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clutter/x11: Implement keycode remap to keysyms on virtual key devices

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Keycode lookup can fail for serveral reasons, e.g. if there is no combination of
modifiers and keycodes that can produce the target keysym with the current
keyboard layout.

In case the keycode lookup fails, remap temporarily the keysym to an unused
keycodes.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/109
This commit is contained in:
Andrea Azzarone 2018-07-13 14:49:38 +02:00 committed by Carlos Garnacho
parent fda2e798bb
commit e3e933c47a
3 changed files with 172 additions and 6 deletions
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153
clutter/clutter/x11/clutter-keymap-x11.c
View File

@ -76,6 +76,9 @@ struct _ClutterKeymapX11
DirectionCacheEntry group_direction_cache[4];
int current_group;
GHashTable *reserved_keycodes;
GQueue *available_keycodes;
guint caps_lock_state : 1;
guint num_lock_state : 1;
guint has_direction : 1;
@ -422,15 +425,97 @@ clutter_keymap_x11_set_property (GObject *gobject,
}
}
static void
clutter_keymap_x11_refresh_reserved_keycodes (ClutterKeymapX11 *keymap_x11)
{
Display *dpy = clutter_x11_get_default_display ();
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init (&iter, keymap_x11->reserved_keycodes);
while (g_hash_table_iter_next (&iter, &key, &value))
{
guint reserved_keycode = GPOINTER_TO_UINT (key);
guint reserved_keysym = GPOINTER_TO_UINT (value);
guint actual_keysym = XkbKeycodeToKeysym (dpy, reserved_keycode, 0, 0);
/* If an available keycode is no longer mapped to the stored keysym, then
* the keycode should not be considered available anymore and should be
* removed both from the list of available and reserved keycodes.
*/
if (reserved_keysym != actual_keysym)
{
g_hash_table_iter_remove (&iter);
g_queue_remove (keymap_x11->available_keycodes, key);
}
}
}
static gboolean
clutter_keymap_x11_replace_keycode (ClutterKeymapX11 *keymap_x11,
KeyCode keycode,
KeySym keysym)
{
if (CLUTTER_BACKEND_X11 (keymap_x11->backend)->use_xkb)
{
Display *dpy = clutter_x11_get_default_display ();
XkbDescPtr xkb = get_xkb (keymap_x11);
XkbMapChangesRec changes;
XFlush (dpy);
xkb->device_spec = XkbUseCoreKbd;
memset (&changes, 0, sizeof(changes));
if (keysym != NoSymbol)
{
int types[XkbNumKbdGroups] = { XkbOneLevelIndex };
XkbChangeTypesOfKey (xkb, keycode, 1, XkbGroup1Mask, types, &changes);
XkbKeySymEntry (xkb, keycode, 0, 0) = keysym;
}
else
{
/* Reset to NoSymbol */
XkbChangeTypesOfKey (xkb, keycode, 0, XkbGroup1Mask, NULL, &changes);
}
changes.changed = XkbKeySymsMask | XkbKeyTypesMask;
changes.first_key_sym = keycode;
changes.num_key_syms = 1;
changes.first_type = 0;
changes.num_types = xkb->map->num_types;
XkbChangeMap (dpy, xkb, &changes);
XFlush (dpy);
return TRUE;
}
return FALSE;
}
static void
clutter_keymap_x11_finalize (GObject *gobject)
{
ClutterKeymapX11 *keymap;
ClutterEventTranslator *translator;
GHashTableIter iter;
gpointer key, value;
keymap = CLUTTER_KEYMAP_X11 (gobject);
translator = CLUTTER_EVENT_TRANSLATOR (keymap);
clutter_keymap_x11_refresh_reserved_keycodes (keymap);
g_hash_table_iter_init (&iter, keymap->reserved_keycodes);
while (g_hash_table_iter_next (&iter, &key, &value))
{
guint keycode = GPOINTER_TO_UINT (key);
clutter_keymap_x11_replace_keycode (keymap, keycode, NoSymbol);
}
g_hash_table_destroy (keymap->reserved_keycodes);
g_queue_free (keymap->available_keycodes);
_clutter_backend_remove_event_translator (keymap->backend, translator);
if (keymap->xkb_desc != NULL)
@ -462,6 +547,8 @@ clutter_keymap_x11_init (ClutterKeymapX11 *keymap)
{
keymap->current_direction = PANGO_DIRECTION_NEUTRAL;
keymap->current_group = -1;
keymap->reserved_keycodes = g_hash_table_new (NULL, NULL);
keymap->available_keycodes = g_queue_new ();
}
static ClutterTranslateReturn
@ -731,6 +818,72 @@ clutter_keymap_x11_get_entries_for_keyval (ClutterKeymapX11 *keymap_x11,
}
}
static guint
clutter_keymap_x11_get_available_keycode (ClutterKeymapX11 *keymap_x11)
{
if (CLUTTER_BACKEND_X11 (keymap_x11->backend)->use_xkb)
{
clutter_keymap_x11_refresh_reserved_keycodes (keymap_x11);
if (g_hash_table_size (keymap_x11->reserved_keycodes) < 5)
{
Display *dpy = clutter_x11_get_default_display ();
XkbDescPtr xkb = get_xkb (keymap_x11);
guint i;
for (i = xkb->max_key_code; i >= xkb->min_key_code; --i)
{
if (XkbKeycodeToKeysym (dpy, i, 0, 0) == NoSymbol)
return i;
}
}
return GPOINTER_TO_UINT (g_queue_pop_head (keymap_x11->available_keycodes));
}
return 0;
}
gboolean clutter_keymap_x11_reserve_keycode (ClutterKeymapX11 *keymap_x11,
guint keyval,
guint *keycode_out)
{
g_return_val_if_fail (CLUTTER_IS_KEYMAP_X11 (keymap_x11), FALSE);
g_return_val_if_fail (keyval != 0, FALSE);
g_return_val_if_fail (keycode_out != NULL, FALSE);
*keycode_out = clutter_keymap_x11_get_available_keycode (keymap_x11);
if (*keycode_out == NoSymbol)
{
g_warning ("Cannot reserve a keycode for keyval %d: no available keycode", keyval);
return FALSE;
}
if (!clutter_keymap_x11_replace_keycode (keymap_x11, *keycode_out, keyval))
{
g_warning ("Failed to remap keycode %d to keyval %d", *keycode_out, keyval);
return FALSE;
}
g_hash_table_insert (keymap_x11->reserved_keycodes, GUINT_TO_POINTER (*keycode_out), GUINT_TO_POINTER (keyval));
g_queue_remove (keymap_x11->available_keycodes, GUINT_TO_POINTER (*keycode_out));
return TRUE;
}
void clutter_keymap_x11_release_keycode_if_needed (ClutterKeymapX11 *keymap_x11,
guint keycode)
{
g_return_if_fail (CLUTTER_IS_KEYMAP_X11 (keymap_x11));
if (!g_hash_table_contains (keymap_x11->reserved_keycodes, GUINT_TO_POINTER (keycode)) ||
g_queue_index (keymap_x11->available_keycodes, GUINT_TO_POINTER (keycode)) != -1)
return;
g_queue_push_tail (keymap_x11->available_keycodes, GUINT_TO_POINTER (keycode));
}
void
clutter_keymap_x11_latch_modifiers (ClutterKeymapX11 *keymap_x11,
uint32_t level,

