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gtk/gdk/gdkkeys.c
Matthias Clasen f771046a00 gdk: Add some more docs 
Add another reference to the docs.
2018-02-11 00:41:31 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 2000 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, 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 "gdkkeysyms.h"
#include "gdkkeysprivate.h"
#include "gdkdisplay.h"
#include "gdkdisplaymanagerprivate.h"
/**
* SECTION:keys
* @Short_description: Functions for manipulating keyboard codes
* @Title: Key Values
*
* Key values are the codes which are sent whenever a key is pressed or released.
* They appear in the #GdkEventKey.keyval field of the #GdkEventKey structure.
* The complete list of key values can be found in the `gdk/gdkkeysyms.h` header file.
*
* Key values are regularly updated from the upstream X.org X11 implementation,
* so new values are added regularly. They will be prefixed with GDK_KEY_ rather
* than XF86XK_ or XK_ (for older symbols).
*
* Key values can be converted into a string representation using
* gdk_keyval_name(). The reverse function, converting a string to a key value,
* is provided by gdk_keyval_from_name().
*
* The case of key values can be determined using gdk_keyval_is_upper() and
* gdk_keyval_is_lower(). Key values can be converted to upper or lower case
* using gdk_keyval_to_upper() and gdk_keyval_to_lower().
*
* When it makes sense, key values can be converted to and from
* Unicode characters with gdk_keyval_to_unicode() and gdk_unicode_to_keyval().
*
* # Groups # {#key-group-explanation}
*
* One #GdkKeymap object exists for each user display. To obtain keymaps for
* a display, use gdk_display_get_keymap(). A keymap is a mapping from
* #GdkKeymapKey to key values. You can think of a #GdkKeymapKey as a
* representation of a symbol printed on a physical keyboard key. That is, it
* contains three pieces of information. First, it contains the hardware keycode;
* this is an identifying number for a physical key. Second, it contains the
* “level” of the key. The level indicates which symbol on the
* key will be used, in a vertical direction. So on a standard US keyboard, the key
* with the number “1“ on it also has the exclamation point (”!”) character on
* it. The level indicates whether to use the “1” or the “!” symbol. The letter
* keys are considered to have a lowercase letter at level 0, and an uppercase
* letter at level 1, though only the uppercase letter is printed. Third, the
* #GdkKeymapKey contains a group; groups are not used on standard US keyboards,
* but are used in many other countries. On a keyboard with groups, there can be 3
* or 4 symbols printed on a single key. The group indicates movement in a
* horizontal direction. Usually groups are used for two different languages. In
* group 0, a key might have two English characters, and in group 1 it might have
* two Hebrew characters. The Hebrew characters will be printed on the key next to
* the English characters.
*
* In order to use a keymap to interpret a key event, it’s necessary to first
* convert the keyboard state into an effective group and level. This is done via a
* set of rules that varies widely according to type of keyboard and user
* configuration. The function gdk_keymap_translate_keyboard_state() accepts a
* keyboard state -- consisting of hardware keycode pressed, active modifiers, and
* active group -- applies the appropriate rules, and returns the group/level to be
* used to index the keymap, along with the modifiers which did not affect the
* group and level. i.e. it returns “unconsumed modifiers.” The keyboard group may
* differ from the effective group used for keymap lookups because some keys don't
* have multiple groups - e.g. the Enter key is always in group 0 regardless of
* keyboard state.
*
* Note that gdk_keymap_translate_keyboard_state() also returns the keyval, i.e. it
* goes ahead and performs the keymap lookup in addition to telling you which
* effective group/level values were used for the lookup. #GdkEventKey already
* contains this keyval, however, so you don’t normally need to call
* gdk_keymap_translate_keyboard_state() just to get the keyval.
*/
enum {
PROP_0,
PROP_DISPLAY,
LAST_PROP
};
enum {
DIRECTION_CHANGED,
KEYS_CHANGED,
STATE_CHANGED,
LAST_SIGNAL
};
static GParamSpec *props[LAST_PROP] = { NULL, };
static guint signals[LAST_SIGNAL] = { 0 };
static GdkModifierType gdk_keymap_real_get_modifier_mask (GdkKeymap *keymap,
GdkModifierIntent intent);
G_DEFINE_TYPE (GdkKeymap, gdk_keymap, G_TYPE_OBJECT)
static void
gdk_keymap_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkKeymap *keymap = GDK_KEYMAP (object);
switch (prop_id)
{
case PROP_DISPLAY:
g_value_set_object (value, keymap->display);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gdk_keymap_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkKeymap *keymap = GDK_KEYMAP (object);
switch (prop_id)
{
case PROP_DISPLAY:
keymap->display = g_value_get_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gdk_keymap_class_init (GdkKeymapClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->get_property = gdk_keymap_get_property;
object_class->set_property = gdk_keymap_set_property;
klass->get_modifier_mask = gdk_keymap_real_get_modifier_mask;
props[PROP_DISPLAY] =
g_param_spec_object ("display",
"Display",
"The display of the keymap",
GDK_TYPE_DISPLAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, LAST_PROP, props);
/**
* GdkKeymap::direction-changed:
* @keymap: the object on which the signal is emitted
*
* The ::direction-changed signal gets emitted when the direction
* of the keymap changes. See gdk_keymap_get_direction().
*/
signals[DIRECTION_CHANGED] =
g_signal_new (g_intern_static_string ("direction-changed"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkKeymapClass, direction_changed),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE,
0);
/**
* GdkKeymap::keys-changed:
* @keymap: the object on which the signal is emitted
*
* The ::keys-changed signal is emitted when the mapping represented by
* @keymap changes.
*/
signals[KEYS_CHANGED] =
g_signal_new (g_intern_static_string ("keys-changed"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkKeymapClass, keys_changed),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE,
0);
/**
* GdkKeymap::state-changed:
* @keymap: the object on which the signal is emitted
*
* The ::state-changed signal is emitted when the state of the
* keyboard changes, e.g when Caps Lock is turned on or off.
* See gdk_keymap_get_caps_lock_state().
*/
signals[STATE_CHANGED] =
g_signal_new (g_intern_static_string ("state-changed"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkKeymapClass, state_changed),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE,
0);
}
static void
gdk_keymap_init (GdkKeymap *keymap)
{
}
/**
* gdk_keymap_get_display:
* @keymap: a #GdkKeymap
*
* Retrieves the #GdkDisplay associated to the @keymap.
*
* Returns: (transfer none): a #GdkDisplay
*/
GdkDisplay *
gdk_keymap_get_display (GdkKeymap *keymap)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), NULL);
return keymap->display;
}
/* Other key-handling stuff
*/
/**
* gdk_keyval_to_upper:
* @keyval: a key value.
*
* Converts a key value to upper case, if applicable.
*
* Returns: the upper case form of @keyval, or @keyval itself if it is already
* in upper case or it is not subject to case conversion.
*/
guint
gdk_keyval_to_upper (guint keyval)
{
guint result;
gdk_keyval_convert_case (keyval, NULL, &result);
return result;
}
/**
* gdk_keyval_to_lower:
* @keyval: a key value.
*
* Converts a key value to lower case, if applicable.
*
* Returns: the lower case form of @keyval, or @keyval itself if it is already
* in lower case or it is not subject to case conversion.
*/
guint
gdk_keyval_to_lower (guint keyval)
{
guint result;
gdk_keyval_convert_case (keyval, &result, NULL);
return result;
}
/**
* gdk_keyval_is_upper:
* @keyval: a key value.
*
* Returns %TRUE if the given key value is in upper case.
*
* Returns: %TRUE if @keyval is in upper case, or if @keyval is not subject to
* case conversion.
*/
gboolean
gdk_keyval_is_upper (guint keyval)
{
if (keyval)
{
guint upper_val = 0;
gdk_keyval_convert_case (keyval, NULL, &upper_val);
return upper_val == keyval;
}
return FALSE;
}
/**
* gdk_keyval_is_lower:
* @keyval: a key value.
*
* Returns %TRUE if the given key value is in lower case.
*
* Returns: %TRUE if @keyval is in lower case, or if @keyval is not
* subject to case conversion.
*/
gboolean
gdk_keyval_is_lower (guint keyval)
{
if (keyval)
{
guint lower_val = 0;
gdk_keyval_convert_case (keyval, &lower_val, NULL);
return lower_val == keyval;
}
return FALSE;
}
/**
* gdk_keymap_get_direction:
* @keymap: a #GdkKeymap
*
* Returns the direction of effective layout of the keymap.
* The direction of a layout is the direction of the majority of its
* symbols. See pango_unichar_direction().
*
* Returns: %PANGO_DIRECTION_LTR or %PANGO_DIRECTION_RTL
* if it can determine the direction. %PANGO_DIRECTION_NEUTRAL
* otherwise.
**/
PangoDirection
gdk_keymap_get_direction (GdkKeymap *keymap)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), PANGO_DIRECTION_LTR);
return GDK_KEYMAP_GET_CLASS (keymap)->get_direction (keymap);
}
/**
* gdk_keymap_have_bidi_layouts:
* @keymap: a #GdkKeymap
*
* Determines if keyboard layouts for both right-to-left and left-to-right
* languages are in use.
*
* Returns: %TRUE if there are layouts in both directions, %FALSE otherwise
**/
gboolean
gdk_keymap_have_bidi_layouts (GdkKeymap *keymap)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
return GDK_KEYMAP_GET_CLASS (keymap)->have_bidi_layouts (keymap);
}
/**
* gdk_keymap_get_caps_lock_state:
* @keymap: a #GdkKeymap
*
* Returns whether the Caps Lock modifer is locked.
*
* Returns: %TRUE if Caps Lock is on
*/
gboolean
gdk_keymap_get_caps_lock_state (GdkKeymap *keymap)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
return GDK_KEYMAP_GET_CLASS (keymap)->get_caps_lock_state (keymap);
}
/**
* gdk_keymap_get_num_lock_state:
* @keymap: a #GdkKeymap
*
* Returns whether the Num Lock modifer is locked.
*
* Returns: %TRUE if Num Lock is on
*/
gboolean
gdk_keymap_get_num_lock_state (GdkKeymap *keymap)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
return GDK_KEYMAP_GET_CLASS (keymap)->get_num_lock_state (keymap);
}
/**
* gdk_keymap_get_scroll_lock_state:
* @keymap: a #GdkKeymap
*
* Returns whether the Scroll Lock modifer is locked.
*
* Returns: %TRUE if Scroll Lock is on
*/
gboolean
gdk_keymap_get_scroll_lock_state (GdkKeymap *keymap)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
return GDK_KEYMAP_GET_CLASS (keymap)->get_scroll_lock_state (keymap);
}
/**
* gdk_keymap_get_modifier_state:
* @keymap: a #GdkKeymap
*
* Returns the current modifier state.
*
* Returns: the current modifier state.
*/
guint
gdk_keymap_get_modifier_state (GdkKeymap *keymap)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
if (GDK_KEYMAP_GET_CLASS (keymap)->get_modifier_state)
return GDK_KEYMAP_GET_CLASS (keymap)->get_modifier_state (keymap);
return 0;
}
/**
* gdk_keymap_get_entries_for_keyval:
* @keymap: a #GdkKeymap
* @keyval: a keyval, such as %GDK_KEY_a, %GDK_KEY_Up, %GDK_KEY_Return, etc.
* @keys: (out) (array length=n_keys) (transfer full): return location
* for an array of #GdkKeymapKey
* @n_keys: return location for number of elements in returned array
*
* Obtains a list of keycode/group/level combinations that will
* generate @keyval. Groups and levels are two kinds of keyboard mode;
* in general, the level determines whether the top or bottom symbol
* on a key is used, and the group determines whether the left or
* right symbol is used. On US keyboards, the shift key changes the
* keyboard level, and there are no groups. A group switch key might
* convert a keyboard between Hebrew to English modes, for example.
