Icon Flag - needs help to draw from Wimp

Bit 7 is specified in the Icon flag to specify if the icon needs help to be redraw
The Redraw_Window_Request doesn’t seem to specify icon handles, so not sure where the Wimp reports that it needs help to draw the icon.

I’d like to write some code to make an icon a bit more clever around how it deals with displaying the sprite in an icon, and assumed that this would be achieved via this bit, but I’m having no luck with it.

Does anyone know what this bit is used for, and how to use it?

SWI Wimp_SetIconState sets flags … and also redraws the icon, even if no bits are changed.

Thanks Martin, but I already know and use the Set_IconState SWI.

My particular issue was about bit 7 of the icon flag where it’s meaning is rather vague and/or misleading.

After reading though lots of 20 year posts on comp.sys.acorn.programmer it seems that this bit has confused many people over the past few decades.

is used to redraw the area behind the icon before redrawing the actual icon itself.
This is of use when you are changing the sprite of the icon with different masks apparently. So as to ensure that the sprite does not simply get redrawn over the previous sprite.

Basically, completely different meaning to what I thought it was. I thought it would issue redraw events similar to how a window does when you specify a similar bit stating it needs help to redraw as well. But apparently not.

Alright, I’m on to my next task now. Work out how to implement dragging. Should be fun.

Well that’s totally not how I expected it to work either :)