Merge pull request #61 from Kitware/cpp-example

Fix import error in C++ example

Author: jspanchu

README.rst

@@ -82,7 +82,7 @@ Optionally, you can develop with bleeding edge VTK by following these steps. Mak
 3. Ninja
 4. Python
 5. NodeJS >= 24.0.1: https://nodejs.org/en/download/package-manager
-6. Emscripten SDK version 4.0.10: See https://emscripten.org/docs/getting_started/downloads.html#download-and-install
+6. Emscripten SDK version 4.0.20: See https://emscripten.org/docs/getting_started/downloads.html#download-and-install
 
 .. code-block:: console
 

examples/cpp/highlight_picked_actor.py

@@ -2,14 +2,27 @@
 import vtk
 from addonModules.addonStyle import (
     HighlightPickedActorStyle,
-    RegisterClasses_addonStyle,
 )  # type: ignore
 
 from trame.app import get_server
 from trame.ui.html import DivLayout
 from trame.widgets import html, client, vtklocal
 from trame.decorators import TrameApp
 
+VTK_VERSION = vtk.vtkVersion()
+# needed for vtk < 9.5.20250920
+MANUAL_SERDES_REGISTRATION_NEEDED = (
+    VTK_VERSION.GetVTKMajorVersion() <= 9
+    and VTK_VERSION.GetVTKMinorVersion() <= 5
+    and VTK_VERSION.GetVTKBuildVersion() < 20250920
+)  # https://gitlab.kitware.com/vtk/vtk/-/merge_requests/12426
+
+addon_serdes_registrars = []
+if MANUAL_SERDES_REGISTRATION_NEEDED:
+    from addonModules.addonStyle import RegisterClasses_addonStyle  # noqa: E402
+
+    addon_serdes_registrars.append(RegisterClasses_addonStyle)
+
 FULL_SCREEN = "position:absolute; left:0; top:0; width:100vw; height:100vh;"
 TOP_RIGHT = "position: absolute; top: 1rem; right: 1rem; z-index: 10;"
 TOP_LEFT = "position: absolute; top: 1rem; left: 1rem; z-index: 10;"
@@ -110,7 +123,7 @@ def _build_ui(self):
             with html.Div(style=FULL_SCREEN):
                 with vtklocal.LocalView(
                     self.render_window,
-                    addon_serdes_registrars=[RegisterClasses_addonStyle],
+                    addon_serdes_registrars=addon_serdes_registrars,
                     wasm_dir=WASM_DIR,
                     wasm_base_name=WASM_BASE_NAME,
                 ) as view: