forked from kofal.net/zmk
feat(behaviors): Add Tap-Dance behavior
This commit is contained in:
Kurtis Lew
GitHub
259
app/src/behaviors/behavior_tap_dance.c
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259
app/src/behaviors/behavior_tap_dance.c
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/*
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* Copyright (c) 2022 The ZMK Contributors
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*
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* SPDX-License-Identifier: MIT
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*/
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#define DT_DRV_COMPAT zmk_behavior_tap_dance
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#include <device.h>
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#include <drivers/behavior.h>
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#include <logging/log.h>
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#include <zmk/behavior.h>
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#include <zmk/keymap.h>
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#include <zmk/matrix.h>
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#include <zmk/event_manager.h>
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#include <zmk/events/position_state_changed.h>
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#include <zmk/events/keycode_state_changed.h>
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#include <zmk/hid.h>
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LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
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#if DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT)
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#define ZMK_BHV_TAP_DANCE_MAX_HELD 10
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#define ZMK_BHV_TAP_DANCE_POSITION_FREE ULONG_MAX
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struct behavior_tap_dance_config {
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uint32_t tapping_term_ms;
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size_t behavior_count;
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struct zmk_behavior_binding *behaviors;
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};
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struct active_tap_dance {
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// Tap Dance Data
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int counter;
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uint32_t position;
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uint32_t param1;
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uint32_t param2;
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bool is_pressed;
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const struct behavior_tap_dance_config *config;
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// Timer Data
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bool timer_started;
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bool timer_cancelled;
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bool tap_dance_decided;
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int64_t release_at;
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struct k_delayed_work release_timer;
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};
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struct active_tap_dance active_tap_dances[ZMK_BHV_TAP_DANCE_MAX_HELD] = {};
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static struct active_tap_dance *find_tap_dance(uint32_t position) {
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for (int i = 0; i < ZMK_BHV_TAP_DANCE_MAX_HELD; i++) {
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if (active_tap_dances[i].position == position && !active_tap_dances[i].timer_cancelled) {
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return &active_tap_dances[i];
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}
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}
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return NULL;
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}
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static int new_tap_dance(uint32_t position, const struct behavior_tap_dance_config *config,
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struct active_tap_dance **tap_dance) {
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for (int i = 0; i < ZMK_BHV_TAP_DANCE_MAX_HELD; i++) {
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struct active_tap_dance *const ref_dance = &active_tap_dances[i];
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if (ref_dance->position == ZMK_BHV_TAP_DANCE_POSITION_FREE) {
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ref_dance->counter = 0;
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ref_dance->position = position;
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ref_dance->config = config;
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ref_dance->release_at = 0;
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ref_dance->is_pressed = true;
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ref_dance->timer_started = true;
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ref_dance->timer_cancelled = false;
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ref_dance->tap_dance_decided = false;
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*tap_dance = ref_dance;
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return 0;
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}
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}
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return -ENOMEM;
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}
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static void clear_tap_dance(struct active_tap_dance *tap_dance) {
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tap_dance->position = ZMK_BHV_TAP_DANCE_POSITION_FREE;
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}
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static int stop_timer(struct active_tap_dance *tap_dance) {
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int timer_cancel_result = k_delayed_work_cancel(&tap_dance->release_timer);
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if (timer_cancel_result == -EINPROGRESS) {
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// too late to cancel, we'll let the timer handler clear up.
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tap_dance->timer_cancelled = true;
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}
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return timer_cancel_result;
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}
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static void reset_timer(struct active_tap_dance *tap_dance,
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struct zmk_behavior_binding_event event) {
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tap_dance->release_at = event.timestamp + tap_dance->config->tapping_term_ms;
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int32_t ms_left = tap_dance->release_at - k_uptime_get();
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if (ms_left > 0) {
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k_delayed_work_submit(&tap_dance->release_timer, K_MSEC(ms_left));
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LOG_DBG("Successfully reset timer at position %d", tap_dance->position);
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}
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}
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static inline int press_tap_dance_behavior(struct active_tap_dance *tap_dance, int64_t timestamp) {
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tap_dance->tap_dance_decided = true;
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struct zmk_behavior_binding binding = tap_dance->config->behaviors[tap_dance->counter - 1];
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struct zmk_behavior_binding_event event = {
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.position = tap_dance->position,
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.timestamp = timestamp,
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};
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return behavior_keymap_binding_pressed(&binding, event);
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}
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static inline int release_tap_dance_behavior(struct active_tap_dance *tap_dance,
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int64_t timestamp) {
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struct zmk_behavior_binding binding = tap_dance->config->behaviors[tap_dance->counter - 1];
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struct zmk_behavior_binding_event event = {
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.position = tap_dance->position,
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.timestamp = timestamp,
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};
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clear_tap_dance(tap_dance);
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return behavior_keymap_binding_released(&binding, event);
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}
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static int on_tap_dance_binding_pressed(struct zmk_behavior_binding *binding,
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struct zmk_behavior_binding_event event) {
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const struct device *dev = device_get_binding(binding->behavior_dev);
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const struct behavior_tap_dance_config *cfg = dev->config;
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struct active_tap_dance *tap_dance;
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tap_dance = find_tap_dance(event.position);
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if (tap_dance == NULL) {
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if (new_tap_dance(event.position, cfg, &tap_dance) == -ENOMEM) {
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LOG_ERR("Unable to create new tap dance. Insufficient space in active_tap_dances[].");
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return ZMK_BEHAVIOR_OPAQUE;
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}
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LOG_DBG("%d created new tap dance", event.position);
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}
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tap_dance->is_pressed = true;
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LOG_DBG("%d tap dance pressed", event.position);
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stop_timer(tap_dance);
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// Increment the counter on keypress. If the counter has reached its maximum
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// value, invoke the last binding available.
