diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
index ffb3b17d33cb..bc69e08aa396 100644
--- a/lib/matplotlib/backends/_backend_tk.py
+++ b/lib/matplotlib/backends/_backend_tk.py
@@ -166,6 +166,7 @@ def __init__(self, figure=None, master=None, resize_callback=None):
super().__init__(figure)
self._idle = True
self._idle_callback = None
+ self._event_loop_id = None
w, h = self.figure.bbox.size.astype(int)
self._tkcanvas = tk.Canvas(
master=master, background="white",
@@ -359,11 +360,20 @@ def flush_events(self):
def start_event_loop(self, timeout=0):
# docstring inherited
if timeout > 0:
- self._master.after(int(1000*timeout), self.stop_event_loop)
+ milliseconds = int(1000 * timeout)
+ if milliseconds > 0:
+ self._event_loop_id = self._tkcanvas.after(
+ milliseconds, self.stop_event_loop)
+ else:
+ self._event_loop_id = self._tkcanvas.after_idle(
+ self.stop_event_loop)
self._master.mainloop()
def stop_event_loop(self):
# docstring inherited
+ if self._event_loop_id:
+ self._master.after_cancel(self._event_loop_id)
+ self._event_loop_id = None
self._master.quit()
@@ -439,6 +449,8 @@ def destroy(*args):
def destroy(self, *args):
if self.canvas._idle_callback:
self.canvas._tkcanvas.after_cancel(self.canvas._idle_callback)
+ if self.canvas._event_loop_id:
+ self.canvas._tkcanvas.after_cancel(self.canvas._event_loop_id)
# NOTE: events need to be flushed before issuing destroy (GH #9956),
# however, self.window.update() can break user code. This is the
@@ -451,7 +463,8 @@ def delayed_destroy():
if self._owns_mainloop and not Gcf.get_num_fig_managers():
self.window.quit()
- self.window.after_idle(delayed_destroy)
+ # "after idle after 0" avoids Tcl error/race (GH #19940)
+ self.window.after_idle(self.window.after, 0, delayed_destroy)
def get_window_title(self):
return self.window.wm_title()
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