Copyright 1995 by Digital Equipment Corp. 

This interface contains a few utility routines that Editor needs for operating on textports. These routines might have been in the TextPort interface, but aren't.

IMPORT TextPort;

PROCEDURE TopLineIndex(tp: TextPort.T): INTEGER;
Return the character position of the beginning of the first visible line of tp.

PROCEDURE IndexToTop(tp: TextPort.T; i: INTEGER);
Scroll tp so that the line containing index i becomes the top visible line.

END EditorXtra.