swayfx/sway/input/keyboard.c

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#include <assert.h>
#include <limits.h>
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#include <wlr/backend/multi.h>
#include <wlr/backend/session.h>
#include <wlr/types/wlr_idle.h>
#include <wlr/interfaces/wlr_keyboard.h>
#include "sway/commands.h"
#include "sway/desktop/transaction.h"
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#include "sway/input/input-manager.h"
#include "sway/input/keyboard.h"
#include "sway/input/seat.h"
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#include "log.h"
/**
* Remove all key ids associated to a keycode from the list of pressed keys
*/
static void state_erase_key(struct sway_shortcut_state *state,
uint32_t keycode) {
size_t j = 0;
for (size_t i = 0; i < state->npressed; ++i) {
if (i > j) {
state->pressed_keys[j] = state->pressed_keys[i];
state->pressed_keycodes[j] = state->pressed_keycodes[i];
}
if (state->pressed_keycodes[i] != keycode) {
++j;
}
}
while(state->npressed > j) {
--state->npressed;
state->pressed_keys[state->npressed] = 0;
state->pressed_keycodes[state->npressed] = 0;
}
}
/**
* Add a key id (with associated keycode) to the list of pressed keys,
* if the list is not full.
*/
static void state_add_key(struct sway_shortcut_state *state,
uint32_t keycode, uint32_t key_id) {
if (state->npressed >= SWAY_KEYBOARD_PRESSED_KEYS_CAP) {
return;
}
size_t i = 0;
while (i < state->npressed && state->pressed_keys[i] < key_id) {
++i;
}
size_t j = state->npressed;
while (j > i) {
state->pressed_keys[j] = state->pressed_keys[j - 1];
state->pressed_keycodes[j] = state->pressed_keycodes[j - 1];
--j;
}
state->pressed_keys[i] = key_id;
state->pressed_keycodes[i] = keycode;
state->npressed++;
}
/**
* Update the shortcut model state in response to new input
*/
static void update_shortcut_state(struct sway_shortcut_state *state,
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struct wlr_event_keyboard_key *event, uint32_t new_key,
uint32_t raw_modifiers) {
bool last_key_was_a_modifier = raw_modifiers != state->last_raw_modifiers;
state->last_raw_modifiers = raw_modifiers;
if (last_key_was_a_modifier && state->last_keycode) {
// Last pressed key before this one was a modifier
state_erase_key(state, state->last_keycode);
}
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if (event->state == WLR_KEY_PRESSED) {
// Add current key to set; there may be duplicates
state_add_key(state, event->keycode, new_key);
state->last_keycode = event->keycode;
} else {
state_erase_key(state, event->keycode);
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}
}
/**
* If one exists, finds a binding which matches the shortcut model state,
* current modifiers, release state, and locked state.
*/
static void get_active_binding(const struct sway_shortcut_state *state,
list_t *bindings, struct sway_binding **current_binding,
uint32_t modifiers, bool release, bool locked) {
for (int i = 0; i < bindings->length; ++i) {
struct sway_binding *binding = bindings->items[i];
bool binding_locked = binding->flags & BINDING_LOCKED;
bool binding_release = binding->flags & BINDING_RELEASE;
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if (modifiers ^ binding->modifiers ||
state->npressed != (size_t)binding->keys->length ||
release != binding_release ||
locked > binding_locked) {
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continue;
}
bool match = true;
for (size_t j = 0; j < state->npressed; j++) {
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uint32_t key = *(uint32_t *)binding->keys->items[j];
if (key != state->pressed_keys[j]) {
match = false;
break;
}
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}
if (!match) {
continue;
}
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if (*current_binding && *current_binding != binding) {
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wlr_log(WLR_DEBUG, "encountered duplicate bindings %d and %d",
(*current_binding)->order, binding->order);
} else {
*current_binding = binding;
}
return;
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}
}
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/**
* Execute a built-in, hardcoded compositor binding. These are triggered from a
* single keysym.
*
* 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_execute_compositor_binding(struct sway_keyboard *keyboard,
const xkb_keysym_t *pressed_keysyms, uint32_t modifiers, size_t keysyms_len) {
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for (size_t i = 0; i < keysyms_len; ++i) {
xkb_keysym_t keysym = pressed_keysyms[i];
if (keysym >= XKB_KEY_XF86Switch_VT_1 &&
keysym <= XKB_KEY_XF86Switch_VT_12) {
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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}
}
return false;
}
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/**
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* Get keysyms and modifiers from the keyboard as xkb sees them.
