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TkTimer interval=0 workaround by richardsheridan · Pull Request #18284 · matplotlib/matplotlib · GitHub

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TkTimer interval=0 workaround #18284

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Merged
dopplershift merged 2 commits into from
Aug 18, 2020
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Merged

TkTimer interval=0 workaround #18284

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ab3c696
use after idle after 0 incantation for TkTimer
richardsheridan Aug 18, 2020
5ca19cd
boolean check to int comparison
richardsheridan Aug 18, 2020
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11 changes: 10 additions & 1 deletion lib/matplotlib/backends/_backend_tk.py
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,16 @@ def _on_timer(self):
# if _timer is None, this means that _timer_stop has been called; so
# don't recreate the timer in that case.
if not self._single and self._timer:
self._timer = self.parent.after(self._interval, self._on_timer)
if self._interval > 0:
self._timer = self.parent.after(self._interval, self._on_timer)
else:
# Edge case: Tcl after 0 *prepends* events to the queue
# so a 0 interval does not allow any other events to run.
# This incantation is cancellable and runs as fast as possible
# while also allowing events and drawing every frame. GH#18236
self._timer = self.parent.after_idle(
lambda: self.parent.after(self._interval, self._on_timer)
)
else:
self._timer = None

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