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PRAGMA PROGRAM REFERENCE MANUAL
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Index
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All Operation
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Expand All ADDENDUM
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SET SCREEN SCROLL
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SSS
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Standard Verb
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Screen Operation
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Target =
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Lets you select whether to scroll or wrap the screen when cursor movement
extends beyond the top or bottom of the screen.
Scrolling and wrapping can de done in both directions.
The four nouns that can be used with this verb give you all possible com-
binations. Default is to scroll up when moving below the bottom and to wrap
down when moving above the top.
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SET SCREEN SCROLL to SCROLL NAME
SCROLL NAME is one of the four standard nouns to be used as the parameter to
the verb.
The four standard nouns are SCROLL UP, SCROLL DOWN, SCROLL BOTH and SCROLL
NEITHER.
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SEE ALSO: SCROLL DOWN
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The standard verb SET SCREEN SCROLL lets you select the mode of the screen; either to cause it to scroll or to wrap when cursor movement is attempted beyond the top and bottom boundaries. The possibilities are to either scroll or wrap in either of the two directions; the four nouns SCROLL UP, SCROLL DOWN, SCROLL BOTH and SCROLL NEITHER give you all possible combinations.
The default is to scroll up (when moving beyond the bottom), and to wrap down (when moving beyond the top). This will also be the case after a DELETE ALL WINDOWS, and after going to START.
Each newly created window inherits the scroll/wrap mode currently in effect. This is just like attributes, colors,etc. Each window has its own scroll/wrap mode (this is part of the window state).
The scrolling modes affect both windows and full screens similarly.
SERIAL TERMINALS
A special case exists when using a serial terminal type. It is not known how to stop serial terminals from automatically wrapping when a character is displayed at the very last position of the last line. Indeed, it may not even be possible to inhibit this action. PRAGMA therefore will NOT display to this character location at all in certain cases. Namely, if the displaying of a character to this location would cause a scroll, and if that scroll would disrupt the screen. Examples of this are when a full screen sized window is set to SCROLL NEITHER. There are a few other instances as well. In these cases, Pragma will (have to) leave this character cell blank, but the actual character WILL be stored in PRAGMA's internal screen buffer (so that a SAVE SCREEN IMAGE will correctly see it), and the cursor will move forward to the correct location. The only effect will be that this last character cell will remain blank at all times. Also, when using a memory mapped screen, this problem does not occur at all; in that case PRAGMA will display to this last character cell.
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