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This way we don't need to load it in CuraApplication but we can just load it whenever it is first needed. ExtruderManager should be robust against initialising it at any point in Cura's runtime. Contributes to issues CURA-1278 and CURA-351.
63 lines
No EOL
3.3 KiB
Python
63 lines
No EOL
3.3 KiB
Python
# Copyright (c) 2016 Ultimaker B.V.
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# Cura is released under the terms of the AGPLv3 or higher.
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from cura.Extruder import Extruder #The individual extruders managed by this manager.
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from UM.Application import Application #To get the global container stack to find the current machine.
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from UM.Logger import Logger
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from UM.Settings.ContainerRegistry import ContainerRegistry #Finding containers by ID.
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## Class that handles the current extruder stack.
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#
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# This finds the extruders that are available for the currently active machine
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# and makes sure that whenever the machine is swapped, this list is kept up to
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# date. It also contains and updates the setting stacks for the extruders.
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class ExtruderManager:
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## The singleton instance of this manager.
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__instance = None
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## Registers listeners and such to listen to changes to the extruders.
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def __init__(self):
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self._extruders = [] #Extruders for the current machine.
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self._global_container_stack = None
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Application.getInstance().globalContainerStackChanged.connect(self._reconnectExtruderReload) #When the current machine changes, we need to reload all extruders belonging to the new machine.
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## Gets an instance of this extruder manager.
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#
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# If an instance was already created, the old instance is returned. This
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# implements the singleton pattern.
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@classmethod
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def getInstance(cls):
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if not cls.__instance:
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cls.__instance = ExtruderManager()
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return cls.__instance
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## When the global container stack changes, this reconnects to the new
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# signal for containers changing.
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def _reconnectExtruderReload(self):
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if self._global_container_stack:
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self._global_container_stack.containersChanged.disconnect(self._reloadExtruders) #Disconnect from the old global container stack.
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self._global_container_stack = Application.getInstance().getGlobalContainerStack()
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self._global_container_stack.containersChanged.connect(self._reloadExtruders) #When the current machine changes, we need to reload all extruders belonging to the new machine.
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## (Re)loads all extruders of the currently active machine.
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#
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# This looks at the global container stack to see which machine is active.
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# Then it loads the extruders for that machine and loads each of them in a
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# list of extruders.
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def _reloadExtruders(self):
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self._extruders = []
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if not self._global_container_stack: #No machine has been added yet.
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return #Then leave them empty!
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#Get the extruder definitions belonging to the current machine.
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machine = self._global_container_stack.getBottom()
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extruder_train_ids = machine.getMetaData("machine_extruder_trains")
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for extruder_train_id in extruder_train_ids:
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extruder_definitions = ContainerRegistry.getInstance().findDefinitionContainers(id = extruder_train_id) #Should be only 1 definition if IDs are unique, but add the whole list anyway.
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if not extruder_definitions: #Empty list or error.
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Logger.log("w", "Machine definition %s refers to an extruder train \"%s\", but no such extruder was found.", machine.getId(), extruder_train_id)
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continue
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for extruder_definition in extruder_definitions:
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self._extruders.append(Extruder(extruder_definition)) |