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if (tap_dance->counter < cfg->behavior_count) {
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tap_dance->counter++;
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}
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if (tap_dance->counter == cfg->behavior_count) {
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// LOG_DBG("Tap dance has been decided via maximum counter value");
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press_tap_dance_behavior(tap_dance, event.timestamp);
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return ZMK_EV_EVENT_BUBBLE;
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}
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reset_timer(tap_dance, event);
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return ZMK_BEHAVIOR_OPAQUE;
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}
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static int on_tap_dance_binding_released(struct zmk_behavior_binding *binding,
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struct zmk_behavior_binding_event event) {
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LOG_DBG("%d tap dance keybind released", event.position);
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struct active_tap_dance *tap_dance = find_tap_dance(event.position);
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if (tap_dance == NULL) {
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LOG_ERR("ACTIVE TAP DANCE CLEARED TOO EARLY");
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return ZMK_BEHAVIOR_OPAQUE;
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}
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tap_dance->is_pressed = false;
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if (tap_dance->tap_dance_decided) {
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release_tap_dance_behavior(tap_dance, event.timestamp);
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}
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return ZMK_BEHAVIOR_OPAQUE;
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}
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void behavior_tap_dance_timer_handler(struct k_work *item) {
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struct active_tap_dance *tap_dance = CONTAINER_OF(item, struct active_tap_dance, release_timer);
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if (tap_dance->position == ZMK_BHV_TAP_DANCE_POSITION_FREE) {
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return;
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}
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if (tap_dance->timer_cancelled) {
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return;
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}
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LOG_DBG("Tap dance has been decided via timer. Counter reached: %d", tap_dance->counter);
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press_tap_dance_behavior(tap_dance, tap_dance->release_at);
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if (tap_dance->is_pressed) {
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return;
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}
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release_tap_dance_behavior(tap_dance, tap_dance->release_at);
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}
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static const struct behavior_driver_api behavior_tap_dance_driver_api = {
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.binding_pressed = on_tap_dance_binding_pressed,
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.binding_released = on_tap_dance_binding_released,
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};
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static int tap_dance_position_state_changed_listener(const zmk_event_t *eh);
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ZMK_LISTENER(behavior_tap_dance, tap_dance_position_state_changed_listener);
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ZMK_SUBSCRIPTION(behavior_tap_dance, zmk_position_state_changed);
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static int tap_dance_position_state_changed_listener(const zmk_event_t *eh) {
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struct zmk_position_state_changed *ev = as_zmk_position_state_changed(eh);
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if (ev == NULL) {
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return ZMK_EV_EVENT_BUBBLE;
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}
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if (!ev->state) {
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LOG_DBG("Ignore upstroke at position %d.", ev->position);
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return ZMK_EV_EVENT_BUBBLE;
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}
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for (int i = 0; i < ZMK_BHV_TAP_DANCE_MAX_HELD; i++) {
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struct active_tap_dance *tap_dance = &active_tap_dances[i];
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if (tap_dance->position == ZMK_BHV_TAP_DANCE_POSITION_FREE) {
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continue;
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}
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if (tap_dance->position == ev->position) {
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continue;
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}
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stop_timer(tap_dance);
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LOG_DBG("Tap dance interrupted, activating tap-dance at %d", tap_dance->position);
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if (!tap_dance->tap_dance_decided) {
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press_tap_dance_behavior(tap_dance, ev->timestamp);
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if (!tap_dance->is_pressed) {
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release_tap_dance_behavior(tap_dance, ev->timestamp);
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}
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return ZMK_EV_EVENT_BUBBLE;
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}
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}
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return ZMK_EV_EVENT_BUBBLE;
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}
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static int behavior_tap_dance_init(const struct device *dev) {
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static bool init_first_run = true;
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if (init_first_run) {
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for (int i = 0; i < ZMK_BHV_TAP_DANCE_MAX_HELD; i++) {
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k_delayed_work_init(&active_tap_dances[i].release_timer,
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behavior_tap_dance_timer_handler);
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clear_tap_dance(&active_tap_dances[i]);
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}
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}
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init_first_run = false;
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return 0;
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}
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#define _TRANSFORM_ENTRY(idx, node) ZMK_KEYMAP_EXTRACT_BINDING(idx, node),
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#define TRANSFORMED_BINDINGS(node) \
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{ UTIL_LISTIFY(DT_INST_PROP_LEN(node, bindings), _TRANSFORM_ENTRY, DT_DRV_INST(node)) }
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#define KP_INST(n) \
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static struct zmk_behavior_binding \
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behavior_tap_dance_config_##n##_bindings[DT_INST_PROP_LEN(n, bindings)] = \
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TRANSFORMED_BINDINGS(n); \
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static struct behavior_tap_dance_config behavior_tap_dance_config_##n = { \
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.tapping_term_ms = DT_INST_PROP(n, tapping_term_ms), \
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.behaviors = behavior_tap_dance_config_##n##_bindings, \
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.behavior_count = DT_INST_PROP_LEN(n, bindings)}; \
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DEVICE_AND_API_INIT(behavior_tap_dance_##n, DT_INST_LABEL(n), behavior_tap_dance_init, NULL, \
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&behavior_tap_dance_config_##n, APPLICATION, \
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, &behavior_tap_dance_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(KP_INST)
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#endif
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