/* gtkkeyhash.c: Keymap aware matching of key bindings
*
* GTK - The GIMP Toolkit
* Copyright (C) 2002, Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "gtkdebug.h"
#include "gtkkeyhash.h"
#include "gtkprivate.h"
#include "gtkalias.h"
typedef struct _GtkKeyHashEntry GtkKeyHashEntry;
struct _GtkKeyHashEntry
{
guint keyval;
GdkModifierType modifiers;
gpointer value;
/* Set as a side effect of generating key_hash->keycode_hash
*/
GdkKeymapKey *keys;
gint n_keys;
};
struct _GtkKeyHash
{
GdkKeymap *keymap;
GHashTable *keycode_hash;
GHashTable *reverse_hash;
GList *entries_list;
GDestroyNotify destroy_notify;
};
static void
key_hash_clear_keycode (gpointer key,
gpointer value,
gpointer data)
{
GSList *keys = value;
g_slist_free (keys);
}
static void
key_hash_insert_entry (GtkKeyHash *key_hash,
GtkKeyHashEntry *entry)
{
gint i;
g_free (entry->keys);
gdk_keymap_get_entries_for_keyval (key_hash->keymap,
entry->keyval,
&entry->keys, &entry->n_keys);
for (i = 0; i < entry->n_keys; i++)
{
GSList *old_keys = g_hash_table_lookup (key_hash->keycode_hash,
GUINT_TO_POINTER (entry->keys[i].keycode));
old_keys = g_slist_prepend (old_keys, entry);
g_hash_table_insert (key_hash->keycode_hash,
GUINT_TO_POINTER (entry->keys[i].keycode),
old_keys);
}
}
static GHashTable *
key_hash_get_keycode_hash (GtkKeyHash *key_hash)
{
if (!key_hash->keycode_hash)
{
GList *tmp_list;
key_hash->keycode_hash = g_hash_table_new (g_direct_hash, NULL);
/* Preserve the original insertion order
*/
for (tmp_list = g_list_last (key_hash->entries_list);
tmp_list;
tmp_list = tmp_list->prev)
key_hash_insert_entry (key_hash, tmp_list->data);
}
return key_hash->keycode_hash;
}
static void
key_hash_keys_changed (GdkKeymap *keymap,
GtkKeyHash *key_hash)
{
/* The keymap changed, so we have to regenerate the keycode hash
*/
if (key_hash->keycode_hash)
{
g_hash_table_foreach (key_hash->keycode_hash, key_hash_clear_keycode, NULL);
g_hash_table_destroy (key_hash->keycode_hash);
key_hash->keycode_hash = NULL;
}
}
/**
* _gtk_key_hash_new:
* @keymap: a #GdkKeymap
* @item_destroy_notify: function to be called when items are removed
* from the hash or %NULL.
*
* Create a new key hash object for doing binding resolution.
*
* Return value: the newly created object. Free with _gtk_key_hash_free().
**/
GtkKeyHash *
_gtk_key_hash_new (GdkKeymap *keymap,
GDestroyNotify item_destroy_notify)
{
GtkKeyHash *key_hash = g_new (GtkKeyHash, 1);
key_hash->keymap = keymap;
g_signal_connect (keymap, "keys-changed",
G_CALLBACK (key_hash_keys_changed), key_hash);
key_hash->entries_list = NULL;
key_hash->keycode_hash = NULL;
key_hash->reverse_hash = g_hash_table_new (g_direct_hash, NULL);
key_hash->destroy_notify = item_destroy_notify;
return key_hash;
}
static void
key_hash_free_entry (GtkKeyHash *key_hash,
GtkKeyHashEntry *entry)
{
if (key_hash->destroy_notify)
(*key_hash->destroy_notify) (entry->value);
g_free (entry->keys);
g_slice_free (GtkKeyHashEntry, entry);
}
static void
key_hash_free_entry_foreach (gpointer value,
gpointer data)
{
GtkKeyHashEntry *entry = value;
GtkKeyHash *key_hash = data;
key_hash_free_entry (key_hash, entry);
}
/**
* gtk_key_hash_free:
* @key_hash: a #GtkKeyHash
*
* Destroys a key hash created with gtk_key_hash_new()
**/
void
_gtk_key_hash_free (GtkKeyHash *key_hash)
{
g_signal_handlers_disconnect_by_func (key_hash->keymap,
key_hash_keys_changed,
key_hash);
if (key_hash->keycode_hash)
{
g_hash_table_foreach (key_hash->keycode_hash, key_hash_clear_keycode, NULL);
g_hash_table_destroy (key_hash->keycode_hash);
}
g_hash_table_destroy (key_hash->reverse_hash);
g_list_foreach (key_hash->entries_list, key_hash_free_entry_foreach, key_hash);
g_list_free (key_hash->entries_list);
g_free (key_hash);
}
/**
* _gtk_key_hash_add_entry:
* @key_hash: a #GtkKeyHash
* @keyval: key symbol for this binding
* @modifiers: modifiers for this binding
* @value: value to insert in the key hash
*
* Inserts a pair of key symbol and modifier mask into the key hash.
