Help content StyleSheet configuration

It is possible to specify several StyleSheet themes in the Help content file. This will allow to customize the StlyeSheet of the help, the theme, or even to specify more than one theme and switch dynamically from one theme to another.

Overview

The Help content configuration allows to specify:

• The StyleSheet, if you want to replace the default StyleSheet used in the wiki^[1]
  Note that it will exactly have the same result as if you specify the css property
  in the command-line or the configuration file
• The default theme, if you want to replace the default theme used in the wiki^[2]
  Note that it will exactly have the same result as if you specify the styleSheetTheme property
  in the command-line or the configuration file
• Several named themes which willl allow you to switch the theme at runtime

For example:

   <helpContent>
      <styleSheets>
         <styleSheetTheme id="black" url="themeBlack.css"/>
      </styleSheets>
   </helpContent>

Limitations

Using themes is only possible when you use the Help system in JavaFX or in Swing but using the JavaFX rendering of the Web content.

Runtime usage

The theme used at start will always be the default theme. You can change the theme at runtime at any time by using one of the following methods:

• The HelpContentViewer.setStyleSheetTheme(String) to switch to a named theme
• The HelpContentViewer.resetStyleSheetTheme() to switch to the default theme

Example

   <helpContent>
      <styleSheets defaultStyleSheetTheme="myDefaultTheme.css">
         <styleSheetTheme id="black" url="themeBlack.css"/>
      </styleSheets>
   </helpContent>

In this example:

• The myDefaultTheme.css is the default theme which replaces the default theme provided by the tool
• The themeBlack.css is a theme associated with the black id

It is possible to switch from the new custom default theme to the theme associated with the black id at runtime.

For example in Swing:

      // get the zip file as an URL
      URL url = ...

      try {
        // create the Help factory
        JavaHelpFactory factory = new JavaHelpFactory(url);
        factory.create();
      
        // create the viewer component
        SwingHelpContentViewer viewer = new SwingHelpContentViewer();
        factory.install(viewer);
      
        JComponent pane = viewer.getHelpComponent();    
        viewer.setStyleSheetTheme("black");
      } catch (IOException | SAXException ex) {
        ex.printStackTrace();
      }