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gtk2/gtk/gtkbindings.c
Daniel Boles 7dd3349751 bindings: Avoid iterating array if it is never set 
If query.return_type is not one we want, binding_compose_params() is
not called, and so params remains a NULL pointer. However, the code was
then unconditionally iterating it regardless. Don't if it is still NULL.

CID 1452218 (#1 of 1): Explicit null dereferenced (FORWARD_NULL)
15. var_deref_op: Dereferencing null pointer params.
2017-08-01 20:41:23 +01:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* GtkBindingSet: Keybinding manager for GObjects.
* Copyright (C) 1998 Tim Janik
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include <string.h>
#include <stdarg.h>
#include "gtkbindingsprivate.h"
#include "gtkkeyhash.h"
#include "gtkstylecontext.h"
#include "gtkwidget.h"
#include "gtkintl.h"
/**
* SECTION:gtkbindings
* @Title: Bindings
* @Short_description: Key bindings for individual widgets
* @See_also: Keyboard Accelerators, Mnemonics, #GtkCssProvider
*
* #GtkBindingSet provides a mechanism for configuring GTK+ key bindings
* through CSS files. This eases key binding adjustments for application
* developers as well as users and provides GTK+ users or administrators
* with high key binding configurability which requires no application
* or toolkit side changes.
*
* In order for bindings to work in a custom widget implementation, the
* widget’s #GtkWidget:can-focus and #GtkWidget:has-focus properties
* must both be true. For example, by calling gtk_widget_set_can_focus()
* in the widget’s initialisation function; and by calling
* gtk_widget_grab_focus() when the widget is clicked.
*
* # Installing a key binding
*
* A CSS file binding consists of a “binding-set” definition and a match
* statement to apply the binding set to specific widget types. Details
* on the matching mechanism are described under
* [Selectors][gtkcssprovider-selectors]
* in the #GtkCssProvider documentation. Inside the binding set
* definition, key combinations are bound to one or more specific
* signal emissions on the target widget. Key combinations are strings
* consisting of an optional #GdkModifierType name and
* [key names][gdk3-Keyboard-Handling]
* such as those defined in `gdk/gdkkeysyms.h`
* or returned from gdk_keyval_name(), they have to be parsable by
* gtk_accelerator_parse(). Specifications of signal emissions consist
* of a string identifying the signal name, and a list of signal specific
* arguments in parenthesis.
*
* For example for binding Control and the left or right cursor keys
* of a #GtkEntry widget to the #GtkEntry::move-cursor signal (so
* movement occurs in 3-character steps), the following binding can be
* used:
*
* |[ <!-- language="CSS" -->
* @binding-set MoveCursor3
* {
* bind "<Control>Right" { "move-cursor" (visual-positions, 3, 0) };
* bind "<Control>Left" { "move-cursor" (visual-positions, -3, 0) };
* }
*
* entry
* {
* -gtk-key-bindings: MoveCursor3;
* }
* ]|
*
* # Unbinding existing key bindings
*
* GTK+ already defines a number of useful bindings for the widgets
* it provides. Because custom bindings set up in CSS files take
* precedence over the default bindings shipped with GTK+, overriding
* existing bindings as demonstrated in
* [Installing a key binding][gtk-bindings-install]
* works as expected. The same mechanism can not be used to “unbind”
* existing bindings, however.
*
* |[ <!-- language="CSS" -->
* @binding-set MoveCursor3
* {
* bind "<Control>Right" { };
* bind "<Control>Left" { };
* }
*
* entry
* {
* -gtk-key-bindings: MoveCursor3;
* }
* ]|
*
* The above example will not have the desired effect of causing
* “<Control>Right” and “<Control>Left” key presses to be ignored by GTK+.
* Instead, it just causes any existing bindings from the bindings set
* “MoveCursor3” to be deleted, so when “<Control>Right” or
* “<Control>Left” are pressed, no binding for these keys is found in
* binding set “MoveCursor3”. GTK+ will thus continue to search for
* matching key bindings, and will eventually lookup and find the default
* GTK+ bindings for entries which implement word movement. To keep GTK+
* from activating its default bindings, the “unbind” keyword can be used
* like this:
*
* |[ <!-- language="CSS" -->
* @binding-set MoveCursor3
* {
* unbind "<Control>Right";
* unbind "<Control>Left";
* }
*
* entry
* {
* -gtk-key-bindings: MoveCursor3;
* }
* ]|
*
* Now, GTK+ will find a match when looking up “<Control>Right” and
* “<Control>Left” key presses before it resorts to its default bindings,
* and the match instructs it to abort (“unbind”) the search, so the key
* presses are not consumed by this widget. As usual, further processing
* of the key presses, e.g. by an entry’s parent widget, is now possible.
