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.
22 #include "gtkkeyhash.h"
24 /* We need to add a ::changed signal to GdkKeyMap to properly deal
25 * with changes to the key map while we are running.
27 #undef HAVE_CHANGED_SIGNAL
29 typedef struct _GtkKeyHashEntry GtkKeyHashEntry;
31 struct _GtkKeyHashEntry
34 GdkModifierType modifiers;
43 GHashTable *keycode_hash;
44 GHashTable *reverse_hash;
45 GDestroyNotify destroy_notify;
49 key_hash_clear_keycode (gpointer key,
58 key_hash_insert_entry (GtkKeyHash *key_hash,
59 GtkKeyHashEntry *entry)
63 gdk_keymap_get_entries_for_keyval (key_hash->keymap,
65 &entry->keys, &entry->n_keys);
67 for (i = 0; i < entry->n_keys; i++)
69 GSList *old_keys = g_hash_table_lookup (key_hash->keycode_hash,
70 GUINT_TO_POINTER (entry->keys[i].keycode));
71 old_keys = g_slist_prepend (old_keys, entry);
72 g_hash_table_insert (key_hash->keycode_hash,
73 GUINT_TO_POINTER (entry->keys[i].keycode),
78 #ifdef HAVE_CHANGED_SIGNAL
80 key_hash_reinsert_entry (gpointer key,
84 GtkKeyHashEntry *entry = value;
85 GtkKeyHash *key_hash = data;
88 key_hash_insert_entry (key_hash, entry);
92 key_hash_keymap_changed (GdkKeymap *keymap,
95 /* The keymap changed, so we have to clear and reinsert all our entries
97 g_hash_table_foreach (key_hash->keycode_hash, key_hash_clear_keycode, NULL);
99 /* FIXME: Here we reinsert in random order, but I think we actually have to
100 * insert in the same order as the original order to keep GtkBindingSet happy.
102 g_hash_table_foreach (key_hash->reverse_hash, key_hash_reinsert_entry, key_hash);
104 #endif /* HAVE_CHANGED_SIGNAL */
108 * @keymap: a #GdkKeymap
109 * @item_destroy_notify: function to be called when items are removed
110 * from the hash or %NULL.
112 * Create a new key hash object for doing binding resolution.
114 * Return value: the newly created object. Free with _gtk_key_hash_free().
117 _gtk_key_hash_new (GdkKeymap *keymap,
118 GDestroyNotify item_destroy_notify)
120 GtkKeyHash *key_hash = g_new (GtkKeyHash, 1);
122 key_hash->keymap = keymap;
123 #ifdef HAVE_CHANGED_SIGNAL
124 g_signal_connect (keymap, "changed",
125 G_CALLBACK (key_hash_keymap_changed), key_hash);
128 key_hash->keycode_hash = g_hash_table_new (g_direct_hash, NULL);
129 key_hash->reverse_hash = g_hash_table_new (g_direct_hash, NULL);
130 key_hash->destroy_notify = item_destroy_notify;
136 key_hash_free_entry (GtkKeyHash *key_hash,
137 GtkKeyHashEntry *entry)
139 if (key_hash->destroy_notify)
140 (*key_hash->destroy_notify) (entry->value);
142 g_free (entry->keys);
147 key_hash_free_entry_foreach (gpointer key,
151 GtkKeyHashEntry *entry = value;
152 GtkKeyHash *key_hash = data;
154 key_hash_free_entry (key_hash, entry);
159 * @key_hash: a #GtkKeyHash
161 * Destroys a key hash created with gtk_key_hash_new()
164 _gtk_key_hash_free (GtkKeyHash *key_hash)
166 #if HAVE_CHANGED_SIGNAL
167 g_signal_handlers_disconnect_by_func (key_hash->keymap,
168 G_CALLBACK (key_hash_keymap_changed), key_hash);
171 g_hash_table_foreach (key_hash->keycode_hash, key_hash_clear_keycode, NULL);
172 g_hash_table_foreach (key_hash->reverse_hash, key_hash_free_entry_foreach, key_hash);
173 g_hash_table_destroy (key_hash->keycode_hash);
174 g_hash_table_destroy (key_hash->reverse_hash);
180 * _gtk_key_hash_add_entry:
181 * @key_hash: a #GtkKeyHash
182 * @keyval: key symbol for this binding
183 * @modifiers: modifiers for this binding
184 * @value: value to insert in the key hash
186 * Inserts a pair of key symbol and modifier mask into the key hash.
189 _gtk_key_hash_add_entry (GtkKeyHash *key_hash,
191 GdkModifierType modifiers,
194 GtkKeyHashEntry *entry = g_new (GtkKeyHashEntry, 1);
196 entry->value = value;
197 entry->keyval = keyval;
198 entry->modifiers = modifiers;
200 g_hash_table_insert (key_hash->reverse_hash, value, entry);
201 key_hash_insert_entry (key_hash, entry);
205 * _gtk_key_hash_remove_entry:
206 * @key_hash: a #GtkKeyHash
207 * @value: value previously added with _gtk_key_hash_add_entry()
209 * Removes a value previously added to the key hash with
210 * _gtk_key_hash_add_entry().