**/
void
_gtk_key_hash_add_entry (GtkKeyHash *key_hash,
guint keyval,
GdkModifierType modifiers,
gpointer value)
{
GtkKeyHashEntry *entry = g_slice_new (GtkKeyHashEntry);
entry->value = value;
entry->keyval = keyval;
entry->modifiers = modifiers;
entry->keys = NULL;
key_hash->entries_list = g_list_prepend (key_hash->entries_list, entry);
g_hash_table_insert (key_hash->reverse_hash, value, key_hash->entries_list);
if (key_hash->keycode_hash)
key_hash_insert_entry (key_hash, entry);
}
/**
* _gtk_key_hash_remove_entry:
* @key_hash: a #GtkKeyHash
* @value: value previously added with _gtk_key_hash_add_entry()
*
* Removes a value previously added to the key hash with
* _gtk_key_hash_add_entry().
**/
void
_gtk_key_hash_remove_entry (GtkKeyHash *key_hash,
gpointer value)
{
GList *entry_node = g_hash_table_lookup (key_hash->reverse_hash, value);
if (entry_node)
{
GtkKeyHashEntry *entry = entry_node->data;
if (key_hash->keycode_hash)
{
gint i;
for (i = 0; i < entry->n_keys; i++)
{
GSList *old_keys = g_hash_table_lookup (key_hash->keycode_hash,
GUINT_TO_POINTER (entry->keys[i].keycode));
GSList *new_keys = g_slist_remove (old_keys, entry);
if (new_keys != old_keys)
{
if (new_keys)
g_hash_table_insert (key_hash->keycode_hash,
GUINT_TO_POINTER (entry->keys[i].keycode),
new_keys);
else
g_hash_table_remove (key_hash->keycode_hash,
GUINT_TO_POINTER (entry->keys[i].keycode));
}
}
}
g_hash_table_remove (key_hash->reverse_hash, entry_node);
key_hash->entries_list = g_list_delete_link (key_hash->entries_list, entry_node);
key_hash_free_entry (key_hash, entry);
}
}
static gint
lookup_result_compare (gconstpointer a,
gconstpointer b)
{
const GtkKeyHashEntry *entry_a = a;
const GtkKeyHashEntry *entry_b = b;
guint modifiers;
gint n_bits_a = 0;
gint n_bits_b = 0;
modifiers = entry_a->modifiers;
while (modifiers)
{
if (modifiers & 1)
n_bits_a++;
modifiers >>= 1;
}
modifiers = entry_b->modifiers;
while (modifiers)
{
if (modifiers & 1)
n_bits_b++;
modifiers >>= 1;
}
return n_bits_a < n_bits_b ? -1 : (n_bits_a == n_bits_b ? 0 : 1);
}
/* Sort a list of results so that matches with less modifiers come
* before matches with more modifiers
*/
static GSList *
sort_lookup_results (GSList *slist)
{
return g_slist_sort (slist, lookup_result_compare);
}
static gint
lookup_result_compare_by_keyval (gconstpointer a,
gconstpointer b)
{
const GtkKeyHashEntry *entry_a = a;
const GtkKeyHashEntry *entry_b = b;
if (entry_a->keyval < entry_b->keyval)
return -1;
else if (entry_a->keyval > entry_b->keyval)
return 1;
else
return 0;
}
static GSList *
sort_lookup_results_by_keyval (GSList *slist)
{
return g_slist_sort (slist, lookup_result_compare_by_keyval);
}
/* Return true if keyval is defined in keyboard group
*/
static gboolean
keyval_in_group (GdkKeymap *keymap,
guint keyval,
gint group)
{
GtkKeyHashEntry entry;
gint i;
gdk_keymap_get_entries_for_keyval (keymap,
keyval,
&entry.keys, &entry.n_keys);
for (i = 0; i < entry.n_keys; i++)
{
if (entry.keys[i].group == group)
{
g_free (entry.keys);
return TRUE;
}
}
g_free (entry.keys);
return FALSE;
}
/**
* _gtk_key_hash_lookup:
* @key_hash: a #GtkKeyHash
* @hardware_keycode: hardware keycode field from a #GdkEventKey
* @state: state field from a #GdkEventKey
* @mask: mask of modifiers to consider when matching against the
* modifiers in entries.
