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79 lines
2.5 KiB
Markdown
79 lines
2.5 KiB
Markdown
The [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN) statement allows setting the behavior of the ALT+ENTER combo.
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## Syntax
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> [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN) [{_STRETCH|_SQUAREPIXELS|OFF|_ALL}][, {_SMOOTH|OFF|_ALL}]
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## Description
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* Calling the statement with no parameters enables all four possible full screen modes (and is the default state when a program is started): both [_STRETCH](_STRETCH) ([_SMOOTH](_SMOOTH) and _OFF) and [_SQUAREPIXELS](_SQUAREPIXELS) ([_SMOOTH](_SMOOTH) and _OFF).
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* Using [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN) _ALL, _ALL has the same effect.
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* [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN) only affects the behavior of ALT+ENTER. The [_FULLSCREEN](_FULLSCREEN) statement is not bound by [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN)'s settings so all modes can be accessed programmatically.
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* To limit just the mode but allow both _SMOOTH + _OFF antialiasing modes, pass just the first parameter: *Example:* [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN) _SQUAREPIXELS
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* To allow multiple modes with _SMOOTH or _OFF as default, pass just the second parameter. *Example:* [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN) , _SMOOTH
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* Any possible permutation of the parameters is allowed.
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* With [_ALLOWFULLSCREEN](_ALLOWFULLSCREEN) _OFF you can trap Alt+Enter manually in your program and reassign it. See example 2 below.
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## Availability
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* Version 1.3 and up.
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## Example(s)
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Allowing only one full-screen mode with square pixels and no anti-aliasing:
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```vb
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_ALLOWFULLSCREEN _SQUAREPIXELS, OFF
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```
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Disabling _FULLSCREEN with Alt+ENTER so the combo can be manually trapped:
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```vb
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DO
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CLS
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LOCATE 7
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PRINT " - Press ALT+ENTER to test trapping the combo..."
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PRINT " _ Press SPACEBAR to allow fullscreen again..."
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k& = _KEYHIT
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IF k& = 13 THEN
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IF _KEYDOWN(100307) OR _KEYDOWN(100308) THEN
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altEnter = altEnter + 1
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END IF
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ELSEIF k& = 32 THEN
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fullscreenEnabled = NOT fullscreenEnabled
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END IF
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LOCATE 14
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IF fullscreenEnabled THEN
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_ALLOWFULLSCREEN _ALL, _ALL
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altEnter = 0
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PRINT "_ALLOWFULLSCREEN _ALL, _ALL"
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LOCATE 18
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PRINT "ALT+ENTER will trigger all four fullscreen modes now."
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ELSE
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_ALLOWFULLSCREEN OFF
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PRINT "_ALLOWFULLSCREEN OFF"
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END IF
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IF altEnter THEN
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LOCATE 18
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PRINT "ALT+ENTER manually trapped"; altEnter; "times."
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END IF
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_DISPLAY
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_LIMIT 30
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LOOP
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```
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## See Also
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* [_FULLSCREEN](_FULLSCREEN), [_SMOOTH (function)](_SMOOTH-(function))
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