Constructor Detail

• Help

  protected Help()

  constructor for subclasses

Method Detail

• isValidID

  public abstract Boolean isValidID​(String id,
                                    boolean force)

  Test whether a given ID is valid in some known helpset. In lazy mode, should be a fast operation; if in doubt say you do not know.

  Parameters:

  id - the ID to check for validity

  force - if false, do not do too much work (be lazy) and if necessary return null; if true, must return non-null (meaning the call may block loading helpsets)

  Returns:

  whether it is valid, if this is known; else may be null (only permitted when force is false)

• showHelp

  public void showHelp​(org.openide.util.HelpCtx ctx)

  Shows help.

  Note that for basic usage it may suffice to call HelpCtx.display(), avoiding any direct dependency on this module.

  Parameters:

  ctx - help context

• showHelp

  public abstract void showHelp​(org.openide.util.HelpCtx ctx,
                                boolean showmaster)

  Shows help.

  Parameters:

  ctx - help context

  showmaster - whether to force the master helpset to be shown (full navigators) even though the supplied ID only applies to one subhelpset

• addChangeListener

  public abstract void addChangeListener​(ChangeListener l)

  Add a change listener for when help sets change.

  Parameters:

  l - the listener to add

• removeChangeListener

  public abstract void removeChangeListener​(ChangeListener l)

  Remove a change listener.

  Parameters:

  l - the listener to remove