widget: be more permissive in backend names

changelog.md

@@ -32,6 +32,7 @@
 * Ensure that operators such as (e.g. `+`, `-`, `/`) work on [`Slice`](https://lumicks-pylake.readthedocs.io/en/latest/_api/lumicks.pylake.channel.Slice.html) with all types that are convertible to scalars. Previously these failed with zero dimensional numpy arrays and other convertible objects.
 * Fixed a bug where bead edge determination could fail with an unhandled exception during background estimation. This raised a `np.linalg.LinAlgError` when determining the background failed rather than the expected `RuntimeError`. In this case, a simple median is used as a fallback option.
 * Fix a bug to ensure that [`lk.GaussianMixtureModel`](https://lumicks-pylake.readthedocs.io/en/latest/_api/lumicks.pylake.GaussianMixtureModel.html) can also be used with a single state.
+* Fixed bug that prevented opening the force distance widgets when using them with the `widget` backend on `matplotlib >= 3.9.0`.
 
 ## v1.5.3 | 2024-10-29
 

lumicks/pylake/nb_widgets/detail/shared.py

@@ -0,0 +1,16 @@
+def check_widget_backend():
+    import matplotlib.pyplot as plt
+
+    if not max(
+        # Note: Some, but not all versions of matplotlib lower the backend names. Hence, we
+        # always lower them to be on the safe side.
+        [backend in plt.get_backend().lower() for backend in ("nbagg", "ipympl", "widget")]
+    ):
+        raise RuntimeError(
+            (
+                "Please enable an interactive matplotlib backend for this widget to work. In "
+                "jupyter notebook or lab you can do this by invoking either "
+                "%matplotlib widget or %matplotlib ipympl. Please note that you may have to "
+                "restart the notebook kernel for this to work."
+            ),
+        )

lumicks/pylake/nb_widgets/kymotracker_widgets.py

@@ -10,6 +10,7 @@
 from lumicks.pylake.kymotracker.kymotrack import KymoTrackGroup, load_tracks
 from lumicks.pylake.kymotracker.kymotracker import track_greedy, _to_half_kernel_size
 from lumicks.pylake.nb_widgets.detail.mouse import MouseDragCallback
+from lumicks.pylake.nb_widgets.detail.shared import check_widget_backend
 from lumicks.pylake.nb_widgets.detail.undostack import UndoStack
 
 
@@ -435,19 +436,7 @@ def _create_widgets(self):
         import matplotlib.pyplot as plt
         from IPython.display import display
 
-        if not max(
-            # Note: Some, but not all versions of matplotlib lower the backend names. Hence, we
-            # always lower them to be on the safe side.
-            [backend in plt.get_backend().lower() for backend in ("nbagg", "ipympl", "widget")]
-        ):
-            raise RuntimeError(
-                (
-                    "Please enable an interactive matplotlib backend for this plot to work. In "
-                    "jupyter notebook or lab you can do this by invoking either "
-                    "%matplotlib widget or %matplotlib ipympl. Please note that you may have to "
-                    "restart the notebook kernel for this to work."
-                )
-            )
+        check_widget_backend()
 
         self._labels["status"] = ipywidgets.Label(value="")
         self._labels["warning"] = ipywidgets.HTML(value="")
@@ -543,7 +532,7 @@ def set_fn(value):
 
         display(ui)
 
-        if "ipympl" not in plt.get_backend():
+        if not any(backend in plt.get_backend().lower() for backend in ("ipympl", "widget")):
             # Without this, the figure doesn't show up on non ipympl backends
             with output:
                 display(self._fig)

lumicks/pylake/nb_widgets/range_selector.py

@@ -2,6 +2,8 @@
 
 import numpy as np
 
+from lumicks.pylake.nb_widgets.detail.shared import check_widget_backend
+
 
 class BaseRangeSelectorWidget:
     """Base class for range selection widgets.
@@ -270,15 +272,7 @@ def __init__(self, fd_curves):
                 "F,d selector widget cannot open without a non-empty dictionary containing F,d curves."
             )
 
-        if not any(backend in plt.get_backend() for backend in ("nbAgg", "ipympl")):
-            raise RuntimeError(
-                (
-                    "Please enable an interactive matplotlib backend for this plot to work. In "
-                    "jupyter notebook or lab you can do this by invoking either "
-                    "%matplotlib widget. Please note that you may have to restart the notebook "
-                    "kernel for this to work."
-                )
-            )
+        check_widget_backend()
 
         plt.figure()
         self.axes = plt.axes()