Draft: Fix handling of coin nodes

Fixes #18523.

src/Mod/Draft/draftguitools/gui_subelements.py

@@ -37,9 +37,9 @@ import pivy.coin as coin
 from PySide.QtCore import QT_TRANSLATE_NOOP
 
 import FreeCADGui as Gui
-import draftguitools.gui_base_original as gui_base_original
-import draftguitools.gui_tool_utils as gui_tool_utils
-
+from draftguitools import gui_base_original
+from draftguitools import gui_tool_utils
+from draftutils import gui_utils
 from draftutils.messages import _msg
 from draftutils.translate import translate
 
@@ -124,20 +124,22 @@ class SubelementHighlight(gui_base_original.Modifier):
     def highlight_editable_objects(self):
         """Highlight editable Draft objects from the selection."""
         for obj in self.editable_objects:
+            vobj = obj.ViewObject
             self.original_view_settings[obj.Name] = {
-                'Visibility': obj.ViewObject.Visibility,
-                'PointSize': obj.ViewObject.PointSize,
-                'PointColor': obj.ViewObject.PointColor,
-                'LineColor': obj.ViewObject.LineColor}
-            obj.ViewObject.Visibility = True
-            obj.ViewObject.PointSize = 10
-            obj.ViewObject.PointColor = (1.0, 0.0, 0.0)
-            obj.ViewObject.LineColor = (1.0, 0.0, 0.0)
+                'Visibility': vobj.Visibility,
+                'PointSize': vobj.PointSize,
+                'PointColor': vobj.PointColor,
+                'LineColor': vobj.LineColor}
+            vobj.Visibility = True
+            vobj.PointSize = 10
+            vobj.PointColor = (1.0, 0.0, 0.0)
+            vobj.LineColor = (1.0, 0.0, 0.0)
             xray = coin.SoAnnotation()
-            if obj.ViewObject.RootNode.getNumChildren() > 2:
-                xray.addChild(obj.ViewObject.RootNode.getChild(2).getChild(0))
+            switch = gui_utils.find_coin_node(vobj.RootNode, coin.SoSwitch)
+            if switch is not None:
+                xray.addChild(switch.getChild(0))
                 xray.setName("xray")
-                obj.ViewObject.RootNode.addChild(xray)
+                vobj.RootNode.addChild(xray)
 
     def restore_editable_objects_graphics(self):
         """Restore the editable objects' appearance."""

src/Mod/Draft/draftguitools/gui_trackers.py

@@ -43,6 +43,7 @@ import FreeCADGui
 import Draft
 import DraftVecUtils
 from FreeCAD import Vector
+from draftutils import gui_utils
 from draftutils import params
 from draftutils import utils
 from draftutils.messages import _msg
@@ -775,13 +776,12 @@ class ghostTracker(Tracker):
         try:
             sep.addChild(obj.ViewObject.RootNode.copy())
             # add Part container offset
-            if hasattr(obj, "getGlobalPlacement"):
-                if obj.Placement != obj.getGlobalPlacement():
-                    if sep.getChild(0).getNumChildren() > 0:
-                        if isinstance(sep.getChild(0).getChild(0),coin.SoTransform):
-                            gpl = obj.getGlobalPlacement()
-                            sep.getChild(0).getChild(0).translation.setValue(tuple(gpl.Base))
-                            sep.getChild(0).getChild(0).rotation.setValue(gpl.Rotation.Q)
+            if hasattr(obj, "getGlobalPlacement") and obj.Placement != obj.getGlobalPlacement():
+                transform = gui_utils.find_coin_node(sep.getChild(0), coin.SoTransform)
+                if transform is not None:
+                    gpl = obj.getGlobalPlacement()
+                    transform.translation.setValue(tuple(gpl.Base))
+                    transform.rotation.setValue(gpl.Rotation.Q)
         except Exception:
             _msg("ghostTracker: Error retrieving coin node (full)")
         return sep

src/Mod/Draft/draftutils/gui_utils.py

@@ -896,6 +896,14 @@ def get_bbox(obj, debug=False):
     return App.BoundBox(xmin, ymin, zmin, xmax, ymax, zmax)
 
 
+# Code by Yorik van Havre.
+def find_coin_node(parent, nodetype):
+    for i in range(parent.getNumChildren()):
+        if isinstance(parent.getChild(i), nodetype):
+            return parent.getChild(i)
+    return None
+
+
 # Code by Chris Hennes (chennes).
 # See https://forum.freecadweb.org/viewtopic.php?p=656362#p656362.
 # Used to fix https://github.com/FreeCAD/FreeCAD/issues/10469.

src/Mod/Draft/draftviewproviders/view_base.py

@@ -289,11 +289,12 @@ class ViewProviderDraft(object):
                             else:
                                 path = "None"
                     if path and vobj.RootNode:
-                        if vobj.RootNode.getChildren().getLength() > 2:
-                            if vobj.RootNode.getChild(2).getChildren().getLength() > 0:
-                                innodes = vobj.RootNode.getChild(2).getChild(0).getChildren().getLength()
+                        switch = gui_utils.find_coin_node(vobj.RootNode, coin.SoSwitch)
+                        if switch is not None:
+                            if switch.getChildren().getLength() > 0:
+                                innodes = switch.getChild(0).getChildren().getLength()
                                 if  innodes > 2:
-                                    r = vobj.RootNode.getChild(2).getChild(0).getChild(innodes-1)
+                                    r = switch.getChild(0).getChild(innodes-1)
                                     i = QtCore.QFileInfo(path)
                                     if self.texture:
                                         r.removeChild(self.texture)