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ndg/indev/xkb.c

218 lines
5.8 KiB
C

/**
* @file xkb.c
*
*/
/*********************
* INCLUDES
*********************/
#include "xkb.h"
#if USE_XKB
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xkbcommon/xkbcommon.h>
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
/**********************
* STATIC VARIABLES
**********************/
static struct xkb_context *context = NULL;
static xkb_drv_state_t default_state = { .keymap = NULL, .state = NULL };
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Initialise the XKB system using the default driver state. Use this function if you only want
* to connect a single device.
* @return true if the initialisation was successful
*/
bool xkb_init(void) {
return xkb_init_state(&default_state);
}
/**
* Initialise the XKB system using a specific driver state. Use this function if you want to
* connect multiple devices.
* @param state XKB driver state to use
* @return true if the initialisation was successful
*/
bool xkb_init_state(xkb_drv_state_t *state) {
if (!context) {
context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
if (!context) {
perror("could not create new XKB context");
return false;
}
}
#ifdef XKB_KEY_MAP
struct xkb_rule_names names = XKB_KEY_MAP;
return xkb_set_keymap_state(state, names);
#else
return false; /* Keymap needs to be set manually using xkb_set_keymap_state to complete initialisation */
#endif
}
/**
* Set a new keymap to be used for processing future key events using the default driver state. Use
* this function if you only want to connect a single device.
* @param names XKB rule names structure (use NULL components for default values)
* @return true if creating the keymap and associated state succeeded
*/
bool xkb_set_keymap(struct xkb_rule_names names) {
return xkb_set_keymap_state(&default_state, names);
}
/**
* Set a new keymap to be used for processing future key events using a specific driver state. Use
* this function if you want to connect multiple devices.
* @param state XKB driver state to use
* @param names XKB rule names structure (use NULL components for default values)
* @return true if creating the keymap and associated state succeeded
*/
bool xkb_set_keymap_state(xkb_drv_state_t *state, struct xkb_rule_names names) {
if (state->keymap) {
xkb_keymap_unref(state->keymap);
state->keymap = NULL;
}
state->keymap = xkb_keymap_new_from_names(context, &names, XKB_KEYMAP_COMPILE_NO_FLAGS);
if (!state->keymap) {
perror("could not create XKB keymap");
return false;
}
state->keymap = xkb_keymap_ref(state->keymap);
if (!state->keymap) {
perror("could not reference XKB keymap");
return false;
}
if (state->state) {
xkb_state_unref(state->state);
state->state = NULL;
}
state->state = xkb_state_new(state->keymap);
if (!state->state) {
perror("could not create XKB state");
return false;
}
state->state = xkb_state_ref(state->state);
if (!state->state) {
perror("could not reference XKB state");
return false;
}
return true;
}
/**
* Process an evdev scancode using the default driver state. Use this function if you only want to
* connect a single device.
* @param scancode evdev scancode to process
* @param down true if the key was pressed, false if it was releases
* @return the (first) UTF-8 character produced by the event or 0 if no output was produced
*/
uint32_t xkb_process_key(uint32_t scancode, bool down) {
return xkb_process_key_state(&default_state, scancode, down);
}
/**
* Process an evdev scancode using a specific driver state. Use this function if you want to connect
* multiple devices.
* @param state XKB driver state to use
* @param scancode evdev scancode to process
* @param down true if the key was pressed, false if it was releases
* @return the (first) UTF-8 character produced by the event or 0 if no output was produced
*/
uint32_t xkb_process_key_state(xkb_drv_state_t *state, uint32_t scancode, bool down) {
/* Offset the evdev scancode by 8, see https://xkbcommon.org/doc/current/xkbcommon_8h.html#ac29aee92124c08d1953910ab28ee1997 */
xkb_keycode_t keycode = scancode + 8;
uint32_t result = 0;
switch (xkb_state_key_get_one_sym(state->state, keycode)) {
case XKB_KEY_BackSpace:
result = LV_KEY_BACKSPACE;
break;
case XKB_KEY_Return:
case XKB_KEY_KP_Enter:
result = LV_KEY_ENTER;
break;
case XKB_KEY_Prior:
case XKB_KEY_KP_Prior:
result = LV_KEY_PREV;
break;
case XKB_KEY_Next:
case XKB_KEY_KP_Next:
result = LV_KEY_NEXT;
break;
case XKB_KEY_Up:
case XKB_KEY_KP_Up:
result = LV_KEY_UP;
break;
case XKB_KEY_Left:
case XKB_KEY_KP_Left:
result = LV_KEY_LEFT;
break;
case XKB_KEY_Right:
case XKB_KEY_KP_Right:
result = LV_KEY_RIGHT;
break;
case XKB_KEY_Down:
case XKB_KEY_KP_Down:
result = LV_KEY_DOWN;
break;
case XKB_KEY_Tab:
case XKB_KEY_KP_Tab:
result = LV_KEY_NEXT;
break;
case XKB_KEY_ISO_Left_Tab: /* Sent on SHIFT + TAB */
result = LV_KEY_PREV;
break;
default:
break;
}
if (result == 0) {
char buffer[4] = { 0, 0, 0, 0 };
int size = xkb_state_key_get_utf8(state->state, keycode, NULL, 0) + 1;
if (size > 1) {
xkb_state_key_get_utf8(state->state, keycode, buffer, size);
memcpy(&result, buffer, 4);
}
}
xkb_state_update_key(state->state, keycode, down ? XKB_KEY_DOWN : XKB_KEY_UP);
return result;
}
/**********************
* STATIC FUNCTIONS
**********************/
#endif /* USE_XKB */