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283 lines
10 KiB
283 lines
10 KiB
// Copyright 2022-2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "repeat_key.h"
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#include "quantum_keycodes.h"
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// Variables saving the state of the last key press.
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static keyrecord_t last_record = {0};
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static uint8_t last_mods = 0;
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// Signed count of the number of times the last key has been repeated or
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// alternate repeated: it is 0 when a key is pressed normally, positive when
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// repeated, and negative when alternate repeated.
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static int8_t last_repeat_count = 0;
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// The repeat_count, but set to 0 outside of repeat_key_invoke() so that it is
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// nonzero only while a repeated key is being processed.
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static int8_t processing_repeat_count = 0;
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uint16_t get_last_keycode(void) {
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return last_record.keycode;
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}
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uint8_t get_last_mods(void) {
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return last_mods;
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}
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void set_last_keycode(uint16_t keycode) {
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set_last_record(keycode, &(keyrecord_t){
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#ifndef NO_ACTION_TAPPING
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.tap.interrupted = false,
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.tap.count = 1,
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#endif
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});
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}
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void set_last_mods(uint8_t mods) {
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last_mods = mods;
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}
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void set_last_record(uint16_t keycode, keyrecord_t* record) {
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last_record = *record;
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last_record.keycode = keycode;
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last_repeat_count = 0;
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}
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/** @brief Updates `last_repeat_count` in direction `dir`. */
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static void update_last_repeat_count(int8_t dir) {
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if (dir * last_repeat_count < 0) {
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last_repeat_count = dir;
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} else if (dir * last_repeat_count < 127) {
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last_repeat_count += dir;
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}
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}
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int8_t get_repeat_key_count(void) {
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return processing_repeat_count;
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}
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void repeat_key_invoke(const keyevent_t* event) {
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// It is possible (e.g. in rolled presses) that the last key changes while
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// the Repeat Key is pressed. To prevent stuck keys, it is important to
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// remember separately what key record was processed on press so that the
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// the corresponding record is generated on release.
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static keyrecord_t registered_record = {0};
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static int8_t registered_repeat_count = 0;
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// Since this function calls process_record(), it may recursively call
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// itself. We return early if `processing_repeat_count` is nonzero to
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// prevent infinite recursion.
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if (processing_repeat_count || !last_record.keycode) {
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return;
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}
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if (event->pressed) {
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update_last_repeat_count(1);
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// On press, apply the last mods state, stacking on top of current mods.
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register_weak_mods(last_mods);
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registered_record = last_record;
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registered_repeat_count = last_repeat_count;
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}
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// Generate a keyrecord and plumb it into the event pipeline.
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registered_record.event = *event;
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processing_repeat_count = registered_repeat_count;
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process_record(®istered_record);
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processing_repeat_count = 0;
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// On release, restore the mods state.
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if (!event->pressed) {
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unregister_weak_mods(last_mods);
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}
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}
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#ifndef NO_ALT_REPEAT_KEY
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/**
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* @brief Find alternate keycode from a table of opposing keycode pairs.
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* @param table Array of pairs of basic keycodes, declared as PROGMEM.
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* @param table_size_bytes The size of the table in bytes.
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* @param target The basic keycode to find.
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* @return The alternate basic keycode, or KC_NO if none was found.
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*
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* @note The table keycodes and target must be basic keycodes.
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*
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* This helper is used several times below to define alternate keys. Given a
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* table of pairs of basic keycodes, the function finds the pair containing
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* `target` and returns the other keycode in the pair.
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*/
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static uint8_t find_alt_keycode(const uint8_t (*table)[2], uint8_t table_size_bytes, uint8_t target) {
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const uint8_t* keycodes = (const uint8_t*)table;
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for (uint8_t i = 0; i < table_size_bytes; ++i) {
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if (target == pgm_read_byte(keycodes + i)) {
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// Xor (i ^ 1) the index to get the other element in the pair.
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return pgm_read_byte(keycodes + (i ^ 1));
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}
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}
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return KC_NO;
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}
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uint16_t get_alt_repeat_key_keycode(void) {
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uint16_t keycode = last_record.keycode;
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uint8_t mods = last_mods;
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// Call the user callback first to give it a chance to override the default
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// alternate key definitions that follow.
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uint16_t alt_keycode = get_alt_repeat_key_keycode_user(keycode, mods);
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if (alt_keycode != KC_TRANSPARENT) {
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return alt_keycode;
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}
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// Convert 8-bit mods to the 5-bit format used in keycodes. This is lossy:
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// if left and right handed mods were mixed, they all become right handed.
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mods = ((mods & 0xf0) ? /* set right hand bit */ 0x10 : 0)
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// Combine right and left hand mods.
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| (((mods >> 4) | mods) & 0xf);
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switch (keycode) {
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case QK_MODS ... QK_MODS_MAX: // Unpack modifier + basic key.
