Function Scroll() Foundation
Scrolls up, down, right, or left in a screen area.
Scroll( [<nTop>], [<nLeft>], [<nBottom>], [<nRight>], ; [<nRows>], [<nColumns>] ) --> NIL
|Value for <nRows>||scrolls|
|less than 0||<nRows> rows are scrolled down|
|exactly 0||rows are not scrolled vertically|
|greater than 0||<nRows> rows are scrolled up|
|NIL||when no value for <nRows> and <nColumns> is indicated, the entire screen area is scrolled (equivalent to the command @..CLEAR TO)|
|value for <nColumns>||scrolls|
|less than 0||<nColumns> columns are scrolled right|
|exactly 0||columns are not scrolled horizontally|
|greater than 0||<nColumns> columns are scrolled left|
|NIL||when no value for <nColumns> is indicated, the value 0 is used|
Scroll() always returns NIL.
The screen function Scroll() scrolls a specified screen segment up, down, left or right. The scroll area must be defined within the range 0, 0 to MaxRow(), MaxCol(). When no coordinates are indicated, the entire screen in the area 0, 0 to MaxRow(), MaxCol() is scrolled.
To scroll the screen segment one row up, the top line of the segment is deleted, the remaining rows shift one position upward and a blank line is shown on the bottom row of the screen segment in the default color of the system color determined with SetColor(). Scrolling down, left or right occurs in a similar manner.
Scroll() is a powerful function whose possibilities reach from simple status messages to complex browse displays.
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