*
* This uses the xkb keysyms translation based on pressed modifiers and clears
* the consumed modifiers from the list of modifiers passed to keybind
* detection.
*
* On US layout, pressing Alt+Shift+2 will trigger Alt+@.
*/
static size_t keyboard_keysyms_translated(struct sway_keyboard *keyboard,
xkb_keycode_t keycode, const xkb_keysym_t **keysyms,
uint32_t *modifiers) {
struct wlr_input_device *device =
keyboard->seat_device->input_device->wlr_device;
*modifiers = wlr_keyboard_get_modifiers(device->keyboard);
xkb_mod_mask_t consumed = xkb_state_key_get_consumed_mods2(
device->keyboard->xkb_state, keycode, XKB_CONSUMED_MODE_XKB);
*modifiers = *modifiers & ~consumed;
return xkb_state_key_get_syms(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.
*
* This avoids the xkb keysym translation based on modifiers considered pressed
* in the state.
*
* This will trigger keybinds such as Alt+Shift+2.
*/
static size_t keyboard_keysyms_raw(struct sway_keyboard *keyboard,
xkb_keycode_t keycode, const xkb_keysym_t **keysyms,
uint32_t *modifiers) {
struct wlr_input_device *device =
keyboard->seat_device->input_device->wlr_device;
*modifiers = wlr_keyboard_get_modifiers(device->keyboard);
xkb_layout_index_t layout_index = xkb_state_key_get_layout(
device->keyboard->xkb_state, keycode);
return xkb_keymap_key_get_syms_by_level(device->keyboard->keymap,
keycode, layout_index, 0, keysyms);
}
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static void handle_keyboard_key(struct wl_listener *listener, void *data) {
struct sway_keyboard *keyboard =
wl_container_of(listener, keyboard, keyboard_key);
struct sway_seat* seat = keyboard->seat_device->sway_seat;
struct wlr_seat *wlr_seat = seat->wlr_seat;
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struct wlr_input_device *wlr_device =
keyboard->seat_device->input_device->wlr_device;
wlr_idle_notify_activity(seat->input->server->idle, wlr_seat);
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struct wlr_event_keyboard_key *event = data;
bool input_inhibited = seat->exclusive_client != NULL;
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// Identify new keycode, raw keysym(s), and translated keysym(s)
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xkb_keycode_t keycode = event->keycode + 8;
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const xkb_keysym_t *translated_keysyms;
uint32_t translated_modifiers;
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size_t translated_keysyms_len =
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keyboard_keysyms_translated(keyboard, keycode, &translated_keysyms,
&translated_modifiers);
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const xkb_keysym_t *raw_keysyms;
uint32_t raw_modifiers;
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size_t raw_keysyms_len =
keyboard_keysyms_raw(keyboard, keycode, &raw_keysyms, &raw_modifiers);
uint32_t code_modifiers = wlr_keyboard_get_modifiers(wlr_device->keyboard);
// Update shortcut model state
update_shortcut_state(&keyboard->state_keycodes, event,
(uint32_t)keycode, code_modifiers);
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for (size_t i = 0; i < translated_keysyms_len; ++i) {
update_shortcut_state(&keyboard->state_keysyms_translated,
event, (uint32_t)translated_keysyms[i],
code_modifiers);
}
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for (size_t i = 0; i < raw_keysyms_len; ++i) {
update_shortcut_state(&keyboard->state_keysyms_raw,
event, (uint32_t)raw_keysyms[i],
code_modifiers);
}
bool handled = false;
// Identify active release binding
struct sway_binding *binding_released = NULL;
get_active_binding(&keyboard->state_keycodes,
config->current_mode->keycode_bindings, &binding_released,
code_modifiers, true, input_inhibited);
get_active_binding(&keyboard->state_keysyms_translated,
config->current_mode->keysym_bindings, &binding_released,
translated_modifiers, true, input_inhibited);
get_active_binding(&keyboard->state_keysyms_raw,
config->current_mode->keysym_bindings, &binding_released,
raw_modifiers, true, input_inhibited);
// Execute stored release binding once no longer active
if (keyboard->held_binding && binding_released != keyboard->held_binding &&
event->state == WLR_KEY_RELEASED) {
seat_execute_command(seat, keyboard->held_binding);
handled = true;
}
if (binding_released != keyboard->held_binding) {
keyboard->held_binding = NULL;
}
if (binding_released && event->state == WLR_KEY_PRESSED) {
keyboard->held_binding = binding_released;
}
// Identify and execute active pressed binding
struct sway_binding *next_repeat_binding = NULL;
if (event->state == WLR_KEY_PRESSED) {
