1 /* gtkkeyhash.c: Keymap aware matching of key bindings
3 * GTK - The GIMP Toolkit
4 * Copyright (C) 2002, Red Hat Inc.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
25 #include "gtkkeyhash.h"
26 #include "gtkprivate.h"
28 typedef struct _GtkKeyHashEntry GtkKeyHashEntry;
30 struct _GtkKeyHashEntry
33 GdkModifierType modifiers;
36 /* Set as a side effect of generating key_hash->keycode_hash
45 GHashTable *keycode_hash;
46 GHashTable *reverse_hash;
48 GDestroyNotify destroy_notify;
52 key_hash_clear_keycode (gpointer key,
61 key_hash_insert_entry (GtkKeyHash *key_hash,
62 GtkKeyHashEntry *entry)
67 gdk_keymap_get_entries_for_keyval (key_hash->keymap,
69 &entry->keys, &entry->n_keys);
71 for (i = 0; i < entry->n_keys; i++)
73 GSList *old_keys = g_hash_table_lookup (key_hash->keycode_hash,
74 GUINT_TO_POINTER (entry->keys[i].keycode));
75 old_keys = g_slist_prepend (old_keys, entry);
76 g_hash_table_insert (key_hash->keycode_hash,
77 GUINT_TO_POINTER (entry->keys[i].keycode),
83 key_hash_get_keycode_hash (GtkKeyHash *key_hash)
85 if (!key_hash->keycode_hash)
89 key_hash->keycode_hash = g_hash_table_new (g_direct_hash, NULL);
91 /* Preserve the original insertion order
93 for (tmp_list = g_list_last (key_hash->entries_list);
95 tmp_list = tmp_list->prev)
96 key_hash_insert_entry (key_hash, tmp_list->data);
99 return key_hash->keycode_hash;
103 key_hash_keys_changed (GdkKeymap *keymap,
104 GtkKeyHash *key_hash)
106 /* The keymap changed, so we have to regenerate the keycode hash
108 if (key_hash->keycode_hash)
110 g_hash_table_foreach (key_hash->keycode_hash, key_hash_clear_keycode, NULL);
111 g_hash_table_destroy (key_hash->keycode_hash);
112 key_hash->keycode_hash = NULL;
118 * @keymap: a #GdkKeymap
119 * @item_destroy_notify: function to be called when items are removed
120 * from the hash or %NULL.
122 * Create a new key hash object for doing binding resolution.
124 * Return value: the newly created object. Free with _gtk_key_hash_free().
127 _gtk_key_hash_new (GdkKeymap *keymap,
128 GDestroyNotify item_destroy_notify)
130 GtkKeyHash *key_hash = g_new (GtkKeyHash, 1);
132 key_hash->keymap = keymap;
133 g_signal_connect (keymap, "keys-changed",
134 G_CALLBACK (key_hash_keys_changed), key_hash);
136 key_hash->entries_list = NULL;
137 key_hash->keycode_hash = NULL;
138 key_hash->reverse_hash = g_hash_table_new (g_direct_hash, NULL);
139 key_hash->destroy_notify = item_destroy_notify;
145 key_hash_free_entry (GtkKeyHash *key_hash,
146 GtkKeyHashEntry *entry)
148 if (key_hash->destroy_notify)
149 (*key_hash->destroy_notify) (entry->value);
151 g_free (entry->keys);
152 g_slice_free (GtkKeyHashEntry, entry);
156 key_hash_free_entry_foreach (gpointer value,
159 GtkKeyHashEntry *entry = value;
160 GtkKeyHash *key_hash = data;
162 key_hash_free_entry (key_hash, entry);
167 * @key_hash: a #GtkKeyHash
169 * Destroys a key hash created with gtk_key_hash_new()
172 _gtk_key_hash_free (GtkKeyHash *key_hash)
174 g_signal_handlers_disconnect_by_func (key_hash->keymap,
175 key_hash_keys_changed,
178 if (key_hash->keycode_hash)
180 g_hash_table_foreach (key_hash->keycode_hash, key_hash_clear_keycode, NULL);
181 g_hash_table_destroy (key_hash->keycode_hash);
184 g_hash_table_destroy (key_hash->reverse_hash);
186 g_list_foreach (key_hash->entries_list, key_hash_free_entry_foreach, key_hash);
187 g_list_free (key_hash->entries_list);
193 * _gtk_key_hash_add_entry:
194 * @key_hash: a #GtkKeyHash
195 * @keyval: key symbol for this binding
196 * @modifiers: modifiers for this binding
197 * @value: value to insert in the key hash
199 * Inserts a pair of key symbol and modifier mask into the key hash.
202 _gtk_key_hash_add_entry (GtkKeyHash *key_hash,
204 GdkModifierType modifiers,
207 GtkKeyHashEntry *entry = g_slice_new (GtkKeyHashEntry);
209 entry->value = value;
210 entry->keyval = keyval;
211 entry->modifiers = modifiers;
214 key_hash->entries_list = g_list_prepend (key_hash->entries_list, entry);
215 g_hash_table_insert (key_hash->reverse_hash, value, key_hash->entries_list);
217 if (key_hash->keycode_hash)
218 key_hash_insert_entry (key_hash, entry);
222 * _gtk_key_hash_remove_entry:
223 * @key_hash: a #GtkKeyHash
224 * @value: value previously added with _gtk_key_hash_add_entry()
226 * Removes a value previously added to the key hash with
227 * _gtk_key_hash_add_entry().
