Added controller for USB printer

CL-541

plugins/USBPrinting/USBPrinterOutputController.py

@@ -0,0 +1,57 @@
+# Copyright (c) 2017 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from cura.PrinterOutput.PrinterOutputController import PrinterOutputController
+from PyQt5.QtCore import QTimer
+
+MYPY = False
+if MYPY:
+    from cura.PrinterOutput.PrintJobOutputModel import PrintJobOutputModel
+    from cura.PrinterOutput.PrinterOutputModel import PrinterOutputModel
+
+
+class USBPrinterOuptutController(PrinterOutputController):
+    def __init__(self, output_device):
+        super().__init__(output_device)
+
+        self._preheat_bed_timer = QTimer()
+        self._preheat_bed_timer.setSingleShot(True)
+        self._preheat_bed_timer.timeout.connect(self._onPreheatBedTimerFinished)
+        self._preheat_printer = None
+
+    def moveHead(self, printer: "PrinterOutputModel", x, y, z, speed):
+        self._output_device.sendCommand("G91")
+        self._output_device.sendCommand("G0 X%s Y%s Z%s F%s" % (x, y, z, speed))
+        self._output_device.sendCommand("G90")
+
+    def homeHead(self, printer):
+        self._output_device.sendCommand("G28 X")
+        self._output_device.sendCommand("G28 Y")
+
+    def homeBed(self, printer):
+        self._output_device.sendCommand("G28 Z")
+
+    def preheatBed(self, printer: "PrinterOutputModel", temperature, duration):
+        try:
+            temperature = round(temperature)  # The API doesn't allow floating point.
+            duration = round(duration)
+        except ValueError:
+            return  # Got invalid values, can't pre-heat.
+
+        self.setTargetBedTemperature(printer, temperature=temperature)
+        self._preheat_bed_timer.setInterval(duration * 1000)
+        self._preheat_bed_timer.start()
+        self._preheat_printer = printer
+        printer.updateIsPreheating(True)
+
+    def cancelPreheatBed(self, printer: "PrinterOutputModel"):
+        self.preheatBed(printer, temperature=0, duration=0)
+        self._preheat_bed_timer.stop()
+        printer.updateIsPreheating(False)
+
+    def setTargetBedTemperature(self, printer: "PrinterOutputModel", temperature: int):
+        self._output_device.sendCommand("M140 S%s" % temperature)
+
+    def _onPreheatBedTimerFinished(self):
+        self.setTargetBedTemperature(self._preheat_printer, 0)
+        self._preheat_printer.updateIsPreheating(False)