struct sway_binding *binding_pressed = NULL;
get_active_binding(&keyboard->state_keycodes,
config->current_mode->keycode_bindings, &binding_pressed,
code_modifiers, false, input_inhibited);
get_active_binding(&keyboard->state_keysyms_translated,
config->current_mode->keysym_bindings, &binding_pressed,
translated_modifiers, false, input_inhibited);
get_active_binding(&keyboard->state_keysyms_raw,
config->current_mode->keysym_bindings, &binding_pressed,
raw_modifiers, false, input_inhibited);
if (binding_pressed) {
seat_execute_command(seat, binding_pressed);
handled = true;
if ((binding_pressed->flags & BINDING_RELOAD) == 0) {
next_repeat_binding = binding_pressed;
}
}
}
// Set up (or clear) keyboard repeat for a pressed binding
if (next_repeat_binding && wlr_device->keyboard->repeat_info.delay > 0) {
keyboard->repeat_binding = next_repeat_binding;
if (wl_event_source_timer_update(keyboard->key_repeat_source,
wlr_device->keyboard->repeat_info.delay) < 0) {
wlr_log(WLR_DEBUG, "failed to set key repeat timer");
}
} else if (keyboard->repeat_binding) {
keyboard->repeat_binding = NULL;
if (wl_event_source_timer_update(keyboard->key_repeat_source, 0) < 0) {
wlr_log(WLR_DEBUG, "failed to disarm key repeat timer");
}
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}
// Compositor bindings
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if (!handled && event->state == WLR_KEY_PRESSED) {
handled = keyboard_execute_compositor_binding(
keyboard, translated_keysyms, translated_modifiers,
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translated_keysyms_len);
}
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if (!handled && event->state == WLR_KEY_PRESSED) {
handled = keyboard_execute_compositor_binding(
keyboard, raw_keysyms, raw_modifiers,
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raw_keysyms_len);
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}
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if (!handled || event->state == WLR_KEY_RELEASED) {
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wlr_seat_set_keyboard(wlr_seat, wlr_device);
wlr_seat_keyboard_notify_key(wlr_seat, event->time_msec,
event->keycode, event->state);
}
transaction_commit_dirty();
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}
static int handle_keyboard_repeat(void *data) {
struct sway_keyboard *keyboard = (struct sway_keyboard *)data;
struct wlr_keyboard *wlr_device =
keyboard->seat_device->input_device->wlr_device->keyboard;
if (keyboard->repeat_binding) {
if (wlr_device->repeat_info.rate > 0) {
// We queue the next event first, as the command might cancel it
if (wl_event_source_timer_update(keyboard->key_repeat_source,
1000 / wlr_device->repeat_info.rate) < 0) {
wlr_log(WLR_DEBUG, "failed to update key repeat timer");
}
}
seat_execute_command(keyboard->seat_device->sway_seat,
keyboard->repeat_binding);
transaction_commit_dirty();
}
return 0;
}
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static void handle_keyboard_modifiers(struct wl_listener *listener,
void *data) {
struct sway_keyboard *keyboard =
wl_container_of(listener, keyboard, keyboard_modifiers);
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struct wlr_seat *wlr_seat = keyboard->seat_device->sway_seat->wlr_seat;
struct wlr_input_device *wlr_device =
keyboard->seat_device->input_device->wlr_device;
wlr_seat_set_keyboard(wlr_seat, wlr_device);
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wlr_seat_keyboard_notify_modifiers(wlr_seat, &wlr_device->keyboard->modifiers);
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}
struct sway_keyboard *sway_keyboard_create(struct sway_seat *seat,
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struct sway_seat_device *device) {
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struct sway_keyboard *keyboard =
calloc(1, sizeof(struct sway_keyboard));
if (!sway_assert(keyboard, "could not allocate sway keyboard")) {
return NULL;
}
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keyboard->seat_device = device;
device->keyboard = keyboard;
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wl_list_init(&keyboard->keyboard_key.link);
wl_list_init(&keyboard->keyboard_modifiers.link);
keyboard->key_repeat_source = wl_event_loop_add_timer(server.wl_event_loop,
handle_keyboard_repeat, keyboard);
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return keyboard;
}
void sway_keyboard_configure(struct sway_keyboard *keyboard) {
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struct xkb_rule_names rules;
memset(&rules, 0, sizeof(rules));
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struct input_config *input_config =