*/
/* --- defines --- */
#define BINDING_MOD_MASK() (gtk_accelerator_get_default_mod_mask () | GDK_RELEASE_MASK)
#define GTK_TYPE_IDENTIFIER (gtk_identifier_get_type ())
_GDK_EXTERN
GType gtk_identifier_get_type (void) G_GNUC_CONST;
/* --- structures --- */
typedef enum {
GTK_BINDING_TOKEN_BIND,
GTK_BINDING_TOKEN_UNBIND
} GtkBindingTokens;
/* --- variables --- */
static GHashTable *binding_entry_hash_table = NULL;
static GSList *binding_key_hashes = NULL;
static GSList *binding_set_list = NULL;
static const gchar key_class_binding_set[] = "gtk-class-binding-set";
static GQuark key_id_class_binding_set = 0;
/* --- functions --- */
GType
gtk_identifier_get_type (void)
{
static GType our_type = 0;
if (our_type == 0)
{
GTypeInfo tinfo = { 0, };
our_type = g_type_register_static (G_TYPE_STRING, I_("GtkIdentifier"), &tinfo, 0);
}
return our_type;
}
static GtkBindingSignal*
binding_signal_new (const gchar *signal_name,
guint n_args)
{
GtkBindingSignal *signal;
signal = (GtkBindingSignal *) g_slice_alloc0 (sizeof (GtkBindingSignal) + n_args * sizeof (GtkBindingArg));
signal->next = NULL;
signal->signal_name = (gchar *)g_intern_string (signal_name);
signal->n_args = n_args;
signal->args = (GtkBindingArg *)(signal + 1);
return signal;
}
static void
binding_signal_free (GtkBindingSignal *sig)
{
guint i;
for (i = 0; i < sig->n_args; i++)
{
if (G_TYPE_FUNDAMENTAL (sig->args[i].arg_type) == G_TYPE_STRING)
g_free (sig->args[i].d.string_data);
}
g_slice_free1 (sizeof (GtkBindingSignal) + sig->n_args * sizeof (GtkBindingArg), sig);
}
static guint
binding_entry_hash (gconstpointer key)
{
register const GtkBindingEntry *e = key;
register guint h;
h = e->keyval;
h ^= e->modifiers;
return h;
}
static gint
binding_entries_compare (gconstpointer a,
gconstpointer b)
{
register const GtkBindingEntry *ea = a;
register const GtkBindingEntry *eb = b;
return (ea->keyval == eb->keyval && ea->modifiers == eb->modifiers);
}
static void
binding_key_hash_insert_entry (GtkKeyHash *key_hash,
GtkBindingEntry *entry)
{
guint keyval = entry->keyval;
/* We store lowercased accelerators. To deal with this, if <Shift>
* was specified, uppercase.
*/
if (entry->modifiers & GDK_SHIFT_MASK)
{
if (keyval == GDK_KEY_Tab)
keyval = GDK_KEY_ISO_Left_Tab;
else
keyval = gdk_keyval_to_upper (keyval);
}
_gtk_key_hash_add_entry (key_hash, keyval, entry->modifiers & ~GDK_RELEASE_MASK, entry);
}
static void
binding_key_hash_destroy (gpointer data)
{
GtkKeyHash *key_hash = data;
binding_key_hashes = g_slist_remove (binding_key_hashes, key_hash);
_gtk_key_hash_free (key_hash);
}
static void
insert_entries_into_key_hash (gpointer key,
gpointer value,
gpointer data)
{
GtkKeyHash *key_hash = data;
GtkBindingEntry *entry = value;
for (; entry; entry = entry->hash_next)
binding_key_hash_insert_entry (key_hash, entry);
}
static GtkKeyHash *
binding_key_hash_for_keymap (GdkKeymap *keymap)
{
static GQuark key_hash_quark = 0;
GtkKeyHash *key_hash;
if (!key_hash_quark)
key_hash_quark = g_quark_from_static_string ("gtk-binding-key-hash");
key_hash = g_object_get_qdata (G_OBJECT (keymap), key_hash_quark);
if (!key_hash)
{
key_hash = _gtk_key_hash_new (keymap, NULL);
g_object_set_qdata_full (G_OBJECT (keymap), key_hash_quark, key_hash, binding_key_hash_destroy);
if (binding_entry_hash_table)
g_hash_table_foreach (binding_entry_hash_table,
insert_entries_into_key_hash,
key_hash);
binding_key_hashes = g_slist_prepend (binding_key_hashes, key_hash);
}
return key_hash;
}
static GtkBindingEntry*
binding_entry_new (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers)
{
GSList *tmp_list;
GtkBindingEntry *entry;
if (!binding_entry_hash_table)
binding_entry_hash_table = g_hash_table_new (binding_entry_hash, binding_entries_compare);
entry = g_new (GtkBindingEntry, 1);
entry->keyval = keyval;
entry->modifiers = modifiers;
entry->binding_set = binding_set,
entry->destroyed = FALSE;
entry->in_emission = FALSE;
entry->marks_unbound = FALSE;
entry->signals = NULL;
entry->set_next = binding_set->entries;
binding_set->entries = entry;
entry->hash_next = g_hash_table_lookup (binding_entry_hash_table, entry);
