Move busy handling into LayerPass and cleanup

CURA-1601

plugins/LayerView/LayerPass.py

@@ -30,8 +30,6 @@ class LayerPass(RenderPass):
         self._gl = OpenGL.getInstance().getBindingsObject()
         self._scene = self._controller.getScene()
 
-        self._layer_view = None
-
         self._controller.getScene().getRoot().childrenChanged.connect(self._onSceneChanged)
         self._max_layers = 0
         self._current_layer_num = 0
@@ -41,6 +39,8 @@ class LayerPass(RenderPass):
         self._activity = False
         self._old_max_layers = 0
 
+        self._busy = False
+
         Preferences.getInstance().addPreference("view/top_layer_count", 5)
         Preferences.getInstance().addPreference("view/only_show_top_layers", False)
         Preferences.getInstance().preferenceChanged.connect(self._onPreferencesChanged)
@@ -48,8 +48,15 @@ class LayerPass(RenderPass):
         self._solid_layers = int(Preferences.getInstance().getValue("view/top_layer_count"))
         self._only_show_top_layers = bool(Preferences.getInstance().getValue("view/only_show_top_layers"))
 
-    def setLayerView(self, layerview):
-        self._layer_view = layerview
+    busyChanged = Signal()
+
+    def isBusy(self):
+        return self._busy
+
+    def setBusy(self, busy):
+        if busy != self._busy:
+            self._busy = busy
+            self.busyChanged.emit()
 
     def getActivity(self):
         return self._activity
@@ -175,14 +182,14 @@ class LayerPass(RenderPass):
             self._top_layers_job.finished.disconnect(self._updateCurrentLayerMesh)
             self._top_layers_job.cancel()
 
-        self._layer_view.setBusy(True)
+        self.setBusy(True)
 
         self._top_layers_job = _CreateTopLayersJob(self._controller.getScene(), self._current_layer_num, self._solid_layers)
         self._top_layers_job.finished.connect(self._updateCurrentLayerMesh)
         self._top_layers_job.start()
 
     def _updateCurrentLayerMesh(self, job):
-        self._layer_view.setBusy(False)
+        self.setBusy(False)
 
         if not job.getResult():
             return

plugins/LayerView/LayerView.py

@@ -6,7 +6,6 @@ from UM.View.View import View
 from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator
 from UM.Resources import Resources
 from UM.Event import Event, KeyEvent
-from UM.Signal import Signal
 from UM.Scene.Selection import Selection
 from UM.Math.Color import Color
 from UM.Scene.SceneNode import SceneNode
@@ -39,20 +38,19 @@ class LayerView(View):
         self._layerview_composite_shader = None
         self._old_composite_shader = None
 
-        self._busy = False
-
     def getLayerPass(self):
+        if not self._layer_pass:
+            # Currently the RenderPass constructor requires a size > 0
+            # This should be fixed in RenderPass's constructor.
+            self._layer_pass = LayerPass.LayerPass(1, 1)
+            self.getRenderer().addRenderPass(self._layer_pass)
+
         return self._layer_pass
 
-    busyChanged = Signal()
-
-    def isBusy(self):
-        return self._busy
-
-    def setBusy(self, busy):
-        if busy != self._busy:
-            self._busy = busy
-            self.busyChanged.emit()
+    ##  Hackish way to ensure the proxy is already created, which ensures that the layerview.qml is already created
+    #   as this caused some issues.
+    def getProxy(self, engine, script_engine):
+        return self._proxy
 
     def beginRendering(self):
         scene = self.getController().getScene()
@@ -72,11 +70,6 @@ class LayerView(View):
                 if node.getMeshData() and node.isVisible():
                     renderer.queueNode(node, transparent = True, shader = self._ghost_shader)
 
-    ##  Hackish way to ensure the proxy is already created, which ensures that the layerview.qml is already created
-    #   as this caused some issues. 
-    def getProxy(self, engine, script_engine):
-        return self._proxy
-
     def endRendering(self):
         pass
 
@@ -85,19 +78,15 @@ class LayerView(View):
         ctrl_is_active = modifiers == Qt.ControlModifier
         if event.type == Event.KeyPressEvent and ctrl_is_active:
             if event.key == KeyEvent.UpKey:
-                self._layer_pass.setLayer(self._current_layer_num + 1)
+                self.getLayerPass().setLayer(self._current_layer_num + 1)
                 return True
             if event.key == KeyEvent.DownKey:
-                self._layer_pass.setLayer(self._current_layer_num - 1)
+                self.getLayerPass().setLayer(self._current_layer_num - 1)
                 return True
 
         if event.type == Event.ViewActivateEvent:
-            if not self._layer_pass:
-                # Currently the RenderPass constructor requires a size > 0
-                # This should be fixed in RenderPass's constructor.
-                self._layer_pass = LayerPass.LayerPass(1, 1)
-                self._layer_pass.setLayerView(self)
-                self.getRenderer().addRenderPass(self._layer_pass)
+            # Make sure the LayerPass is created
+            self.getLayerPass()
 
             if not self._layerview_composite_shader:
                 self._layerview_composite_shader = OpenGL.getInstance().createShaderProgram(os.path.join(PluginRegistry.getInstance().getPluginPath("LayerView"), "layerview_composite.shader"))

plugins/LayerView/LayerViewProxy.py

@@ -39,7 +39,7 @@ class LayerViewProxy(QObject):
     def busy(self):
         active_view = self._controller.getActiveView()
         if type(active_view) == LayerView.LayerView.LayerView:
-            return active_view.isBusy()
+            return active_view.getLayerPass().isBusy()
 
         return False
     
@@ -67,4 +67,4 @@ class LayerViewProxy(QObject):
         if type(active_view) == LayerView.LayerView.LayerView:
             active_view.getLayerPass().currentLayerNumChanged.connect(self._onLayerChanged)
             active_view.getLayerPass().maxLayersChanged.connect(self._onMaxLayersChanged)
-            active_view.busyChanged.connect(self._onBusyChanged)
+            active_view.getLayerPass().busyChanged.connect(self._onBusyChanged)