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input_device_get_config(keyboard->seat_device->input_device);
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struct wlr_input_device *wlr_device =
keyboard->seat_device->input_device->wlr_device;
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if (input_config && input_config->xkb_layout) {
rules.layout = input_config->xkb_layout;
} else {
rules.layout = getenv("XKB_DEFAULT_LAYOUT");
}
if (input_config && input_config->xkb_model) {
rules.model = input_config->xkb_model;
} else {
rules.model = getenv("XKB_DEFAULT_MODEL");
}
if (input_config && input_config->xkb_options) {
rules.options = input_config->xkb_options;
} else {
rules.options = getenv("XKB_DEFAULT_OPTIONS");
}
if (input_config && input_config->xkb_rules) {
rules.rules = input_config->xkb_rules;
} else {
rules.rules = getenv("XKB_DEFAULT_RULES");
}
if (input_config && input_config->xkb_variant) {
rules.variant = input_config->xkb_variant;
} else {
rules.variant = getenv("XKB_DEFAULT_VARIANT");
}
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struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
if (!sway_assert(context, "cannot create XKB context")) {
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return;
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}
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struct xkb_keymap *keymap =
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xkb_keymap_new_from_names(context, &rules, XKB_KEYMAP_COMPILE_NO_FLAGS);
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if (!keymap) {
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wlr_log(WLR_DEBUG, "cannot configure keyboard: keymap does not exist");
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xkb_context_unref(context);
return;
}
xkb_keymap_unref(keyboard->keymap);
keyboard->keymap = keymap;
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wlr_keyboard_set_keymap(wlr_device->keyboard, keyboard->keymap);
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xkb_mod_mask_t locked_mods = 0;
if (input_config && input_config->xkb_numlock > 0) {
xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap, XKB_MOD_NAME_NUM);
if (mod_index != XKB_MOD_INVALID) {
locked_mods |= (uint32_t)1 << mod_index;
}
}
if (input_config && input_config->xkb_capslock > 0) {
xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap, XKB_MOD_NAME_CAPS);
if (mod_index != XKB_MOD_INVALID) {
locked_mods |= (uint32_t)1 << mod_index;
}
}
if (locked_mods) {
wlr_keyboard_notify_modifiers(wlr_device->keyboard, 0, 0, locked_mods, 0);
uint32_t leds = 0;
for (uint32_t i = 0; i < WLR_LED_COUNT; ++i) {
if (xkb_state_led_index_is_active(wlr_device->keyboard->xkb_state,
wlr_device->keyboard->led_indexes[i])) {
leds |= (1 << i);
}
}
wlr_keyboard_led_update(wlr_device->keyboard, leds);
}
if (input_config && input_config->repeat_delay != INT_MIN
&& input_config->repeat_rate != INT_MIN) {
wlr_keyboard_set_repeat_info(wlr_device->keyboard,
input_config->repeat_rate, input_config->repeat_delay);
} else {
wlr_keyboard_set_repeat_info(wlr_device->keyboard, 25, 600);
}
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xkb_context_unref(context);
struct wlr_seat *seat = keyboard->seat_device->sway_seat->wlr_seat;
wlr_seat_set_keyboard(seat, wlr_device);
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wl_list_remove(&keyboard->keyboard_key.link);
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wl_signal_add(&wlr_device->keyboard->events.key, &keyboard->keyboard_key);
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keyboard->keyboard_key.notify = handle_keyboard_key;
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wl_list_remove(&keyboard->keyboard_modifiers.link);
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wl_signal_add( &wlr_device->keyboard->events.modifiers,
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&keyboard->keyboard_modifiers);
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keyboard->keyboard_modifiers.notify = handle_keyboard_modifiers;
}
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void sway_keyboard_destroy(struct sway_keyboard *keyboard) {
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if (!keyboard) {
return;
}
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if (keyboard->keymap) {
xkb_keymap_unref(keyboard->keymap);
}
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wl_list_remove(&keyboard->keyboard_key.link);
wl_list_remove(&keyboard->keyboard_modifiers.link);
wl_event_source_remove(keyboard->key_repeat_source);
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free(keyboard);
}