How to tell if it's a datagrid

[Mike Kerner]

uhhh guessing:  can you check if the object has a parent?  If the parent is
a datagrid, then the object is not a datagrid

On Thu, Jan 4, 2018 at 7:13 PM, Bob Sneidar via use-livecode <
use-livecode at lists.runrev.com> wrote:

> Given an object reference, how can I tell the object is a datagrid? You
> might say, get the dgProp ["control type"], but every object contained
> within a datagrid group will ALSO return "data grid". In fact, EVERY dgProp
> arguement for every item in a datagrid group will do the same.
>
> The reason I ask is that I want to get the minimum left/top and maximum
> right/bottom of every VISIBLE object on a card that is NOT a group but
> notwithstanding INCLUDING Datagrids, so that I can set the rect of the card
> containing them in a consistent way. The thing is, groups have margins (I'm
> not going to set the margins of all my groups to 0) and these are not
> visible, so could skew the positioning of what IS visible. Datagrids do NOT
> have margins that I can tell, even though they are groups. For example, if
> I had a group on the left edge but not on the right edge, the objects on
> the card would look off center.
>
> Bob S
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