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There's two aspects from its documentation (https://xkbcommon.org/doc/current/group__state.html#gae56031a8c1d48e7802da32f5f39f5738) affecting us here: 1. "This function is similar to xkb_state_key_get_syms(), but intended for users which cannot or do not want to handle the case where multiple keysyms are returned (in which case this function is preferred)." We are indeed in that field, and have been for a long time. 2. "This function performs Capitalization Keysym Transformations." This is unlike the xkb_key_get_syms() function that we use, and convenient here for parity with X11 since it behaves exactly that way. Fixes cases where the keysym for some keys is not properly capitalized when caps lock is toggled, due to the output of capslock+key being different from shift+key. An example of this is 'é' in french(azerty) layout (bound to the '2' key). Even though shift+2 outputs '2', capslock+é should output 'É'. Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3058 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3306>
124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
/*
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* Copyright (C) 2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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* Authors:
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* Kristian Høgsberg
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* Damien Lespiau <damien.lespiau@intel.com>
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*/
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#include "config.h"
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#include "backends/native/meta-xkb-utils.h"
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#include "clutter/clutter-keysyms.h"
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#include "clutter/clutter-mutter.h"
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/*
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* _clutter_event_new_from_evdev: Create a new Clutter ClutterKeyEvent
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* @device: a ClutterInputDevice
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* @xkb: XKB rules to translate the event
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* @_time: timestamp of the event
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* @key: a key code coming from a Linux input device
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* @state: TRUE if a press event, FALSE if a release event
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* @modifer_state: in/out
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*
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* Translate @key to a #ClutterKeyEvent using rules from xbbcommon.
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*
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* Return value: the new #ClutterEvent
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*/
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ClutterEvent *
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meta_key_event_new_from_evdev (ClutterInputDevice *device,
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ClutterInputDevice *core_device,
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ClutterEventFlags flags,
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struct xkb_state *xkb_state,
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uint32_t button_state,
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uint64_t time_us,
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xkb_keycode_t key,
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uint32_t state)
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{
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ClutterEvent *event;
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xkb_keysym_t sym;
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char buffer[8];
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gunichar unicode_value;
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ClutterModifierType modifiers;
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int n;
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/* We use a fixed offset of 8 because evdev starts KEY_* numbering from
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* 0, whereas X11's minimum keycode, for really stupid reasons, is 8.
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* So the evdev XKB rules are based on the keycodes all being shifted
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* upwards by 8. */
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key = meta_xkb_evdev_to_keycode (key);
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sym = xkb_state_key_get_one_sym (xkb_state, key);
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modifiers = xkb_state_serialize_mods (xkb_state, XKB_STATE_MODS_EFFECTIVE) |
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button_state;
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n = xkb_keysym_to_utf8 (sym, buffer, sizeof (buffer));
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if (n == 0)
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{
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/* not printable */
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unicode_value = (gunichar) '\0';
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}
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else
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{
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unicode_value = g_utf8_get_char_validated (buffer, n);
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if (unicode_value == -1 || unicode_value == -2)
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unicode_value = (gunichar) '\0';
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}
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event = clutter_event_key_new (state ?
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CLUTTER_KEY_PRESS : CLUTTER_KEY_RELEASE,
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flags,
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time_us,
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device,
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modifiers,
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sym,
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key - 8,
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key,
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unicode_value);
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return event;
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}
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ClutterModifierType
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meta_xkb_translate_modifiers (struct xkb_state *state,
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ClutterModifierType button_state)
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{
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ClutterModifierType modifiers;
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modifiers = xkb_state_serialize_mods (state, XKB_STATE_MODS_EFFECTIVE);
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modifiers |= button_state;
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return modifiers;
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}
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uint32_t
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meta_xkb_keycode_to_evdev (uint32_t xkb_keycode)
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{
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/* The keycodes from the evdev backend are almost evdev
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* keycodes: we use the evdev keycode file, but xkb rules have an
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* offset by 8. See the comment in _clutter_key_event_new_from_evdev()
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*/
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return xkb_keycode - 8;
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}
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uint32_t
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meta_xkb_evdev_to_keycode (uint32_t evcode)
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{
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/* The inverse of meta_xkb_keycode_to_evdev */
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return evcode + 8;
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}
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