* #GdkEventKey contains a %group field that indicates the active
* keyboard group. The level is computed from the modifier mask.
* The returned array should be freed
* with g_free().
*
* Returns: %TRUE if keys were found and returned
**/
gboolean
gdk_keymap_get_entries_for_keyval (GdkKeymap *keymap,
guint keyval,
GdkKeymapKey **keys,
gint *n_keys)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
g_return_val_if_fail (keys != NULL, FALSE);
g_return_val_if_fail (n_keys != NULL, FALSE);
g_return_val_if_fail (keyval != 0, FALSE);
return GDK_KEYMAP_GET_CLASS (keymap)->get_entries_for_keyval (keymap, keyval,
keys, n_keys);
}
/**
* gdk_keymap_get_entries_for_keycode:
* @keymap: a #GdkKeymap
* @hardware_keycode: a keycode
* @keys: (out) (array length=n_entries) (transfer full) (optional): return
* location for array of #GdkKeymapKey, or %NULL
* @keyvals: (out) (array length=n_entries) (transfer full) (optional): return
* location for array of keyvals, or %NULL
* @n_entries: length of @keys and @keyvals
*
* Returns the keyvals bound to @hardware_keycode.
* The Nth #GdkKeymapKey in @keys is bound to the Nth
* keyval in @keyvals. Free the returned arrays with g_free().
* When a keycode is pressed by the user, the keyval from
* this list of entries is selected by considering the effective
* keyboard group and level. See gdk_keymap_translate_keyboard_state().
*
* Returns: %TRUE if there were any entries
**/
gboolean
gdk_keymap_get_entries_for_keycode (GdkKeymap *keymap,
guint hardware_keycode,
GdkKeymapKey **keys,
guint **keyvals,
gint *n_entries)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
g_return_val_if_fail (n_entries != NULL, FALSE);
return GDK_KEYMAP_GET_CLASS (keymap)->get_entries_for_keycode (keymap, hardware_keycode,
keys, keyvals, n_entries);
}
/**
* gdk_keymap_lookup_key:
* @keymap: a #GdkKeymap
* @key: a #GdkKeymapKey with keycode, group, and level initialized
*
* Looks up the keyval mapped to a keycode/group/level triplet.
* If no keyval is bound to @key, returns 0. For normal user input,
* you want to use gdk_keymap_translate_keyboard_state() instead of
* this function, since the effective group/level may not be
* the same as the current keyboard state.
*
* Returns: a keyval, or 0 if none was mapped to the given @key
**/
guint
gdk_keymap_lookup_key (GdkKeymap *keymap,
const GdkKeymapKey *key)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), 0);
g_return_val_if_fail (key != NULL, 0);
return GDK_KEYMAP_GET_CLASS (keymap)->lookup_key (keymap, key);
}
/**
* gdk_keymap_translate_keyboard_state:
* @keymap: a #GdkKeymap
* @hardware_keycode: a keycode
* @state: a modifier state
* @group: active keyboard group
* @keyval: (out) (allow-none): return location for keyval, or %NULL
* @effective_group: (out) (allow-none): return location for effective
* group, or %NULL
* @level: (out) (allow-none): return location for level, or %NULL
* @consumed_modifiers: (out) (allow-none): return location for modifiers
* that were used to determine the group or level, or %NULL
*
* Translates the contents of a #GdkEventKey into a keyval, effective
* group, and level. Modifiers that affected the translation and
* are thus unavailable for application use are returned in
* @consumed_modifiers.
* See [Groups][key-group-explanation] for an explanation of
* groups and levels. The @effective_group is the group that was
* actually used for the translation; some keys such as Enter are not
* affected by the active keyboard group. The @level is derived from
* @state. For convenience, #GdkEventKey already contains the translated
* keyval, so this function isn’t as useful as you might think.
