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Make draggable callbacks check that artist has not been removed. #10908

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Merged
merged 1 commit into from
Jun 30, 2018
Merged

Make draggable callbacks check that artist has not been removed. #10908

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17 changes: 12 additions & 5 deletions lib/matplotlib/offsetbox.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1615,8 +1615,8 @@ def finalize_offset(self):
*update_offset* places the artists simply in display
coordinates. And *finalize_offset* recalculate their position in
the normalized axes coordinate and set a relavant attribute.

"""

def __init__(self, ref_artist, use_blit=False):
self.ref_artist = ref_artist
self.got_artist = False
Expand All @@ -1631,14 +1631,14 @@ def __init__(self, ref_artist, use_blit=False):
self.cids = [c2, c3]

def on_motion(self, evt):
if self.got_artist:
if self._check_still_parented() and self.got_artist:
dx = evt.x - self.mouse_x
dy = evt.y - self.mouse_y
self.update_offset(dx, dy)
self.canvas.draw()

def on_motion_blit(self, evt):
if self.got_artist:
if self._check_still_parented() and self.got_artist:
dx = evt.x - self.mouse_x
dy = evt.y - self.mouse_y
self.update_offset(dx, dy)
Expand All @@ -1647,7 +1647,7 @@ def on_motion_blit(self, evt):
self.canvas.blit(self.ref_artist.figure.bbox)

def on_pick(self, evt):
if evt.artist == self.ref_artist:
if self._check_still_parented() and evt.artist == self.ref_artist:

self.mouse_x = evt.mouseevent.x
self.mouse_y = evt.mouseevent.y
Expand All @@ -1668,14 +1668,21 @@ def on_pick(self, evt):
self.save_offset()

def on_release(self, event):
if self.got_artist:
if self._check_still_parented() and self.got_artist:
self.finalize_offset()
self.got_artist = False
self.canvas.mpl_disconnect(self._c1)

if self._use_blit:
self.ref_artist.set_animated(False)

def _check_still_parented(self):
if self.ref_artist.figure is None:
self.disconnect()
return False
else:
return True

def disconnect(self):
"""disconnect the callbacks"""
for cid in self.cids:
Expand Down