245 lines
9.0 KiB
C
245 lines
9.0 KiB
C
/*
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* Copyright © 2013 Ran Benita
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _XKBCOMMON_X11_H
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#define _XKBCOMMON_X11_H
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#include <xcb/xcb.h>
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#include <xkbcommon/xkbcommon.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @file
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* libxkbcommon-x11 API - Additional X11 support for xkbcommon.
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*/
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/**
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* @defgroup x11 X11 support
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* Additional X11 support for xkbcommon.
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* @since 0.4.0
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*
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* @{
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*/
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/**
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* @page x11-overview Overview
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* @parblock
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*
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* The xkbcommon-x11 module provides a means for creating an xkb_keymap
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* corresponding to the currently active keymap on the X server. To do
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* so, it queries the XKB X11 extension using the xcb-xkb library. It
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* can be used as a replacement for Xlib's keyboard handling.
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*
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* Following is an example workflow using xkbcommon-x11. A complete
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* example may be found in the tools/interactive-x11.c file in the
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* xkbcommon source repository. On startup:
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*
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* 1. Connect to the X server using xcb_connect().
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* 2. Setup the XKB X11 extension. You can do this either by using the
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* xcb_xkb_use_extension() request directly, or by using the
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* xkb_x11_setup_xkb_extension() helper function.
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*
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* The XKB extension supports using separate keymaps and states for
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* different keyboard devices. The devices are identified by an integer
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* device ID and are managed by another X11 extension, XInput. The
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* original X11 protocol only had one keyboard device, called the "core
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* keyboard", which is still supported as a "virtual device".
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*
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* 3. We will use the core keyboard as an example. To get its device ID,
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* use either the xcb_xkb_get_device_info() request directly, or the
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* xkb_x11_get_core_keyboard_device_id() helper function.
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* 4. Create an initial xkb_keymap for this device, using the
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* xkb_x11_keymap_new_from_device() function.
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* 5. Create an initial xkb_state for this device, using the
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* xkb_x11_state_new_from_device() function.
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*
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* @note At this point, you may consider setting various XKB controls and
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* XKB per-client flags. For example, enabling detectable autorepeat: \n
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* https://www.x.org/releases/current/doc/kbproto/xkbproto.html#Detectable_Autorepeat
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*
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* Next, you need to react to state changes (e.g. a modifier was pressed,
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* the layout was changed) and to keymap changes (e.g. a tool like xkbcomp,
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* setxkbmap or xmodmap was used):
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*
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* 6. Select to listen to at least the following XKB events:
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* NewKeyboardNotify, MapNotify, StateNotify; using the
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* xcb_xkb_select_events_aux() request.
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* 7. When NewKeyboardNotify or MapNotify are received, recreate the
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* xkb_keymap and xkb_state as described above.
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* 8. When StateNotify is received, update the xkb_state accordingly
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* using the xkb_state_update_mask() function.
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*
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* @note It is also possible to use the KeyPress/KeyRelease @p state
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* field to find the effective modifier and layout state, instead of
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* using XkbStateNotify: \n
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* https://www.x.org/releases/current/doc/kbproto/xkbproto.html#Computing_A_State_Field_from_an_XKB_State
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* \n However, XkbStateNotify is more accurate.
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*
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* @note There is no need to call xkb_state_update_key(); the state is
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* already synchronized.
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*
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* Finally, when a key event is received, you can use ordinary xkbcommon
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* functions, like xkb_state_key_get_one_sym() and xkb_state_key_get_utf8(),
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* as you normally would.
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*
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* @endparblock
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*/
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/**
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* The minimal compatible major version of the XKB X11 extension which
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* this library can use.
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*/
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#define XKB_X11_MIN_MAJOR_XKB_VERSION 1
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/**
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* The minimal compatible minor version of the XKB X11 extension which
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* this library can use (for the minimal major version).
