Shift+Backspace to Delete

tacahiroy · Jan 10, 2024 · b29f163 · b29f163
1 parent d532b92
commit b29f163
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Showing 3 changed files with 48 additions and 7 deletions.
diff --git a/keyboards/hineybush/h60/keymaps/tacahiroy/keymap.c b/keyboards/hineybush/h60/keymaps/tacahiroy/keymap.c
@@ -44,10 +44,10 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   ),
 
   [_LOWER] = LAYOUT_60_tsangan_hhkb(
-    W_IME,   KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_MUTE, KC_MPLY,
-    _______,   _______, XX_TAB,  _______, _______, _______, TM_SLST, TM_PREV, TM_WLST, TM_NEXT, KC_PIPE, KC_VOLD, KC_VOLU, KC_DEL,
-    _______, _______, MOUS,    W_SNIP, KC_F5,   KC_F3,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, TM_SSH,  _______, _______,
-    _______, _______, CUT,     COPY2,   PASTE2,  TOP,     BOTTOM,  KC_HOME, KC_END,  _______, TM_LASS, _______, _______,
+    W_IME,   KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  _______, _______,
+    _______, _______, XX_TAB,  _______, _______, _______, TM_SLST, TM_PREV, TM_WLST, TM_NEXT, KC_PIPE, KC_VOLD, KC_VOLU, KC_MPLY,
+    _______, _______, MOUS,    W_SNIP,  KC_F5,   KC_F3,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, TM_SSH,  TM_LASS, _______,
+    _______, _______, CUT,     COPY2,   PASTE2,  TOP,     BOTTOM,  KC_HOME, KC_END,  _______, _______, _______, _______,
     _______, _______, _______,                   JP_HENK,                            _______, _______, _______ 
   ),
 

diff --git a/users/tacahiroy/tacahiroy.c b/users/tacahiroy/tacahiroy.c
@@ -15,6 +15,12 @@
  */
 #include "tacahiroy.h"
 
+// Initialize variable holding the binary
+// representation of active modifiers.
+uint8_t mod_state;
+
+static bool lower_pressed = false;
+static bool raise_pressed = false;
 
 void toggle_ime(bool is_on) {
     if (is_on) {
@@ -26,9 +32,6 @@ void toggle_ime(bool is_on) {
     }
 }
 
-static bool lower_pressed = false;
-static bool raise_pressed = false;
-
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
   switch (keycode) {
     case COLEMAK:
@@ -123,6 +126,12 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
       }
       return false;
 
+    // https://docs.qmk.fm/#/feature_advanced_keycodes?id=shift-backspace-for-delete
+    case KC_BSPC:
+      // Store the current modifier state in the variable for later reference
+      mod_state = get_mods();
+      return shift_backspace_for_delete(record);
+
     default:
       if (record->event.pressed) {
         lower_pressed = false;
@@ -132,3 +141,34 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
   }
   return true;
 }
+
+bool shift_backspace_for_delete(keyrecord_t *record) {
+    // Initialize a boolean variable that keeps track
+    // of the delete key status: registered or not?
+    static bool delkey_registered;
+    if (record->event.pressed) {
+        // Detect the activation of either shift keys
+        if (mod_state & MOD_MASK_SHIFT) {
+            // First temporarily canceling both shifts so that
+            // shift isn't applied to the KC_DEL keycode
+            del_mods(MOD_MASK_SHIFT);
+            register_code(KC_DEL);
+            // Update the boolean variable to reflect the status of KC_DEL
+            delkey_registered = true;
+            // Reapplying modifier state so that the held shift key(s)
+            // still work even after having tapped the Backspace/Delete key.
+            set_mods(mod_state);
+            return false;
+        }
+    } else { // on release of KC_BSPC
+        // In case KC_DEL is still being sent even after the release of KC_BSPC
+        if (delkey_registered) {
+            unregister_code(KC_DEL);
+            delkey_registered = false;
+            return false;
+        }
+    }
+
+    // Let QMK process the KC_BSPC keycode as usual outside of shift
+    return true;
+}
diff --git a/users/tacahiroy/tacahiroy.h b/users/tacahiroy/tacahiroy.h
@@ -46,6 +46,7 @@ enum tacahiroy_keycodes {
 };
 
 void toggle_ime(bool is_on);
+bool shift_backspace_for_delete(keyrecord_t *record);
 
 #define LOWER LT(_LOWER, JP_MHEN)
 #define RAISE LT(_RAISE, JP_HENK)