*
* @consumed_modifiers gives modifiers that should be masked outfrom @state
* when comparing this key press to a hot key. For instance, on a US keyboard,
* the `plus` symbol is shifted, so when comparing a key press to a
* `<Control>plus` accelerator `<Shift>` should be masked out.
*
* |[<!-- language="C" -->
* // We want to ignore irrelevant modifiers like ScrollLock
* #define ALL_ACCELS_MASK (GDK_CONTROL_MASK | GDK_SHIFT_MASK | GDK_MOD1_MASK)
* gdk_keymap_translate_keyboard_state (keymap, event->hardware_keycode,
* event->state, event->group,
* &keyval, NULL, NULL, &consumed);
* if (keyval == GDK_PLUS &&
* (event->state & ~consumed & ALL_ACCELS_MASK) == GDK_CONTROL_MASK)
* // Control was pressed
* ]|
*
* An older interpretation @consumed_modifiers was that it contained
* all modifiers that might affect the translation of the key;
* this allowed accelerators to be stored with irrelevant consumed
* modifiers, by doing:
* |[<!-- language="C" -->
* // XXX Don’t do this XXX
* if (keyval == accel_keyval &&
* (event->state & ~consumed & ALL_ACCELS_MASK) == (accel_mods & ~consumed))
* // Accelerator was pressed
* ]|
*
* However, this did not work if multi-modifier combinations were
* used in the keymap, since, for instance, `<Control>` would be
* masked out even if only `<Control><Alt>` was used in the keymap.
* To support this usage as well as well as possible, all single
* modifier combinations that could affect the key for any combination
* of modifiers will be returned in @consumed_modifiers; multi-modifier
* combinations are returned only when actually found in @state. When
* you store accelerators, you should always store them with consumed
* modifiers removed. Store `<Control>plus`, not `<Control><Shift>plus`,
*
* Returns: %TRUE if there was a keyval bound to the keycode/state/group
**/
gboolean
gdk_keymap_translate_keyboard_state (GdkKeymap *keymap,
guint hardware_keycode,
GdkModifierType state,
gint group,
guint *keyval,
gint *effective_group,
gint *level,
GdkModifierType *consumed_modifiers)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
return GDK_KEYMAP_GET_CLASS (keymap)->translate_keyboard_state (keymap,
hardware_keycode,
state,
group,
keyval,
effective_group,
level,
consumed_modifiers);
}
/**
* gdk_keymap_add_virtual_modifiers:
* @keymap: a #GdkKeymap
* @state: (inout): pointer to the modifier mask to change
*
* Maps the non-virtual modifiers (i.e Mod2, Mod3, ...) which are set
* in @state to the virtual modifiers (i.e. Super, Hyper and Meta) and
* set the corresponding bits in @state.
*
* GDK already does this before delivering key events, but for
* compatibility reasons, it only sets the first virtual modifier
* it finds, whereas this function sets all matching virtual modifiers.
*
* This function is useful when matching key events against
* accelerators.
*/
void
gdk_keymap_add_virtual_modifiers (GdkKeymap *keymap,
GdkModifierType *state)
{
g_return_if_fail (GDK_IS_KEYMAP (keymap));
GDK_KEYMAP_GET_CLASS (keymap)->add_virtual_modifiers (keymap, state);
}
/**
* gdk_keymap_map_virtual_modifiers:
* @keymap: a #GdkKeymap
* @state: (inout): pointer to the modifier state to map
*
* Maps the virtual modifiers (i.e. Super, Hyper and Meta) which
* are set in @state to their non-virtual counterparts (i.e. Mod2,
* Mod3,...) and set the corresponding bits in @state.
*
* This function is useful when matching key events against
* accelerators.
*
* Returns: %FALSE if two virtual modifiers were mapped to the
* same non-virtual modifier. Note that %FALSE is also returned
* if a virtual modifier is mapped to a non-virtual modifier that
* was already set in @state.
