Commit 145fe4bd authored by Javier Jardón's avatar Javier Jardón Committed by Tristan Van Berkom

docs: Move documentation to inline comments: gdkkeys

parent 0b61aaac
......@@ -6,6 +6,7 @@ gdkdisplay.sgml
gdkdisplaymanager.sgml
gdkscreen.sgml
gdktesting.sgml
keys.sgml
pixbufs.sgml
regions.sgml
windows.sgml
<!-- ##### SECTION Title ##### -->
Key Values
<!-- ##### SECTION Short_Description ##### -->
Functions for manipulating keyboard codes
<!-- ##### SECTION Long_Description ##### -->
<para>
Key values are the codes which are sent whenever a key is pressed or released.
They appear in the <structfield>keyval</structfield> field of the
#GdkEventKey structure, which is passed to signal handlers for the
"key-press-event" and "key-release-event" signals.
The complete list of key values can be found in the <filename>&lt;gdk/gdkkeysyms.h&gt;</filename>
header file.
</para>
<para>
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).
</para>
<para>
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().
</para>
<para>
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().
</para>
<para>
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>
<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>
<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.
</para>
<para>
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.
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
</para>
<!-- ##### SECTION Stability_Level ##### -->
<!-- ##### SECTION Image ##### -->
<!-- ##### STRUCT GdkKeymap ##### -->
<para>
A <structname>GdkKeymap</structname> defines the translation from keyboard state
(including a hardware key, a modifier mask, and active keyboard group)
to a keyval. This translation has two phases. The first phase is
to determine the effective keyboard group and level for the keyboard
state; the second phase is to look up the keycode/group/level triplet
in the keymap and see what keyval it corresponds to.
</para>
<!-- ##### SIGNAL GdkKeymap::direction-changed ##### -->
<para>
</para>
@keymap: the object which received the signal.
<!-- ##### SIGNAL GdkKeymap::keys-changed ##### -->
<para>
</para>
@keymap: the object which received the signal.
<!-- ##### SIGNAL GdkKeymap::state-changed ##### -->
<para>
</para>
@gdkkeymap: the object which received the signal.
<!-- ##### STRUCT GdkKeymapKey ##### -->
<para>
A <structname>GdkKeymapKey</structname> is a hardware key that can
be mapped to a keyval.
</para>
@keycode: the hardware keycode. This is an identifying number for a
physical key.
@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.
@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.
<!-- ##### FUNCTION gdk_keymap_get_default ##### -->
<para>
</para>
@void:
@Returns:
<!-- ##### FUNCTION gdk_keymap_get_for_display ##### -->
<para>
</para>
@display:
@Returns:
<!-- ##### FUNCTION gdk_keymap_lookup_key ##### -->
<para>
</para>
@keymap:
@key:
@Returns:
<!-- ##### FUNCTION gdk_keymap_translate_keyboard_state ##### -->
<para>
</para>
@keymap:
@hardware_keycode:
@state:
@group:
@keyval:
@effective_group:
@level:
@consumed_modifiers:
@Returns:
<!-- ##### FUNCTION gdk_keymap_get_entries_for_keyval ##### -->
<para>
</para>
@keymap:
@keyval:
@keys:
@n_keys:
@Returns:
<!-- ##### FUNCTION gdk_keymap_get_entries_for_keycode ##### -->
<para>
</para>
@keymap:
@hardware_keycode:
@keys:
@keyvals:
@n_entries:
@Returns:
<!-- ##### FUNCTION gdk_keymap_get_direction ##### -->
<para>
Returns the direction of the keymap.
</para>
@keymap: a #GdkKeymap or %NULL to use the default keymap.
Returns: %PANGO_DIRECTION_LTR or %PANGO_DIRECTION_RTL.
@Returns: the direction of the keymap.
<!-- ##### FUNCTION gdk_keymap_have_bidi_layouts ##### -->
<para>
</para>
@keymap:
@Returns:
<!-- ##### FUNCTION gdk_keymap_get_caps_lock_state ##### -->
<para>
</para>
@keymap:
@Returns:
<!-- ##### FUNCTION gdk_keymap_get_num_lock_state ##### -->
<para>
</para>
@keymap:
@Returns:
<!-- ##### FUNCTION gdk_keymap_add_virtual_modifiers ##### -->
<para>
</para>
@keymap:
@state:
<!-- ##### FUNCTION gdk_keymap_map_virtual_modifiers ##### -->
<para>
</para>
@keymap:
@state:
@Returns:
<!-- ##### FUNCTION gdk_keyval_from_name ##### -->
<para>
Converts a key name to a key value.
</para>
@keyval_name: a key name.
@Returns: the corresponding key value, or %GDK_VoidSymbol if the key name is
not a valid key.
<!-- ##### FUNCTION gdk_keyval_convert_case ##### -->
<para>
</para>
@symbol:
@lower:
@upper:
<!-- ##### FUNCTION gdk_keyval_to_upper ##### -->
<para>
Converts a key value to upper case, if applicable.
</para>
@keyval: a key value.
@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.
<!-- ##### FUNCTION gdk_keyval_to_lower ##### -->
<para>
Converts a key value to lower case, if applicable.
