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Change cursor when hovering over draggable artists #25412

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Change cursor when hovering over draggable artists #25412

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3 changes: 3 additions & 0 deletions lib/matplotlib/axes/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1298,6 +1298,9 @@ def __clear(self):
self.child_axes = []
self._current_image = None # strictly for pyplot via _sci, _gci
self._projection_init = None # strictly for pyplot.subplot

if hasattr(self, "legend_") and self.legend_ is not None:
self.legend_.axes = self.legend_.figure = None
self.legend_ = None
self.containers = []

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34 changes: 33 additions & 1 deletion lib/matplotlib/offsetbox.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@
import matplotlib.path as mpath
import matplotlib.text as mtext
import matplotlib.transforms as mtransforms
from matplotlib.backend_tools import Cursors
from matplotlib.font_manager import FontProperties
from matplotlib.image import BboxImage
from matplotlib.patches import (
Expand Down Expand Up @@ -1489,6 +1490,7 @@ def __init__(self, ref_artist, use_blit=False):
if not ref_artist.pickable():
ref_artist.set_picker(True)
self.got_artist = False
self._hover = False
self._use_blit = use_blit and self.canvas.supports_blit
callbacks = ref_artist.figure._canvas_callbacks
self._disconnectors = [
Expand All @@ -1508,7 +1510,33 @@ def __init__(self, ref_artist, use_blit=False):
disconnect.args[0] for disconnect in self._disconnectors[:2]])

def on_motion(self, evt):
if self._check_still_parented() and self.got_artist:
# Only check if the widget lock is available, setting it would prevent
# picking.
if not (
self._check_still_parented()
and self.canvas.widgetlock.available(self)
and self.ref_artist.pickable()
):
return
Comment on lines +1515 to +1520
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@timhoffm timhoffm Aug 1, 2023 •
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Is the logic correct? If self.ref_artist.pickable() is False, we return. That means we never reach the original if self.got_artist: branch.


picker = self.ref_artist.get_picker()
if callable(picker):
inside, _ = picker(self, evt)
else:
inside, _ = self.ref_artist.contains(evt)

# If the mouse is moving quickly while dragging, it may leave the artist,
# but should still use the move cursor.
if inside or self.got_artist:
self._hover = True
self.canvas.set_cursor(Cursors.MOVE)
elif self._hover:
# Only change the cursor back if this is the widget that set it, to
# avoid multiple draggable widgets fighting over the cursor.
self._hover = False
self.canvas.set_cursor(Cursors.POINTER)

if self.got_artist:
dx = evt.x - self.mouse_x
dy = evt.y - self.mouse_y
self.update_offset(dx, dy)
Expand Down Expand Up @@ -1554,6 +1582,10 @@ def disconnect(self):
for disconnector in self._disconnectors:
disconnector()

if self._hover:
self._hover = False
self.canvas.set_cursor(Cursors.POINTER)

def save_offset(self):
pass

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12 changes: 9 additions & 3 deletions lib/matplotlib/tests/test_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8644,13 +8644,19 @@ def test_extent_units():

def test_cla_clears_children_axes_and_fig():
fig, ax = plt.subplots()
lines = ax.plot([], [], [], [])

lines = ax.plot([], [], [], [], label="line")
img = ax.imshow([[1]])
for art in lines + [img]:
legend = ax.legend()

children = [*lines, img, legend]

for art in children:
assert art.axes is ax
assert art.figure is fig

ax.clear()
for art in lines + [img]:
for art in children:
assert art.axes is None
assert art.figure is None

Expand Down