T466: Added pausing of backend work

plugins/CuraEngineBackend/CuraEngineBackend.py

@@ -69,6 +69,8 @@ class CuraEngineBackend(Backend):
         self._scene = Application.getInstance().getController().getScene()
         self._scene.sceneChanged.connect(self._onSceneChanged)
 
+        self._pauseSlicing = False
+
         # Workaround to disable layer view processing if layer view is not active.
         self._layer_view_active = False
         Application.getInstance().getController().activeViewChanged.connect(self._onActiveViewChanged)
@@ -399,7 +401,8 @@ class CuraEngineBackend(Backend):
     #
     #   This indicates that we should probably re-slice soon.
     def _onChanged(self, *args, **kwargs):
-        self._change_timer.start()
+        if not self._pauseSlicing:
+            self._change_timer.start()
 
     ##  Called when the back-end connects to the front-end.
     def _onBackendConnected(self):

plugins/GCODEReader/GCODEReader.py

@@ -48,6 +48,16 @@ class GCODEReader(MeshReader):
 
             scene_node.getBoundingBox = getBoundingBox
             scene_node.gcode = True
+            backend = Application.getInstance().getBackend()
+            backend._pauseSlicing = True
+            backend.backendStateChange.emit(0)
+
+            mesh_builder = MeshBuilder()
+            mesh_builder.setFileName(file_name)
+
+            mesh_builder.addCube(10,10,10)
+
+            scene_node.setMeshData(mesh_builder.build())
 
             layer_data = LayerDataBuilder.LayerDataBuilder()
             layer_count = 1

plugins/LayerView/LayerPass.py

@@ -45,16 +45,11 @@ class LayerPass(RenderPass):
         tool_handle_batch = RenderBatch(self._tool_handle_shader, type = RenderBatch.RenderType.Overlay)
 
         for node in DepthFirstIterator(self._scene.getRoot()):
-            flag = False
-            try:
-                flag = node.gcode
-            except AttributeError:
-                pass
 
             if isinstance(node, ToolHandle):
                 tool_handle_batch.addItem(node.getWorldTransformation(), mesh = node.getSolidMesh())
 
-            elif isinstance(node, SceneNode) and (node.getMeshData() or flag) and node.isVisible():
+            elif isinstance(node, SceneNode) and (node.getMeshData()) and node.isVisible():
                 layer_data = node.callDecoration("getLayerData")
                 if not layer_data:
                     continue

plugins/LayerView/LayerView.py

@@ -118,8 +118,14 @@ class LayerView(View):
             if type(node) is ConvexHullNode and not Selection.isSelected(node.getWatchedNode()):
                 continue
 
+            flag = False
+            try:
+                flag = node.gcode
+            except AttributeError:
+                pass
+
             if not node.render(renderer):
-                if node.getMeshData() and node.isVisible():
+                if node.getMeshData() and node.isVisible() and not flag:
                     renderer.queueNode(node, transparent = True, shader = self._ghost_shader)
 
     def setLayer(self, value):

resources/qml/SaveButton.qml

@@ -14,6 +14,7 @@ Rectangle {
 
     property real progress: UM.Backend.progress;
     property int backendState: UM.Backend.state;
+    property bool backendPaused: UM.Backend.paused;
     property bool activity: Printer.getPlatformActivity;
     property int totalHeight: childrenRect.height + UM.Theme.getSize("default_margin").height
     property string fileBaseName
@@ -24,6 +25,11 @@ Rectangle {
             return catalog.i18nc("@label:PrintjobStatus", "Please load a 3d model");
         }
 
+        if (backendPaused)
+        {
+            return catalog.i18nc("@label:PrintjobStatus", "Slicing temporary disabled");
+        }
+
         switch(base.backendState)
         {
             case 1: