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godot/thirdparty/linuxbsd_headers/xkbcommon/xkbcommon.h

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[Linux/BSD] Include headers for dynamically loaded libraries to simplify build dependencies.
2023-01-12 08:49:20 +00:00
/*
* Copyright 1985, 1987, 1990, 1998 The Open Group
* Copyright 2008 Dan Nicholson
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the names of the authors or their
* institutions shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization from the authors.
*/
/************************************************************
* Copyright (c) 1993 by Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of Silicon Graphics not be
* used in advertising or publicity pertaining to distribution
* of the software without specific prior written permission.
* Silicon Graphics makes no representation about the suitability
* of this software for any purpose. It is provided "as is"
* without any express or implied warranty.
*
* SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
********************************************************/
/*
* Copyright © 2009-2012 Daniel Stone
* Copyright © 2012 Intel Corporation
* Copyright © 2012 Ran Benita
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Daniel Stone <daniel@fooishbar.org>
*/
#ifndef _XKBCOMMON_H_
#define _XKBCOMMON_H_
#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>
#include <xkbcommon/xkbcommon-names.h>
#include <xkbcommon/xkbcommon-keysyms.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @file
* Main libxkbcommon API.
*/
/**
* @struct xkb_context
* Opaque top level library context object.
*
* The context contains various general library data and state, like
* logging level and include paths.
*
* Objects are created in a specific context, and multiple contexts may
* coexist simultaneously. Objects from different contexts are completely
* separated and do not share any memory or state.
*/
struct xkb_context;
/**
* @struct xkb_keymap
* Opaque compiled keymap object.
*
* The keymap object holds all of the static keyboard information obtained
* from compiling XKB files.
*
* A keymap is immutable after it is created (besides reference counts, etc.);
* if you need to change it, you must create a new one.
*/
struct xkb_keymap;
/**
* @struct xkb_state
* Opaque keyboard state object.
*
* State objects contain the active state of a keyboard (or keyboards), such
* as the currently effective layout and the active modifiers. It acts as a
* simple state machine, wherein key presses and releases are the input, and
* key symbols (keysyms) are the output.
*/
struct xkb_state;
/**
* A number used to represent a physical key on a keyboard.
*
* A standard PC-compatible keyboard might have 102 keys. An appropriate
* keymap would assign each of them a keycode, by which the user should
* refer to the key throughout the library.
*
* Historically, the X11 protocol, and consequentially the XKB protocol,
* assign only 8 bits for keycodes. This limits the number of different
* keys that can be used simultaneously in a single keymap to 256
* (disregarding other limitations). This library does not share this limit;
* keycodes beyond 255 ('extended keycodes') are not treated specially.
* Keymaps and applications which are compatible with X11 should not use
* these keycodes.
*
* The values of specific keycodes are determined by the keymap and the
* underlying input system. For example, with an X11-compatible keymap
* and Linux evdev scan codes (see linux/input.h), a fixed offset is used:
*
* The keymap defines a canonical name for each key, plus possible aliases.
* Historically, the XKB protocol restricts these names to at most 4 (ASCII)
* characters, but this library does not share this limit.
*
* @code
* xkb_keycode_t keycode_A = KEY_A + 8;
* @endcode
*
* @sa xkb_keycode_is_legal_ext() xkb_keycode_is_legal_x11()
*/
typedef uint32_t xkb_keycode_t;
/**
* A number used to represent the symbols generated from a key on a keyboard.
*
* A key, represented by a keycode, may generate different symbols according
* to keyboard state. For example, on a QWERTY keyboard, pressing the key
* labled \<A\> generates the symbol 'a'. If the Shift key is held, it
* generates the symbol 'A'. If a different layout is used, say Greek,
* it generates the symbol 'α'. And so on.
*
* Each such symbol is represented by a keysym. Note that keysyms are
* somewhat more general, in that they can also represent some "function",
* such as "Left" or "Right" for the arrow keys. For more information,
* see:
* https://www.x.org/releases/current/doc/xproto/x11protocol.html#keysym_encoding
*
* Specifically named keysyms can be found in the
* xkbcommon/xkbcommon-keysyms.h header file. Their name does not include
* the XKB_KEY_ prefix.
*
* Besides those, any Unicode/ISO 10646 character in the range U0100 to
* U10FFFF can be represented by a keysym value in the range 0x01000100 to
* 0x0110FFFF. The name of Unicode keysyms is "U<codepoint>", e.g. "UA1B2".
*
* The name of other unnamed keysyms is the hexadecimal representation of
* their value, e.g. "0xabcd1234".
*
* Keysym names are case-sensitive.
*/
typedef uint32_t xkb_keysym_t;
/**
* Index of a keyboard layout.
*
* The layout index is a state component which detemines which <em>keyboard
* layout</em> is active. These may be different alphabets, different key
* arrangements, etc.
*
* Layout indices are consecutive. The first layout has index 0.
*
* Each layout is not required to have a name, and the names are not
* guaranteed to be unique (though they are usually provided and unique).
* Therefore, it is not safe to use the name as a unique identifier for a
* layout. Layout names are case-sensitive.
*
* Layout names are specified in the layout's definition, for example
* "English (US)". These are different from the (conventionally) short names
* which are used to locate the layout, for example "us" or "us(intl)". These
* names are not present in a compiled keymap.
*
* If the user selects layouts from a list generated from the XKB registry
* (using libxkbregistry or directly), and this metadata is needed later on, it
* is recommended to store it along with the keymap.
*
* Layouts are also called "groups" by XKB.
*
* @sa xkb_keymap_num_layouts() xkb_keymap_num_layouts_for_key()
*/
typedef uint32_t xkb_layout_index_t;
/** A mask of layout indices. */
typedef uint32_t xkb_layout_mask_t;
/**
* Index of a shift level.
*
* Any key, in any layout, can have several <em>shift levels</em>. Each
* shift level can assign different keysyms to the key. The shift level
* to use is chosen according to the current keyboard state; for example,
* if no keys are pressed, the first level may be used; if the Left Shift
* key is pressed, the second; if Num Lock is pressed, the third; and
* many such combinations are possible (see xkb_mod_index_t).
*
* Level indices are consecutive. The first level has index 0.
*/
typedef uint32_t xkb_level_index_t;
/**
* Index of a modifier.
*
* A @e modifier is a state component which changes the way keys are
* interpreted. A keymap defines a set of modifiers, such as Alt, Shift,
* Num Lock or Meta, and specifies which keys may @e activate which
* modifiers (in a many-to-many relationship, i.e. a key can activate
* several modifiers, and a modifier may be activated by several keys.
* Different keymaps do this differently).
*
* When retrieving the keysyms for a key, the active modifier set is
* consulted; this detemines the correct shift level to use within the
* currently active layout (see xkb_level_index_t).
*
* Modifier indices are consecutive. The first modifier has index 0.
*
* Each modifier must have a name, and the names are unique. Therefore, it
* is safe to use the name as a unique identifier for a modifier. The names
* of some common modifiers are provided in the xkbcommon/xkbcommon-names.h
* header file. Modifier names are case-sensitive.
*
* @sa xkb_keymap_num_mods()
*/
typedef uint32_t xkb_mod_index_t;
/** A mask of modifier indices. */
typedef uint32_t xkb_mod_mask_t;
/**
* Index of a keyboard LED.
*
* LEDs are logical objects which may be @e active or @e inactive. They
* typically correspond to the lights on the keyboard. Their state is
* determined by the current keyboard state.
*
* LED indices are non-consecutive. The first LED has index 0.
*
* Each LED must have a name, and the names are unique. Therefore,
* it is safe to use the name as a unique identifier for a LED. The names
* of some common LEDs are provided in the xkbcommon/xkbcommon-names.h
* header file. LED names are case-sensitive.
*
* @warning A given keymap may specify an exact index for a given LED.
* Therefore, LED indexing is not necessarily sequential, as opposed to
* modifiers and layouts. This means that when iterating over the LEDs
* in a keymap using e.g. xkb_keymap_num_leds(), some indices might be
* invalid. Given such an index, functions like xkb_keymap_led_get_name()
* will return NULL, and xkb_state_led_index_is_active() will return -1.
*
* LEDs are also called "indicators" by XKB.
*
* @sa xkb_keymap_num_leds()
*/
typedef uint32_t xkb_led_index_t;
/** A mask of LED indices. */
typedef uint32_t xkb_led_mask_t;
#define XKB_KEYCODE_INVALID (0xffffffff)
#define XKB_LAYOUT_INVALID (0xffffffff)
#define XKB_LEVEL_INVALID (0xffffffff)
#define XKB_MOD_INVALID (0xffffffff)
#define XKB_LED_INVALID (0xffffffff)
#define XKB_KEYCODE_MAX (0xffffffff - 1)
/**
* Test whether a value is a valid extended keycode.
* @sa xkb_keycode_t
**/
#define xkb_keycode_is_legal_ext(key) (key <= XKB_KEYCODE_MAX)
/**
* Test whether a value is a valid X11 keycode.
* @sa xkb_keycode_t
*/
#define xkb_keycode_is_legal_x11(key) (key >= 8 && key <= 255)
/**
* Names to compile a keymap with, also known as RMLVO.
*
* The names are the common configuration values by which a user picks
* a keymap.
*
* If the entire struct is NULL, then each field is taken to be NULL.
* You should prefer passing NULL instead of choosing your own defaults.
*/
struct xkb_rule_names {
/**
* The rules file to use. The rules file describes how to interpret
* the values of the model, layout, variant and options fields.
*
* If NULL or the empty string "", a default value is used.
* If the XKB_DEFAULT_RULES environment variable is set, it is used
* as the default. Otherwise the system default is used.
*/
const char *rules;
/**
* The keyboard model by which to interpret keycodes and LEDs.
*
* If NULL or the empty string "", a default value is used.
* If the XKB_DEFAULT_MODEL environment variable is set, it is used
* as the default. Otherwise the system default is used.
*/
const char *model;
/**
* A comma separated list of layouts (languages) to include in the
* keymap.
*
* If NULL or the empty string "", a default value is used.
* If the XKB_DEFAULT_LAYOUT environment variable is set, it is used
* as the default. Otherwise the system default is used.
*/
const char *layout;
/**
* A comma separated list of variants, one per layout, which may
* modify or augment the respective layout in various ways.
*
* Generally, should either be empty or have the same number of values
* as the number of layouts. You may use empty values as in "intl,,neo".
*
* If NULL or the empty string "", and a default value is also used
* for the layout, a default value is used. Otherwise no variant is
* used.
* If the XKB_DEFAULT_VARIANT environment variable is set, it is used
* as the default. Otherwise the system default is used.
*/
const char *variant;
/**
* A comma separated list of options, through which the user specifies
* non-layout related preferences, like which key combinations are used
* for switching layouts, or which key is the Compose key.
*
* If NULL, a default value is used. If the empty string "", no
* options are used.
* If the XKB_DEFAULT_OPTIONS environment variable is set, it is used
* as the default. Otherwise the system default is used.
*/
const char *options;
};
/**
* @defgroup keysyms Keysyms
* Utility functions related to keysyms.
*
* @{
*/
/**
* @page keysym-transformations Keysym Transformations
*
* Keysym translation is subject to several "keysym transformations",
* as described in the XKB specification. These are:
*
* - Capitalization transformation. If the Caps Lock modifier is
* active and was not consumed by the translation process, a single
* keysym is transformed to its upper-case form (if applicable).
* Similarly, the UTF-8/UTF-32 string produced is capitalized.
*
* This is described in:
* https://www.x.org/releases/current/doc/kbproto/xkbproto.html#Interpreting_the_Lock_Modifier
*
* - Control transformation. If the Control modifier is active and
* was not consumed by the translation process, the string produced
* is transformed to its matching ASCII control character (if
* applicable). Keysyms are not affected.
*
* This is described in:
* https://www.x.org/releases/current/doc/kbproto/xkbproto.html#Interpreting_the_Control_Modifier
*
* Each relevant function discusses which transformations it performs.
*
* These transformations are not applicable when a key produces multiple
* keysyms.
*/
/**
* Get the name of a keysym.
*
* For a description of how keysyms are named, see @ref xkb_keysym_t.
*
* @param[in] keysym The keysym.
* @param[out] buffer A string buffer to write the name into.
* @param[in] size Size of the buffer.
*
* @warning If the buffer passed is too small, the string is truncated
* (though still NUL-terminated); a size of at least 64 bytes is recommended.
*
* @returns The number of bytes in the name, excluding the NUL byte. If
* the keysym is invalid, returns -1.
*
* You may check if truncation has occurred by comparing the return value
* with the length of buffer, similarly to the snprintf(3) function.
*
* @sa xkb_keysym_t
*/
int
xkb_keysym_get_name(xkb_keysym_t keysym, char *buffer, size_t size);
/** Flags for xkb_keysym_from_name(). */
enum xkb_keysym_flags {
/** Do not apply any flags. */
XKB_KEYSYM_NO_FLAGS = 0,
/** Find keysym by case-insensitive search. */
XKB_KEYSYM_CASE_INSENSITIVE = (1 << 0)
};
/**
* Get a keysym from its name.
*
* @param name The name of a keysym. See remarks in xkb_keysym_get_name();
* this function will accept any name returned by that function.
* @param flags A set of flags controlling how the search is done. If
* invalid flags are passed, this will fail with XKB_KEY_NoSymbol.
*
* If you use the XKB_KEYSYM_CASE_INSENSITIVE flag and two keysym names
* differ only by case, then the lower-case keysym is returned. For
* instance, for KEY_a and KEY_A, this function would return KEY_a for the
* case-insensitive search. If this functionality is needed, it is
* recommended to first call this function without this flag; and if that
* fails, only then to try with this flag, while possibly warning the user
* he had misspelled the name, and might get wrong results.
*
* Case folding is done according to the C locale; the current locale is not
* consulted.
*
* @returns The keysym. If the name is invalid, returns XKB_KEY_NoSymbol.
*
* @sa xkb_keysym_t
*/
xkb_keysym_t
xkb_keysym_from_name(const char *name, enum xkb_keysym_flags flags);
/**
* Get the Unicode/UTF-8 representation of a keysym.
*
* @param[in] keysym The keysym.
* @param[out] buffer A buffer to write the UTF-8 string into.
* @param[in] size The size of buffer. Must be at least 7.
*
* @returns The number of bytes written to the buffer (including the
* terminating byte). If the keysym does not have a Unicode
* representation, returns 0. If the buffer is too small, returns -1.
*
* This function does not perform any @ref keysym-transformations.
* Therefore, prefer to use xkb_state_key_get_utf8() if possible.
*
* @sa xkb_state_key_get_utf8()
*/
int
xkb_keysym_to_utf8(xkb_keysym_t keysym, char *buffer, size_t size);
/**
* Get the Unicode/UTF-32 representation of a keysym.
*
* @returns The Unicode/UTF-32 representation of keysym, which is also
* compatible with UCS-4. If the keysym does not have a Unicode
* representation, returns 0.
*
* This function does not perform any @ref keysym-transformations.
* Therefore, prefer to use xkb_state_key_get_utf32() if possible.
*
* @sa xkb_state_key_get_utf32()
*/
uint32_t
xkb_keysym_to_utf32(xkb_keysym_t keysym);
/**
* Get the keysym corresponding to a Unicode/UTF-32 codepoint.
*
* @returns The keysym corresponding to the specified Unicode
* codepoint, or XKB_KEY_NoSymbol if there is none.
*
* This function is the inverse of @ref xkb_keysym_to_utf32. In cases
* where a single codepoint corresponds to multiple keysyms, returns
* the keysym with the lowest value.
*
* Unicode codepoints which do not have a special (legacy) keysym
* encoding use a direct encoding scheme. These keysyms don't usually
* have an associated keysym constant (XKB_KEY_*).
*
* For noncharacter Unicode codepoints and codepoints outside of the
* defined Unicode planes this function returns XKB_KEY_NoSymbol.
*
* @sa xkb_keysym_to_utf32()
* @since 1.0.0
*/
xkb_keysym_t
xkb_utf32_to_keysym(uint32_t ucs);
/**
* Convert a keysym to its uppercase form.
*
* If there is no such form, the keysym is returned unchanged.
*
* The conversion rules may be incomplete; prefer to work with the Unicode
* representation instead, when possible.
*/
xkb_keysym_t
xkb_keysym_to_upper(xkb_keysym_t ks);
/**
* Convert a keysym to its lowercase form.
*
* The conversion rules may be incomplete; prefer to work with the Unicode
* representation instead, when possible.
*/
xkb_keysym_t
xkb_keysym_to_lower(xkb_keysym_t ks);
/** @} */
/**
* @defgroup context Library Context
* Creating, destroying and using library contexts.
*
* Every keymap compilation request must have a context associated with
* it. The context keeps around state such as the include path.
*
* @{
*/
/**
* @page envvars Environment Variables
*
* The user may set some environment variables which affect the library:
*
* - `XKB_CONFIG_ROOT`, `XKB_CONFIG_EXTRA_PATH`, `XDG_CONFIG_DIR`, `HOME` - see @ref include-path.
* - `XKB_LOG_LEVEL` - see xkb_context_set_log_level().
* - `XKB_LOG_VERBOSITY` - see xkb_context_set_log_verbosity().
* - `XKB_DEFAULT_RULES`, `XKB_DEFAULT_MODEL`, `XKB_DEFAULT_LAYOUT`,
* `XKB_DEFAULT_VARIANT`, `XKB_DEFAULT_OPTIONS` - see xkb_rule_names.
*/
/** Flags for context creation. */
enum xkb_context_flags {
/** Do not apply any context flags. */
XKB_CONTEXT_NO_FLAGS = 0,
/** Create this context with an empty include path. */
XKB_CONTEXT_NO_DEFAULT_INCLUDES = (1 << 0),
/**
* Don't take RMLVO names from the environment.
* @since 0.3.0
*/
XKB_CONTEXT_NO_ENVIRONMENT_NAMES = (1 << 1)
};
/**
* Create a new context.
*
* @param flags Optional flags for the context, or 0.
*
* @returns A new context, or NULL on failure.
*
* @memberof xkb_context
*/
struct xkb_context *
xkb_context_new(enum xkb_context_flags flags);
/**
* Take a new reference on a context.
*
* @returns The passed in context.
*
* @memberof xkb_context
*/
struct xkb_context *
xkb_context_ref(struct xkb_context *context);
/**
* Release a reference on a context, and possibly free it.
*
* @param context The context. If it is NULL, this function does nothing.
*
* @memberof xkb_context
*/
void
xkb_context_unref(struct xkb_context *context);
/**
* Store custom user data in the context.
*
* This may be useful in conjunction with xkb_context_set_log_fn() or other
* callbacks.
*
* @memberof xkb_context
*/
void
xkb_context_set_user_data(struct xkb_context *context, void *user_data);
/**
* Retrieves stored user data from the context.
*
* @returns The stored user data. If the user data wasn't set, or the
* passed in context is NULL, returns NULL.
*
* This may be useful to access private user data from callbacks like a
* custom logging function.
*
* @memberof xkb_context
**/
void *
xkb_context_get_user_data(struct xkb_context *context);
/** @} */
/**
* @defgroup include-path Include Paths
* Manipulating the include paths in a context.
*
* The include paths are the file-system paths that are searched when an
* include statement is encountered during keymap compilation.
*
* The default include paths are, in that lookup order:
* - The path `$XDG_CONFIG_HOME/xkb`, with the usual `XDG_CONFIG_HOME`
* fallback to `$HOME/.config/` if unset.
* - The path `$HOME/.xkb`, where $HOME is the value of the environment
* variable `HOME`.
* - The `XKB_CONFIG_EXTRA_PATH` environment variable, if defined, otherwise the
* system configuration directory, defined at library configuration time
* (usually `/etc/xkb`).
* - The `XKB_CONFIG_ROOT` environment variable, if defined, otherwise
* the system XKB root, defined at library configuration time.
*
* @{
*/
/**
* Append a new entry to the context's include path.
*
* @returns 1 on success, or 0 if the include path could not be added or is
* inaccessible.
*
* @memberof xkb_context
*/
int
xkb_context_include_path_append(struct xkb_context *context, const char *path);
/**
* Append the default include paths to the context's include path.
*
* @returns 1 on success, or 0 if the primary include path could not be added.
*
* @memberof xkb_context
*/
int
xkb_context_include_path_append_default(struct xkb_context *context);
/**
* Reset the context's include path to the default.
*
* Removes all entries from the context's include path, and inserts the
* default paths.
*
* @returns 1 on success, or 0 if the primary include path could not be added.
*
* @memberof xkb_context
*/
int
xkb_context_include_path_reset_defaults(struct xkb_context *context);
/**
* Remove all entries from the context's include path.
*
* @memberof xkb_context
*/
void
xkb_context_include_path_clear(struct xkb_context *context);
/**
* Get the number of paths in the context's include path.
*
* @memberof xkb_context
*/
unsigned int
xkb_context_num_include_paths(struct xkb_context *context);
/**
* Get a specific include path from the context's include path.
*
* @returns The include path at the specified index. If the index is
* invalid, returns NULL.
*
* @memberof xkb_context
*/
const char *
xkb_context_include_path_get(struct xkb_context *context, unsigned int index);
/** @} */
/**
* @defgroup logging Logging Handling
* Manipulating how logging from this library is handled.
*
* @{
*/
/** Specifies a logging level. */
enum xkb_log_level {
XKB_LOG_LEVEL_CRITICAL = 10, /**< Log critical internal errors only. */
XKB_LOG_LEVEL_ERROR = 20, /**< Log all errors. */
XKB_LOG_LEVEL_WARNING = 30, /**< Log warnings and errors. */
XKB_LOG_LEVEL_INFO = 40, /**< Log information, warnings, and errors. */
XKB_LOG_LEVEL_DEBUG = 50 /**< Log everything. */
};
/**
* Set the current logging level.
*
* @param context The context in which to set the logging level.
* @param level The logging level to use. Only messages from this level
* and below will be logged.
*
* The default level is XKB_LOG_LEVEL_ERROR. The environment variable
* XKB_LOG_LEVEL, if set in the time the context was created, overrides the
* default value. It may be specified as a level number or name.
*
* @memberof xkb_context
*/
void
xkb_context_set_log_level(struct xkb_context *context,
enum xkb_log_level level);
/**
* Get the current logging level.
*
* @memberof xkb_context
*/
enum xkb_log_level
xkb_context_get_log_level(struct xkb_context *context);
/**
* Sets the current logging verbosity.
*
* The library can generate a number of warnings which are not helpful to
* ordinary users of the library. The verbosity may be increased if more
* information is desired (e.g. when developing a new keymap).
*
* The default verbosity is 0. The environment variable XKB_LOG_VERBOSITY,
* if set in the time the context was created, overrides the default value.
*
* @param context The context in which to use the set verbosity.
* @param verbosity The verbosity to use. Currently used values are
* 1 to 10, higher values being more verbose. 0 would result in no verbose
* messages being logged.
*
* Most verbose messages are of level XKB_LOG_LEVEL_WARNING or lower.
*
* @memberof xkb_context
*/
void
xkb_context_set_log_verbosity(struct xkb_context *context, int verbosity);
/**
* Get the current logging verbosity of the context.
*
* @memberof xkb_context
*/
int
xkb_context_get_log_verbosity(struct xkb_context *context);
/**
* Set a custom function to handle logging messages.
*
* @param context The context in which to use the set logging function.
* @param log_fn The function that will be called for logging messages.
* Passing NULL restores the default function, which logs to stderr.
*
* By default, log messages from this library are printed to stderr. This
* function allows you to replace the default behavior with a custom
* handler. The handler is only called with messages which match the
* current logging level and verbosity settings for the context.
* level is the logging level of the message. @a format and @a args are
* the same as in the vprintf(3) function.
*
* You may use xkb_context_set_user_data() on the context, and then call
* xkb_context_get_user_data() from within the logging function to provide
* it with additional private context.
*
* @memberof xkb_context
*/
void
xkb_context_set_log_fn(struct xkb_context *context,
void (*log_fn)(struct xkb_context *context,
enum xkb_log_level level,
const char *format, va_list args));
/** @} */
/**
* @defgroup keymap Keymap Creation
* Creating and destroying keymaps.
*
* @{
*/
/** Flags for keymap compilation. */
enum xkb_keymap_compile_flags {
/** Do not apply any flags. */
XKB_KEYMAP_COMPILE_NO_FLAGS = 0
};
/**
* Create a keymap from RMLVO names.
*
* The primary keymap entry point: creates a new XKB keymap from a set of
* RMLVO (Rules + Model + Layouts + Variants + Options) names.
*
* @param context The context in which to create the keymap.
* @param names The RMLVO names to use. See xkb_rule_names.
* @param flags Optional flags for the keymap, or 0.
*
* @returns A keymap compiled according to the RMLVO names, or NULL if
* the compilation failed.
*
* @sa xkb_rule_names
* @memberof xkb_keymap
*/
struct xkb_keymap *
xkb_keymap_new_from_names(struct xkb_context *context,
const struct xkb_rule_names *names,
enum xkb_keymap_compile_flags flags);
/** The possible keymap formats. */
enum xkb_keymap_format {
/** The current/classic XKB text format, as generated by xkbcomp -xkb. */
XKB_KEYMAP_FORMAT_TEXT_V1 = 1
};
/**
* Create a keymap from a keymap file.
*
* @param context The context in which to create the keymap.
* @param file The keymap file to compile.
* @param format The text format of the keymap file to compile.
* @param flags Optional flags for the keymap, or 0.
*
* @returns A keymap compiled from the given XKB keymap file, or NULL if
* the compilation failed.
*
* The file must contain a complete keymap. For example, in the
* XKB_KEYMAP_FORMAT_TEXT_V1 format, this means the file must contain one
* top level '%xkb_keymap' section, which in turn contains other required
* sections.
*
* @memberof xkb_keymap
*/
struct xkb_keymap *
xkb_keymap_new_from_file(struct xkb_context *context, FILE *file,
enum xkb_keymap_format format,
enum xkb_keymap_compile_flags flags);
/**
* Create a keymap from a keymap string.
*
* This is just like xkb_keymap_new_from_file(), but instead of a file, gets
* the keymap as one enormous string.
*
* @see xkb_keymap_new_from_file()
* @memberof xkb_keymap
*/
struct xkb_keymap *
xkb_keymap_new_from_string(struct xkb_context *context, const char *string,
enum xkb_keymap_format format,
enum xkb_keymap_compile_flags flags);
/**
* Create a keymap from a memory buffer.
*
* This is just like xkb_keymap_new_from_string(), but takes a length argument
* so the input string does not have to be zero-terminated.
*
* @see xkb_keymap_new_from_string()
* @memberof xkb_keymap
* @since 0.3.0
*/
struct xkb_keymap *
xkb_keymap_new_from_buffer(struct xkb_context *context, const char *buffer,
size_t length, enum xkb_keymap_format format,
enum xkb_keymap_compile_flags flags);
/**
* Take a new reference on a keymap.
*
* @returns The passed in keymap.
*
* @memberof xkb_keymap
*/
struct xkb_keymap *
xkb_keymap_ref(struct xkb_keymap *keymap);
/**
* Release a reference on a keymap, and possibly free it.
*
* @param keymap The keymap. If it is NULL, this function does nothing.
*
* @memberof xkb_keymap
*/
void
xkb_keymap_unref(struct xkb_keymap *keymap);
/**
* Get the keymap as a string in the format from which it was created.
* @sa xkb_keymap_get_as_string()
**/
#define XKB_KEYMAP_USE_ORIGINAL_FORMAT ((enum xkb_keymap_format) -1)
/**
* Get the compiled keymap as a string.
*
* @param keymap The keymap to get as a string.
* @param format The keymap format to use for the string. You can pass
* in the special value XKB_KEYMAP_USE_ORIGINAL_FORMAT to use the format
* from which the keymap was originally created.
*
* @returns The keymap as a NUL-terminated string, or NULL if unsuccessful.
*
* The returned string may be fed back into xkb_keymap_new_from_string() to get
* the exact same keymap (possibly in another process, etc.).
*
* The returned string is dynamically allocated and should be freed by the
* caller.
*
* @memberof xkb_keymap
*/
char *
xkb_keymap_get_as_string(struct xkb_keymap *keymap,
enum xkb_keymap_format format);
/** @} */
/**
* @defgroup components Keymap Components
* Enumeration of state components in a keymap.
*
* @{
*/
/**
* Get the minimum keycode in the keymap.
*
* @sa xkb_keycode_t
* @memberof xkb_keymap
* @since 0.3.1
*/
xkb_keycode_t
xkb_keymap_min_keycode(struct xkb_keymap *keymap);
/**
* Get the maximum keycode in the keymap.
*
* @sa xkb_keycode_t
* @memberof xkb_keymap
* @since 0.3.1
*/
xkb_keycode_t
xkb_keymap_max_keycode(struct xkb_keymap *keymap);
/**
* The iterator used by xkb_keymap_key_for_each().
*
* @sa xkb_keymap_key_for_each
* @memberof xkb_keymap
* @since 0.3.1
*/
typedef void
(*xkb_keymap_key_iter_t)(struct xkb_keymap *keymap, xkb_keycode_t key,
void *data);
/**
* Run a specified function for every valid keycode in the keymap. If a
* keymap is sparse, this function may be called fewer than
* (max_keycode - min_keycode + 1) times.
*
* @sa xkb_keymap_min_keycode() xkb_keymap_max_keycode() xkb_keycode_t
* @memberof xkb_keymap
* @since 0.3.1
*/
void
xkb_keymap_key_for_each(struct xkb_keymap *keymap, xkb_keymap_key_iter_t iter,
void *data);
/**
* Find the name of the key with the given keycode.
*
* This function always returns the canonical name of the key (see
* description in xkb_keycode_t).
*
* @returns The key name. If no key with this keycode exists,
* returns NULL.
*
* @sa xkb_keycode_t
* @memberof xkb_keymap
* @since 0.6.0
*/
const char *
xkb_keymap_key_get_name(struct xkb_keymap *keymap, xkb_keycode_t key);
/**
* Find the keycode of the key with the given name.
*
* The name can be either a canonical name or an alias.
*
* @returns The keycode. If no key with this name exists,
* returns XKB_KEYCODE_INVALID.
*
* @sa xkb_keycode_t
* @memberof xkb_keymap
* @since 0.6.0
*/
xkb_keycode_t
xkb_keymap_key_by_name(struct xkb_keymap *keymap, const char *name);
/**
* Get the number of modifiers in the keymap.
*
* @sa xkb_mod_index_t
* @memberof xkb_keymap
*/
xkb_mod_index_t
xkb_keymap_num_mods(struct xkb_keymap *keymap);
/**
* Get the name of a modifier by index.
*
* @returns The name. If the index is invalid, returns NULL.
*
* @sa xkb_mod_index_t
* @memberof xkb_keymap
*/
const char *
xkb_keymap_mod_get_name(struct xkb_keymap *keymap, xkb_mod_index_t idx);
/**
* Get the index of a modifier by name.
*
* @returns The index. If no modifier with this name exists, returns
* XKB_MOD_INVALID.
*
* @sa xkb_mod_index_t
* @memberof xkb_keymap
*/
xkb_mod_index_t
xkb_keymap_mod_get_index(struct xkb_keymap *keymap, const char *name);
/**
* Get the number of layouts in the keymap.
*
* @sa xkb_layout_index_t xkb_rule_names xkb_keymap_num_layouts_for_key()
* @memberof xkb_keymap
*/
xkb_layout_index_t
xkb_keymap_num_layouts(struct xkb_keymap *keymap);
/**
* Get the name of a layout by index.
*
* @returns The name. If the index is invalid, or the layout does not have
* a name, returns NULL.
*
* @sa xkb_layout_index_t
* For notes on layout names.
* @memberof xkb_keymap
*/
const char *
xkb_keymap_layout_get_name(struct xkb_keymap *keymap, xkb_layout_index_t idx);
/**
* Get the index of a layout by name.
*
* @returns The index. If no layout exists with this name, returns
* XKB_LAYOUT_INVALID. If more than one layout in the keymap has this name,
* returns the lowest index among them.
*
* @sa xkb_layout_index_t
* For notes on layout names.
* @memberof xkb_keymap
*/
xkb_layout_index_t
xkb_keymap_layout_get_index(struct xkb_keymap *keymap, const char *name);
/**
* Get the number of LEDs in the keymap.
*
* @warning The range [ 0...xkb_keymap_num_leds() ) includes all of the LEDs
* in the keymap, but may also contain inactive LEDs. When iterating over
* this range, you need the handle this case when calling functions such as
* xkb_keymap_led_get_name() or xkb_state_led_index_is_active().
*
* @sa xkb_led_index_t
* @memberof xkb_keymap
*/
xkb_led_index_t
xkb_keymap_num_leds(struct xkb_keymap *keymap);
/**
* Get the name of a LED by index.
*
* @returns The name. If the index is invalid, returns NULL.
*
* @memberof xkb_keymap
*/
const char *
xkb_keymap_led_get_name(struct xkb_keymap *keymap, xkb_led_index_t idx);
/**
* Get the index of a LED by name.
*
* @returns The index. If no LED with this name exists, returns
* XKB_LED_INVALID.
*
* @memberof xkb_keymap
*/
xkb_led_index_t
xkb_keymap_led_get_index(struct xkb_keymap *keymap, const char *name);
/**
* Get the number of layouts for a specific key.
*
* This number can be different from xkb_keymap_num_layouts(), but is always
* smaller. It is the appropriate value to use when iterating over the
* layouts of a key.
*
* @sa xkb_layout_index_t
* @memberof xkb_keymap
*/
xkb_layout_index_t
xkb_keymap_num_layouts_for_key(struct xkb_keymap *keymap, xkb_keycode_t key);
/**
* Get the number of shift levels for a specific key and layout.
*
* If @c layout is out of range for this key (that is, larger or equal to
* the value returned by xkb_keymap_num_layouts_for_key()), it is brought
* back into range in a manner consistent with xkb_state_key_get_layout().
*
* @sa xkb_level_index_t
* @memberof xkb_keymap
*/
xkb_level_index_t
xkb_keymap_num_levels_for_key(struct xkb_keymap *keymap, xkb_keycode_t key,
xkb_layout_index_t layout);
/**
* Retrieves every possible modifier mask that produces the specified
* shift level for a specific key and layout.
*
* This API is useful for inverse key transformation; i.e. finding out
* which modifiers need to be active in order to be able to type the
* keysym(s) corresponding to the specific key code, layout and level.
*
* @warning It returns only up to masks_size modifier masks. If the
* buffer passed is too small, some of the possible modifier combinations
* will not be returned.
*
* @param[in] keymap The keymap.
* @param[in] key The keycode of the key.
* @param[in] layout The layout for which to get modifiers.
* @param[in] level The shift level in the layout for which to get the
* modifiers. This should be smaller than:
* @code xkb_keymap_num_levels_for_key(keymap, key) @endcode
* @param[out] masks_out A buffer in which the requested masks should be
* stored.
* @param[out] masks_size The size of the buffer pointed to by masks_out.
*
* If @c layout is out of range for this key (that is, larger or equal to
* the value returned by xkb_keymap_num_layouts_for_key()), it is brought
* back into range in a manner consistent with xkb_state_key_get_layout().
*
* @returns The number of modifier masks stored in the masks_out array.
* If the key is not in the keymap or if the specified shift level cannot
* be reached it returns 0 and does not modify the masks_out buffer.
*
* @sa xkb_level_index_t
* @sa xkb_mod_mask_t
* @memberof xkb_keymap
* @since 1.0.0
*/
size_t
xkb_keymap_key_get_mods_for_level(struct xkb_keymap *keymap,
xkb_keycode_t key,
xkb_layout_index_t layout,
xkb_level_index_t level,
xkb_mod_mask_t *masks_out,
size_t masks_size);
/**
* Get the keysyms obtained from pressing a key in a given layout and
* shift level.
*
* This function is like xkb_state_key_get_syms(), only the layout and
* shift level are not derived from the keyboard state but are instead
* specified explicitly.
*
* @param[in] keymap The keymap.
* @param[in] key The keycode of the key.
* @param[in] layout The layout for which to get the keysyms.
* @param[in] level The shift level in the layout for which to get the
* keysyms. This should be smaller than:
* @code xkb_keymap_num_levels_for_key(keymap, key) @endcode
* @param[out] syms_out An immutable array of keysyms corresponding to the
* key in the given layout and shift level.
*
* If @c layout is out of range for this key (that is, larger or equal to
* the value returned by xkb_keymap_num_layouts_for_key()), it is brought
* back into range in a manner consistent with xkb_state_key_get_layout().
*
* @returns The number of keysyms in the syms_out array. If no keysyms
* are produced by the key in the given layout and shift level, returns 0
* and sets syms_out to NULL.
*
* @sa xkb_state_key_get_syms()
* @memberof xkb_keymap
*/
int
xkb_keymap_key_get_syms_by_level(struct xkb_keymap *keymap,
xkb_keycode_t key,
xkb_layout_index_t layout,
xkb_level_index_t level,
const xkb_keysym_t **syms_out);
/**
* Determine whether a key should repeat or not.
*
* A keymap may specify different repeat behaviors for different keys.
* Most keys should generally exhibit repeat behavior; for example, holding
* the 'a' key down in a text editor should normally insert a single 'a'
* character every few milliseconds, until the key is released. However,
* there are keys which should not or do not need to be repeated. For
* example, repeating modifier keys such as Left/Right Shift or Caps Lock
* is not generally useful or desired.
*
* @returns 1 if the key should repeat, 0 otherwise.
*
* @memberof xkb_keymap
*/
int
xkb_keymap_key_repeats(struct xkb_keymap *keymap, xkb_keycode_t key);
/** @} */
/**
* @defgroup state Keyboard State
* Creating, destroying and manipulating keyboard state objects.
*
* @{
*/
/**
* Create a new keyboard state object.
*
* @param keymap The keymap which the state will use.
*
* @returns A new keyboard state object, or NULL on failure.
*
* @memberof xkb_state
*/
struct xkb_state *
xkb_state_new(struct xkb_keymap *keymap);
/**
* Take a new reference on a keyboard state object.
*
* @returns The passed in object.
*
* @memberof xkb_state
*/
struct xkb_state *
xkb_state_ref(struct xkb_state *state);
/**
* Release a reference on a keybaord state object, and possibly free it.
*
* @param state The state. If it is NULL, this function does nothing.
*
* @memberof xkb_state
*/
void
xkb_state_unref(struct xkb_state *state);
/**
* Get the keymap which a keyboard state object is using.
*
* @returns The keymap which was passed to xkb_state_new() when creating
* this state object.
*
* This function does not take a new reference on the keymap; you must
* explicitly reference it yourself if you plan to use it beyond the
* lifetime of the state.
*
* @memberof xkb_state
*/
struct xkb_keymap *
xkb_state_get_keymap(struct xkb_state *state);
/** Specifies the direction of the key (press / release). */
enum xkb_key_direction {
XKB_KEY_UP, /**< The key was released. */
XKB_KEY_DOWN /**< The key was pressed. */
};
/**
* Modifier and layout types for state objects. This enum is bitmaskable,
* e.g. (XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED) is valid to
* exclude locked modifiers.
*
* In XKB, the DEPRESSED components are also known as 'base'.
*/
enum xkb_state_component {
/** Depressed modifiers, i.e. a key is physically holding them. */
XKB_STATE_MODS_DEPRESSED = (1 << 0),
/** Latched modifiers, i.e. will be unset after the next non-modifier
* key press. */
XKB_STATE_MODS_LATCHED = (1 << 1),
/** Locked modifiers, i.e. will be unset after the key provoking the
* lock has been pressed again. */
XKB_STATE_MODS_LOCKED = (1 << 2),
/** Effective modifiers, i.e. currently active and affect key
* processing (derived from the other state components).
* Use this unless you explicitly care how the state came about. */
XKB_STATE_MODS_EFFECTIVE = (1 << 3),
/** Depressed layout, i.e. a key is physically holding it. */
XKB_STATE_LAYOUT_DEPRESSED = (1 << 4),
/** Latched layout, i.e. will be unset after the next non-modifier
* key press. */
XKB_STATE_LAYOUT_LATCHED = (1 << 5),
/** Locked layout, i.e. will be unset after the key provoking the lock
* has been pressed again. */
XKB_STATE_LAYOUT_LOCKED = (1 << 6),
/** Effective layout, i.e. currently active and affects key processing
* (derived from the other state components).
* Use this unless you explicitly care how the state came about. */
XKB_STATE_LAYOUT_EFFECTIVE = (1 << 7),
/** LEDs (derived from the other state components). */
XKB_STATE_LEDS = (1 << 8)
};
/**
* Update the keyboard state to reflect a given key being pressed or
* released.
*
* This entry point is intended for programs which track the keyboard state
* explicitly (like an evdev client). If the state is serialized to you by
* a master process (like a Wayland compositor) using functions like
* xkb_state_serialize_mods(), you should use xkb_state_update_mask() instead.
* The two functions should not generally be used together.
*
* A series of calls to this function should be consistent; that is, a call
* with XKB_KEY_DOWN for a key should be matched by an XKB_KEY_UP; if a key
* is pressed twice, it should be released twice; etc. Otherwise (e.g. due
* to missed input events), situations like "stuck modifiers" may occur.
*
* This function is often used in conjunction with the function
* xkb_state_key_get_syms() (or xkb_state_key_get_one_sym()), for example,
* when handling a key event. In this case, you should prefer to get the
* keysyms *before* updating the key, such that the keysyms reported for
* the key event are not affected by the event itself. This is the
* conventional behavior.
*
* @returns A mask of state components that have changed as a result of
* the update. If nothing in the state has changed, returns 0.
*
* @memberof xkb_state
*
* @sa xkb_state_update_mask()
*/
enum xkb_state_component
xkb_state_update_key(struct xkb_state *state, xkb_keycode_t key,
enum xkb_key_direction direction);
/**
* Update a keyboard state from a set of explicit masks.
*
* This entry point is intended for window systems and the like, where a
* master process holds an xkb_state, then serializes it over a wire
* protocol, and clients then use the serialization to feed in to their own
* xkb_state.
*
* All parameters must always be passed, or the resulting state may be
* incoherent.
*
* The serialization is lossy and will not survive round trips; it must only
* be used to feed slave state objects, and must not be used to update the
* master state.
*
* If you do not fit the description above, you should use
* xkb_state_update_key() instead. The two functions should not generally be
* used together.
*
* @returns A mask of state components that have changed as a result of
* the update. If nothing in the state has changed, returns 0.
*
* @memberof xkb_state
*
* @sa xkb_state_component
* @sa xkb_state_update_key
*/
enum xkb_state_component
xkb_state_update_mask(struct xkb_state *state,
xkb_mod_mask_t depressed_mods,
xkb_mod_mask_t latched_mods,
xkb_mod_mask_t locked_mods,
xkb_layout_index_t depressed_layout,
xkb_layout_index_t latched_layout,
xkb_layout_index_t locked_layout);
/**
* Get the keysyms obtained from pressing a particular key in a given
* keyboard state.
*
* Get the keysyms for a key according to the current active layout,
* modifiers and shift level for the key, as determined by a keyboard
* state.
*
* @param[in] state The keyboard state object.
* @param[in] key The keycode of the key.
* @param[out] syms_out An immutable array of keysyms corresponding the
* key in the given keyboard state.
*
* As an extension to XKB, this function can return more than one keysym.
* If you do not want to handle this case, you can use
* xkb_state_key_get_one_sym() for a simpler interface.
*
* This function does not perform any @ref keysym-transformations.
* (This might change).
*
* @returns The number of keysyms in the syms_out array. If no keysyms
* are produced by the key in the given keyboard state, returns 0 and sets
* syms_out to NULL.
*
* @memberof xkb_state
*/
int
xkb_state_key_get_syms(struct xkb_state *state, xkb_keycode_t key,
const xkb_keysym_t **syms_out);
/**
* Get the Unicode/UTF-8 string obtained from pressing a particular key
* in a given keyboard state.
*
* @param[in] state The keyboard state object.
* @param[in] key The keycode of the key.
* @param[out] buffer A buffer to write the string into.
* @param[in] size Size of the buffer.
*
* @warning If the buffer passed is too small, the string is truncated
* (though still NUL-terminated).
*
* @returns The number of bytes required for the string, excluding the
* NUL byte. If there is nothing to write, returns 0.
*
* You may check if truncation has occurred by comparing the return value
* with the size of @p buffer, similarly to the snprintf(3) function.
* You may safely pass NULL and 0 to @p buffer and @p size to find the
* required size (without the NUL-byte).
*
* This function performs Capitalization and Control @ref
* keysym-transformations.
*
* @memberof xkb_state
* @since 0.4.1
*/
int
xkb_state_key_get_utf8(struct xkb_state *state, xkb_keycode_t key,
char *buffer, size_t size);
/**
* Get the Unicode/UTF-32 codepoint obtained from pressing a particular
* key in a a given keyboard state.
*
* @returns The UTF-32 representation for the key, if it consists of only
* a single codepoint. Otherwise, returns 0.
*
* This function performs Capitalization and Control @ref
* keysym-transformations.
*
* @memberof xkb_state
* @since 0.4.1
*/
uint32_t
xkb_state_key_get_utf32(struct xkb_state *state, xkb_keycode_t key);
/**
* Get the single keysym obtained from pressing a particular key in a
* given keyboard state.
*
* This function is similar to xkb_state_key_get_syms(), but intended
* for users which cannot or do not want to handle the case where
* multiple keysyms are returned (in which case this function is
* preferred).
*
* @returns The keysym. If the key does not have exactly one keysym,
* returns XKB_KEY_NoSymbol
*
* This function performs Capitalization @ref keysym-transformations.
*
* @sa xkb_state_key_get_syms()
* @memberof xkb_state
*/
xkb_keysym_t
xkb_state_key_get_one_sym(struct xkb_state *state, xkb_keycode_t key);
/**
* Get the effective layout index for a key in a given keyboard state.
*
* @returns The layout index for the key in the given keyboard state. If
* the given keycode is invalid, or if the key is not included in any
* layout at all, returns XKB_LAYOUT_INVALID.
*
* @invariant If the returned layout is valid, the following always holds:
* @code
* xkb_state_key_get_layout(state, key) < xkb_keymap_num_layouts_for_key(keymap, key)
* @endcode
*
* @memberof xkb_state
*/
xkb_layout_index_t
xkb_state_key_get_layout(struct xkb_state *state, xkb_keycode_t key);
/**
* Get the effective shift level for a key in a given keyboard state and
* layout.
*
* @param state The keyboard state.
* @param key The keycode of the key.
* @param layout The layout for which to get the shift level. This must be
* smaller than:
* @code xkb_keymap_num_layouts_for_key(keymap, key) @endcode
* usually it would be:
* @code xkb_state_key_get_layout(state, key) @endcode
*
* @return The shift level index. If the key or layout are invalid,
* returns XKB_LEVEL_INVALID.
*
* @invariant If the returned level is valid, the following always holds:
* @code
* xkb_state_key_get_level(state, key, layout) < xkb_keymap_num_levels_for_key(keymap, key, layout)
* @endcode
*
* @memberof xkb_state
*/
xkb_level_index_t
xkb_state_key_get_level(struct xkb_state *state, xkb_keycode_t key,
xkb_layout_index_t layout);
/**
* Match flags for xkb_state_mod_indices_are_active() and
* xkb_state_mod_names_are_active(), specifying the conditions for a
* successful match. XKB_STATE_MATCH_NON_EXCLUSIVE is bitmaskable with
* the other modes.
*/
enum xkb_state_match {
/** Returns true if any of the modifiers are active. */
XKB_STATE_MATCH_ANY = (1 << 0),
/** Returns true if all of the modifiers are active. */
XKB_STATE_MATCH_ALL = (1 << 1),
/** Makes matching non-exclusive, i.e. will not return false if a
* modifier not specified in the arguments is active. */
XKB_STATE_MATCH_NON_EXCLUSIVE = (1 << 16)
};
/**
* The counterpart to xkb_state_update_mask for modifiers, to be used on
* the server side of serialization.
*
* @param state The keyboard state.
* @param components A mask of the modifier state components to serialize.
* State components other than XKB_STATE_MODS_* are ignored.
* If XKB_STATE_MODS_EFFECTIVE is included, all other state components are
* ignored.
*
* @returns A xkb_mod_mask_t representing the given components of the
* modifier state.
*
* This function should not be used in regular clients; please use the
* xkb_state_mod_*_is_active API instead.
*
* @memberof xkb_state
*/
xkb_mod_mask_t
xkb_state_serialize_mods(struct xkb_state *state,
enum xkb_state_component components);
/**
* The counterpart to xkb_state_update_mask for layouts, to be used on
* the server side of serialization.
*
* @param state The keyboard state.
* @param components A mask of the layout state components to serialize.
* State components other than XKB_STATE_LAYOUT_* are ignored.
* If XKB_STATE_LAYOUT_EFFECTIVE is included, all other state components are
* ignored.
*
* @returns A layout index representing the given components of the
* layout state.
*
* This function should not be used in regular clients; please use the
* xkb_state_layout_*_is_active API instead.
*
* @memberof xkb_state
*/
xkb_layout_index_t
xkb_state_serialize_layout(struct xkb_state *state,
enum xkb_state_component components);
/**
* Test whether a modifier is active in a given keyboard state by name.
*
* @returns 1 if the modifier is active, 0 if it is not. If the modifier
* name does not exist in the keymap, returns -1.
*
* @memberof xkb_state
*/
int
xkb_state_mod_name_is_active(struct xkb_state *state, const char *name,
enum xkb_state_component type);
/**
* Test whether a set of modifiers are active in a given keyboard state by
* name.
*
* @param state The keyboard state.
* @param type The component of the state against which to match the
* given modifiers.
* @param match The manner by which to match the state against the
* given modifiers.
* @param ... The set of of modifier names to test, terminated by a NULL
* argument (sentinel).
*
* @returns 1 if the modifiers are active, 0 if they are not. If any of
* the modifier names do not exist in the keymap, returns -1.
*
* @memberof xkb_state
*/
int
xkb_state_mod_names_are_active(struct xkb_state *state,
enum xkb_state_component type,
enum xkb_state_match match,
...);
/**
* Test whether a modifier is active in a given keyboard state by index.
*
* @returns 1 if the modifier is active, 0 if it is not. If the modifier
* index is invalid in the keymap, returns -1.
*
* @memberof xkb_state
*/
int
xkb_state_mod_index_is_active(struct xkb_state *state, xkb_mod_index_t idx,
enum xkb_state_component type);
/**
* Test whether a set of modifiers are active in a given keyboard state by
* index.
*
* @param state The keyboard state.
* @param type The component of the state against which to match the
* given modifiers.
* @param match The manner by which to match the state against the
* given modifiers.
* @param ... The set of of modifier indices to test, terminated by a
* XKB_MOD_INVALID argument (sentinel).
*
* @returns 1 if the modifiers are active, 0 if they are not. If any of
* the modifier indices are invalid in the keymap, returns -1.
*
* @memberof xkb_state
*/
int
xkb_state_mod_indices_are_active(struct xkb_state *state,
enum xkb_state_component type,
enum xkb_state_match match,
...);
/**
* @page consumed-modifiers Consumed Modifiers
* @parblock
*
* Some functions, like xkb_state_key_get_syms(), look at the state of
* the modifiers in the keymap and derive from it the correct shift level
* to use for the key. For example, in a US layout, pressing the key
* labeled \<A\> while the Shift modifier is active, generates the keysym
* 'A'. In this case, the Shift modifier is said to be "consumed".
* However, the Num Lock modifier does not affect this translation at all,
* even if it is active, so it is not consumed by this translation.