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*/
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#define XKB_X11_MIN_MINOR_XKB_VERSION 0
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/** Flags for the xkb_x11_setup_xkb_extension() function. */
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enum xkb_x11_setup_xkb_extension_flags {
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/** Do not apply any flags. */
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XKB_X11_SETUP_XKB_EXTENSION_NO_FLAGS = 0
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};
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/**
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* Setup the XKB X11 extension for this X client.
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*
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* The xkbcommon-x11 library uses various XKB requests. Before doing so,
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* an X client must notify the server that it will be using the extension.
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* This function (or an XCB equivalent) must be called before any other
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* function in this library is used.
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*
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* Some X servers may not support or disable the XKB extension. If you
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* want to support such servers, you need to use a different fallback.
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*
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* You may call this function several times; it is idempotent.
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*
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* @param connection
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* An XCB connection to the X server.
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* @param major_xkb_version
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* See @p minor_xkb_version.
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* @param minor_xkb_version
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* The XKB extension version to request. To operate correctly, you
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* must have (major_xkb_version, minor_xkb_version) >=
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* (XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION),
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* though this is not enforced.
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* @param flags
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* Optional flags, or 0.
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* @param[out] major_xkb_version_out
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* See @p minor_xkb_version_out.
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* @param[out] minor_xkb_version_out
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* Backfilled with the compatible XKB extension version numbers picked
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* by the server. Can be NULL.
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* @param[out] base_event_out
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* Backfilled with the XKB base (also known as first) event code, needed
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* to distinguish XKB events. Can be NULL.
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* @param[out] base_error_out
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* Backfilled with the XKB base (also known as first) error code, needed
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* to distinguish XKB errors. Can be NULL.
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*
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* @returns 1 on success, or 0 on failure.
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*/
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int
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xkb_x11_setup_xkb_extension(xcb_connection_t *connection,
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uint16_t major_xkb_version,
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uint16_t minor_xkb_version,
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enum xkb_x11_setup_xkb_extension_flags flags,
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uint16_t *major_xkb_version_out,
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uint16_t *minor_xkb_version_out,
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uint8_t *base_event_out,
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uint8_t *base_error_out);
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/**
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* Get the keyboard device ID of the core X11 keyboard.
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*
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* @param connection An XCB connection to the X server.
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*
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* @returns A device ID which may be used with other xkb_x11_* functions,
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* or -1 on failure.
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*/
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int32_t
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xkb_x11_get_core_keyboard_device_id(xcb_connection_t *connection);
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/**
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* Create a keymap from an X11 keyboard device.
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*
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* This function queries the X server with various requests, fetches the
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* details of the active keymap on a keyboard device, and creates an
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* xkb_keymap from these details.
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*
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* @param context
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* The context in which to create the keymap.
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* @param connection
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* An XCB connection to the X server.
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* @param device_id
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* An XInput device ID (in the range 0-127) with input class KEY.
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* Passing values outside of this range is an error (the XKB protocol
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* predates the XInput2 protocol, which first allowed IDs > 127).
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* @param flags
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* Optional flags for the keymap, or 0.
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*
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* @returns A keymap retrieved from the X server, or NULL on failure.
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*
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* @memberof xkb_keymap
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*/
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struct xkb_keymap *
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xkb_x11_keymap_new_from_device(struct xkb_context *context,
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xcb_connection_t *connection,
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int32_t device_id,
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enum xkb_keymap_compile_flags flags);
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/**
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* Create a new keyboard state object from an X11 keyboard device.
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*
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* This function is the same as xkb_state_new(), only pre-initialized
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* with the state of the device at the time this function is called.
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*
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* @param keymap
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* The keymap for which to create the state.
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* @param connection
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* An XCB connection to the X server.
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* @param device_id
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* An XInput 1 device ID (in the range 0-255) with input class KEY.
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* Passing values outside of this range is an error.
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*
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* @returns A new keyboard state object, or NULL on failure.
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*
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* @memberof xkb_state
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*/
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struct xkb_state *
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xkb_x11_state_new_from_device(struct xkb_keymap *keymap,
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xcb_connection_t *connection,
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int32_t device_id);
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/** @} */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* _XKBCOMMON_X11_H */
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