CURA-1615 - Updating for API 3

This updates the firmware updater to use the new MachineManagerModel

Additionally renamed "machine_type" to "machine_id", which makes it more
selfexplaining, when reading the code.

My printers firmware is not available here and has no heated bed, so
please test this commit!

cura/MachineManagerModel.py

@@ -485,6 +485,13 @@ class MachineManagerModel(QObject):
 
         return False
 
+    @pyqtProperty(bool, notify = globalContainerChanged)
+    def hasHeatedBed(self):
+        if self._active_container_stack:
+            return bool(self._global_container_stack.getMetaDataEntry("machine_heated_bed", False))
+
+        return False
+
     @pyqtProperty(bool, notify = globalContainerChanged)
     def hasVariants(self):
         if self._active_container_stack:

plugins/USBPrinting/USBPrinterOutputDeviceManager.py

@@ -13,6 +13,7 @@ from UM.Qt.ListModel import ListModel
 from UM.Message import Message
 
 from cura.CuraApplication import CuraApplication
+from cura.MachineManagerModel import MachineManagerModel
 
 import threading
 import platform
@@ -128,8 +129,9 @@ class USBPrinterOutputDeviceManager(QObject, SignalEmitter, OutputDevicePlugin,
         return USBPrinterOutputDeviceManager._instance
 
     def _getDefaultFirmwareName(self):
-        machine_instance = Application.getInstance().getMachineManager().getActiveMachineInstance()
-        machine_type = machine_instance.getMachineDefinition().getId()
+        machine_manager_model = MachineManagerModel()
+        machine_id = machine_manager_model.activeDefinitionId
+
         if platform.system() == "Linux":
             baudrate = 115200
         else:
@@ -151,23 +153,22 @@ class USBPrinterOutputDeviceManager(QObject, SignalEmitter, OutputDevicePlugin,
                                    }
         machine_with_heated_bed = {"ultimaker_original"       : "MarlinUltimaker-HBK-{baudrate}.hex",
                                    }
-
         ##TODO: Add check for multiple extruders
         hex_file = None
-        if machine_type in machine_without_extras.keys():  # The machine needs to be defined here!
-            if machine_type in machine_with_heated_bed.keys() and machine_instance.getMachineSettingValue("machine_heated_bed"):
+        if machine_id in machine_without_extras.keys():  # The machine needs to be defined here!
+            if machine_id in machine_with_heated_bed.keys() and machine_manager_model.hasHeatedBed:
                 Logger.log("d", "Choosing firmware with heated bed enabled for machine %s.", machine_type)
-                hex_file = machine_with_heated_bed[machine_type]  # Return firmware with heated bed enabled
+                hex_file = machine_with_heated_bed[machine_id]  # Return firmware with heated bed enabled
             else:
-                Logger.log("d", "Choosing basic firmware for machine %s.", machine_type)
-                hex_file = machine_without_extras[machine_type]  # Return "basic" firmware
+                Logger.log("d", "Choosing basic firmware for machine %s.", machine_id)
+                hex_file = machine_without_extras[machine_id]  # Return "basic" firmware
         else:
-            Logger.log("e", "There is no firmware for machine %s.", machine_type)
+            Logger.log("e", "There is no firmware for machine %s.", machine_id)
 
         if hex_file:
             return hex_file.format(baudrate=baudrate)
         else:
-            Logger.log("e", "Could not find any firmware for machine %s.", machine_type)
+            Logger.log("e", "Could not find any firmware for machine %s.", machine_id)
             raise FileNotFoundError()
 
     ##  Helper to identify serial ports (and scan for them)

plugins/USBPrinting/__init__.py

@@ -13,7 +13,7 @@ def getMetaData():
             "name": i18n_catalog.i18nc("@label", "USB printing"),
             "author": "Ultimaker",
             "version": "1.0",
-            "api": 2,
+            "api": 3,
             "description": i18n_catalog.i18nc("@info:whatsthis","Accepts G-Code and sends them to a printer. Plugin can also update firmware.")
         }
     }