* @group: group field from a #GdkEventKey
*
* Looks up the best matching entry or entries in the hash table for
* a given event. The results are sorted so that entries with less
* modifiers come before entries with more modifiers.
*
* The matches returned by this function can be exact (i.e. keycode, level
* and group all match) or fuzzy (i.e. keycode and level match, but group
* does not). As long there are any exact matches, only exact matches
* are returned. If there are no exact matches, fuzzy matches will be
* returned, as long as they are not shadowing a possible exact match.
* This means that fuzzy matches won't be considered if their keyval is
* present in the current group.
*
* Return value: A #GSList of matching entries.
**/
GSList *
_gtk_key_hash_lookup (GtkKeyHash *key_hash,
guint16 hardware_keycode,
GdkModifierType state,
GdkModifierType mask,
gint group)
{
GHashTable *keycode_hash = key_hash_get_keycode_hash (key_hash);
GSList *keys = g_hash_table_lookup (keycode_hash, GUINT_TO_POINTER ((guint)hardware_keycode));
GSList *results = NULL;
GSList *l;
gboolean have_exact = FALSE;
guint keyval;
gint effective_group;
gint level;
GdkModifierType modifiers;
GdkModifierType consumed_modifiers;
gboolean group_mod_is_accel_mod = FALSE;
const GdkModifierType xmods = GDK_MOD2_MASK|GDK_MOD3_MASK|GDK_MOD4_MASK|GDK_MOD5_MASK;
const GdkModifierType vmods = GDK_SUPER_MASK|GDK_HYPER_MASK|GDK_META_MASK;
/* We don't want Caps_Lock to affect keybinding lookups.
*/
state &= ~GDK_LOCK_MASK;
_gtk_translate_keyboard_accel_state (key_hash->keymap,
hardware_keycode, state, mask, group,
&keyval,
&effective_group, &level, &consumed_modifiers);
/* if the group-toggling modifier is part of the default accel mod
* mask, and it is active, disable it for matching
*/
if (mask & GTK_TOGGLE_GROUP_MOD_MASK)
group_mod_is_accel_mod = TRUE;
gdk_keymap_map_virtual_modifiers (key_hash->keymap, &mask);
gdk_keymap_add_virtual_modifiers (key_hash->keymap, &state);
GTK_NOTE (KEYBINDINGS,
g_message ("Looking up keycode = %u, modifiers = 0x%04x,\n"
" keyval = %u, group = %d, level = %d, consumed_modifiers = 0x%04x",
hardware_keycode, state, keyval, effective_group, level, consumed_modifiers));
if (keys)
{
GSList *tmp_list = keys;
while (tmp_list)
{
GtkKeyHashEntry *entry = tmp_list->data;
/* If the virtual Super, Hyper or Meta modifiers are present,
* they will also be mapped to some of the Mod2 - Mod5 modifiers,
* so we compare them twice, ignoring either set.
* We accept combinations involving virtual modifiers only if they
* are mapped to separate modifiers; i.e. if Super and Hyper are
* both mapped to Mod4, then pressing a key that is mapped to Mod4
* will not match a Super+Hyper entry.
