qmk-firmware/users/issmirnov/tap_tog.c

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#include QMK_KEYBOARD_H
#include "tap_tog.h"
bool tap_tog_layer_other_key_pressed = false;
bool tap_tog_layer_toggled_on = false;
uint8_t tap_tog_count = 0;
void process_tap_tog(uint8_t layer, keyrecord_t *record) {
tap_tog_count++;
// press
if (record->event.pressed) {
// TTL has already been pressed and we are toggled into that layer
// so now we need to leave
if(tap_tog_layer_toggled_on) {
layer_clear();
tap_tog_layer_toggled_on = false;
}
// this means we're in our default layer
// so switch the layer immediately
// whether we'll switch back when it's released depends on if a button gets pressed while this is held down
else {
// switch layer
layer_on(layer);
tap_tog_layer_other_key_pressed = false; // if this becomes true before it gets released, it will act as a held modifier
}
}
// release
else {
// if it was used as a held modifier (like traditional shift)
if(tap_tog_layer_other_key_pressed) {
// switch layer back
layer_clear();
}
// if it was used as a toggle button
else {
// next time, it will turn layer off
tap_tog_layer_toggled_on = true;
// If it's been tapped twice, reset the toggle flag.
// Otherwise, we get stuck oscillating between this code block and the
// pressed && TTL_toggled_on block.
if (tap_tog_count >= 4 ) {
tap_tog_count = 0;
tap_tog_layer_toggled_on = false;
}
}
}
}