if (entry->hash_next)
g_hash_table_remove (binding_entry_hash_table, entry->hash_next);
g_hash_table_insert (binding_entry_hash_table, entry, entry);
for (tmp_list = binding_key_hashes; tmp_list; tmp_list = tmp_list->next)
{
GtkKeyHash *key_hash = tmp_list->data;
binding_key_hash_insert_entry (key_hash, entry);
}
return entry;
}
static void
binding_entry_free (GtkBindingEntry *entry)
{
GtkBindingSignal *sig;
g_assert (entry->set_next == NULL &&
entry->hash_next == NULL &&
entry->in_emission == FALSE &&
entry->destroyed == TRUE);
entry->destroyed = FALSE;
sig = entry->signals;
while (sig)
{
GtkBindingSignal *prev;
prev = sig;
sig = prev->next;
binding_signal_free (prev);
}
g_free (entry);
}
static void
binding_entry_destroy (GtkBindingEntry *entry)
{
GtkBindingEntry *o_entry;
register GtkBindingEntry *tmp;
GtkBindingEntry *begin;
register GtkBindingEntry *last;
GSList *tmp_list;
/* unlink from binding set
*/
last = NULL;
tmp = entry->binding_set->entries;
while (tmp)
{
if (tmp == entry)
{
if (last)
last->set_next = entry->set_next;
else
entry->binding_set->entries = entry->set_next;
break;
}
last = tmp;
tmp = last->set_next;
}
entry->set_next = NULL;
o_entry = g_hash_table_lookup (binding_entry_hash_table, entry);
begin = o_entry;
last = NULL;
tmp = begin;
while (tmp)
{
if (tmp == entry)
{
if (last)
last->hash_next = entry->hash_next;
else
begin = entry->hash_next;
break;
}
last = tmp;
tmp = last->hash_next;
}
entry->hash_next = NULL;
if (!begin)
g_hash_table_remove (binding_entry_hash_table, entry);
else if (begin != o_entry)
{
g_hash_table_remove (binding_entry_hash_table, entry);
g_hash_table_insert (binding_entry_hash_table, begin, begin);
}
for (tmp_list = binding_key_hashes; tmp_list; tmp_list = tmp_list->next)
{
GtkKeyHash *key_hash = tmp_list->data;
_gtk_key_hash_remove_entry (key_hash, entry);
}
entry->destroyed = TRUE;
if (!entry->in_emission)
binding_entry_free (entry);
}
static GtkBindingEntry*
binding_ht_lookup_entry (GtkBindingSet *set,
guint keyval,
GdkModifierType modifiers)
{
GtkBindingEntry lookup_entry = { 0 };
GtkBindingEntry *entry;
if (!binding_entry_hash_table)
return NULL;
lookup_entry.keyval = keyval;
lookup_entry.modifiers = modifiers;
entry = g_hash_table_lookup (binding_entry_hash_table, &lookup_entry);
for (; entry; entry = entry->hash_next)
if (entry->binding_set == set)
return entry;
return NULL;
}
static gboolean
binding_compose_params (GObject *object,
GtkBindingArg *args,
GSignalQuery *query,
GValue **params_p)
{
GValue *params;
const GType *types;
guint i;
gboolean valid;
params = g_new0 (GValue, query->n_params + 1);
*params_p = params;
/* The instance we emit on is the first object in the array
*/
g_value_init (params, G_TYPE_OBJECT);
g_value_set_object (params, G_OBJECT (object));
params++;
types = query->param_types;
valid = TRUE;
for (i = 1; i < query->n_params + 1 && valid; i++)
{
GValue tmp_value = G_VALUE_INIT;
g_value_init (params, *types);
switch (G_TYPE_FUNDAMENTAL (args->arg_type))
{
case G_TYPE_DOUBLE:
g_value_init (&tmp_value, G_TYPE_DOUBLE);
g_value_set_double (&tmp_value, args->d.double_data);
break;
case G_TYPE_LONG:
g_value_init (&tmp_value, G_TYPE_LONG);
g_value_set_long (&tmp_value, args->d.long_data);
break;
case G_TYPE_STRING:
/* gtk_rc_parse_flags/enum() has fancier parsing for this; we can't call
* that since we don't have a GParamSpec, so just do something simple
*/
if (G_TYPE_FUNDAMENTAL (*types) == G_TYPE_ENUM)
{
GEnumClass *class = G_ENUM_CLASS (g_type_class_ref (*types));
valid = FALSE;
if (args->arg_type == GTK_TYPE_IDENTIFIER)
{
GEnumValue *enum_value = NULL;
enum_value = g_enum_get_value_by_name (class, args->d.string_data);
if (!enum_value)
enum_value = g_enum_get_value_by_nick (class, args->d.string_data);
if (enum_value)
{
g_value_init (&tmp_value, *types);
g_value_set_enum (&tmp_value, enum_value->value);
valid = TRUE;
}
}
g_type_class_unref (class);
}
/* This is just a hack for compatibility with GTK+-1.2 where a string
* could be used for a single flag value / without the support for multiple
* values in gtk_rc_parse_flags(), this isn't very useful.
