The VIEW PRINT statement defines the boundaries of a text viewport PRINT area.
Syntax
VIEW PRINT [topRow% TO bottomRow%]
Parameter(s)
- topRow% and bottomRow% specify the upper and lower rows of the text viewport.
- If topRow% and bottomRow% are not specified when first used, the text viewport is defined to be the entire screen.
Description
- A second VIEW PRINT statement without parameters can also disable a viewport when no longer needed.
- CLS or CLS statement will clear the active text viewport area only, and reset the cursor location to topRow%.
- A SCREEN mode change or RUN statement can also clear and disable viewports.
- After active viewport is disabled, normal screen printing and clearing can begin.
- Row coordinates may vary when a WIDTH statement has been used.
- Note: QB64 RUN statements will not close VIEW PRINT, VIEW or WINDOW view ports presently!
Example(s)
Demonstrates how text scrolls within the text viewport.
' clear the entire screen and show the boundaries of the new text viewport
CLS
PRINT "Start at top..."
LOCATE 9, 1: PRINT "<- row 9 ->"
LOCATE 21, 1: PRINT "<- row 21 ->"
' define new text viewport boundaries
VIEW PRINT 10 TO 20
' print some text that will scroll the text viewport
FOR i = 1 TO 15
PRINT "This is viewport line:"; i
SLEEP 1
NEXT i
' clear only the active text viewport with CLS or CLS 2
CLS
PRINT "After clearing, the cursor location is reset to the top of the text viewport."
' disable the viewport
VIEW PRINT
_DELAY 4
LOCATE 20, 20: PRINT "Print anywhere after view port is disabled"
_DELAY 4
CLS
PRINT "Back to top left after CLS!"
Note: The bottom row of the VIEW PRINT port can be used only when located or prints end with semicolons.