gtk/gdk/gdkkeys.c
Milan Bouchet-Valat 2e3935ba9d Fix missing (transfer) annotations in GDK
Mostly missing (transfer none).
2010-11-24 21:37:20 +01:00

422 lines
15 KiB
C

/* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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 "gdkkeys.h"
#include "gdkdisplay.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, which is passed to signal handlers for the
* #GtkWidget::key-press-event and #GtkWidget::key-release-event signals.
* The complete list of key values can be found in the
* <filename>&lt;gdk/gdkkeysyms.h&gt;</filename> 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().
*
* <para id="key-group-explanation">
* One #GdkKeymap object exists for each user display. gdk_keymap_get_default()
* returns the #GdkKeymap for the default display; to obtain keymaps for other
* displays, use gdk_keymap_get_for_display(). 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
* <firstterm>level</firstterm> 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.
* </para>
*
* 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 {
DIRECTION_CHANGED,
KEYS_CHANGED,
STATE_CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE (GdkKeymap, gdk_keymap, G_TYPE_OBJECT)
static void
gdk_keymap_class_init (GdkKeymapClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
/**
* 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.
*
* Since: 2.0
*/
signals[DIRECTION_CHANGED] =
g_signal_new ("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.
*
* Since: 2.2
*/
signals[KEYS_CHANGED] =
g_signal_new ("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().
*
* Since: 2.16
*/
signals[STATE_CHANGED] =
g_signal_new ("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)
{
}
/* Other key-handling stuff
*/
#ifndef HAVE_XCONVERTCASE
#include "gdkkeysyms.h"
/* compatibility function from X11R6.3, since XConvertCase is not
* supplied by X11R5.
*/
/**
* 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 = symbol;
guint 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;
}
if (lower)
*lower = xlower;
if (upper)
*upper = xupper;
}
#endif
/**
* 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_default:
*
* Returns the #GdkKeymap attached to the default display.
*
* Returns: (transfer none): the #GdkKeymap attached to the default display.
*/
GdkKeymap*
gdk_keymap_get_default (void)
{
return gdk_keymap_get_for_display (gdk_display_get_default ());
}