From 544ddde113657a932275399f577a422a809d2880 Mon Sep 17 00:00:00 2001 From: Pascal Getreuer Date: Mon, 27 Jan 2025 03:32:23 -0800 Subject: [Core] Add Chordal Hold, an "opposite hands rule" tap-hold option similar to Achordion, Bilateral Combinations. (#24560) * Chordal Hold: restrict what chords settle as hold * Chordal Hold: docs and further improvements * Fix formatting. * Doc rewording and minor edit. * Support Chordal Hold of multiple tap-hold keys. * Fix formatting. * Simplification and additional test. * Fix formatting. * Tighten tests. * Add test two_mod_taps_same_hand_hold_til_timeout. * Revise handing of pairs of tap-hold keys. * Generate a default chordal_hold_layout. * Document chordal_hold_handedness(). * Add license notice to new and branched files in PR. * Add `tapping.chordal_hold` property for info.json. * Update docs/reference_info_json.md * Revise "hand" jsonschema. * Chordal Hold: Improved layout handedness heuristic. This commit improves the heuristic used in generate-keyboard-c for inferring key handedness from keyboard.json geometry data. Heuristic summary: 1. If the layout is symmetric (e.g. most split keyboards), guess the handedness based on the sign of (x - layout_x_midpoint). 2. Otherwise, if the layout has a key of >=6u width, it is probably the spacebar. Form a dividing line through the spacebar, nearly vertical but with a slight angle to follow typical row stagger. 3. Otherwise, assume handedness based on the widest horizontal separation. I have tested this strategy on a couple dozen keyboards and found it to work reliably. * Use Optional instead of `| None`. * Refactor to avoid lambdas. * Remove trailing comma in chordal_hold_layout. * Minor docs edits. * Revise to allow combining multiple same-hand mods. This commit revises Chordal Hold as described in discussion in https://github.com/qmk/qmk_firmware/pull/24560#discussion_r1894655238 1. In "RCTL_T(KC_A)↓, RSFT_T(KC_C)↓, RCTL_T(KC_A)↑" before the tapping term, RCTL_T(KC_A) is settled as tapped. 2. In "RCTL_T(KC_A)↓, RSFT_T(KC_C)↓, RSFT_T(KC_C)↑", both RCTL_T(KC_A) and RSFT_T(KC_C) are settled as tapped. 3. In "RCTL_T(KC_A)↓, RSFT_T(KC_C)↓, KC_U↓" (all keys on the same side), both RCTL_T(KC_A) and RSFT_T(KC_C) are settled as tapped. 4. In "RCTL_T(KC_A)↓, RSFT_T(KC_C)↓, LSFT_T(KC_T)↓", with the third key on the other side, we allow Permissive Hold or Hold On Other Keypress to decide how/when to settle the keys. 5. In "RCTL_T(KC_A)↓, RSFT_T(KC_C)↓" held until the tapping term, the keys are settled as held. 1–3 provide same-hand roll protection. 4–5 are for combining multiple same-hand modifiers. I've updated the unit tests and have been running it on my keyboard, for a few hours so far, and all seems good. I really like this scheme. It allows combining same-side mods, yet it also has roll protection on streaks. For me, this feels like Achordion, but clearly better streak handling and improved responsiveness. * Fix formatting. * Add a couple tests with LT keys. * Remove stale use of CHORDAL_HOLD_LAYOUT. * Fix misspelling lastest -> latest * Handling tweak for LTs and tests. * Fix formatting. * More tests with LT keys. * Fix formatting.--- quantum/action_tapping.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) (limited to 'quantum/action_tapping.h') diff --git a/quantum/action_tapping.h b/quantum/action_tapping.h index 6b518b8298..c3c7b999ec 100644 --- a/quantum/action_tapping.h +++ b/quantum/action_tapping.h @@ -46,6 +46,71 @@ bool get_permissive_hold(uint16_t keycode, keyrecord_t *record); bool get_retro_tapping(uint16_t keycode, keyrecord_t *record); bool get_hold_on_other_key_press(uint16_t keycode, keyrecord_t *record); +#ifdef CHORDAL_HOLD +/** + * Callback to say when a key chord before the tapping term may be held. + * + * In keymap.c, define the callback + * + * bool get_chordal_hold(uint16_t tap_hold_keycode, + * keyrecord_t* tap_hold_record, + * uint16_t other_keycode, + * keyrecord_t* other_record) { + * // Conditions... + * } + * + * This callback is called when: + * + * 1. `tap_hold_keycode` is pressed. + * 2. `other_keycode` is pressed while `tap_hold_keycode` is still held, + * provided `other_keycode` is *not* also a tap-hold key and it is pressed + * before the tapping term. + * + * If false is returned, this has the effect of immediately settling the + * tap-hold key as tapped. If true is returned, the tap-hold key is still + * unsettled, and may be settled as held depending on configuration and + * subsequent events. + * + * @param tap_hold_keycode Keycode of the tap-hold key. + * @param tap_hold_record Record from the tap-hold press event. + * @param other_keycode Keycode of the other key. + * @param other_record Record from the other key's press event. + * @return True if the tap-hold key may be considered held; false if tapped. + */ +bool get_chordal_hold(uint16_t tap_hold_keycode, keyrecord_t *tap_hold_record, uint16_t other_keycode, keyrecord_t *other_record); + +/** + * Default "opposite hands rule" for whether a key chord may settle as held. + * + * This function returns true when the tap-hold key and other key are on + * "opposite hands." In detail, handedness of the two keys are compared. If + * handedness values differ, or if either handedness is '*', the function + * returns true, indicating that it may be held. Otherwise, it returns false, + * in which case the tap-hold key is immediately settled at tapped. + * + * @param tap_hold_record Record of the active tap-hold key press. + * @param other_record Record of the other, interrupting key press. + * @return True if the tap-hold key may be considered held; false if tapped. + */ +bool get_chordal_hold_default(keyrecord_t *tap_hold_record, keyrecord_t *other_record); + +/** + * Gets the handedness of a key. + * + * This function returns: + * 'L' for keys pressed by the left hand, + * 'R' for keys on the right hand, + * '*' for keys exempt from the "opposite hands rule." This could be used + * perhaps on thumb keys or keys that might be pressed by either hand. + * + * @param key A key matrix position. + * @return Handedness value. + */ +char chordal_hold_handedness(keypos_t key); + +extern const char chordal_hold_layout[MATRIX_ROWS][MATRIX_COLS] PROGMEM; +#endif + #ifdef DYNAMIC_TAPPING_TERM_ENABLE extern uint16_t g_tapping_term; #endif -- cgit v1.2.3