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[Docs] Add Tap Dance example to the docs (#5326)

* add a tapdance example for creating advanced mod-tap and layer-tap keys

* add optional curly braces to match QMK conventions

* change example to use `register_code16()` and tapdance keycodes more closely matching QMK variants
This commit is contained in:
Dusty Pomerleau 2019-03-08 07:30:02 +11:00 committed by Drashna Jaelre
parent ba11a1c807
commit 6d4f6f3f49
3 changed files with 98 additions and 1 deletions

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@ -314,3 +314,86 @@ qk_tap_dance_action_t tap_dance_actions[] = {
And then simply use `TD(X_CTL)` anywhere in your keymap.
If you want to implement this in your userspace, then you may want to check out how [DanielGGordon](https://github.com/qmk/qmk_firmware/tree/master/users/gordon) has implemented this in their userspace.
### Example 5: Using tap dance for advanced mod-tap and layer-tap keys
Tap dance can be used to emulate `MT()` and `LT()` behavior when the tapped code is not a basic keycode. This is useful to send tapped keycodes that normally require `Shift`, such as parentheses or curly braces—or other modified keycodes, such as `Control + X`.
Below your layers and custom keycodes, add the following:
```c
// tapdance keycodes
enum td_keycodes {
ALT_LP // Our example key: `LALT` when held, `(` when tapped. Add additional keycodes for each tapdance.
};
// define a type containing as many tapdance states as you need
typedef enum {
SINGLE_TAP,
SINGLE_HOLD,
DOUBLE_SINGLE_TAP
} td_state_t;
// create a global instance of the tapdance state type
static td_state_t td_state;
// declare your tapdance functions:
// function to determine the current tapdance state
int cur_dance (qk_tap_dance_state_t *state);
// `finished` and `reset` functions for each tapdance keycode
void altlp_finished (qk_tap_dance_state_t *state, void *user_data);
void altlp_reset (qk_tap_dance_state_t *state, void *user_data);
```
Below your `LAYOUT`, define each of the tapdance functions:
```c
// determine the tapdance state to return
int cur_dance (qk_tap_dance_state_t *state) {
if (state->count == 1) {
if (state->interrupted || !state->pressed) { return SINGLE_TAP; }
else { return SINGLE_HOLD; }
}
if (state->count == 2) { return DOUBLE_SINGLE_TAP; }
else { return 3; } // any number higher than the maximum state value you return above
}
// handle the possible states for each tapdance keycode you define:
void altlp_finished (qk_tap_dance_state_t *state, void *user_data) {
td_state = cur_dance(state);
switch (td_state) {
case SINGLE_TAP:
register_code16(KC_LPRN);
break;
case SINGLE_HOLD:
register_mods(MOD_BIT(KC_LALT)); // for a layer-tap key, use `layer_on(_MY_LAYER)` here
break;
case DOUBLE_SINGLE_TAP: // allow nesting of 2 parens `((` within tapping term
tap_code16(KC_LPRN);
register_code16(KC_LPRN);
}
}
void altlp_reset (qk_tap_dance_state_t *state, void *user_data) {
switch (td_state) {
case SINGLE_TAP:
unregister_code16(KC_LPRN);
break;
case SINGLE_HOLD:
unregister_mods(MOD_BIT(KC_LALT)); // for a layer-tap key, use `layer_off(_MY_LAYER)` here
break;
case DOUBLE_SINGLE_TAP:
unregister_code16(KC_LPRN);
}
}
// define `ACTION_TAP_DANCE_FN_ADVANCED()` for each tapdance keycode, passing in `finished` and `reset` functions
qk_tap_dance_action_t tap_dance_actions[] = {
[ALT_LP] = ACTION_TAP_DANCE_FN_ADVANCED(NULL, altlp_finished, altlp_reset)
};
```
Wrap each tapdance keycode in `TD()` when including it in your keymap, e.g. `TD(ALT_LP)`.