*/
modifiers = entry->modifiers;
if (gdk_keymap_map_virtual_modifiers (key_hash->keymap, &modifiers) &&
((modifiers & ~consumed_modifiers & mask & ~vmods) == (state & ~consumed_modifiers & mask & ~vmods) ||
(modifiers & ~consumed_modifiers & mask & ~xmods) == (state & ~consumed_modifiers & mask & ~xmods)))
{
gint i;
if (keyval == entry->keyval && /* Exact match */
/* but also match for group if it is an accel mod, because
* otherwise we can get multiple exact matches, some being
* bogus */
(!group_mod_is_accel_mod ||
(state & GTK_TOGGLE_GROUP_MOD_MASK) ==
(entry->modifiers & GTK_TOGGLE_GROUP_MOD_MASK)))
{
GTK_NOTE (KEYBINDINGS,
g_message (" found exact match, keyval = %u, modifiers = 0x%04x",
entry->keyval, entry->modifiers));
if (!have_exact)
{
g_slist_free (results);
results = NULL;
}
have_exact = TRUE;
results = g_slist_prepend (results, entry);
}
if (!have_exact)
{
for (i = 0; i < entry->n_keys; i++)
{
if (entry->keys[i].keycode == hardware_keycode &&
entry->keys[i].level == level &&
/* Only match for group if it's an accel mod */
(!group_mod_is_accel_mod ||
entry->keys[i].group == effective_group))
{
GTK_NOTE (KEYBINDINGS,
g_message (" found group = %d, level = %d",
entry->keys[i].group, entry->keys[i].level));
results = g_slist_prepend (results, entry);
break;
}
}
}
}
tmp_list = tmp_list->next;
}
}
if (!have_exact && results)
{
/* If there are fuzzy matches, check that the current group doesn't also
* define these keyvals; if yes, discard results because a widget up in
* the stack may have an exact match and we don't want to 'steal' it.
*/
guint oldkeyval = 0;
GtkKeyHashEntry *keyhashentry;
results = sort_lookup_results_by_keyval (results);
for (l = results; l; l = l->next)
{
keyhashentry = l->data;
if (l == results || oldkeyval != keyhashentry->keyval)
{
oldkeyval = keyhashentry->keyval;
if (keyval_in_group (key_hash->keymap, oldkeyval, group))
{
g_slist_free (results);
return NULL;
}
}
}
}
results = sort_lookup_results (results);
for (l = results; l; l = l->next)
l->data = ((GtkKeyHashEntry *)l->data)->value;
return results;
}
/**
* _gtk_key_hash_lookup_keyval:
* @key_hash: a #GtkKeyHash
* @event: a #GtkEvent
*
* Looks up the best matching entry or entries in the hash table for a
* given keyval/modifiers pair. It's better to use
* _gtk_key_hash_lookup() if you have the original #GdkEventKey
* available. The results are sorted so that entries with less
* modifiers come before entries with more modifiers.
*
* Return value: A #GSList of all matching entries.
**/
GSList *
_gtk_key_hash_lookup_keyval (GtkKeyHash *key_hash,
guint keyval,
GdkModifierType modifiers)
{
GdkKeymapKey *keys;
gint n_keys;
GSList *results = NULL;
GSList *l;
if (!keyval) /* Key without symbol */
return NULL;
/* Find some random keycode for this keyval
*/
gdk_keymap_get_entries_for_keyval (key_hash->keymap, keyval,
&keys, &n_keys);
if (n_keys)
{
GHashTable *keycode_hash = key_hash_get_keycode_hash (key_hash);
GSList *entries = g_hash_table_lookup (keycode_hash, GUINT_TO_POINTER (keys[0].keycode));
while (entries)
{
GtkKeyHashEntry *entry = entries->data;
if (entry->keyval == keyval && entry->modifiers == modifiers)
results = g_slist_prepend (results, entry);
entries = entries->next;
}
}
g_free (keys);
results = sort_lookup_results (results);
for (l = results; l; l = l->next)
l->data = ((GtkKeyHashEntry *)l->data)->value;
return results;
}