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FIX: Only send one update signal when autoscaling norms #25079

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Merged
merged 1 commit into from
Jan 25, 2023
Merged

FIX: Only send one update signal when autoscaling norms #25079

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8 changes: 6 additions & 2 deletions lib/matplotlib/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1362,8 +1362,12 @@ def inverse(self, value):

def autoscale(self, A):
"""Set *vmin*, *vmax* to min, max of *A*."""
self.vmin = self.vmax = None
self.autoscale_None(A)
with self.callbacks.blocked():
# Pause callbacks while we are updating so we only get
# a single update signal at the end
self.vmin = self.vmax = None
self.autoscale_None(A)
Comment on lines +1365 to +1369
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Maybe just?

Suggested change
with self.callbacks.blocked():
# Pause callbacks while we are updating so we only get
# a single update signal at the end
self.vmin = self.vmax = None
self.autoscale_None(A)
if A.size():
self.vmin = A.min()
self.vmax = A.max()

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subclasses overwrite autoscale_None() to handle that themselves, so I think we need to defer to their implementations. I'd save that for another PR if someone wants to tackle it.

self._changed()

def autoscale_None(self, A):
"""If vmin or vmax are not set, use the min/max of *A* to set them."""
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5 changes: 5 additions & 0 deletions lib/matplotlib/tests/test_colors.py
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Expand Up @@ -1493,6 +1493,11 @@ def test_norm_callback():
norm.vmax = 5
assert increment.call_count == 2

# We only want autoscale() calls to send out one update signal
increment.call_count = 0
norm.autoscale([0, 1, 2])
assert increment.call_count == 1


def test_scalarmappable_norm_update():
norm = mcolors.Normalize()
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