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option+letter on OSX with tkagg give non-alpha numeric rather than alt-<letter> #22934

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option+letter on OSX with tkagg give non-alpha numeric rather than alt-<letter>#22934
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Difficulty: Mediumhttps://matplotlib.org/devdocs/devel/contribute.html#good-first-issuesGUI: MacOSXGUI: tk
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future releases
@tacaswell

Description

@tacaswell
tacaswell
opened on Apr 28, 2022

This issue is restricted to:

  • tk backend
  • on OSX

matplotlib/lib/matplotlib/backends/_backend_tk.py

Line 179 in 1ab4a53

self._tkcanvas.bind("<Key>", self.key_press)

to

matplotlib/lib/matplotlib/backends/_backend_tk.py

Lines 356 to 358 in 1ab4a53

def key_press(self, event):
key = self._get_key(event)
FigureCanvasBase.key_press_event(self, key, guiEvent=event)

to

matplotlib/lib/matplotlib/backends/_backend_tk.py

Lines 317 to 352 in 1ab4a53

def _get_key(self, event):
unikey = event.char
key = cbook._unikey_or_keysym_to_mplkey(unikey, event.keysym)
# add modifier keys to the key string. Bit details originate from
# http://effbot.org/tkinterbook/tkinter-events-and-bindings.htm
# BIT_SHIFT = 0x001; BIT_CAPSLOCK = 0x002; BIT_CONTROL = 0x004;
# BIT_LEFT_ALT = 0x008; BIT_NUMLOCK = 0x010; BIT_RIGHT_ALT = 0x080;
# BIT_MB_1 = 0x100; BIT_MB_2 = 0x200; BIT_MB_3 = 0x400;
# In general, the modifier key is excluded from the modifier flag,
# however this is not the case on "darwin", so double check that
# we aren't adding repeat modifier flags to a modifier key.
if sys.platform == 'win32':
modifiers = [(2, 'ctrl', 'control'),
(17, 'alt', 'alt'),
(0, 'shift', 'shift'),
]
elif sys.platform == 'darwin':
modifiers = [(2, 'ctrl', 'control'),
(4, 'alt', 'alt'),
(0, 'shift', 'shift'),
(3, 'super', 'super'),
]
else:
modifiers = [(2, 'ctrl', 'control'),
(3, 'alt', 'alt'),
(0, 'shift', 'shift'),
(6, 'super', 'super'),
]
if key is not None:
# shift is not added to the keys as this is already accounted for
for bitmask, prefix, key_name in modifiers:
if event.state & (1 << bitmask) and key_name not in key:
if not (prefix == 'shift' and unikey):
key = '{0}+{1}'.format(prefix, key)

is the call chain on our side. This makes me think that the conversion is happening before it gets to us (but someone with a mac should probably verify that).

Originally posted by @tacaswell in #22681 (comment)

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    Difficulty: Mediumhttps://matplotlib.org/devdocs/devel/contribute.html#good-first-issuesGUI: MacOSXGUI: tk

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