</para>
@keyval: a key value.
@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.
<!-- ##### FUNCTION gdk_keyval_is_upper ##### -->
<para>
Returns %TRUE if the given key value is in upper case.
</para>
@keyval: a key value.
@Returns: %TRUE if @keyval is in upper case, or if @keyval is not subject to
case conversion.
<!-- ##### FUNCTION gdk_keyval_is_lower ##### -->
<para>
Returns %TRUE if the given key value is in lower case.
</para>
@keyval: a key value.
@Returns: %TRUE if @keyval is in lower case, or if @keyval is not subject to
case conversion.
<!-- ##### FUNCTION gdk_keyval_to_unicode ##### -->
<para>
</para>
@keyval:
@Returns:
<!-- ##### FUNCTION gdk_unicode_to_keyval ##### -->
<para>
</para>
@wc:
@Returns:
......@@ -31,6 +31,76 @@
#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,
......@@ -255,6 +325,15 @@ gdk_keyval_convert_case (guint symbol,
}
#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)
{
......@@ -265,6 +344,15 @@ gdk_keyval_to_upper (guint keyval)
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)
{
......@@ -275,6 +363,15 @@ gdk_keyval_to_lower (guint keyval)
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)
{
......@@ -288,6 +385,15 @@ gdk_keyval_is_upper (guint 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)
{
......@@ -303,10 +409,11 @@ gdk_keyval_is_lower (guint keyval)
/**
* gdk_keymap_get_default:
* @returns: the #GdkKeymap attached to the default display.
*
* Returns the #GdkKeymap attached to the default display.
**/
*
* Returns: the #GdkKeymap attached to the default display.
*/
GdkKeymap*
gdk_keymap_get_default (void)
{
......
......@@ -35,9 +35,26 @@
G_BEGIN_DECLS
typedef struct _GdkKeymapKey GdkKeymapKey;
/* GdkKeymapKey is a hardware key that can be mapped to a keyval */
/**
* GdkKeymapKey:
* @keycode: the hardware keycode. This is an identifying number for a
* physical key.
* @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.
* @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.
*
* A #GdkKeymapKey is a hardware key that can be mapped to a keyval.
*/
struct _GdkKeymapKey
{
guint keycode;
......@@ -45,16 +62,6 @@ struct _GdkKeymapKey
gint level;
};
/* A GdkKeymap defines the translation from keyboard state
* (including a hardware key, a modifier mask, and active keyboard group)
* to a keyval. This translation has two phases. The first phase is
* to determine the effective keyboard group and level for the keyboard
* state; the second phase is to look up the keycode/group/level triplet
* in the keymap and see what keyval it corresponds to.
*/
typedef struct _GdkKeymap GdkKeymap;
typedef struct _GdkKeymapClass GdkKeymapClass;
#define GDK_TYPE_KEYMAP (gdk_keymap_get_type ())
#define GDK_KEYMAP(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_KEYMAP, GdkKeymap))
......@@ -63,6 +70,19 @@ typedef struct _GdkKeymapClass GdkKeymapClass;
#define GDK_IS_KEYMAP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_KEYMAP))
#define GDK_KEYMAP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_KEYMAP, GdkKeymapClass))
typedef struct _GdkKeymap GdkKeymap;
typedef struct _GdkKeymapClass GdkKeymapClass;
/**
* GdkKeymap:
*
* A #GdkKeymap defines the translation from keyboard state
* (including a hardware key, a modifier mask, and active keyboard group)
* to a keyval. This translation has two phases. The first phase is
* to determine the effective keyboard group and level for the keyboard
* state; the second phase is to look up the keycode/group/level triplet
* in the keymap and see what keyval it corresponds to.
*/
struct _GdkKeymap
{
GObject parent_instance;
......@@ -105,6 +125,16 @@ gboolean gdk_keymap_get_entries_for_keycode (GdkKeymap *keymap,
GdkKeymapKey **keys,
guint **keyvals,
gint *n_entries);
/**
* gdk_keymap_get_direction:
* @keymap: a #GdkKeymap or %NULL to use the default keymap.
*
* Returns the direction of the keymap.
*
* Returns: the direction of the keymap, %PANGO_DIRECTION_LTR or
* %PANGO_DIRECTION_RTL.
*/
PangoDirection gdk_keymap_get_direction (GdkKeymap *keymap);
gboolean gdk_keymap_have_bidi_layouts (GdkKeymap *keymap);
gboolean gdk_keymap_get_caps_lock_state (GdkKeymap *keymap);
......@@ -117,6 +147,16 @@ gboolean gdk_keymap_map_virtual_modifiers (GdkKeymap *keymap,
/* Key values
*/
gchar* gdk_keyval_name (guint keyval) G_GNUC_CONST;
/**
* gdk_keyval_from_name:
* @keyval_name: a key name.
*
* Converts a key name to a key value.
*
* Returns: the corresponding key value, or %GDK_VoidSymbol if the key name is
* not a valid key.
*/
guint gdk_keyval_from_name (const gchar *keyval_name);
void gdk_keyval_convert_case (guint symbol,
guint *lower,
......
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