230 _gtk_key_hash_remove_entry (GtkKeyHash *key_hash,
233 GList *entry_node = g_hash_table_lookup (key_hash->reverse_hash, value);
237 GtkKeyHashEntry *entry = entry_node->data;
239 if (key_hash->keycode_hash)
243 for (i = 0; i < entry->n_keys; i++)
245 GSList *old_keys = g_hash_table_lookup (key_hash->keycode_hash,
246 GUINT_TO_POINTER (entry->keys[i].keycode));
248 GSList *new_keys = g_slist_remove (old_keys, entry);
249 if (new_keys != old_keys)
252 g_hash_table_insert (key_hash->keycode_hash,
253 GUINT_TO_POINTER (entry->keys[i].keycode),
256 g_hash_table_remove (key_hash->keycode_hash,
257 GUINT_TO_POINTER (entry->keys[i].keycode));
262 g_hash_table_remove (key_hash->reverse_hash, entry_node);
263 key_hash->entries_list = g_list_delete_link (key_hash->entries_list, entry_node);
265 key_hash_free_entry (key_hash, entry);
270 lookup_result_compare (gconstpointer a,
273 const GtkKeyHashEntry *entry_a = a;
274 const GtkKeyHashEntry *entry_b = b;
280 modifiers = entry_a->modifiers;
288 modifiers = entry_b->modifiers;
296 return n_bits_a < n_bits_b ? -1 : (n_bits_a == n_bits_b ? 0 : 1);
300 /* Sort a list of results so that matches with less modifiers come
301 * before matches with more modifiers
304 sort_lookup_results (GSList *slist)
306 return g_slist_sort (slist, lookup_result_compare);
310 lookup_result_compare_by_keyval (gconstpointer a,
313 const GtkKeyHashEntry *entry_a = a;
314 const GtkKeyHashEntry *entry_b = b;
316 if (entry_a->keyval < entry_b->keyval)
318 else if (entry_a->keyval > entry_b->keyval)
325 sort_lookup_results_by_keyval (GSList *slist)
327 return g_slist_sort (slist, lookup_result_compare_by_keyval);
330 /* Return true if keyval is defined in keyboard group
333 keyval_in_group (GdkKeymap *keymap,
337 GtkKeyHashEntry entry;
340 gdk_keymap_get_entries_for_keyval (keymap,
342 &entry.keys, &entry.n_keys);
344 for (i = 0; i < entry.n_keys; i++)
346 if (entry.keys[i].group == group)
358 * _gtk_key_hash_lookup:
359 * @key_hash: a #GtkKeyHash
360 * @hardware_keycode: hardware keycode field from a #GdkEventKey
361 * @state: state field from a #GdkEventKey
362 * @mask: mask of modifiers to consider when matching against the
363 * modifiers in entries.
364 * @group: group field from a #GdkEventKey
366 * Looks up the best matching entry or entries in the hash table for
367 * a given event. The results are sorted so that entries with less
368 * modifiers come before entries with more modifiers.
370 * The matches returned by this function can be exact (i.e. keycode, level
371 * and group all match) or fuzzy (i.e. keycode and level match, but group
372 * does not). As long there are any exact matches, only exact matches
373 * are returned. If there are no exact matches, fuzzy matches will be
374 * returned, as long as they are not shadowing a possible exact match.
375 * This means that fuzzy matches won't be considered if their keyval is
376 * present in the current group.
378 * Return value: A newly-allocated #GSList of matching entries.
379 * Free with g_slist_free() when no longer needed.
382 _gtk_key_hash_lookup (GtkKeyHash *key_hash,
383 guint16 hardware_keycode,
384 GdkModifierType state,
385 GdkModifierType mask,
388 GHashTable *keycode_hash = key_hash_get_keycode_hash (key_hash);
389 GSList *keys = g_hash_table_lookup (keycode_hash, GUINT_TO_POINTER ((guint)hardware_keycode));
390 GSList *results = NULL;
392 gboolean have_exact = FALSE;
394 gint effective_group;
396 GdkModifierType modifiers;
397 GdkModifierType consumed_modifiers;
398 GdkModifierType shift_group_mask;
399 gboolean group_mod_is_accel_mod = FALSE;
400 const GdkModifierType xmods = GDK_MOD2_MASK|GDK_MOD3_MASK|GDK_MOD4_MASK|GDK_MOD5_MASK;
401 const GdkModifierType vmods = GDK_SUPER_MASK|GDK_HYPER_MASK|GDK_META_MASK;
403 /* We don't want Caps_Lock to affect keybinding lookups.
