fix(widgets): handle registration and state delivery

[jourdain]

No description provided.

[jspanchu]

Posting stack trace of the crash that happens when uncommenting these lines in VtkLocal.js

// crash: sceneManager.unRegisterState(cid);
// crash: sceneManager.updateStatesFromObjects();

    at abort (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.mjs:688:40)
    at assert (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.mjs:456:3)
    at ___cxa_throw (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.mjs:1494:2)
    at vtkWasmSceneManager.wasm.std::__2::__throw_out_of_range[abi:ne180100](char const*) (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.wasm:wasm-function[959]:0x9b58d)
    at vtkWasmSceneManager.wasm.std::__2::map<std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>>, std::__2::set<vtkSmartPointer<vtkObjectBase>, std::__2::less<vtkSmartPointer<vtkObjectBase>>, std::__2::allocator<vtkSmartPointer<vtkObjectBase>>>, std::__2::less<std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>>>, std::__2::allocator<std::__2::pair<std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>> const, std::__2::set<vtkSmartPointer<vtkObjectBase>, std::__2::less<vtkSmartPointer<vtkObjectBase>>, std::__2::allocator<vtkSmartPointer<vtkObjectBase>>>>>>::at(std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>> const&) const (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.wasm:wasm-function[951]:0x9ab3d)
    at vtkWasmSceneManager.wasm.vtkObjectManager::UpdateStatesFromObjects() (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.wasm:wasm-function[950]:0x9a785)
    at vtkWasmSceneManager.wasm.(anonymous namespace)::updateStatesFromObjects() (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.wasm:wasm-function[276]:0x7ae17)
    at vtkWasmSceneManager.wasm.emscripten::internal::Invoker<void>::invoke(void (*)()) (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.wasm:wasm-function[294]:0x7bb77)
    at dynCall (http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.mjs:4893:34)
    at http://localhost:8080/__trame_vtklocal/wasm/9.3.20240626/vtkWasmSceneManager.mjs:4899:22

[jspanchu]

Fixed the crash in my development branch. The logs of cameraState.Position in console shows x,y,z that change as I rotate the view so I think it works.

Can you suggest how to catch this emission of the cameraState and apply it in python? I checked the protocol.py and vtklocal.py just in case, nothing seems obvious.

[jourdain]

state.camera = None

VtkLocal(rw, camera="camera = $event")


@state.change("camera"):
def on_camera_change(camera,  **_):
    print("camera state available", camera)

[jspanchu]

Thanks! also had to do a small change in LocalView.__init__

--- a/trame_vtklocal/widgets/vtklocal.py
+++ b/trame_vtklocal/widgets/vtklocal.py
@@ -75,6 +75,7 @@ class LocalView(HtmlElement):
             "updated",
             ("memory_vtk", "memory-vtk"),
             ("memory_arrays", "memory-arrays"),
+            ("camera", "camera"),
         ]