*/
else if (G_TYPE_FUNDAMENTAL (*types) == G_TYPE_FLAGS)
{
GFlagsClass *class = G_FLAGS_CLASS (g_type_class_ref (*types));
valid = FALSE;
if (args->arg_type == GTK_TYPE_IDENTIFIER)
{
GFlagsValue *flags_value = NULL;
flags_value = g_flags_get_value_by_name (class, args->d.string_data);
if (!flags_value)
flags_value = g_flags_get_value_by_nick (class, args->d.string_data);
if (flags_value)
{
g_value_init (&tmp_value, *types);
g_value_set_flags (&tmp_value, flags_value->value);
valid = TRUE;
}
}
g_type_class_unref (class);
}
else
{
g_value_init (&tmp_value, G_TYPE_STRING);
g_value_set_static_string (&tmp_value, args->d.string_data);
}
break;
default:
valid = FALSE;
break;
}
if (valid)
{
if (!g_value_transform (&tmp_value, params))
valid = FALSE;
g_value_unset (&tmp_value);
}
types++;
params++;
args++;
}
if (!valid)
{
guint j;
for (j = 0; j < i; j++)
g_value_unset (&(*params_p)[j]);
g_free (*params_p);
*params_p = NULL;
}
return valid;
}
static gboolean
gtk_binding_entry_activate (GtkBindingEntry *entry,
GObject *object)
{
GtkBindingSignal *sig;
gboolean old_emission;
gboolean handled = FALSE;
gint i;
old_emission = entry->in_emission;
entry->in_emission = TRUE;
g_object_ref (object);
for (sig = entry->signals; sig; sig = sig->next)
{
GSignalQuery query;
guint signal_id;
GValue *params = NULL;
GValue return_val = G_VALUE_INIT;
gchar *accelerator = NULL;
signal_id = g_signal_lookup (sig->signal_name, G_OBJECT_TYPE (object));
if (!signal_id)
{
accelerator = gtk_accelerator_name (entry->keyval, entry->modifiers);
g_warning ("gtk_binding_entry_activate(): binding \"%s::%s\": "
"could not find signal \"%s\" in the '%s' class ancestry",
entry->binding_set->set_name,
accelerator,
sig->signal_name,
g_type_name (G_OBJECT_TYPE (object)));
g_free (accelerator);
continue;
}
g_signal_query (signal_id, &query);
if (query.n_params != sig->n_args ||
(query.return_type != G_TYPE_NONE && query.return_type != G_TYPE_BOOLEAN) ||
!binding_compose_params (object, sig->args, &query, &params))
{
accelerator = gtk_accelerator_name (entry->keyval, entry->modifiers);
g_warning ("gtk_binding_entry_activate(): binding \"%s::%s\": "
"signature mismatch for signal \"%s\" in the '%s' class ancestry",
entry->binding_set->set_name,
accelerator,
sig->signal_name,
g_type_name (G_OBJECT_TYPE (object)));
}
else if (!(query.signal_flags & G_SIGNAL_ACTION))
{
accelerator = gtk_accelerator_name (entry->keyval, entry->modifiers);
g_warning ("gtk_binding_entry_activate(): binding \"%s::%s\": "
"signal \"%s\" in the '%s' class ancestry cannot be used for action emissions",
entry->binding_set->set_name,
accelerator,
sig->signal_name,
g_type_name (G_OBJECT_TYPE (object)));
}
g_free (accelerator);
if (accelerator)
continue;
if (query.return_type == G_TYPE_BOOLEAN)
g_value_init (&return_val, G_TYPE_BOOLEAN);
g_signal_emitv (params, signal_id, 0, &return_val);
if (query.return_type == G_TYPE_BOOLEAN)
{
if (g_value_get_boolean (&return_val))
handled = TRUE;
g_value_unset (&return_val);
}
else
handled = TRUE;
if (params != NULL)
{
for (i = 0; i < query.n_params + 1; i++)
g_value_unset (&params[i]);
g_free (params);
}
if (entry->destroyed)
break;
}
g_object_unref (object);
entry->in_emission = old_emission;
if (entry->destroyed && !entry->in_emission)
binding_entry_free (entry);
return handled;
}
/**
* gtk_binding_set_new: (skip)
* @set_name: unique name of this binding set
*
* GTK+ maintains a global list of binding sets. Each binding set has
* a unique name which needs to be specified upon creation.
*
* Returns: (transfer none): new binding set
*/
GtkBindingSet*
gtk_binding_set_new (const gchar *set_name)
{
GtkBindingSet *binding_set;
g_return_val_if_fail (set_name != NULL, NULL);
binding_set = g_new (GtkBindingSet, 1);
binding_set->set_name = (gchar *) g_intern_string (set_name);
binding_set->widget_path_pspecs = NULL;
binding_set->widget_class_pspecs = NULL;
binding_set->class_branch_pspecs = NULL;
binding_set->entries = NULL;
binding_set->current = NULL;
binding_set->parsed = FALSE;
binding_set_list = g_slist_prepend (binding_set_list, binding_set);
return binding_set;
}
/**
* gtk_binding_set_by_class: (skip)
* @object_class: a valid #GObject class
*
* This function returns the binding set named after the type name of
* the passed in class structure. New binding sets are created on
* demand by this function.
*
* Returns: (transfer none): the binding set corresponding to
* @object_class
*/
GtkBindingSet*
gtk_binding_set_by_class (gpointer object_class)
{
GObjectClass *class = object_class;
GtkBindingSet* binding_set;
g_return_val_if_fail (G_IS_OBJECT_CLASS (class), NULL);
if (!key_id_class_binding_set)
key_id_class_binding_set = g_quark_from_static_string (key_class_binding_set);
binding_set = g_dataset_id_get_data (class, key_id_class_binding_set);
if (binding_set)
return binding_set;
binding_set = gtk_binding_set_new (g_type_name (G_OBJECT_CLASS_TYPE (class)));
g_dataset_id_set_data (class, key_id_class_binding_set, binding_set);
return binding_set;
}
static GtkBindingSet*
gtk_binding_set_find_interned (const gchar *set_name)
{
GSList *slist;
for (slist = binding_set_list; slist; slist = slist->next)
{
GtkBindingSet *binding_set;
binding_set = slist->data;
if (binding_set->set_name == set_name)
return binding_set;
}
return NULL;
}
/**
* gtk_binding_set_find:
* @set_name: unique binding set name
*
* Find a binding set by its globally unique name.
