wlroots/rootston/keyboard.c

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#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
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#include <unistd.h>
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#include <wayland-server.h>
#include <wlr/types/wlr_input_device.h>
#include <wlr/types/wlr_pointer.h>
#include <wlr/backend/multi.h>
#include <wlr/backend/session.h>
#include <wlr/util/log.h>
#include <xkbcommon/xkbcommon.h>
#include "rootston/input.h"
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#include "rootston/seat.h"
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#include "rootston/keyboard.h"
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static ssize_t pressed_keysyms_index(xkb_keysym_t *pressed_keysyms,
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xkb_keysym_t keysym) {
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for (size_t i = 0; i < ROOTS_KEYBOARD_PRESSED_KEYSYMS_CAP; ++i) {
if (pressed_keysyms[i] == keysym) {
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return i;
}
}
return -1;
}
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static void pressed_keysyms_add(xkb_keysym_t *pressed_keysyms,
xkb_keysym_t keysym) {
ssize_t i = pressed_keysyms_index(pressed_keysyms, keysym);
if (i < 0) {
i = pressed_keysyms_index(pressed_keysyms, XKB_KEY_NoSymbol);
if (i >= 0) {
pressed_keysyms[i] = keysym;
}
}
}
static void pressed_keysyms_remove(xkb_keysym_t *pressed_keysyms,
xkb_keysym_t keysym) {
ssize_t i = pressed_keysyms_index(pressed_keysyms, keysym);
if (i >= 0) {
pressed_keysyms[i] = XKB_KEY_NoSymbol;
}
}
static const char *exec_prefix = "exec ";
static void keyboard_binding_execute(struct roots_keyboard *keyboard,
const char *command) {
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struct roots_server *server = keyboard->input->server;
if (strcmp(command, "exit") == 0) {
wl_display_terminate(server->wl_display);
} else if (strcmp(command, "close") == 0) {
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if (server->desktop->views->length > 0) {
struct roots_view *view =
server->desktop->views->items[server->desktop->views->length-1];
view_close(view);
}
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} else if (strcmp(command, "next_window") == 0) {
if (server->desktop->views->length > 0) {
struct roots_view *view = server->desktop->views->items[0];
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roots_seat_focus_view(keyboard->seat, view);
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}
} else if (strncmp(exec_prefix, command, strlen(exec_prefix)) == 0) {
const char *shell_cmd = command + strlen(exec_prefix);
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pid_t pid = fork();
if (pid < 0) {
wlr_log(L_ERROR, "cannot execute binding command: fork() failed");
return;
} else if (pid == 0) {
execl("/bin/sh", "/bin/sh", "-c", shell_cmd, (void *)NULL);
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}
} else {
wlr_log(L_ERROR, "unknown binding command: %s", command);
}
}
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/**
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* Execute a built-in, hardcoded compositor action when a keysym is pressed.
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*
* Returns true if the keysym was handled by a binding and false if the event
* should be propagated to clients.
*/
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static bool keyboard_press_keysym(struct roots_keyboard *keyboard,
xkb_keysym_t keysym) {
if (keysym >= XKB_KEY_XF86Switch_VT_1 &&
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keysym <= XKB_KEY_XF86Switch_VT_12) {
struct roots_server *server = keyboard->input->server;
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if (wlr_backend_is_multi(server->backend)) {
struct wlr_session *session =
wlr_multi_get_session(server->backend);
if (session) {
unsigned vt = keysym - XKB_KEY_XF86Switch_VT_1 + 1;
wlr_session_change_vt(session, vt);
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}
}
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return true;
}
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if (keysym == XKB_KEY_Escape) {
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wlr_seat_pointer_end_grab(keyboard->seat->seat);
wlr_seat_keyboard_end_grab(keyboard->seat->seat);
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}
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return false;
}
/**
* Press or release keysyms.
*
* Returns true if the keysym was handled by a binding and false if the event
* should be propagated to clients.
*/
static bool keyboard_handle_keysyms(struct roots_keyboard *keyboard,
xkb_keysym_t *pressed_keysyms, uint32_t modifiers,
const xkb_keysym_t *keysyms, size_t keysyms_len,
enum wlr_key_state state) {
bool handled = false;
for (size_t i = 0; i < keysyms_len; ++i) {
if (state == WLR_KEY_PRESSED) {
pressed_keysyms_add(pressed_keysyms, keysyms[i]);
handled |= keyboard_press_keysym(keyboard, keysyms[i]);
} else { // WLR_KEY_RELEASED
pressed_keysyms_remove(pressed_keysyms, keysyms[i]);
}
}
if (handled) {
return true;
}
if (state != WLR_KEY_PRESSED) {
return false;
}
struct wl_list *bindings = &keyboard->input->server->config->bindings;
struct roots_binding_config *bc;
wl_list_for_each(bc, bindings, link) {
if (modifiers ^ bc->modifiers) {
continue;
}
bool ok = true;
for (size_t i = 0; i < bc->keysyms_len; i++) {
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ssize_t j = pressed_keysyms_index(pressed_keysyms, bc->keysyms[i]);
if (j < 0) {
ok = false;
break;
}
}
if (ok) {
keyboard_binding_execute(keyboard, bc->command);
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return true;
}
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}
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return false;
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}
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/*
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* Get keysyms and modifiers from the keyboard as xkb sees them.
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*
* This uses the xkb keysyms translation based on pressed modifiers and clears
* the consumed modifiers from the list of modifiers passed to keybind
* detection.
