feat(abstract_view): add access to displayable manager

- Add access to DM from abstract_view using either dm class name or class type

closes #67

Author: Thibault-Pelletier

tests/test_threed_view.py

@@ -1,7 +1,7 @@
 from itertools import product
 
 import pytest
-from slicer import vtkMRMLAbstractViewNode
+from slicer import vtkMRMLAbstractViewNode, vtkMRMLModelDisplayableManager
 
 
 def test_threed_view_can_render_mrml_models(a_threed_view, render_interactive):
@@ -122,3 +122,9 @@ def test_threed_view_can_set_layout_color(a_threed_view):
     a_threed_view.set_layout_color([60, 60, 60])
     a_threed_view.set_layout_color_from_string("red")
     assert a_threed_view._view_node.GetLayoutColor() == (1.0, 0.0, 0.0)
+
+
+@pytest.mark.parametrize("dm_class", ["vtkMRMLModelDisplayableManager", vtkMRMLModelDisplayableManager])
+def test_view_provide_access_to_their_displayable_manager(a_threed_view, dm_class):
+    displayable_manager = a_threed_view.get_displayable_manager_by_class(dm_class)
+    assert isinstance(displayable_manager, vtkMRMLModelDisplayableManager)

trame_slicer/views/abstract_view.py

@@ -365,3 +365,10 @@ def _on_object_event(self, _obj: vtkObject, _event_id: int, _call_data: Any | No
 
     def get_view_node(self) -> vtkMRMLViewNode | None:
         return self._view_node
+
+    def get_displayable_manager_by_class(
+        self, dm_class: str | type[vtkMRMLAbstractDisplayableManager]
+    ) -> vtkMRMLAbstractDisplayableManager | None:
+        if isinstance(dm_class, type):
+            dm_class = dm_class.__name__
+        return self._displayable_manager_group.GetDisplayableManagerByClassName(dm_class)