*
* The @set_name can either be a name used for gtk_binding_set_new()
* or the type name of a class used in gtk_binding_set_by_class().
*
* Returns: (nullable) (transfer none): %NULL or the specified binding set
*/
GtkBindingSet*
gtk_binding_set_find (const gchar *set_name)
{
g_return_val_if_fail (set_name != NULL, NULL);
return gtk_binding_set_find_interned (g_intern_string (set_name));
}
/**
* gtk_binding_set_activate:
* @binding_set: a #GtkBindingSet set to activate
* @keyval: key value of the binding
* @modifiers: key modifier of the binding
* @object: object to activate when binding found
*
* Find a key binding matching @keyval and @modifiers within
* @binding_set and activate the binding on @object.
*
* Returns: %TRUE if a binding was found and activated
*/
gboolean
gtk_binding_set_activate (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers,
GObject *object)
{
GtkBindingEntry *entry;
g_return_val_if_fail (binding_set != NULL, FALSE);
g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
keyval = gdk_keyval_to_lower (keyval);
modifiers = modifiers & BINDING_MOD_MASK ();
entry = binding_ht_lookup_entry (binding_set, keyval, modifiers);
if (entry)
return gtk_binding_entry_activate (entry, object);
return FALSE;
}
static void
gtk_binding_entry_clear_internal (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers)
{
GtkBindingEntry *entry;
keyval = gdk_keyval_to_lower (keyval);
modifiers = modifiers & BINDING_MOD_MASK ();
entry = binding_ht_lookup_entry (binding_set, keyval, modifiers);
if (entry)
binding_entry_destroy (entry);
entry = binding_entry_new (binding_set, keyval, modifiers);
}
/**
* gtk_binding_entry_skip:
* @binding_set: a #GtkBindingSet to skip an entry of
* @keyval: key value of binding to skip
* @modifiers: key modifier of binding to skip
*
* Install a binding on @binding_set which causes key lookups
* to be aborted, to prevent bindings from lower priority sets
* to be activated.
*
* Since: 2.12
*/
void
gtk_binding_entry_skip (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers)
{
GtkBindingEntry *entry;
g_return_if_fail (binding_set != NULL);
keyval = gdk_keyval_to_lower (keyval);
modifiers = modifiers & BINDING_MOD_MASK ();
entry = binding_ht_lookup_entry (binding_set, keyval, modifiers);
if (entry)
binding_entry_destroy (entry);
entry = binding_entry_new (binding_set, keyval, modifiers);
entry->marks_unbound = TRUE;
}
/**
* gtk_binding_entry_remove:
* @binding_set: a #GtkBindingSet to remove an entry of
* @keyval: key value of binding to remove
* @modifiers: key modifier of binding to remove
*
* Remove a binding previously installed via
* gtk_binding_entry_add_signal() on @binding_set.
*/
void
gtk_binding_entry_remove (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers)
{
GtkBindingEntry *entry;
g_return_if_fail (binding_set != NULL);
keyval = gdk_keyval_to_lower (keyval);
modifiers = modifiers & BINDING_MOD_MASK ();
entry = binding_ht_lookup_entry (binding_set, keyval, modifiers);
if (entry)
binding_entry_destroy (entry);
}
/**
* gtk_binding_entry_add_signall:
* @binding_set: a #GtkBindingSet to add a signal to
* @keyval: key value
* @modifiers: key modifier
* @signal_name: signal name to be bound
* @binding_args: (transfer none) (element-type GtkBindingArg):
* list of #GtkBindingArg signal arguments
*
* Override or install a new key binding for @keyval with @modifiers on
* @binding_set.
*/
void
gtk_binding_entry_add_signall (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers,
const gchar *signal_name,
GSList *binding_args)
{
_gtk_binding_entry_add_signall (binding_set,
keyval, modifiers,
signal_name, binding_args);
}
void
_gtk_binding_entry_add_signall (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers,
const gchar *signal_name,
GSList *binding_args)
{
GtkBindingEntry *entry;
GtkBindingSignal *signal, **signal_p;
GSList *slist;
guint n = 0;
GtkBindingArg *arg;
g_return_if_fail (binding_set != NULL);
g_return_if_fail (signal_name != NULL);
keyval = gdk_keyval_to_lower (keyval);
modifiers = modifiers & BINDING_MOD_MASK ();
signal = binding_signal_new (signal_name, g_slist_length (binding_args));
arg = signal->args;
for (slist = binding_args; slist; slist = slist->next)
{
GtkBindingArg *tmp_arg;
tmp_arg = slist->data;
if (!tmp_arg)
{
g_warning ("gtk_binding_entry_add_signall(): arg[%u] is 'NULL'", n);
binding_signal_free (signal);
return;
}
switch (G_TYPE_FUNDAMENTAL (tmp_arg->arg_type))
{
case G_TYPE_LONG:
arg->arg_type = G_TYPE_LONG;
arg->d.long_data = tmp_arg->d.long_data;
break;
case G_TYPE_DOUBLE:
arg->arg_type = G_TYPE_DOUBLE;
arg->d.double_data = tmp_arg->d.double_data;
break;
case G_TYPE_STRING:
if (tmp_arg->arg_type != GTK_TYPE_IDENTIFIER)
arg->arg_type = G_TYPE_STRING;
else
arg->arg_type = GTK_TYPE_IDENTIFIER;
arg->d.string_data = g_strdup (tmp_arg->d.string_data);
if (!arg->d.string_data)
{
g_warning ("gtk_binding_entry_add_signall(): value of 'string' arg[%u] is 'NULL'", n);
binding_signal_free (signal);
return;
}
break;
default:
g_warning ("gtk_binding_entry_add_signall(): unsupported type '%s' for arg[%u]",
g_type_name (arg->arg_type), n);
binding_signal_free (signal);
return;
}
arg++;
n++;
}
entry = binding_ht_lookup_entry (binding_set, keyval, modifiers);
if (!entry)
{
gtk_binding_entry_clear_internal (binding_set, keyval, modifiers);
entry = binding_ht_lookup_entry (binding_set, keyval, modifiers);
}
signal_p = &entry->signals;
while (*signal_p)
signal_p = &(*signal_p)->next;
*signal_p = signal;
}
/**
* gtk_binding_entry_add_signal:
* @binding_set: a #GtkBindingSet to install an entry for
* @keyval: key value of binding to install
* @modifiers: key modifier of binding to install
* @signal_name: signal to execute upon activation
* @n_args: number of arguments to @signal_name
* @...: arguments to @signal_name
*
* Override or install a new key binding for @keyval with @modifiers on
* @binding_set. When the binding is activated, @signal_name will be
* emitted on the target widget, with @n_args @Varargs used as
* arguments.
