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FIX: be very paranoid about checking what the current canvas is #25573

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Merged
merged 2 commits into from
Jul 18, 2025
Merged

FIX: be very paranoid about checking what the current canvas is #25573

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5a9f7cb
TST: Add tests for saving a figure after removing a widget axes
tacaswell Mar 29, 2023
5c83d7b
FIX: callbacks do not raise after removal of widget axes
tacaswell Jul 18, 2025
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25 changes: 24 additions & 1 deletion lib/matplotlib/tests/test_widgets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
import operator
from unittest import mock

from matplotlib.backend_bases import MouseEvent
from matplotlib.backend_bases import MouseEvent, DrawEvent
import matplotlib.colors as mcolors
import matplotlib.widgets as widgets
import matplotlib.pyplot as plt
Expand Down Expand Up @@ -1757,3 +1757,26 @@ def test_MultiCursor(horizOn, vertOn):
assert l.get_xdata() == (.5, .5)
for l in multi.hlines:
assert l.get_ydata() == (.25, .25)


def test_parent_axes_removal():

fig, (ax_radio, ax_checks) = plt.subplots(1, 2)

radio = widgets.RadioButtons(ax_radio, ['1', '2'], 0)
checks = widgets.CheckButtons(ax_checks, ['1', '2'], [True, False])

ax_checks.remove()
ax_radio.remove()
with io.BytesIO() as out:
# verify that saving does not raise
fig.savefig(out, format='raw')

# verify that this method which is triggered by a draw_event callback when
# blitting is enabled does not raise. Calling private methods is simpler
# than trying to force blitting to be enabled with Agg or use a GUI
# framework.
renderer = fig._get_renderer()
evt = DrawEvent('draw_event', fig.canvas, renderer)
radio._clear(evt)
checks._clear(evt)
12 changes: 10 additions & 2 deletions lib/matplotlib/widgets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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):
"""
Expand All @@ -144,6 +146,10 @@ def _get_data_coords(self, event):
return ((event.xdata, event.ydata) if event.inaxes is self.ax
else self.ax.transData.inverted().transform((event.x, event.y)))

def ignore(self, event):
# docstring inherited
return super().ignore(event) or self.canvas is None


class Button(AxesWidget):
"""
Expand Down Expand Up @@ -2181,7 +2187,9 @@ def connect_default_events(self):

def ignore(self, event):
# docstring inherited
if not self.active or not self.ax.get_visible():
if super().ignore(event):
return True
if not self.ax.get_visible():
return True
# If canvas was locked
if not self.canvas.widgetlock.available(self):
Expand Down
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