I am unaware of any changes starting with v17 (I presume R4)
but in general, the way to process drag and drop over a picture is:
On After Edit: accept native drop or paste.
On Drop: accept custom drag and drop. $0 must be assigned 0 in On Drag Over.
On Drag Over: check if Pasteboard data size is not negative
On Begin Drag Over: append custom data to pasteboard (start custom drag and
drop)
---
I recall there were some special refactoring in 17 R4 to support the 10.12 to
10.14 range on Mac.
but the implementation should be transparent to the 4D language.
> 2019/06/14 6:06、David Ringsmuth via 4D_Tech <4d_tech@lists.4d.com>のメール:
>
> I know some things have changed with v17.4 drag and drop.
>
> When I enable a form picture object to accept drop, and I trace the “on drop”
> database method, nothing happens in the form, object method or on-drop
> database method.
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