*
* Each argument to the signal must be passed as a pair of varargs: the
* #GType of the argument, followed by the argument value (which must
* be of the given type). There must be @n_args pairs in total.
*
* ## Adding a Key Binding
*
* |[<!-- language="C" -->
* gtk_binding_entry_add_signal (binding_set, keyval, modmask,
* "move-cursor", 3,
* G_TYPE_ENUM, step,
* G_TYPE_INT, count,
* G_TYPE_BOOLEAN, FALSE);
* ]|
*/
void
gtk_binding_entry_add_signal (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers,
const gchar *signal_name,
guint n_args,
...)
{
GSList *slist, *free_slist;
va_list args;
guint i;
g_return_if_fail (binding_set != NULL);
g_return_if_fail (signal_name != NULL);
va_start (args, n_args);
slist = NULL;
for (i = 0; i < n_args; i++)
{
GtkBindingArg *arg;
arg = g_slice_new0 (GtkBindingArg);
slist = g_slist_prepend (slist, arg);
arg->arg_type = va_arg (args, GType);
switch (G_TYPE_FUNDAMENTAL (arg->arg_type))
{
case G_TYPE_CHAR:
case G_TYPE_UCHAR:
case G_TYPE_INT:
case G_TYPE_UINT:
case G_TYPE_BOOLEAN:
case G_TYPE_ENUM:
case G_TYPE_FLAGS:
arg->arg_type = G_TYPE_LONG;
arg->d.long_data = va_arg (args, gint);
break;
case G_TYPE_LONG:
case G_TYPE_ULONG:
arg->arg_type = G_TYPE_LONG;
arg->d.long_data = va_arg (args, glong);
break;
case G_TYPE_FLOAT:
case G_TYPE_DOUBLE:
arg->arg_type = G_TYPE_DOUBLE;
arg->d.double_data = va_arg (args, gdouble);
break;
case G_TYPE_STRING:
if (arg->arg_type != GTK_TYPE_IDENTIFIER)
arg->arg_type = G_TYPE_STRING;
arg->d.string_data = va_arg (args, gchar*);
if (!arg->d.string_data)
{
g_warning ("gtk_binding_entry_add_signal(): type '%s' arg[%u] is 'NULL'",
g_type_name (arg->arg_type),
i);
i += n_args + 1;
}
break;
default:
g_warning ("gtk_binding_entry_add_signal(): unsupported type '%s' for arg[%u]",
g_type_name (arg->arg_type), i);
i += n_args + 1;
break;
}
}
va_end (args);
if (i == n_args || i == 0)
{
slist = g_slist_reverse (slist);
_gtk_binding_entry_add_signall (binding_set, keyval, modifiers, signal_name, slist);
}
free_slist = slist;
while (slist)
{
g_slice_free (GtkBindingArg, slist->data);
slist = slist->next;
}
g_slist_free (free_slist);
}
static guint
gtk_binding_parse_signal (GScanner *scanner,
GtkBindingSet *binding_set,
guint keyval,
GdkModifierType modifiers)
{
gchar *signal;
guint expected_token = 0;
GSList *args;
GSList *slist;
gboolean done;
gboolean negate;
gboolean need_arg;
gboolean seen_comma;
g_return_val_if_fail (scanner != NULL, G_TOKEN_ERROR);
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_STRING)
return G_TOKEN_STRING;
g_scanner_peek_next_token (scanner);
if (scanner->next_token != '(')
{
g_scanner_get_next_token (scanner);
return '(';
}
signal = g_strdup (scanner->value.v_string);
g_scanner_get_next_token (scanner);
negate = FALSE;
args = NULL;
done = FALSE;
need_arg = TRUE;
seen_comma = FALSE;
scanner->config->scan_symbols = FALSE;
do
{
GtkBindingArg *arg;
if (need_arg)
expected_token = G_TOKEN_INT;
else
expected_token = ')';
g_scanner_get_next_token (scanner);
switch ((guint) scanner->token)
{
case G_TOKEN_FLOAT:
if (need_arg)
{
need_arg = FALSE;
arg = g_new (GtkBindingArg, 1);
arg->arg_type = G_TYPE_DOUBLE;
arg->d.double_data = scanner->value.v_float;
if (negate)
{
arg->d.double_data = - arg->d.double_data;
negate = FALSE;
}
args = g_slist_prepend (args, arg);
}
else
done = TRUE;
break;
case G_TOKEN_INT:
if (need_arg)
{
need_arg = FALSE;
arg = g_new (GtkBindingArg, 1);
arg->arg_type = G_TYPE_LONG;
arg->d.long_data = scanner->value.v_int;
if (negate)
{
arg->d.long_data = - arg->d.long_data;
negate = FALSE;
}
args = g_slist_prepend (args, arg);