405 state &= ~GDK_LOCK_MASK;
407 _gtk_translate_keyboard_accel_state (key_hash->keymap,
408 hardware_keycode, state, mask, group,
410 &effective_group, &level, &consumed_modifiers);
412 /* if the group-toggling modifier is part of the default accel mod
413 * mask, and it is active, disable it for matching
415 shift_group_mask = gdk_keymap_get_modifier_mask (key_hash->keymap,
416 GDK_MODIFIER_INTENT_SHIFT_GROUP);
417 if (mask & shift_group_mask)
418 group_mod_is_accel_mod = TRUE;
420 gdk_keymap_map_virtual_modifiers (key_hash->keymap, &mask);
421 gdk_keymap_add_virtual_modifiers (key_hash->keymap, &state);
423 GTK_NOTE (KEYBINDINGS,
424 g_message ("Looking up keycode = %u, modifiers = 0x%04x,\n"
425 " keyval = %u, group = %d, level = %d, consumed_modifiers = 0x%04x",
426 hardware_keycode, state, keyval, effective_group, level, consumed_modifiers));
430 GSList *tmp_list = keys;
433 GtkKeyHashEntry *entry = tmp_list->data;
435 /* If the virtual Super, Hyper or Meta modifiers are present,
436 * they will also be mapped to some of the Mod2 - Mod5 modifiers,
437 * so we compare them twice, ignoring either set.
438 * We accept combinations involving virtual modifiers only if they
439 * are mapped to separate modifiers; i.e. if Super and Hyper are
440 * both mapped to Mod4, then pressing a key that is mapped to Mod4
441 * will not match a Super+Hyper entry.
443 modifiers = entry->modifiers;
444 if (gdk_keymap_map_virtual_modifiers (key_hash->keymap, &modifiers) &&
445 ((modifiers & ~consumed_modifiers & mask & ~vmods) == (state & ~consumed_modifiers & mask & ~vmods) ||
446 (modifiers & ~consumed_modifiers & mask & ~xmods) == (state & ~consumed_modifiers & mask & ~xmods)))
450 if (keyval == entry->keyval && /* Exact match */
451 /* but also match for group if it is an accel mod, because
452 * otherwise we can get multiple exact matches, some being
454 (!group_mod_is_accel_mod ||
455 (state & shift_group_mask) == (entry->modifiers & shift_group_mask)))
458 GTK_NOTE (KEYBINDINGS,
459 g_message (" found exact match, keyval = %u, modifiers = 0x%04x",
460 entry->keyval, entry->modifiers));
464 g_slist_free (results);
469 results = g_slist_prepend (results, entry);
474 for (i = 0; i < entry->n_keys; i++)
476 if (entry->keys[i].keycode == hardware_keycode &&
477 entry->keys[i].level == level &&
478 /* Only match for group if it's an accel mod */
479 (!group_mod_is_accel_mod ||
480 entry->keys[i].group == effective_group))
482 GTK_NOTE (KEYBINDINGS,
483 g_message (" found group = %d, level = %d",
484 entry->keys[i].group, entry->keys[i].level));
485 results = g_slist_prepend (results, entry);
492 tmp_list = tmp_list->next;
496 if (!have_exact && results)
498 /* If there are fuzzy matches, check that the current group doesn't also
499 * define these keyvals; if yes, discard results because a widget up in
500 * the stack may have an exact match and we don't want to 'steal' it.
503 GtkKeyHashEntry *keyhashentry;
505 results = sort_lookup_results_by_keyval (results);
506 for (l = results; l; l = l->next)
508 keyhashentry = l->data;
509 if (l == results || oldkeyval != keyhashentry->keyval)
511 oldkeyval = keyhashentry->keyval;
512 if (keyval_in_group (key_hash->keymap, oldkeyval, group))
514 g_slist_free (results);
521 results = sort_lookup_results (results);
522 for (l = results; l; l = l->next)
523 l->data = ((GtkKeyHashEntry *)l->data)->value;
529 * _gtk_key_hash_lookup_keyval:
530 * @key_hash: a #GtkKeyHash
531 * @event: a #GtkEvent
533 * Looks up the best matching entry or entries in the hash table for a
534 * given keyval/modifiers pair. It's better to use
535 * _gtk_key_hash_lookup() if you have the original #GdkEventKey
536 * available. The results are sorted so that entries with less
537 * modifiers come before entries with more modifiers.
539 * Return value: A #GSList of all matching entries.
542 _gtk_key_hash_lookup_keyval (GtkKeyHash *key_hash,
544 GdkModifierType modifiers)
548 GSList *results = NULL;
551 if (!keyval) /* Key without symbol */
554 /* Find some random keycode for this keyval
556 gdk_keymap_get_entries_for_keyval (key_hash->keymap, keyval,
561 GHashTable *keycode_hash = key_hash_get_keycode_hash (key_hash);
562 GSList *entries = g_hash_table_lookup (keycode_hash, GUINT_TO_POINTER (keys[0].keycode));
566 GtkKeyHashEntry *entry = entries->data;
568 if (entry->keyval == keyval && entry->modifiers == modifiers)
569 results = g_slist_prepend (results, entry);
571 entries = entries->next;
577 results = sort_lookup_results (results);
578 for (l = results; l; l = l->next)
579 l->data = ((GtkKeyHashEntry *)l->data)->value;