*/
gboolean
gdk_keymap_map_virtual_modifiers (GdkKeymap *keymap,
GdkModifierType *state)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), FALSE);
return GDK_KEYMAP_GET_CLASS(keymap)->map_virtual_modifiers (keymap, state);
}
static GdkModifierType
gdk_keymap_real_get_modifier_mask (GdkKeymap *keymap,
GdkModifierIntent intent)
{
switch (intent)
{
case GDK_MODIFIER_INTENT_PRIMARY_ACCELERATOR:
return GDK_CONTROL_MASK;
case GDK_MODIFIER_INTENT_CONTEXT_MENU:
return 0;
case GDK_MODIFIER_INTENT_EXTEND_SELECTION:
return GDK_SHIFT_MASK;
case GDK_MODIFIER_INTENT_MODIFY_SELECTION:
return GDK_CONTROL_MASK;
case GDK_MODIFIER_INTENT_NO_TEXT_INPUT:
return GDK_MOD1_MASK | GDK_CONTROL_MASK;
case GDK_MODIFIER_INTENT_SHIFT_GROUP:
return 0;
case GDK_MODIFIER_INTENT_DEFAULT_MOD_MASK:
return (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK |
GDK_SUPER_MASK | GDK_HYPER_MASK | GDK_META_MASK);
default:
g_return_val_if_reached (0);
}
}
/**
* gdk_keymap_get_modifier_mask:
* @keymap: a #GdkKeymap
* @intent: the use case for the modifier mask
*
* Returns the modifier mask the @keymap’s windowing system backend
* uses for a particular purpose.
*
* Note that this function always returns real hardware modifiers, not
* virtual ones (e.g. it will return #GDK_MOD1_MASK rather than
* #GDK_META_MASK if the backend maps MOD1 to META), so there are use
* cases where the return value of this function has to be transformed
* by gdk_keymap_add_virtual_modifiers() in order to contain the
* expected result.
*
* Returns: the modifier mask used for @intent.
**/
GdkModifierType
gdk_keymap_get_modifier_mask (GdkKeymap *keymap,
GdkModifierIntent intent)
{
g_return_val_if_fail (GDK_IS_KEYMAP (keymap), 0);
return GDK_KEYMAP_GET_CLASS (keymap)->get_modifier_mask (keymap, intent);
}
#include "gdkkeynames.c"
/**
* gdk_keyval_name:
* @keyval: a key value
*
* Converts a key value into a symbolic name.
*
* The names are the same as those in the
* `gdk/gdkkeysyms.h` header file
* but without the leading “GDK_KEY_”.
*
* Returns: (nullable) (transfer none): a string containing the name
* of the key, or %NULL if @keyval is not a valid key. The string
* should not be modified.
*/
gchar *
gdk_keyval_name (guint keyval)
{
return _gdk_keyval_name (keyval);
}
/**
* gdk_keyval_from_name:
* @keyval_name: a key name
*
* Converts a key name to a key value.
*
* The names are the same as those in the
* `gdk/gdkkeysyms.h` header file
* but without the leading “GDK_KEY_”.
*
* Returns: the corresponding key value, or %GDK_KEY_VoidSymbol
* if the key name is not a valid key
*/
guint
gdk_keyval_from_name (const gchar *keyval_name)
{
return _gdk_keyval_from_name (keyval_name);
}
/**
* gdk_keyval_convert_case:
* @symbol: a keyval
* @lower: (out): return location for lowercase version of @symbol
* @upper: (out): return location for uppercase version of @symbol
*
* Obtains the upper- and lower-case versions of the keyval @symbol.
* Examples of keyvals are #GDK_KEY_a, #GDK_KEY_Enter, #GDK_KEY_F1, etc.