}
else
done = TRUE;
break;
case G_TOKEN_STRING:
if (need_arg && !negate)
{
need_arg = FALSE;
arg = g_new (GtkBindingArg, 1);
arg->arg_type = G_TYPE_STRING;
arg->d.string_data = g_strdup (scanner->value.v_string);
args = g_slist_prepend (args, arg);
}
else
done = TRUE;
break;
case G_TOKEN_IDENTIFIER:
if (need_arg && !negate)
{
need_arg = FALSE;
arg = g_new (GtkBindingArg, 1);
arg->arg_type = GTK_TYPE_IDENTIFIER;
arg->d.string_data = g_strdup (scanner->value.v_identifier);
args = g_slist_prepend (args, arg);
}
else
done = TRUE;
break;
case '-':
if (!need_arg)
done = TRUE;
else if (negate)
{
expected_token = G_TOKEN_INT;
done = TRUE;
}
else
negate = TRUE;
break;
case ',':
seen_comma = TRUE;
if (need_arg)
done = TRUE;
else
need_arg = TRUE;
break;
case ')':
if (!(need_arg && seen_comma) && !negate)
{
args = g_slist_reverse (args);
_gtk_binding_entry_add_signall (binding_set,
keyval,
modifiers,
signal,
args);
expected_token = G_TOKEN_NONE;
}
done = TRUE;
break;
default:
done = TRUE;
break;
}
}
while (!done);
scanner->config->scan_symbols = TRUE;
for (slist = args; slist; slist = slist->next)
{
GtkBindingArg *arg;
arg = slist->data;
if (G_TYPE_FUNDAMENTAL (arg->arg_type) == G_TYPE_STRING)
g_free (arg->d.string_data);
g_free (arg);
}
g_slist_free (args);
g_free (signal);
return expected_token;
}
static inline guint
gtk_binding_parse_bind (GScanner *scanner,
GtkBindingSet *binding_set)
{
guint keyval = 0;
GdkModifierType modifiers = 0;
gboolean unbind = FALSE;
g_return_val_if_fail (scanner != NULL, G_TOKEN_ERROR);
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_SYMBOL)
return G_TOKEN_SYMBOL;
if (scanner->value.v_symbol != GUINT_TO_POINTER (GTK_BINDING_TOKEN_BIND) &&
scanner->value.v_symbol != GUINT_TO_POINTER (GTK_BINDING_TOKEN_UNBIND))
return G_TOKEN_SYMBOL;
unbind = (scanner->value.v_symbol == GUINT_TO_POINTER (GTK_BINDING_TOKEN_UNBIND));
g_scanner_get_next_token (scanner);
if (scanner->token != (guint) G_TOKEN_STRING)
return G_TOKEN_STRING;
gtk_accelerator_parse (scanner->value.v_string, &keyval, &modifiers);
modifiers &= BINDING_MOD_MASK ();
if (keyval == 0)
return G_TOKEN_STRING;
if (unbind)
{
gtk_binding_entry_skip (binding_set, keyval, modifiers);
return G_TOKEN_NONE;
}
g_scanner_get_next_token (scanner);
if (scanner->token != '{')
return '{';
gtk_binding_entry_clear_internal (binding_set, keyval, modifiers);
g_scanner_peek_next_token (scanner);
while (scanner->next_token != '}')
{
guint expected_token;
switch (scanner->next_token)
{
case G_TOKEN_STRING:
expected_token = gtk_binding_parse_signal (scanner,
binding_set,
keyval,
modifiers);
if (expected_token != G_TOKEN_NONE)
return expected_token;
break;
default:
g_scanner_get_next_token (scanner);
return '}';
}
g_scanner_peek_next_token (scanner);
}
g_scanner_get_next_token (scanner);
return G_TOKEN_NONE;
}
static GScanner *
create_signal_scanner (void)
{
GScanner *scanner;
scanner = g_scanner_new (NULL);
scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_";
g_scanner_scope_add_symbol (scanner, 0, "bind", GUINT_TO_POINTER (GTK_BINDING_TOKEN_BIND));
g_scanner_scope_add_symbol (scanner, 0, "unbind", GUINT_TO_POINTER (GTK_BINDING_TOKEN_UNBIND));
g_scanner_set_scope (scanner, 0);
return scanner;
}
/**
* gtk_binding_entry_add_signal_from_string:
* @binding_set: a #GtkBindingSet
* @signal_desc: a signal description
*
* Parses a signal description from @signal_desc and incorporates
* it into @binding_set.
*
* Signal descriptions may either bind a key combination to
* one or more signals:
* |[
* bind "key" {
* "signalname" (param, ...)
* ...
