Tightended up the signals associated with the extruders. Bug fixed.

CURA-1585 Profile dropdown options non functional.

cura/Settings/ExtruderManager.py

@@ -23,7 +23,8 @@ class ExtruderManager(QObject):
         super().__init__(parent)
         self._extruder_trains = { } #Per machine, a dictionary of extruder container stack IDs.
         self._active_extruder_index = -1
-        UM.Application.getInstance().globalContainerStackChanged.connect(self._addCurrentMachineExtruders)
+        UM.Application.getInstance().globalContainerStackChanged.connect(self.__globalContainerStackChanged)
+        self._addCurrentMachineExtruders()
 
     ##  Gets the unique identifier of the currently active extruder stack.
     #
@@ -78,20 +79,21 @@ class ExtruderManager(QObject):
                 if global_definition_container.getId() in self._extruder_trains:
                     if str(self._active_extruder_index) in self._extruder_trains[global_definition_container.getId()]:
                         return self._extruder_trains[global_definition_container.getId()][str(self._active_extruder_index)]
-
+        return None
 
     ##  Adds all extruders of a specific machine definition to the extruder
     #   manager.
     #
     #   \param machine_definition The machine to add the extruders for.
     def addMachineExtruders(self, machine_definition):
+        changed = False
         machine_id = machine_definition.getId()
         if machine_id not in self._extruder_trains:
             self._extruder_trains[machine_id] = { }
+            changed = True
 
         container_registry = UM.Settings.ContainerRegistry.getInstance()
-        if not container_registry: #Then we shouldn't have any machine definition either. In any case, there are no extruder trains then so bye bye.
-            return
+        if container_registry:
 
             #Add the extruder trains that don't exist yet.
             for extruder_definition in container_registry.findDefinitionContainers(machine = machine_definition.getId()):
@@ -100,6 +102,7 @@ class ExtruderManager(QObject):
                     UM.Logger.log("w", "Extruder definition %s specifies no position metadata entry.", extruder_definition.getId())
                 if not container_registry.findContainerStacks(machine = machine_id, position = position): #Doesn't exist yet.
                     self.createExtruderTrain(extruder_definition, machine_definition, position)
+                    changed = True
 
             #Gets the extruder trains that we just created as well as any that still existed.
             extruder_trains = container_registry.findContainerStacks(type = "extruder_train", machine = machine_definition.getId())
@@ -108,8 +111,9 @@ class ExtruderManager(QObject):
 
                 #Ensure that the extruder train stacks are linked to global stack.
                 extruder_train.setNextStack(UM.Application.getInstance().getGlobalContainerStack())
+                changed = True
 
-        if extruder_trains:
+        if changed:
             self.extrudersChanged.emit(machine_definition)
 
     ##  Creates a container stack for an extruder train.
@@ -227,6 +231,10 @@ class ExtruderManager(QObject):
         for name in self._extruder_trains[machine_id]:
             yield self._extruder_trains[machine_id][name]
 
+    def __globalContainerStackChanged(self):
+        self._addCurrentMachineExtruders()
+        self.activeExtruderChanged.emit()
+
     ##  Adds the extruders of the currently active machine.
     def _addCurrentMachineExtruders(self):
         global_stack = UM.Application.getInstance().getGlobalContainerStack()

cura/Settings/ExtrudersModel.py

@@ -52,7 +52,7 @@ class ExtrudersModel(UM.Qt.ListModel.ListModel):
         #Listen to changes.
         manager = ExtruderManager.getInstance()
         manager.extrudersChanged.connect(self._updateExtruders) #When the list of extruders changes in general.
-        UM.Application.getInstance().globalContainerStackChanged.connect(self._updateExtruders) #When the current machine changes.
+
         self._updateExtruders()
 
         manager.activeExtruderChanged.connect(self._onActiveExtruderChanged)
@@ -65,6 +65,7 @@ class ExtrudersModel(UM.Qt.ListModel.ListModel):
             self.addGlobalChanged.emit()
 
     addGlobalChanged = pyqtSignal()
+
     @pyqtProperty(bool, fset = setAddGlobal, notify = addGlobalChanged)
     def addGlobal(self):
         return self._add_global
@@ -93,12 +94,14 @@ class ExtrudersModel(UM.Qt.ListModel.ListModel):
     #
     #   This should be called whenever the list of extruders changes.
     def _updateExtruders(self):
-        self.clear()
-        manager = ExtruderManager.getInstance()
-        global_container_stack = UM.Application.getInstance().getGlobalContainerStack()
-        if not global_container_stack:
-            return #There is no machine to get the extruders of.
+        changed = False
 
+        if self.rowCount() != 0:
+            self.clear()
+            changed = True
+
+        global_container_stack = UM.Application.getInstance().getGlobalContainerStack()
+        if global_container_stack:
             if self._add_global:
                 material = global_container_stack.findContainer({ "type": "material" })
                 colour = material.getMetaDataEntry("color_code", default = self.defaultColours[0]) if material else self.defaultColours[0]
@@ -109,7 +112,9 @@ class ExtrudersModel(UM.Qt.ListModel.ListModel):
                     "index": -1
                 }
                 self.appendItem(item)
+                changed = True
 
+            manager = ExtruderManager.getInstance()
             for extruder in manager.getMachineExtruders(global_container_stack.getBottom().getId()):
                 extruder_name = extruder.getName()
                 material = extruder.findContainer({ "type": "material" })
@@ -120,7 +125,7 @@ class ExtrudersModel(UM.Qt.ListModel.ListModel):
                     position = int(position)
                 except ValueError: #Not a proper int.
                     position = -1
-            default_colour = self.defaultColours[position] if position >= 0 and position < len(self.defaultColours) else defaultColours[0]
+                default_colour = self.defaultColours[position] if position >= 0 and position < len(self.defaultColours) else self.defaultColours[0]
                 colour = material.getMetaDataEntry("color_code", default = default_colour) if material else default_colour
                 item = { #Construct an item with only the relevant information.
                     "id": extruder.getId(),
@@ -129,6 +134,8 @@ class ExtrudersModel(UM.Qt.ListModel.ListModel):
                     "index": position
                 }
                 self.appendItem(item)
+                changed = True
 
+        if changed:
             self.sort(lambda item: item["index"])
             self.modelChanged.emit()

cura/Settings/MachineManager.py

@@ -11,7 +11,6 @@ from UM.Logger import Logger
 import UM.Settings
 
 from cura.PrinterOutputDevice import PrinterOutputDevice
-
 from . import ExtruderManager
 
 from UM.i18n import i18nCatalog
@@ -31,7 +30,6 @@ class MachineManager(QObject):
         self._onGlobalContainerChanged()
 
         ExtruderManager.getInstance().activeExtruderChanged.connect(self._onActiveExtruderStackChanged)
-        self.globalContainerChanged.connect(self._onActiveExtruderStackChanged)
         self._onActiveExtruderStackChanged()
 
         ##  When the global container is changed, active material probably needs to be updated.