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Display Control
From the keyboard, you enable and disable the insert character editing function using the
•
key. When enabled, the characters uIns Char" are displayed in the status line at the
bottom of the screen.
From a program executing in a host computer, you enable and disable the insert character
editing function using the following escape sequence:
ENABLE:
Ec
Q
DISABLE:
Ec R
Insert Character with Wraparound
This edit function works the same as the insert character function except that characters
forced beyond the right margin are not lost. When the rightmost non-blank character reaches
the right margin any characters that are forced over the right margin move into (are inserted
in) the next lower line at the left margin. If the next lower line becomes filled, a blank line is
then inserted above it and the character overflow from the line being edited spills into the
new line. As with the insert character function the cursor moves one column to the right
(along with the existing data) each time a character is inserted and it progresses from the
right margin of one line to the left margin of the next lower line.
This edit function is meant to be used within that portion of the workspace bounded by the
left and right margins. If you position the cursor to the left of the left margin, the insert
character with wraparound function works as described above. If you position the cursor
beyond the right margin, however, the insert character function is performed without
wraparound until the cursor reaches the right boundary and moves to the left margin of the
next lower text line. At that point the insert character function proceeds with wraparound
within the defined margins.
The movement of existing characters during an ttinsert character with wraparound" editing
operation is illustrated in figure 4-4.
When Format mode is off, any unprotected, transmit-only, alternate character set, and/or
video enhancement fields to the right of the cursor move to right with the displayable
characters. If part of such a field is forced over the right margin and into the next lower line,
the character positions left within the field on the current cursor line maintain their charac-
teristics while those that are wrapped lose their field characteristics, but maintain their
alternate character set and video enhancement characteristics.
If all of such a field is forced over the right margin and into the next lower line, the character
positions within the entire field maintain their characteristics.
If the cursor is positioned within any such field, the insert character with wraparound
function extends the range of the field by one position for each character inserted, unless the
end of the field is wrapped to the next line; in which case, the field will stay the same length.
4-14
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