GTK key name changes

The handling of non-ASCII keypresses (as reported in the KeyEvent passed to

``key_press_event``-handlers) in the GTK backends now correctly reports Unicode

characters (e.g., €), and respects NumLock on the numpad.

The following key names have changed; the new names are consistent with those

reported by the Qt backends:

- The "Break/Pause" key (keysym 0xff13) is now reported as "pause" instead of

"break" (this is also consistent with the X key name).

- The numpad "delete" key is now reported as "delete" instead of "dec".

key = chr(Gdk.keyval_to_unicode(event.keyval))

if not key.isprintable():

key = Gdk.keyval_name(event.keyval).lower()

if key.startswith("kp_"): # keypad_x (including kp_enter).

key = key[3:]

if key.startswith("page_"): # page_{up,down}

key = key.replace("page_", "page")

if key.endswith(("_l", "_r")): # alt_l, ctrl_l, shift_l.

key = key[:-2]

if key == "enter":

key = "return"

from matplotlib import pyplot as plt

import pytest

pytest.importorskip("matplotlib.backends.backend_gtk3agg")

def test_correct_key():

pytest.xfail("test_widget_send_event is not triggering key_press_event")

from gi.repository import Gdk, Gtk

fig = plt.figure()

buf = []

def send(event):

for key, mod in [

(Gdk.KEY_a, Gdk.ModifierType.SHIFT_MASK),

(Gdk.KEY_a, 0),

(Gdk.KEY_a, Gdk.ModifierType.CONTROL_MASK),

(Gdk.KEY_agrave, 0),

(Gdk.KEY_Control_L, Gdk.ModifierType.MOD1_MASK),

(Gdk.KEY_Alt_L, Gdk.ModifierType.CONTROL_MASK),

(Gdk.KEY_agrave,

Gdk.ModifierType.CONTROL_MASK

| Gdk.ModifierType.MOD1_MASK

| Gdk.ModifierType.MOD4_MASK),

(0xfd16, 0), # KEY_3270_Play.

(Gdk.KEY_BackSpace, 0),

(Gdk.KEY_BackSpace, Gdk.ModifierType.CONTROL_MASK),

]:

# This is not actually really the right API: it depends on the

# actual keymap (e.g. on Azerty, shift+agrave -> 0).

Gtk.test_widget_send_key(fig.canvas, key, mod)

def receive(event):

buf.append(event.key)

if buf == [

"A", "a", "ctrl+a",

"\N{LATIN SMALL LETTER A WITH GRAVE}",

"alt+control", "ctrl+alt",

"ctrl+alt+super+\N{LATIN SMALL LETTER A WITH GRAVE}",

# (No entry for KEY_3270_Play.)

"backspace", "ctrl+backspace",

]:

plt.close(fig)

fig.canvas.mpl_connect("draw_event", send)

fig.canvas.mpl_connect("key_press_event", receive)

plt.show()