FIX: callbacks do not raise after removal of widget axes

tacaswell · tacaswell · commit db2176f27822 · 2025-07-17T20:13:37.000-04:00
closes #25572
diff --git a/lib/matplotlib/widgets.py b/lib/matplotlib/widgets.py
@@ -117,7 +117,9 @@ def __init__(self, ax):
         self.ax = ax
         self._cids = []
 
-    canvas = property(lambda self: self.ax.get_figure(root=True).canvas)
+    canvas = property(
+        lambda self: getattr(self.ax.get_figure(root=True), 'canvas', None)
+    )
 
     def connect_event(self, event, callback):
         """
@@ -1085,7 +1087,7 @@ def __init__(self, ax, labels, actives=None, *, useblit=True,
 
     def _clear(self, event):
         """Internal event handler to clear the buttons."""
-        if self.ignore(event) or self.canvas.is_saving():
+        if self.ignore(event) or self.canvas is None or self.canvas.is_saving():
             return
         self._background = self.canvas.copy_from_bbox(self.ax.bbox)
         self.ax.draw_artist(self._checks)
@@ -1663,7 +1665,7 @@ def __init__(self, ax, labels, active=0, activecolor=None, *,
 
     def _clear(self, event):
         """Internal event handler to clear the buttons."""
-        if self.ignore(event) or self.canvas.is_saving():
+        if self.ignore(event) or self.canvas is None or self.canvas.is_saving():
             return
         self._background = self.canvas.copy_from_bbox(self.ax.bbox)
         self.ax.draw_artist(self._buttons)
@@ -2181,6 +2183,8 @@ def connect_default_events(self):
 
     def ignore(self, event):
         # docstring inherited
+        if self.canvas is None:
+            return True
         if not self.active or not self.ax.get_visible():
             return True
         # If canvas was locked
