CURA-4557 setting up plugin

plugins/ModelChecker/ModelChecker.py

@@ -0,0 +1,38 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from PyQt5.QtCore import QTimer
+from cura.Scene.CuraSceneNode import CuraSceneNode
+
+from UM.Application import Application
+from UM.Extension import Extension
+from UM.Logger import Logger
+
+
+class ModelChecker(Extension):
+    def __init__(self):
+        super().__init__()
+
+        self._update_timer = QTimer()
+        self._update_timer.setInterval(2000)
+        self._update_timer.setSingleShot(True)
+        self._update_timer.timeout.connect(self.checkObjects)
+
+        self._nodes_to_check = set()
+
+        ## Reacting to an event. ##
+        Application.getInstance().mainWindowChanged.connect(self.logMessage) #When the main window is created, log a message.
+        Application.getInstance().getController().getScene().sceneChanged.connect(self._onSceneChanged)
+
+    ##  Adds a message to the log, as an example of how to listen to events.
+    def logMessage(self):
+        Logger.log("i", "This is an example log message. yeaaa")
+
+    def checkObjects(self):
+        Logger.log("d", "############# checking....")
+
+    def _onSceneChanged(self, source):
+        if isinstance(source, CuraSceneNode) and source.callDecoration("isSliceable"):
+            Logger.log("d", "triggurrrr")
+            self._nodes_to_check.add(source)
+            self._update_timer.start()