If, as is often the case, you have a number in an indirected icon on the
screen and you want the user to be able to alter it, it is nice to have
bumper icons next to it as well as making it writeable. For this purpose, you
can specify that an icon should decrement/increment another icon when clicked
on in the validation string. The syntax of the command is:
'wi' (increment)
Syntax:
wi<icon>,<minimum>,<maximum>,<step>
The default values are: wixx,0,&7FFFFFFF,1. All the values are optional apart
from the icon number. To make it decrement the icon instead, use a negative
step value. If the user clicks with Adjust instead of Select then the icon
will be incremented instead of decremented, or decremented instead of
incremented, in keeping with other RISC OS features.
Related SWIs: WimpExt_IncNumberIcon, WimpExt_DecNumberIcon.
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