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- .NH 2
- Customizing the Text Widget
- .LP
- .XS
- Customizing the Text Widget
- .XE
- .IN "Text widget" "customizing" "@DEF@"
- .LP
- The remainder of this chapter will describe customizing the Text
- widget. The Text widget may be customized by subclassing, or by
- creating new sources and sinks. Subclassing is described in
- detail in Chapter 7, this section will describe only those things that
- are specific to the Text widget. Attributes of the Text widget base
- class and creating new sources and sinks will be discussed.
- .LP
- The Text widget is made up of a number of different pieces, with the
- Text widget as the base widget class. It and the AsciiText widget are
- the only true "widgets" in the Text widget family. The other pieces
- (sources and sinks) are X Toolkit objects and have no window
- associated with them. No source or sink is useful unless assigned to
- a Text widget.
- .LP
- Each of the following pieces of the Text widget has a specific purpose,
- and will be, or has been, discussed in detail in this chapter:
- .IN "Text widget" ""
- .IP \fBText\fP 15
- This is the glue that binds everything else together. This widget reads
- the text data from the source, and displays the information in the sink.
- All translations and actions are handled in the Text widget itself.
- .IN "TextSink object" ""
- .IP \fBTextSink\fP 15
- This object is responsible for displaying and clearing the drawing area.
- It also reports the configuration of the window that contains the
- drawing area. The TextSink does not have its own window, instead it does
- its drawing on the Text widget's window.
- .IN "TextSrc object" ""
- .IP \fBTextSrc\fP 15
- This object is responsible for reading, editing and searching through the
- text buffer. This buffer can be any source of information that this
- particular TextSrc knows how to read.
- .IN "AsciiSink object" ""
- .IP \fBAsciiSink\fP 15
- This object is a subclass of the TextSink and knows how to display
- ASCII text. Support has been added to display 8-bit characters.
- .IN "AsciiSrc object" ""
- .IP \fBAsciiSrc\fP 15
- This object is a subclass of the TextSrc and knows how to read strings
- and files.
- .IN "AsciiText widget" ""
- .IP \fBAsciiText\fP 15
- This widget is a subclass of the Text widget that automatically attaches
- an AsciiSrc and AsciiSink to itself at creation time. This widget
- provides the simplest interface to the Athena Text widgets.
-
-