ISO-8859-1' ?>

<toc version="1.0">

  <tocitem target=top>FTP Client Example - TOC

    <tocitem text="User Name" target="UserName"/>

    <tocitem text="Password" target="Password"/>

    <tocitem text="URL" target="URL"/>

    <tocitem text="File" target="File"/>

    <tocitem text="Put button" target="PutButton"/>

    <tocitem text="Get button" target="GetButton"/>

    <tocitem text="File button" target="FileButton"/>

    <tocitem text="Close button" target="CloseButton"/>



Index file: FTPIndex.xml

see \Chapter25\2\help

<?xml version='1.0' encoding='ISO-8859-1'  ?>

<index version="1.0">

  <indexitem text="Index">

    <indexitem text="C">

      <indexitem target="CloseButton" text="Close button"/>


    <indexitem text="F">

      <indexitem target="File" text="File"/>

      <indexitem target="FileButton" text="File button"/>


    <indexitem text="G">

      <indexitem target="GetButton" text="Get button"/>


    <indexitem text="P">

      <indexitem target="Password" text="Password"/>

      <indexitem target="PutButton" text="Put button"/>


    <indexitem text="U">

      <indexitem target="UserName" text="User Name"/>

      <indexitem target="URL" text="URL"/>




The Code: FTPApp.java

see \Chapter25\2

// Unchanged imports from section 13.5

import javax.help.*;

public class FTPApp extends JFrame


  // Unchanged code from section 13.5

  protected HelpSet m_hs;

  protected HelpBroker m_hb;

  static final String HELPSETNAME = "Help/FTP.hs";

  public FTPApp() {

    super("FTP Client [Help]");


    JPanel p = new JPanel();

    p.setLayout(new DialogLayout2(5, 5));

    p.setBorder(new EmptyBorder(5, 5, 5, 5));

    // Unchanged code from section 13.5

    JButton btHelp = new JButton("Help");

    btHelp.setToolTipText("Show help");

    m_hb.enableHelpOnButton(btHelp, "top", null);


    btHelp = new JButton(new ImageIcon("onItem.gif"));

    btHelp.setToolTipText("Component help");


      new CSH.DisplayHelpAfterTracking(m_hb));














  protected void createHelp() {

    ClassLoader loader = this.getClass().getClassLoader();

    URL url;

    try {

      url = HelpSet.findHelpSet(loader, HELPSETNAME);

      m_hs = new HelpSet(loader, url);

      m_hb = m_hs.createHelpBroker();

      m_hb.enableHelpKey(getRootPane(), "top", m_hs);


    catch (Exception ex) { ex.printStackTrace(); }


  // Unchanged code from section 13.5


Understanding the Code

Class FTPApp

The mechanism of adding help to this application is very similar to that of the previous example. We add IDs to each button and text field component using CSH's setHelpIDString() method, and enable help invocation on the frame's JRootPane using an identical createHelp() method (see previous example).

Two new buttons are added to the button row. The first one is titled "Help". Method enableHelpOnButton() is called on the HelpBroker instance to invoke the display of the default help topic when this button is pressed. The second button receives a predefined ActionListener retrieved with the CSH.DisplayHelpAfterTracking() method. This listener displays a custom question mark cursor and displays the appropriate help topic corresponding to the clicked component. (Note that once a component is clicked and help is shown, the cursor reverts back to normal.)

Running the Code

Figure 25.2 shows our FTP client example with two new buttons to manage help. Press the "Help" button to display the default help topic (which calso can be shown using the F1 key). Try using the content-sensitive help button to bring up a help topic for a particular component, and note the use of a custom cursor.

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