333fred layout update (#1971)

* Set up tap dance for layers on the lower button.

* Refactored code to share in the users directory between my two keyboard layouts.

* Small keyboard layout change.

* Updated documentation on oneshot usage in macros/tap dance.

users/333fred/333fred.c

@@ -0,0 +1,63 @@
+#include "333fred.h"
+#include "quantum.h"
+#include "action.h"
+
+typedef enum {
+    SINGLE_TAP, SINGLE_HOLD, DOUBLE
+} tap_dance_state_enum;
+
+static tap_dance_state_enum tap_dance_state;
+static bool tap_dance_active = false;
+
+void tap_dance_layer_finished(qk_tap_dance_state_t *state, void *user_data) {
+    // Determine the current state
+    if (state->count == 1) {
+        if (state->interrupted || state->pressed == 0) tap_dance_state = SINGLE_TAP;
+        else tap_dance_state = SINGLE_HOLD;
+    } else {
+        // Handle any number of other taps as a VIM movement hold
+        tap_dance_state = DOUBLE;
+    }
+
+    switch (tap_dance_state) {
+        case SINGLE_TAP:
+            if (tap_dance_active) {
+                reset_oneshot_layer();
+                tap_dance_active = false;
+            } else {
+                set_oneshot_layer(SYMB, ONESHOT_START);
+                tap_dance_active = true;
+            }
+            break;
+        case SINGLE_HOLD:
+            layer_on(SYMB);
+            break;
+        case DOUBLE:
+            layer_on(VIM);
+    }
+}
+
+
+void tap_dance_layer_reset(qk_tap_dance_state_t *state, void *user_data) {
+    switch(tap_dance_state) {
+        case SINGLE_TAP:
+            clear_oneshot_layer_state(ONESHOT_PRESSED);
+            break;
+        case SINGLE_HOLD:
+            layer_off(SYMB);
+            break;
+        case DOUBLE:
+            layer_off(VIM);
+            break;
+    }
+}
+
+qk_tap_dance_action_t tap_dance_actions[] = {
+    [TD_SYM_VIM] = ACTION_TAP_DANCE_FN_ADVANCED(NULL, tap_dance_layer_finished, tap_dance_layer_reset)
+};
+
+void tap_dance_process_record(uint16_t keycode) {
+    if (tap_dance_state == SINGLE_TAP && keycode != TD(TD_SYM_VIM)) {
+        tap_dance_active = false;
+    }
+}

users/333fred/333fred.h

@@ -0,0 +1,22 @@
+#ifndef FRED_333
+#define FRED_333
+
+#include "quantum.h"
+
+#define BASE 0
+#define CODE 1 // code layer
+#define SYMB 2
+#define MDIA 3 // media keys
+#define VIM  4
+#define GAME 5
+
+// Tap dance config shared between my keyboards
+enum tap_dance_declarations {
+    TD_SYM_VIM = 0
+};
+
+void tap_dance_layer_finished(qk_tap_dance_state_t*, void*);
+void tap_dance_layer_reset(qk_tap_dance_state_t*, void*);
+void tap_dance_process_record(uint16_t);
+
+#endif

users/333fred/rules.mk

@@ -0,0 +1,2 @@
+
+SRC += 333fred.c