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d810c7ddbb
The extruder manager was too late to catch the initial global stack switch and machine switch. Now it just always reloads the extruders at the beginning. Contributes to issues CURA-1278 and CURA-351.
78 lines
No EOL
4 KiB
Python
78 lines
No EOL
4 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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import UM.Application #To get the global container stack to find the current machine.
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import UM.Logger
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import UM.Settings.ContainerRegistry #Finding containers by ID.
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import UM.Signal #To notify other components of changes in the extruders.
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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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## Signal to notify other components when the list of extruders changes.
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extrudersChanged = UM.Signal()
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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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self._next_item = 0 #For when you use this class as iterator.
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UM.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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self._reconnectExtruderReload()
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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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## Creates an iterator over the extruders in this manager.
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#
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# \return An iterator over the extruders in this manager.
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def __iter__(self):
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return iter(self._extruders)
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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 = UM.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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self._reloadExtruders()
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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, *args):
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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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self.extrudersChanged.emit() #Yes, we just cleared the _extruders list!
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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.getMetaDataEntry("machine_extruder_trains")
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for _,extruder_train_id in extruder_train_ids.items():
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extruder_definitions = UM.Settings.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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UM.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))
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self.extrudersChanged.emit() |