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Don't recursively call draw_idle when updating artists at draw time. #16298

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Merged
merged 1 commit into from
Jan 27, 2020
Merged

Don't recursively call draw_idle when updating artists at draw time. #16298

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6 changes: 4 additions & 2 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1617,8 +1617,10 @@ def _fix_ipython_backend2gui(cls):
@contextmanager
def _idle_draw_cntx(self):
self._is_idle_drawing = True
yield
self._is_idle_drawing = False
try:
yield
finally:
self._is_idle_drawing = False

def is_saving(self):
"""
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21 changes: 11 additions & 10 deletions lib/matplotlib/backends/backend_qt5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -481,16 +481,17 @@ def draw_idle(self):
QtCore.QTimer.singleShot(0, self._draw_idle)

def _draw_idle(self):
if not self._draw_pending:
return
self._draw_pending = False
if self.height() < 0 or self.width() < 0:
return
try:
self.draw()
except Exception:
# Uncaught exceptions are fatal for PyQt5, so catch them instead.
traceback.print_exc()
with self._idle_draw_cntx():
if not self._draw_pending:
return
self._draw_pending = False
if self.height() < 0 or self.width() < 0:
return
try:
self.draw()
except Exception:
# Uncaught exceptions are fatal for PyQt5, so catch them.
traceback.print_exc()

def drawRectangle(self, rect):
# Draw the zoom rectangle to the QPainter. _draw_rect_callback needs
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11 changes: 9 additions & 2 deletions lib/matplotlib/pyplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -565,8 +565,15 @@ def _auto_draw_if_interactive(fig, val):
fig : Figure
A figure object which is assumed to be associated with a canvas
"""
if val and matplotlib.is_interactive() and not fig.canvas.is_saving():
fig.canvas.draw_idle()
if (val and matplotlib.is_interactive()
and not fig.canvas.is_saving()
and not fig.canvas._is_idle_drawing):
# Some artists can mark themselves as stale in the middle of drawing
# (e.g. axes position & tick labels being computed at draw time), but
# this shouldn't trigger a redraw because the current redraw will
# already take them into account.
with fig.canvas._idle_draw_cntx():
fig.canvas.draw_idle()


def gcf():
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