Drag&Drop For Grouping Objects

[orbaysim]

Hello,

I have mentioned this issue on discord before and Alex suggested me to open a Github issue.

If the development team can add the feature of dragging the objects from the objects list and dropping them to groups list for adding the object to a group, grouping would be much easier. There is a recording below to explain myself better:

https://user-images.githubusercontent.com/78256103/183881910-ece3e3ef-5c11-48e8-bbee-4124f8b556c1.mp4

[AlexandreSi]

Thanks for opening the issue!

Sumup of my investigation:

• Each list use a SortableVirtualizedItemList.
• Those lists use an instance of react dnd with a different type GD_OBJECT_WITH_CONTEXT and GD_GROUP_WITH_CONTEXT
• What we want to do is to add new targets for the objects list drag and drop or to have the same type for both list.

The issue is that the canDrop callback does not have context on the dragged object (that's to say the canMoveSelectionToItem given to SortableVirtualizedItemList by ObjectGroupsList would not be aware that the dragged item is either an object or an objects group). We would need to store the dragged object at the scene editor level.

Or we could change our drag and drop implementation so that the canDrop callback becomes aware of the dragged item(s).