*
* It may be desirable for some application to not reuse consumed modifiers
* for further processing, e.g. for hotkeys or keyboard shortcuts. To
* understand why, consider some requirements from a standard shortcut
* mechanism, and how they are implemented:
*
* 1. The shortcut's modifiers must match exactly to the state. For
* example, it is possible to bind separate actions to \<Alt\>\<Tab\>
* and to \<Alt\>\<Shift\>\<Tab\>. Further, if only \<Alt\>\<Tab\> is
* bound to an action, pressing \<Alt\>\<Shift\>\<Tab\> should not
* trigger the shortcut.
* Effectively, this means that the modifiers are compared using the
* equality operator (==).
*
* 2. Only relevant modifiers are considered for the matching. For example,
* Caps Lock and Num Lock should not generally affect the matching, e.g.
* when matching \<Alt\>\<Tab\> against the state, it does not matter
* whether Num Lock is active or not. These relevant, or "significant",
* modifiers usually include Alt, Control, Shift, Super and similar.
* Effectively, this means that non-significant modifiers are masked out,
* before doing the comparison as described above.
*
* 3. The matching must be independent of the layout/keymap. For example,
* the \<Plus\> (+) symbol is found on the first level on some layouts,
* but requires holding Shift on others. If you simply bind the action
* to the \<Plus\> keysym, it would work for the unshifted kind, but
* not for the others, because the match against Shift would fail. If
* you bind the action to \<Shift\>\<Plus\>, only the shifted kind would
* work. So what is needed is to recognize that Shift is used up in the
* translation of the keysym itself, and therefore should not be included
* in the matching.
* Effectively, this means that consumed modifiers (Shift in this example)
* are masked out as well, before doing the comparison.
*
* In summary, this is approximately how the matching would be performed:
* @code
* (keysym == shortcut_keysym) &&
* ((state_mods & ~consumed_mods & significant_mods) == shortcut_mods)
* @endcode
*
* @c state_mods are the modifiers reported by
* xkb_state_mod_index_is_active() and similar functions.
* @c consumed_mods are the modifiers reported by
* xkb_state_mod_index_is_consumed() and similar functions.
* @c significant_mods are decided upon by the application/toolkit/user;
* it is up to them to decide whether these are configurable or hard-coded.
*
* @endparblock
*/
/**
* Consumed modifiers mode.
*
* There are several possible methods for deciding which modifiers are
* consumed and which are not, each applicable for different systems or
* situations. The mode selects the method to use.
*
* Keep in mind that in all methods, the keymap may decide to "preserve"
* a modifier, meaning it is not reported as consumed even if it would
* have otherwise.
*/
enum xkb_consumed_mode {
/**
* This is the mode defined in the XKB specification and used by libX11.
*
* A modifier is consumed if and only if it *may affect* key translation.
*
* For example, if `Control+Alt+<Backspace>` produces some assigned keysym,
* then when pressing just `<Backspace>`, `Control` and `Alt` are consumed,
* even though they are not active, since if they *were* active they would
* have affected key translation.
*/
XKB_CONSUMED_MODE_XKB,
/**
* This is the mode used by the GTK+ toolkit.
*
* The mode consists of the following two independent heuristics:
*
* - The currently active set of modifiers, excluding modifiers which do
* not affect the key (as described for @ref XKB_CONSUMED_MODE_XKB), are
* considered consumed, if the keysyms produced when all of them are
* active are different from the keysyms produced when no modifiers are
* active.
*
* - A single modifier is considered consumed if the keysyms produced for
* the key when it is the only active modifier are different from the
* keysyms produced when no modifiers are active.
*/
XKB_CONSUMED_MODE_GTK
};
/**
* Get the mask of modifiers consumed by translating a given key.
*
* @param state The keyboard state.
* @param key The keycode of the key.
* @param mode The consumed modifiers mode to use; see enum description.
*
* @returns a mask of the consumed modifiers.
*
* @memberof xkb_state
* @since 0.7.0
*/
xkb_mod_mask_t
xkb_state_key_get_consumed_mods2(struct xkb_state *state, xkb_keycode_t key,
enum xkb_consumed_mode mode);
/**
* Same as xkb_state_key_get_consumed_mods2() with mode XKB_CONSUMED_MODE_XKB.
*
* @memberof xkb_state
* @since 0.4.1
*/
xkb_mod_mask_t
xkb_state_key_get_consumed_mods(struct xkb_state *state, xkb_keycode_t key);
/**
* Test whether a modifier is consumed by keyboard state translation for
* a key.
*
* @param state The keyboard state.
* @param key The keycode of the key.
* @param idx The index of the modifier to check.
* @param mode The consumed modifiers mode to use; see enum description.
*
* @returns 1 if the modifier is consumed, 0 if it is not. If the modifier
* index is not valid in the keymap, returns -1.
*
* @sa xkb_state_mod_mask_remove_consumed()
* @sa xkb_state_key_get_consumed_mods()
* @memberof xkb_state
* @since 0.7.0
*/
int
xkb_state_mod_index_is_consumed2(struct xkb_state *state,
xkb_keycode_t key,
xkb_mod_index_t idx,
enum xkb_consumed_mode mode);
/**
* Same as xkb_state_mod_index_is_consumed2() with mode XKB_CONSUMED_MOD_XKB.
*
* @memberof xkb_state
* @since 0.4.1
*/
int
xkb_state_mod_index_is_consumed(struct xkb_state *state, xkb_keycode_t key,
xkb_mod_index_t idx);
/**
* Remove consumed modifiers from a modifier mask for a key.
*
* @deprecated Use xkb_state_key_get_consumed_mods2() instead.
*
* Takes the given modifier mask, and removes all modifiers which are
* consumed for that particular key (as in xkb_state_mod_index_is_consumed()).
*
* @sa xkb_state_mod_index_is_consumed()
* @memberof xkb_state
*/
xkb_mod_mask_t
xkb_state_mod_mask_remove_consumed(struct xkb_state *state, xkb_keycode_t key,
xkb_mod_mask_t mask);
/**
* Test whether a layout is active in a given keyboard state by name.
*
* @returns 1 if the layout is active, 0 if it is not. If no layout with
* this name exists in the keymap, return -1.
*
* If multiple layouts in the keymap have this name, the one with the lowest
* index is tested.
*
* @sa xkb_layout_index_t
* @memberof xkb_state
*/
int
xkb_state_layout_name_is_active(struct xkb_state *state, const char *name,
enum xkb_state_component type);
/**
* Test whether a layout is active in a given keyboard state by index.
*
* @returns 1 if the layout is active, 0 if it is not. If the layout index
* is not valid in the keymap, returns -1.
*
* @sa xkb_layout_index_t
* @memberof xkb_state
*/
int
xkb_state_layout_index_is_active(struct xkb_state *state,
xkb_layout_index_t idx,
enum xkb_state_component type);
/**
* Test whether a LED is active in a given keyboard state by name.
*
* @returns 1 if the LED is active, 0 if it not. If no LED with this name
* exists in the keymap, returns -1.
*
* @sa xkb_led_index_t
* @memberof xkb_state
*/
int
xkb_state_led_name_is_active(struct xkb_state *state, const char *name);
/**
* Test whether a LED is active in a given keyboard state by index.
*
* @returns 1 if the LED is active, 0 if it not. If the LED index is not
* valid in the keymap, returns -1.
*
* @sa xkb_led_index_t
* @memberof xkb_state
*/
int
xkb_state_led_index_is_active(struct xkb_state *state, xkb_led_index_t idx);
/** @} */
/* Leave this include last, so it can pick up our types, etc. */
#include <xkbcommon/xkbcommon-compat.h>
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* _XKBCOMMON_H_ */