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Prevent blitting errors after canvas swap in RadioButtons and CheckButtons #30945

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Merged
ksunden merged 1 commit into from
Jan 15, 2026
Merged

Prevent blitting errors after canvas swap in RadioButtons and CheckButtons #30945

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25 changes: 17 additions & 8 deletions lib/matplotlib/widgets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1108,7 +1108,7 @@ def __init__(self, ax, labels, actives=None, *, useblit=True,
if actives is None:
actives = [False] * len(labels)

self._useblit = useblit and self.canvas.supports_blit # TODO: make dynamic
self._useblit = useblit

ys = np.linspace(1, 0, len(labels)+2)[1:-1]

Expand Down Expand Up @@ -1136,7 +1136,10 @@ def __init__(self, ax, labels, actives=None, *, useblit=True,
**cbook.normalize_kwargs(check_props, collections.PathCollection),
'marker': 'x',
'transform': ax.transAxes,
'animated': self._useblit,
'animated': self._useblit and self.canvas.supports_blit,
# TODO: This may need an update when switching out the canvas.
# Can set this to `_useblit` only and live with the animated=True
# overhead on unsupported backends.
}
check_props.setdefault('facecolor', check_props.pop('color', 'black'))
self._checks = ax.scatter([0.15] * len(ys), ys, **check_props)
Expand All @@ -1155,7 +1158,8 @@ def _clear(self, event):
"""Internal event handler to clear the buttons."""
if self.ignore(event) or self.canvas.is_saving():
return
self._save_blit_background(self.canvas.copy_from_bbox(self.ax.bbox))
if self._useblit and self.canvas.supports_blit:
self._save_blit_background(self.canvas.copy_from_bbox(self.ax.bbox))
self.ax.draw_artist(self._checks)

@_call_with_reparented_event
Expand Down Expand Up @@ -1260,7 +1264,7 @@ def set_active(self, index, state=None):
self._checks.set_facecolor(facecolors)

if self.drawon:
if self._useblit:
if self._useblit and self.canvas.supports_blit:
background = self._load_blit_background()
if background is not None:
self.canvas.restore_region(background)
Expand Down Expand Up @@ -1701,7 +1705,7 @@ def __init__(self, ax, labels, active=0, activecolor=None, *,

ys = np.linspace(1, 0, len(labels) + 2)[1:-1]

self._useblit = useblit and self.canvas.supports_blit # TODO: make dynamic
self._useblit = useblit

label_props = _expand_text_props(label_props)
self.labels = [
Expand All @@ -1716,7 +1720,11 @@ def __init__(self, ax, labels, active=0, activecolor=None, *,
**radio_props,
'marker': 'o',
'transform': ax.transAxes,
'animated': self._useblit,
'animated': self._useblit and self.canvas.supports_blit,
# TODO: This may need an update when switching out the canvas.
# Can set this to `_useblit` only and live with the animated=True
# overhead on unsupported backends.

}
radio_props.setdefault('edgecolor', radio_props.get('color', 'black'))
radio_props.setdefault('facecolor',
Expand All @@ -1743,7 +1751,8 @@ def _clear(self, event):
"""Internal event handler to clear the buttons."""
if self.ignore(event) or self.canvas.is_saving():
return
self._save_blit_background(self.canvas.copy_from_bbox(self.ax.bbox))
if self._useblit and self.canvas.supports_blit:
self._save_blit_background(self.canvas.copy_from_bbox(self.ax.bbox))
self.ax.draw_artist(self._buttons)

@_call_with_reparented_event
Expand Down Expand Up @@ -1836,7 +1845,7 @@ def set_active(self, index):
self._buttons.set_facecolor(button_facecolors)

if self.drawon:
if self._useblit:
if self._useblit and self.canvas.supports_blit:
background = self._load_blit_background()
if background is not None:
self.canvas.restore_region(background)
Expand Down
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