Fix #110723: cant drop object name on object field/socket in node editor #110929
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Reference: blender/blender#110929
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Delete Branch "lichtwerk/blender:110723"
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Reason was a difference in poll functions (dropbox poll function vs.
operator poll function).
So the dropbox was actually recognized as being active (see
dropbox_active
) but then when actually dropping, the correspondingoperator wasnt called (but instead another operator was).
In detail, the way
wm_handlers_do_intern
works, it checks alldropboxes poll function if one succeeds it calls the dropbox operator.
But if that operators poll function fails,
wm_handlers_do_intern
happily continues and "ends" the drop operations in a way we dont
actually get to the "real" dropbox & operator that was also recognized
as being active.
In the case of the report:
UI_OT_drop_name
is activeNODE_OT_add_object
(node_object_drop_poll
)succeeds though
NODE_OT_add_object
(node_add_object_poll
) fails(it checks
UI_but_active_drop_name
already)So in order to make this work, add the check for
UI_but_active_drop_name
to two dropbox pollfunctions (and remove from the operator polls).
Probably good for LTS as well.
The fix itself makes sense I think. But I wonder if it really makes sense to duplicate the poll functions for dropboxes and operators. When an dropbox just references an operator, theoretically we could just call the operator poll function right? Maybe I'm missing something?
Afaict, the dropbox poll functions get direct access to the
wmDrag
[which the operator poll doesnt]It's not great to have a dropbox poll include checks for other dropboxes. But I guess it makes sense in this corner case. Maybe we could invert the order of the dropboxes instead, so the button dropboxes have priority.
For now this seems fine, although I think we can remove the poll check from the operator?
I tried registering (
ED_dropboxes_ui
) the UI dropboxes after the space dropboxes (currently this is the other way around) but that didnt change the order they were called. The proper way to do that would be to delayed_default_handlers
to happen after the area and region init inED_area_init
(tried that, would actually work, yes).However, I dont think giving a whole whole group of dropboxes priority over another group is much cleaner, I think it is more flexible and transparent to be able define/check polls that could let you give prio to whatever dropbox you like.
No strong opinion here though, your call :)
Think so, too, updated the PR.
We have to figure out what order makes the most sense: UI dropboxes before space dropboxes or the other way around. Issues like this suggest the current order may be sub-optimal, and we should consider changing it. Dependencies between different dropboxes and such tend to get out of sync, so they are code/design smells.
Anyway, this is more of a correction to a previous fix, the order of dropbox handling priority can still be changed.
If in doubt, the UI dropboxes should probably have preference (so delay
ed_default_handlers
to happen after the area and region init inED_area_init
), I would assumethere is a reason why these are called "general" which implies these should work everywhere.Can put up another PR for this if you like (it is not the easiest task to reason this though -- as I said, there might be other cases where a region dropbox should have preference, wil aslo think about this more...)