Added CameraImageProvider & camera handling

CURA-1036 and CURA-338

cura/CameraImageProvider.py

@@ -0,0 +1,18 @@
+from PyQt5.QtGui import QImage
+from PyQt5.QtQuick import QQuickImageProvider
+from PyQt5.QtCore import QSize
+
+from UM.Application import Application
+
+class CameraImageProvider(QQuickImageProvider):
+    def __init__(self):
+        QQuickImageProvider.__init__(self, QQuickImageProvider.Image)
+
+    ##  Request a new image.
+    def requestImage(self, id, size):
+        for output_device in Application.getInstance().getOutputDeviceManager().getOutputDevices():
+            try:
+                return output_device.getCameraImage(), QSize(15, 15)
+            except AttributeError:
+                pass
+        return QImage(), QSize(15, 15)

cura/CuraApplication.py

@@ -43,6 +43,7 @@ from . import ZOffsetDecorator
 from . import CuraSplashScreen
 from . import MachineManagerModel
 from . import ContainerSettingsModel
+from . import CameraImageProvider
 
 from PyQt5.QtCore import pyqtSlot, QUrl, pyqtSignal, pyqtProperty, QEvent, Q_ENUMS
 from PyQt5.QtGui import QColor, QIcon
@@ -222,7 +223,7 @@ class CuraApplication(QtApplication):
         JobQueue.getInstance().jobFinished.connect(self._onJobFinished)
 
         self.applicationShuttingDown.connect(self.saveSettings)
-
+        self.engineCreatedSignal.connect(self._onEngineCreated)
         self._recent_files = []
         files = Preferences.getInstance().getValue("cura/recent_files").split(";")
         for f in files:
@@ -231,6 +232,9 @@ class CuraApplication(QtApplication):
 
             self._recent_files.append(QUrl.fromLocalFile(f))
 
+    def _onEngineCreated(self):
+        self._engine.addImageProvider("camera", CameraImageProvider.CameraImageProvider())
+
     ##  Cura has multiple locations where instance containers need to be saved, so we need to handle this differently.
     #
     #   Note that the AutoSave plugin also calls this method.

resources/qml/Sidebar.qml

@@ -281,8 +281,6 @@ Rectangle
             text: " " + Cura.MachineManager.printerOutputDevices[0].bedTemperature
         }
 
-
-
         // Spacers
         Label { text: " "}
         Label { text: " "}