CURA-4870 Create an extruder configuration model to store the extruder configuration.

Connect the signals coming from the printer to correctly update the UI

cura/PrinterOutput/ExtruderConfigurationModel.py

@@ -0,0 +1,42 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from PyQt5.QtCore import pyqtProperty, QObject, pyqtSignal
+
+
+class ExtruderConfigurationModel(QObject):
+
+    extruderConfigurationChanged = pyqtSignal()
+
+    def __init__(self):
+        super().__init__()
+        self._position = -1
+        self._material = None
+        self._hotend_id = None
+
+    def setPosition(self, position):
+        self._position = position
+
+    @pyqtProperty(int, fset = setPosition, notify = extruderConfigurationChanged)
+    def position(self):
+        return self._position
+
+    def setMaterial(self, material):
+        self._material = material
+
+    @pyqtProperty(str, fset = setMaterial, notify = extruderConfigurationChanged)
+    def material(self):
+        return self._material
+
+    def setHotendID(self, hotend_id):
+        self._hotend_id = hotend_id
+
+    @pyqtProperty(str, fset = setHotendID, notify = extruderConfigurationChanged)
+    def hotendID(self):
+        return self._hotend_id
+
+    def __eq__(self, other):
+        return hash(self) == hash(other)
+
+    def __hash__(self):
+        return hash(self.position) ^ hash(self.material) ^ hash(self.hotendID)