Merge branch '4.0' of github.com:Ultimaker/Cura

cura/GlobalStacksModel.py

@@ -1,12 +1,16 @@
 # Copyright (c) 2018 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
-from PyQt5.QtCore import Qt
 
 from UM.Qt.ListModel import ListModel
+
+from PyQt5.QtCore import pyqtProperty, Qt, QTimer
+
 from cura.PrinterOutputDevice import ConnectionType
 from cura.Settings.CuraContainerRegistry import CuraContainerRegistry
 
+from cura.Settings.GlobalStack import GlobalStack
+
 
 class GlobalStacksModel(ListModel):
     NameRole = Qt.UserRole + 1
@@ -23,20 +27,26 @@ class GlobalStacksModel(ListModel):
         self.addRoleName(self.MetaDataRole, "metadata")
         self._container_stacks = []
 
+        self._change_timer = QTimer()
+        self._change_timer.setInterval(200)
+        self._change_timer.setSingleShot(True)
+        self._change_timer.timeout.connect(self._update)
+
         # Listen to changes
         CuraContainerRegistry.getInstance().containerAdded.connect(self._onContainerChanged)
         CuraContainerRegistry.getInstance().containerMetaDataChanged.connect(self._onContainerChanged)
         CuraContainerRegistry.getInstance().containerRemoved.connect(self._onContainerChanged)
         self._filter_dict = {}
-        self._update()
+        self._updateDelayed()
 
     ##  Handler for container added/removed events from registry
     def _onContainerChanged(self, container):
-        from cura.Settings.GlobalStack import GlobalStack  # otherwise circular imports
-
         # We only need to update when the added / removed container GlobalStack
         if isinstance(container, GlobalStack):
-            self._update()
+            self._updateDelayed()
+
+    def _updateDelayed(self):
+        self._change_timer.start()
 
     def _update(self) -> None:
         items = []