*/
void
gdk_keyval_convert_case (guint symbol,
guint *lower,
guint *upper)
{
guint xlower, xupper;
xlower = symbol;
xupper = symbol;
/* Check for directly encoded 24-bit UCS characters: */
if ((symbol & 0xff000000) == 0x01000000)
{
if (lower)
*lower = gdk_unicode_to_keyval (g_unichar_tolower (symbol & 0x00ffffff));
if (upper)
*upper = gdk_unicode_to_keyval (g_unichar_toupper (symbol & 0x00ffffff));
return;
}
switch (symbol >> 8)
{
case 0: /* Latin 1 */
if ((symbol >= GDK_KEY_A) && (symbol <= GDK_KEY_Z))
xlower += (GDK_KEY_a - GDK_KEY_A);
else if ((symbol >= GDK_KEY_a) && (symbol <= GDK_KEY_z))
xupper -= (GDK_KEY_a - GDK_KEY_A);
else if ((symbol >= GDK_KEY_Agrave) && (symbol <= GDK_KEY_Odiaeresis))
xlower += (GDK_KEY_agrave - GDK_KEY_Agrave);
else if ((symbol >= GDK_KEY_agrave) && (symbol <= GDK_KEY_odiaeresis))
xupper -= (GDK_KEY_agrave - GDK_KEY_Agrave);
else if ((symbol >= GDK_KEY_Ooblique) && (symbol <= GDK_KEY_Thorn))
xlower += (GDK_KEY_oslash - GDK_KEY_Ooblique);
else if ((symbol >= GDK_KEY_oslash) && (symbol <= GDK_KEY_thorn))
xupper -= (GDK_KEY_oslash - GDK_KEY_Ooblique);
break;
case 1: /* Latin 2 */
/* Assume the KeySym is a legal value (ignore discontinuities) */
if (symbol == GDK_KEY_Aogonek)
xlower = GDK_KEY_aogonek;
else if (symbol >= GDK_KEY_Lstroke && symbol <= GDK_KEY_Sacute)
xlower += (GDK_KEY_lstroke - GDK_KEY_Lstroke);
else if (symbol >= GDK_KEY_Scaron && symbol <= GDK_KEY_Zacute)
xlower += (GDK_KEY_scaron - GDK_KEY_Scaron);
else if (symbol >= GDK_KEY_Zcaron && symbol <= GDK_KEY_Zabovedot)
xlower += (GDK_KEY_zcaron - GDK_KEY_Zcaron);
else if (symbol == GDK_KEY_aogonek)
xupper = GDK_KEY_Aogonek;
else if (symbol >= GDK_KEY_lstroke && symbol <= GDK_KEY_sacute)
xupper -= (GDK_KEY_lstroke - GDK_KEY_Lstroke);
else if (symbol >= GDK_KEY_scaron && symbol <= GDK_KEY_zacute)
xupper -= (GDK_KEY_scaron - GDK_KEY_Scaron);
else if (symbol >= GDK_KEY_zcaron && symbol <= GDK_KEY_zabovedot)
xupper -= (GDK_KEY_zcaron - GDK_KEY_Zcaron);
else if (symbol >= GDK_KEY_Racute && symbol <= GDK_KEY_Tcedilla)
xlower += (GDK_KEY_racute - GDK_KEY_Racute);
else if (symbol >= GDK_KEY_racute && symbol <= GDK_KEY_tcedilla)
xupper -= (GDK_KEY_racute - GDK_KEY_Racute);
break;
case 2: /* Latin 3 */
/* Assume the KeySym is a legal value (ignore discontinuities) */
if (symbol >= GDK_KEY_Hstroke && symbol <= GDK_KEY_Hcircumflex)
xlower += (GDK_KEY_hstroke - GDK_KEY_Hstroke);
else if (symbol >= GDK_KEY_Gbreve && symbol <= GDK_KEY_Jcircumflex)
xlower += (GDK_KEY_gbreve - GDK_KEY_Gbreve);
else if (symbol >= GDK_KEY_hstroke && symbol <= GDK_KEY_hcircumflex)
