TTextProcessor is the base class for classes that process or transform
text content into different forms. The text content to be processed
is specified by {@link setText Text} property. If it is not set, the body
content enclosed within the processor control will be processed and rendered.
The body content includes static text strings and the rendering result
of child controls.
Note, all child classes must implement {@link processText} method.
processText()
abstract public method
This method must be implemented by child classes.
renderContents()
public method
This method overrides the parent implementation by replacing
the body content with the processed text content.