NOTE 
These classes do not directly support text rendering or keyboard input. They provide the basic facility for manipulating text in memory. The Text Editing framework uses these classes as the foundation for displayable editable text data models (see Chapter 5, "Text Editing framework").
TText provides the basic protocol for manipulating strings of styled text. TText encapsulates character and style data and defines the protocol for accessing character data, inserting and deleting characters, and accessing and modifying style information.
TStandardText provides a default implementation of TText that you can generally use whenever you need to create a text object, for either styled or unstyled text. TStandardText is appropriate for text strings of any size up to 2 billion characters.
TStyleSet provides the protocol for storing the set of styles associated with a particular range of characters.
TStyle provides the abstract base protocol for character styles. Each style is defined as a style object containing the style name and the current value--for example, the style name Point size and the value 14.
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