xupper -= (GDK_KEY_hstroke - GDK_KEY_Hstroke);
else if (symbol >= GDK_KEY_gbreve && symbol <= GDK_KEY_jcircumflex)
xupper -= (GDK_KEY_gbreve - GDK_KEY_Gbreve);
else if (symbol >= GDK_KEY_Cabovedot && symbol <= GDK_KEY_Scircumflex)
xlower += (GDK_KEY_cabovedot - GDK_KEY_Cabovedot);
else if (symbol >= GDK_KEY_cabovedot && symbol <= GDK_KEY_scircumflex)
xupper -= (GDK_KEY_cabovedot - GDK_KEY_Cabovedot);
break;
case 3: /* Latin 4 */
/* Assume the KeySym is a legal value (ignore discontinuities) */
if (symbol >= GDK_KEY_Rcedilla && symbol <= GDK_KEY_Tslash)
xlower += (GDK_KEY_rcedilla - GDK_KEY_Rcedilla);
else if (symbol >= GDK_KEY_rcedilla && symbol <= GDK_KEY_tslash)
xupper -= (GDK_KEY_rcedilla - GDK_KEY_Rcedilla);
else if (symbol == GDK_KEY_ENG)
xlower = GDK_KEY_eng;
else if (symbol == GDK_KEY_eng)
xupper = GDK_KEY_ENG;
else if (symbol >= GDK_KEY_Amacron && symbol <= GDK_KEY_Umacron)
xlower += (GDK_KEY_amacron - GDK_KEY_Amacron);
else if (symbol >= GDK_KEY_amacron && symbol <= GDK_KEY_umacron)
xupper -= (GDK_KEY_amacron - GDK_KEY_Amacron);
break;
case 6: /* Cyrillic */
/* Assume the KeySym is a legal value (ignore discontinuities) */
if (symbol >= GDK_KEY_Serbian_DJE && symbol <= GDK_KEY_Serbian_DZE)
xlower -= (GDK_KEY_Serbian_DJE - GDK_KEY_Serbian_dje);
else if (symbol >= GDK_KEY_Serbian_dje && symbol <= GDK_KEY_Serbian_dze)
xupper += (GDK_KEY_Serbian_DJE - GDK_KEY_Serbian_dje);
else if (symbol >= GDK_KEY_Cyrillic_YU && symbol <= GDK_KEY_Cyrillic_HARDSIGN)
xlower -= (GDK_KEY_Cyrillic_YU - GDK_KEY_Cyrillic_yu);
else if (symbol >= GDK_KEY_Cyrillic_yu && symbol <= GDK_KEY_Cyrillic_hardsign)
xupper += (GDK_KEY_Cyrillic_YU - GDK_KEY_Cyrillic_yu);
break;
case 7: /* Greek */
/* Assume the KeySym is a legal value (ignore discontinuities) */
if (symbol >= GDK_KEY_Greek_ALPHAaccent && symbol <= GDK_KEY_Greek_OMEGAaccent)
xlower += (GDK_KEY_Greek_alphaaccent - GDK_KEY_Greek_ALPHAaccent);
else if (symbol >= GDK_KEY_Greek_alphaaccent && symbol <= GDK_KEY_Greek_omegaaccent &&
symbol != GDK_KEY_Greek_iotaaccentdieresis &&
symbol != GDK_KEY_Greek_upsilonaccentdieresis)
xupper -= (GDK_KEY_Greek_alphaaccent - GDK_KEY_Greek_ALPHAaccent);
else if (symbol >= GDK_KEY_Greek_ALPHA && symbol <= GDK_KEY_Greek_OMEGA)
xlower += (GDK_KEY_Greek_alpha - GDK_KEY_Greek_ALPHA);
else if (symbol >= GDK_KEY_Greek_alpha && symbol <= GDK_KEY_Greek_omega &&
symbol != GDK_KEY_Greek_finalsmallsigma)
xupper -= (GDK_KEY_Greek_alpha - GDK_KEY_Greek_ALPHA);
break;
default:
break;
}
if (lower)
*lower = xlower;
if (upper)
*upper = xupper;
}
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