6
clutter/clutter/x11/clutter-keymap-x11.h
View File

@ -58,7 +58,11 @@ gboolean clutter_keymap_x11_keycode_for_keyval (ClutterKeymapX11 *keymap_x11,
void clutter_keymap_x11_latch_modifiers (ClutterKeymapX11 *keymap_x11,
uint32_t level,
gboolean enable);
gboolean clutter_keymap_x11_reserve_keycode (ClutterKeymapX11 *keymap_x11,
guint keyval,
guint *keycode_out);
void clutter_keymap_x11_release_keycode_if_needed (ClutterKeymapX11 *keymap_x11,
guint keycode);
G_END_DECLS
#endif /* __CLUTTER_KEYMAP_X11_H__ */

19
clutter/clutter/x11/clutter-virtual-input-device-x11.c
View File

@ -141,8 +141,13 @@ clutter_virtual_input_device_x11_notify_keyval (ClutterVirtualInputDevice *virtu
if (!clutter_keymap_x11_keycode_for_keyval (keymap, keyval, &keycode, &level))
{
g_warning ("No keycode found for keyval %x in current group", keyval);
return;
level = 0;
if (!clutter_keymap_x11_reserve_keycode (keymap, keyval, &keycode))
{
g_warning ("No keycode found for keyval %x in current group", keyval);
return;
}
}
if (!_clutter_keymap_x11_get_is_modifier (keymap, keycode) &&
@ -153,9 +158,13 @@ clutter_virtual_input_device_x11_notify_keyval (ClutterVirtualInputDevice *virtu
(KeyCode) keycode,
key_state == CLUTTER_KEY_STATE_PRESSED, 0);
if (!_clutter_keymap_x11_get_is_modifier (keymap, keycode) &&
key_state == CLUTTER_KEY_STATE_RELEASED)
clutter_keymap_x11_latch_modifiers (keymap, level, FALSE);
if (key_state == CLUTTER_KEY_STATE_RELEASED)
{
if (!_clutter_keymap_x11_get_is_modifier (keymap, keycode))
clutter_keymap_x11_latch_modifiers (keymap, level, FALSE);
clutter_keymap_x11_release_keycode_if_needed (keymap, keycode);
}
}
static void