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The [[VIEW PRINT]] statement defines the boundaries of a text viewport | The [[VIEW PRINT]] statement defines the boundaries of a text viewport [[PRINT]] area. | ||
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{{ | {{PageParameters}} | ||
* {{Parameter|topRow%}} and {{Parameter|bottomRow%}} specify the upper and lower rows of the text viewport. | * {{Parameter|topRow%}} and {{Parameter|bottomRow%}} specify the upper and lower rows of the text viewport. | ||
* If {{Parameter|topRow%}} and {{Parameter|bottomRow%}} are not specified when first used, the text viewport is defined to be the entire screen. | * If {{Parameter|topRow%}} and {{Parameter|bottomRow%}} are not specified when first used, the text viewport is defined to be the entire screen. | ||
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* A second [[VIEW PRINT]] statement without parameters can also disable a viewport when no longer needed. | * A second [[VIEW PRINT]] statement without parameters can also disable a viewport when no longer needed. | ||
* [[CLS]] or [[CLS|CLS 2]] statement will clear the active text viewport area only, and reset the cursor location to {{Parameter|topRow%}}. | * [[CLS]] or [[CLS|CLS 2]] statement will clear the active text viewport area only, and reset the cursor location to {{Parameter|topRow%}}. | ||
* A | * 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. | * After active viewport is disabled, normal screen printing and clearing can begin. | ||
* Row coordinates may vary when a [[WIDTH]] statement has been used. | * Row coordinates may vary when a [[WIDTH]] statement has been used. | ||
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{{PageSeeAlso}} | {{PageSeeAlso}} | ||
* [https://qb64phoenix.com/forum/showthread.php?tid=1308 Featured in our "Keyword of the Day" series] | |||
* [[CLS]] | * [[CLS]] | ||
* [[WINDOW]] | * [[WINDOW]] | ||
* [[VIEW]] | * [[VIEW]] | ||
* [[LOCATE]], [[PRINT]] | * [[LOCATE]], [[PRINT]] | ||
{{PageNavigation}} | {{PageNavigation}} | ||
Latest revision as of 18:18, 25 May 2024
The VIEW PRINT statement defines the boundaries of a text viewport PRINT area.
Syntax
- VIEW PRINT [topRow% TO bottomRow%]
Parameters
- 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 2 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: 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.
See also