WIP: Add custom CameraView for UM camera feed

CURA-5821

cura/CuraApplication.py

@@ -959,6 +959,9 @@ class CuraApplication(QtApplication):
         qmlRegisterType(QualityManagementModel, "Cura", 1, 0, "QualityManagementModel")
         qmlRegisterType(MachineManagementModel, "Cura", 1, 0, "MachineManagementModel")
 
+        from cura.PrinterOutput.CameraView import CameraView
+        qmlRegisterType(CameraView, "Cura", 1, 0, "CameraView")
+
         qmlRegisterSingletonType(QualityProfilesDropDownMenuModel, "Cura", 1, 0,
                                  "QualityProfilesDropDownMenuModel", self.getQualityProfilesDropDownMenuModel)
         qmlRegisterSingletonType(CustomQualityProfilesDropDownMenuModel, "Cura", 1, 0,

cura/PrinterOutput/CameraView.py

@@ -0,0 +1,41 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from PyQt5.QtCore import pyqtProperty, pyqtSignal
+from PyQt5.QtGui import QImage
+from PyQt5.QtQuick import QQuickPaintedItem
+
+
+#
+# A custom camera view that uses QQuickPaintedItem to present (or "paint") the image frames from a printer's
+# network camera feed.
+#
+class CameraView(QQuickPaintedItem):
+
+    def __init__(self, *args, **kwargs) -> None:
+        super().__init__(*args, **kwargs)
+
+        self._image = QImage()
+
+    imageChanged = pyqtSignal()
+
+    def setImage(self, image: "QImage") -> None:
+        self._image = image
+        self.imageChanged.emit()
+        self.update()
+
+    def getImage(self) -> "QImage":
+        return self._image
+
+    image = pyqtProperty(QImage, fget = getImage, fset = setImage, notify = imageChanged)
+
+    @pyqtProperty(int, notify = imageChanged)
+    def imageWidth(self) -> int:
+        return self._image.width()
+
+    @pyqtProperty(int, notify = imageChanged)
+    def imageHeight(self) -> int:
+        return self._image.height()
+
+    def paint(self, painter):
+        painter.drawImage(self.contentsBoundingRect(), self._image)