Plugin help: How to detect when print setting change?

[bradk3 14]

Hi, everybody! 

 

I'm working on a Cura plugin that needs to be able to detect when a change has been made to the print settings (in particular, Layer Height).  I've looked around and can't seem to find the event to attach to.  Does anyone know off-hand how I could do this?

[ahoeben 1,968]

I think you are looking for the "propertyChanged" signal of the "global stack".  To connect to it, you first need to connect to the "globalContainerChanged" signal of the machine manager. So something like this (untested code, there may be typos):

    def __init__(self, parent: Optional[QObject] = None) -> None:
        (...)
        self._global_stack = None  # type: Optional[GlobalStack]
        machine_manager = cura.CuraApplication.CuraApplication.getInstance().getMachineManager()

        # Reconnect all signals when the active machine gets changed.
        machine_manager.globalContainerChanged.connect(self._onMachineChanged)
        (...)

    def _onMachineChanged(self) -> None:
        if self._global_stack:
            self._global_stack.propertyChanged.disconnect(self._onPropertyValueChanged)

        self._global_stack = self._machine_manager.activeMachine

        if self._global_stack:
            self._global_stack.propertyChanged.connect(self._onPropertyValueChanged)

    def _onPropertyValueChanged(self, key: str, property_name: str) -> None:
        if key == "layer_height":
            Logger.log("d", "Layer Height changed")

 

Edited December 19, 2021 by ahoeben

[bradk3 14]

Thank you!  I sort of found the right callback, but had to do some work-arounds because I didn't know about the need to connect to the globalContainerChanged callback.

 

Thank you for taking the time to explain that.  This is exactly what I needed.