fix: Reduce import time of the library

doc/changelog.d/179.fixed.md

@@ -0,0 +1 @@
+fix: Reduce import time of the library

src/ansys/tools/visualization_interface/backends/pyvista/pyvista.py

@@ -21,9 +21,9 @@
 # SOFTWARE.
 """Provides a wrapper to aid in plotting."""
 from abc import abstractmethod
+import importlib.util
 
-from beartype.typing import Any, Dict, List, Optional, Union
-import numpy as np
+from beartype.typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
 import pyvista as pv
 from vtkmodules.vtkCommonCore import vtkCommand
 from vtkmodules.vtkInteractionWidgets import vtkHoverWidget
@@ -32,10 +32,6 @@
 import ansys.tools.visualization_interface
 from ansys.tools.visualization_interface.backends._base import BaseBackend
 from ansys.tools.visualization_interface.backends.pyvista.pyvista_interface import PyVistaInterface
-from ansys.tools.visualization_interface.backends.pyvista.trame_local import (
-    _HAS_TRAME,
-    TrameVisualizer,
-)
 from ansys.tools.visualization_interface.backends.pyvista.widgets.displace_arrows import (
     CameraPanDirection,
     DisplacementArrow,
@@ -57,6 +53,11 @@
 from ansys.tools.visualization_interface.utils.color import Color
 from ansys.tools.visualization_interface.utils.logger import logger
 
+_HAS_TRAME = importlib.util.find_spec("pyvista.trame") and importlib.util.find_spec("trame.app")
+
+if TYPE_CHECKING:
+    import numpy as np
+
 
 class PyVistaBackendInterface(BaseBackend):
     """Provides the interface for the Visualization Interface Tool plotter.
@@ -193,7 +194,7 @@ def add_widget(self, widget: Union[PlotterWidget, List[PlotterWidget]]):
             self._widgets.append(widget)
             widget.update()
 
-    def select_object(self, custom_object: Union[MeshObjectPlot, EdgePlot], pt: np.ndarray) -> None:
+    def select_object(self, custom_object: Union[MeshObjectPlot, EdgePlot], pt: "np.ndarray") -> None:
         """Select a custom object in the plotter.
 
         This method highlights the edges of a body and adds a label. It also adds
@@ -463,6 +464,9 @@ def show_plotter(self, screenshot: Optional[str] = None) -> None:
 
         """
         if self._use_trame and _HAS_TRAME:
+            from ansys.tools.visualization_interface.backends.pyvista.trame_local import (
+                TrameVisualizer,
+            )
             visualizer = TrameVisualizer()
             visualizer.set_scene(self._pl)
             visualizer.show()

src/ansys/tools/visualization_interface/backends/pyvista/trame_local.py

@@ -20,6 +20,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 """Provides `trame <https://kitware.github.io/trame/index.html>`_ visualizer interface for visualization."""
+
 try:
     from pyvista.trame.ui import plotter_ui
     from trame.app import get_server