213 _gtk_key_hash_remove_entry (GtkKeyHash *key_hash,
216 GtkKeyHashEntry *entry = g_hash_table_lookup (key_hash->reverse_hash, value);
221 for (i = 0; i < entry->n_keys; i++)
223 GSList *old_keys = g_hash_table_lookup (key_hash->keycode_hash,
224 GUINT_TO_POINTER (entry->keys[i].keycode));
226 GSList *new_keys = g_slist_remove (old_keys, entry);
227 if (new_keys != old_keys)
230 g_hash_table_insert (key_hash->keycode_hash,
231 GUINT_TO_POINTER (entry->keys[i].keycode),
234 g_hash_table_remove (key_hash->keycode_hash,
235 GUINT_TO_POINTER (entry->keys[i].keycode));
239 g_hash_table_remove (key_hash->reverse_hash, value);
241 key_hash_free_entry (key_hash, entry);
246 lookup_result_compare (gconstpointer a,
249 const GtkKeyHashEntry *entry_a = a;
250 const GtkKeyHashEntry *entry_b = b;
256 modifiers = entry_a->modifiers;
264 modifiers = entry_b->modifiers;
272 return n_bits_a < n_bits_b ? -1 : (n_bits_a == n_bits_b ? 0 : 1);
276 /* Sort a list of results so that matches with less modifiers come
277 * before matches with more modifiers
280 sort_lookup_results (GSList *slist)
282 return g_slist_sort (slist, lookup_result_compare);
286 * _gtk_key_hash_lookup:
287 * @key_hash: a #GtkKeyHash
288 * @hardware_keycode: hardware keycode field from a #GdkEventKey
289 * @state: state field from a #GdkEventKey
290 * @group: group field from a #GdkEventKey
292 * Looks up the best matching entry or entries in the hash table for
293 * a given event. The results are sorted so that entries with less
294 * modifiers come before entries with more modifiers.
296 * Return value: A #GSList of all matching entries. If there were exact
297 * matches, they are returned, otherwise all fuzzy matches are
298 * returned. (A fuzzy match is a match in keycode and level, but not
302 _gtk_key_hash_lookup (GtkKeyHash *key_hash,
303 guint16 hardware_keycode,
304 GdkModifierType state,
307 GSList *keys = g_hash_table_lookup (key_hash->keycode_hash, GUINT_TO_POINTER ((guint)hardware_keycode));
308 GSList *results = NULL;
309 gboolean have_exact = FALSE;
311 gint effective_group;
313 GdkModifierType consumed_modifiers;
315 gdk_keymap_translate_keyboard_state (key_hash->keymap,
316 hardware_keycode, state, group,
317 &keyval, &effective_group, &level, &consumed_modifiers);
319 GTK_NOTE (KEYBINDINGS,
320 g_message ("Looking up keycode = %u, modifiers = 0x%04x,\n"
321 " keyval = %u, group = %d, level = %d, consumed_modifiers = 0x%04x",
322 hardware_keycode, state, keyval, effective_group, level, consumed_modifiers));
326 GSList *tmp_list = keys;
329 GtkKeyHashEntry *entry = tmp_list->data;
331 if ((entry->modifiers & ~consumed_modifiers) == (state & ~consumed_modifiers))
335 if (keyval == entry->keyval) /* Exact match */
337 GTK_NOTE (KEYBINDINGS,
338 g_message (" found exact match, keyval = %u, modifiers = 0x%04x",
339 entry->keyval, entry->modifiers));
343 g_slist_free (results);
348 results = g_slist_prepend (results, entry->value);
353 for (i = 0; i < entry->n_keys; i++)
355 if (entry->keys[i].keycode == hardware_keycode &&
356 entry->keys[i].level == level) /* Match for all but group */
358 GTK_NOTE (KEYBINDINGS,
359 g_message (" found group = %d, level = %d",
360 entry->keys[i].group, entry->keys[i].level));
361 results = g_slist_prepend (results, entry->value);
368 tmp_list = tmp_list->next;
372 return sort_lookup_results (results);
376 * _gtk_key_hash_lookup_keyval:
377 * @key_hash: a #GtkKeyHash
378 * @event: a #GtkEvent
380 * Looks up the best matching entry or entries in the hash table for a
381 * given keyval/modifiers pair. It's better to use
382 * _gtk_key_hash_lookup() if you have the original #GdkEventKey
383 * available. The results are sorted so that entries with less
384 * modifiers come before entries with more modifiers.
386 * Return value: A #GSList of all matching entries.
389 _gtk_key_hash_lookup_keyval (GtkKeyHash *key_hash,
391 GdkModifierType modifiers)
395 GSList *results = NULL;
397 if (!keyval) /* Key without symbol */
400 /* Find some random keycode for this keycode
402 gdk_keymap_get_entries_for_keyval (key_hash->keymap, keyval,
407 GSList *entries = g_hash_table_lookup (key_hash->keycode_hash, GUINT_TO_POINTER (keys[0].keycode));
411 GtkKeyHashEntry *entry = entries->data;
413 if (entry->keyval == keyval && entry->modifiers == modifiers)
414 results = g_slist_prepend (results, entry->value);
416 entries = entries->next;
422 return sort_lookup_results (results);