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touch:exists

 Touch Core4 Lua Event System
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SYNOPSIS

flag = touch:exists()

DESCRIPTION

Checks if a touch screen is supported by the graphics display.

RETURN VALUE

Returns a boolean indicating the presence of touch screen hardware.

NOTES

Resistive touch screens

On V4 and V4½ controllers, this function simply checks for the presence of a jumper on the display backplane. The jumper is sensed once at startup time.

USB touch screens

It takes about two seconds to detect a USB touch screen after plug-in or at system startup.

Core4 SDK 2.114.0#7929 © Teratronik elektronische Systeme GmbH   2024-04-25