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Can a blender addon intercept a blender function?

1. F by falken10vdl on 12 Mar 2025, edited 13 Mar 2025 #

   I was looking to open issues and looked to this one:

   [If local view is toggled, that it turns off grid decorations. #6257

   ](https://github.com/IfcOpenShell/IfcOpenShell/issues/6257 "If local view is toggled, that it turns off grid decorations. #6257

   ")

   Is it possible for a blender addon to intercept a blender function?

   If it is possible, do you know where in Bonsai one can register a callback function for such action?

   Thanks!

2. M by Moult on 12 Mar 2025 # +2 votes

   Short answer no. You cannot trigger or override another operator (especially built-in).

   There are way around it though, you can create your own operator and override the hotkey instead and place it in the menu next to the built-in function. Or you can check for certain things in a decorator. Or a depsgraph update handler. Or certain properties can be subscribed using the msgbus (like active object).

   That bug is probably erroneously marked as first time contributor because it's probably a bit trickier to know how to detect this state.

3. F by falken10vdl on 13 Mar 2025, edited 13 Mar 2025 #

   @Moult said:

   Short answer no. You cannot trigger or override another operator (especially built-in).

   There are way around it though, you can create your own operator and override the hotkey instead and place it in the menu next to the built-in function. Or you can check for certain things in a decorator. Or a depsgraph update handler. Or certain properties can be subscribed using the msgbus (like active object).

   That bug is probably erroneously marked as first time contributor because it's probably a bit trickier to know how to detect this state.

   Understood. I have taken a look to some examples within the Bonsai source code and come up with something to create the operator.

   I have filled a PR for it ( If local view is toggled, that it turns off grid decorations. #6257 #6335 ). I do not know if these are the right places:

   • Operator class under src/bonsai/bonsai/bim/operator.py

   • A menu entry in src/bonsai/bonsai/bim/ui.py below the BIM_PT_snappping(Panel):

   • Registration/unregistration of the new operator under src/bonsai/bonsai/bim/init.py. (overriding the hotkey as you suggested)

   "

   As a side effect, if nothing is selected the shortcut provides a fast way to toggle the grid decorations on/off

4. M by Moult on 13 Mar 2025 #

   What if you just detect local view https://blender.stackexchange.com/questions/51854/how-can-i-detect-global-local-view-via-python in the grid decorator?

   I'm also wondering whether it even is a good idea to hide grids in local view. What about other decorators, like solar analysis? Or georeferencing?

5. F by falken10vdl on 13 Mar 2025 #

   I agree, probably the operator view3d.localview_custom should not override the hotkey. In fact a hotkey to toggle the grid is just one click away from #6257 and probably a simple solution.

   Anyhow, thanks a lot for explaining the possibilities regarding operators and hotkeys!

6. G by Gorgious on 13 Mar 2025 # +1 votes

   Just to iterate I would not try to mess with operators, you should be able to know if a 3D viewport is in local view with https://docs.blender.org/api/current/bpy.types.SpaceView3D.html#bpy.types.SpaceView3D.local_view

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