* }
* ]|
*
* Or they may also unbind a key combination:
* |[
* unbind "key"
* ]|
*
* Key combinations must be in a format that can be parsed by
* gtk_accelerator_parse().
*
* Returns: %G_TOKEN_NONE if the signal was successfully parsed and added,
* the expected token otherwise
*
* Since: 3.0
*/
GTokenType
gtk_binding_entry_add_signal_from_string (GtkBindingSet *binding_set,
const gchar *signal_desc)
{
static GScanner *scanner = NULL;
GTokenType ret;
g_return_val_if_fail (binding_set != NULL, G_TOKEN_NONE);
g_return_val_if_fail (signal_desc != NULL, G_TOKEN_NONE);
if (G_UNLIKELY (!scanner))
scanner = create_signal_scanner ();
g_scanner_input_text (scanner, signal_desc,
(guint) strlen (signal_desc));
ret = gtk_binding_parse_bind (scanner, binding_set);
/* Reset for next use */
g_scanner_set_scope (scanner, 0);
return ret;
}
static gint
find_entry_with_binding (GtkBindingEntry *entry,
GtkBindingSet *binding_set)
{
return (entry->binding_set == binding_set) ? 0 : 1;
}
static gboolean
binding_activate (GtkBindingSet *binding_set,
GSList *entries,
GObject *object,
gboolean is_release,
gboolean *unbound)
{
GtkBindingEntry *entry;
GSList *elem;
elem = g_slist_find_custom (entries, binding_set,
(GCompareFunc) find_entry_with_binding);
if (!elem)
return FALSE;
entry = elem->data;
if (is_release != ((entry->modifiers & GDK_RELEASE_MASK) != 0))
return FALSE;
if (entry->marks_unbound)
{
*unbound = TRUE;
return FALSE;
}
if (gtk_binding_entry_activate (entry, object))
return TRUE;
return FALSE;
}
static gboolean
gtk_bindings_activate_list (GObject *object,
GSList *entries,
gboolean is_release)
{
GtkStyleContext *context;
GtkBindingSet *binding_set;
gboolean handled = FALSE;
gboolean unbound = FALSE;
GPtrArray *array;
if (!entries)
return FALSE;
context = gtk_widget_get_style_context (GTK_WIDGET (object));
gtk_style_context_get (context, gtk_style_context_get_state (context),
"-gtk-key-bindings", &array,
NULL);
if (array)
{
gint i;
for (i = 0; i < array->len; i++)
{
binding_set = g_ptr_array_index (array, i);
handled = binding_activate (binding_set, entries,
object, is_release,
&unbound);
if (handled || unbound)
break;
}
g_ptr_array_unref (array);
if (unbound)
return FALSE;
}
if (!handled)
{
GType class_type;
class_type = G_TYPE_FROM_INSTANCE (object);
while (class_type && !handled)
{
binding_set = gtk_binding_set_find_interned (g_type_name (class_type));
class_type = g_type_parent (class_type);
if (!binding_set)
continue;
handled = binding_activate (binding_set, entries,
object, is_release,
&unbound);
if (unbound)
break;
}
if (unbound)
return FALSE;
}
return handled;
}
/**
* gtk_bindings_activate:
* @object: object to activate when binding found
* @keyval: key value of the binding
* @modifiers: key modifier of the binding
*
* Find a key binding matching @keyval and @modifiers and activate the
* binding on @object.
*
* Returns: %TRUE if a binding was found and activated
*/
gboolean
gtk_bindings_activate (GObject *object,
guint keyval,
GdkModifierType modifiers)
{
GSList *entries = NULL;
GdkDisplay *display;
GtkKeyHash *key_hash;
gboolean handled = FALSE;
gboolean is_release;
if (!GTK_IS_WIDGET (object))
return FALSE;
is_release = (modifiers & GDK_RELEASE_MASK) != 0;
modifiers = modifiers & BINDING_MOD_MASK () & ~GDK_RELEASE_MASK;
display = gtk_widget_get_display (GTK_WIDGET (object));
key_hash = binding_key_hash_for_keymap (gdk_keymap_get_for_display (display));
entries = _gtk_key_hash_lookup_keyval (key_hash, keyval, modifiers);
handled = gtk_bindings_activate_list (object, entries, is_release);
g_slist_free (entries);
return handled;
}
/**
* gtk_bindings_activate_event:
* @object: a #GObject (generally must be a widget)
* @event: a #GdkEventKey
*
* Looks up key bindings for @object to find one matching
* @event, and if one was found, activate it.
*
* Returns: %TRUE if a matching key binding was found
*
* Since: 2.4
*/
gboolean
gtk_bindings_activate_event (GObject *object,
GdkEventKey *event)
{
GSList *entries = NULL;
GdkDisplay *display;
GtkKeyHash *key_hash;
gboolean handled = FALSE;
if (!GTK_IS_WIDGET (object))
return FALSE;
display = gtk_widget_get_display (GTK_WIDGET (object));
key_hash = binding_key_hash_for_keymap (gdk_keymap_get_for_display (display));
entries = _gtk_key_hash_lookup (key_hash,
event->hardware_keycode,
event->state,
BINDING_MOD_MASK () & ~GDK_RELEASE_MASK,
event->group);
handled = gtk_bindings_activate_list (object, entries,
event->type == GDK_KEY_RELEASE);
g_slist_free (entries);
return handled;
}
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