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*
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* On US layout, this will trigger: Alt + @
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*/
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static size_t keyboard_keysyms_translated(struct roots_keyboard *keyboard,
xkb_keycode_t keycode, const xkb_keysym_t **keysyms,
uint32_t *modifiers) {
*modifiers = wlr_keyboard_get_modifiers(keyboard->device->keyboard);
xkb_mod_mask_t consumed = xkb_state_key_get_consumed_mods2(
keyboard->device->keyboard->xkb_state, keycode, XKB_CONSUMED_MODE_XKB);
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*modifiers = *modifiers & ~consumed;
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return xkb_state_key_get_syms(keyboard->device->keyboard->xkb_state,
keycode, keysyms);
}
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/*
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* Get keysyms and modifiers from the keyboard as if modifiers didn't change
* keysyms.
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*
* This avoids the xkb keysym translation based on modifiers considered pressed
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* in the state.
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*
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* This will trigger the keybind: Alt + Shift + 2
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*/
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static size_t keyboard_keysyms_raw(struct roots_keyboard *keyboard,
xkb_keycode_t keycode, const xkb_keysym_t **keysyms,
uint32_t *modifiers) {
*modifiers = wlr_keyboard_get_modifiers(keyboard->device->keyboard);
xkb_layout_index_t layout_index = xkb_state_key_get_layout(
keyboard->device->keyboard->xkb_state, keycode);
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return xkb_keymap_key_get_syms_by_level(keyboard->device->keyboard->keymap,
keycode, layout_index, 0, keysyms);
}
void roots_keyboard_handle_key(struct roots_keyboard *keyboard,
struct wlr_event_keyboard_key *event) {
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xkb_keycode_t keycode = event->keycode + 8;
uint32_t modifiers;
const xkb_keysym_t *keysyms;
size_t keysyms_len = keyboard_keysyms_translated(keyboard, keycode,
&keysyms, &modifiers);
bool handled = keyboard_handle_keysyms(keyboard,
keyboard->pressed_keysyms_translated, modifiers, keysyms, keysyms_len,
event->state);
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if (!handled) {
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keysyms_len = keyboard_keysyms_raw(keyboard, keycode, &keysyms,
&modifiers);
handled = keyboard_handle_keysyms(keyboard,
keyboard->pressed_keysyms_raw, modifiers, keysyms, keysyms_len,
event->state);
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}
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if (!handled) {
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wlr_seat_set_keyboard(keyboard->seat->seat, keyboard->device);
wlr_seat_keyboard_notify_key(keyboard->seat->seat, event->time_msec,
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event->keycode, event->state);
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}
}
void roots_keyboard_handle_modifiers(struct roots_keyboard *r_keyboard) {
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struct wlr_seat *seat = r_keyboard->seat->seat;
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wlr_seat_set_keyboard(seat, r_keyboard->device);
wlr_seat_keyboard_notify_modifiers(seat);
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}
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static void keyboard_config_merge(struct roots_keyboard_config *config,
struct roots_keyboard_config *fallback) {
if (fallback == NULL) {
return;
}
if (config->rules == NULL) {
config->rules = fallback->rules;
}
if (config->model == NULL) {
config->model = fallback->model;
}
if (config->layout == NULL) {
config->layout = fallback->layout;
}
if (config->variant == NULL) {
config->variant = fallback->variant;
}
if (config->options == NULL) {
config->options = fallback->options;
}
if (config->meta_key == 0) {
config->meta_key = fallback->meta_key;
}
if (config->name == NULL) {
config->name = fallback->name;
}
}
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struct roots_keyboard *roots_keyboard_create(struct wlr_input_device *device,
struct roots_input *input) {
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struct roots_keyboard *keyboard = calloc(sizeof(struct roots_keyboard), 1);
if (keyboard == NULL) {
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return NULL;
}
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device->data = keyboard;
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keyboard->device = device;
keyboard->input = input;
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struct roots_keyboard_config *config =
calloc(1, sizeof(struct roots_keyboard_config));
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if (config == NULL) {
free(keyboard);
return NULL;
}
keyboard_config_merge(config, roots_config_get_keyboard(input->config, device));
keyboard_config_merge(config, roots_config_get_keyboard(input->config, NULL));
struct roots_keyboard_config env_config = {
.rules = getenv("XKB_DEFAULT_RULES"),
.model = getenv("XKB_DEFAULT_MODEL"),
.layout = getenv("XKB_DEFAULT_LAYOUT"),
.variant = getenv("XKB_DEFAULT_VARIANT"),
.options = getenv("XKB_DEFAULT_OPTIONS"),
};
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keyboard_config_merge(config, &env_config);
keyboard->config = config;
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struct xkb_rule_names rules;
memset(&rules, 0, sizeof(rules));
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rules.rules = config->rules;
rules.model = config->model;
rules.layout = config->layout;
rules.variant = config->variant;
rules.options = config->options;
struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
if (context == NULL) {
wlr_log(L_ERROR, "Cannot create XKB context");
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return NULL;
}
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wlr_keyboard_set_keymap(device->keyboard, xkb_map_new_from_names(context,
&rules, XKB_KEYMAP_COMPILE_NO_FLAGS));
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xkb_context_unref(context);
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return keyboard;
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}
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void roots_keyboard_destroy(struct roots_keyboard *keyboard) {
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wl_list_remove(&keyboard->link);
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free(keyboard->config);
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free(keyboard);
}