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mods |= QK_MODS_GET_MODS(keycode);
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keycode = QK_MODS_GET_BASIC_KEYCODE(keycode);
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break;
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# ifndef NO_ACTION_TAPPING
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case QK_MOD_TAP ... QK_MOD_TAP_MAX:
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keycode = QK_MOD_TAP_GET_TAP_KEYCODE(keycode);
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break;
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# ifndef NO_ACTION_LAYER
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case QK_LAYER_TAP ... QK_LAYER_TAP_MAX:
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keycode = QK_LAYER_TAP_GET_TAP_KEYCODE(keycode);
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break;
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# endif // NO_ACTION_LAYER
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# endif // NO_ACTION_TAPPING
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# ifdef SWAP_HANDS_ENABLE
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case QK_SWAP_HANDS ... QK_SWAP_HANDS_MAX:
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if (IS_SWAP_HANDS_KEYCODE(keycode)) {
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return KC_NO;
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}
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keycode = QK_SWAP_HANDS_GET_TAP_KEYCODE(keycode);
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break;
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# endif // SWAP_HANDS_ENABLE
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}
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if (IS_QK_BASIC(keycode)) {
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if ((mods & (MOD_LCTL | MOD_LALT | MOD_LGUI))) {
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// The last key was pressed with a modifier other than Shift.
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// The following maps
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// mod + F <-> mod + B
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// and a few others, supporting several core hotkeys used in
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// Emacs, Vim, less, and other programs.
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// clang-format off
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static const uint8_t pairs[][2] PROGMEM = {
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{KC_F , KC_B }, // Forward / Backward.
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{KC_D , KC_U }, // Down / Up.
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{KC_N , KC_P }, // Next / Previous.
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{KC_A , KC_E }, // Home / End.
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{KC_O , KC_I }, // Older / Newer in Vim jump list.
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};
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// clang-format on
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alt_keycode = find_alt_keycode(pairs, sizeof(pairs), keycode);
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} else {
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// The last key was pressed with no mods or only Shift. The
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// following map a few more Vim hotkeys.
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// clang-format off
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static const uint8_t pairs[][2] PROGMEM = {
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{KC_J , KC_K }, // Down / Up.
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{KC_H , KC_L }, // Left / Right.
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// These two lines map W and E to B, and B to W.
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{KC_W , KC_B }, // Forward / Backward by word.
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{KC_E , KC_B }, // Forward / Backward by word.
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};
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// clang-format on
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alt_keycode = find_alt_keycode(pairs, sizeof(pairs), keycode);
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}
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if (!alt_keycode) {
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// The following key pairs are considered with any mods.
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// clang-format off
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static const uint8_t pairs[][2] PROGMEM = {
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{KC_LEFT, KC_RGHT}, // Left / Right Arrow.
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{KC_UP , KC_DOWN}, // Up / Down Arrow.
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{KC_HOME, KC_END }, // Home / End.
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{KC_PGUP, KC_PGDN}, // Page Up / Page Down.
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{KC_BSPC, KC_DEL }, // Backspace / Delete.
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{KC_LBRC, KC_RBRC}, // Brackets [ ] and { }.
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#ifdef EXTRAKEY_ENABLE
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{KC_WBAK, KC_WFWD}, // Browser Back / Forward.
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{KC_MNXT, KC_MPRV}, // Next / Previous Media Track.
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{KC_MFFD, KC_MRWD}, // Fast Forward / Rewind Media.
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{KC_VOLU, KC_VOLD}, // Volume Up / Down.
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{KC_BRIU, KC_BRID}, // Brightness Up / Down.
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#endif // EXTRAKEY_ENABLE
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#ifdef MOUSEKEY_ENABLE
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{KC_MS_L, KC_MS_R}, // Mouse Cursor Left / Right.
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{KC_MS_U, KC_MS_D}, // Mouse Cursor Up / Down.
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{KC_WH_L, KC_WH_R}, // Mouse Wheel Left / Right.
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{KC_WH_U, KC_WH_D}, // Mouse Wheel Up / Down.
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#endif // MOUSEKEY_ENABLE
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};
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// clang-format on
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alt_keycode = find_alt_keycode(pairs, sizeof(pairs), keycode);
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}
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if (alt_keycode) {
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// Combine basic keycode with mods.
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return (mods << 8) | alt_keycode;
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}
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}
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return KC_NO; // No alternate key found.
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}
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void alt_repeat_key_invoke(const keyevent_t* event) {
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static keyrecord_t registered_record = {0};
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static int8_t registered_repeat_count = 0;
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// Since this function calls process_record(), it may recursively call
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// itself. We return early if `processing_repeat_count` is nonzero to
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// prevent infinite recursion.
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if (processing_repeat_count) {
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return;
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}
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if (event->pressed) {
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registered_record = (keyrecord_t){
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# ifndef NO_ACTION_TAPPING
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.tap.interrupted = false,
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.tap.count = 0,
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# endif
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.keycode = get_alt_repeat_key_keycode(),
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};
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}
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// Early return if there is no alternate key defined.
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if (!registered_record.keycode) {
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return;
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}
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if (event->pressed) {
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update_last_repeat_count(-1);
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registered_repeat_count = last_repeat_count;
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}
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// Generate a keyrecord and plumb it into the event pipeline.
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registered_record.event = *event;
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processing_repeat_count = registered_repeat_count;
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process_record(®istered_record);
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processing_repeat_count = 0;
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}
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// Default implementation of get_alt_repeat_key_keycode_user().
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__attribute__((weak)) uint16_t get_alt_repeat_key_keycode_user(uint16_t keycode, uint8_t mods) {
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return KC_TRANSPARENT;
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}
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#endif // NO_ALT_REPEAT_KEY
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