keys: allow inverting positioning wheel (fixes #4748)

src/config/keys.c

@@ -438,6 +438,34 @@ static int vlc_AddMapping (void **map, uint32_t keycode, vlc_action_t action)
     return 0;
 }
 
+static void vlc_AddWheelMapping (void **map, uint32_t kmore, uint32_t kless,
+                                 int mode)
+{
+    vlc_action_t amore = ACTIONID_NONE, aless = ACTIONID_NONE;
+
+    switch (mode)
+    {
+        case 0: /* volume up/down */
+            amore = ACTIONID_VOL_UP;
+            aless = ACTIONID_VOL_DOWN;
+            break;
+        case 2: /* position latter/earlier */
+            amore = ACTIONID_JUMP_FORWARD_EXTRASHORT;
+            aless = ACTIONID_JUMP_BACKWARD_EXTRASHORT;
+            break;
+        case 3: /* position earlier/latter */
+            amore = ACTIONID_JUMP_BACKWARD_EXTRASHORT;
+            aless = ACTIONID_JUMP_FORWARD_EXTRASHORT;
+            break;
+    }
+
+    if (amore != ACTIONID_NONE)
+        vlc_AddMapping (map, kmore, amore);
+    if (aless != ACTIONID_NONE)
+        vlc_AddMapping (map, kless, aless);
+}
+
+
 /**
  * Sets up all key mappings for a given action.
  * \param map tree (of struct mapping entries) to write mappings to
@@ -511,28 +539,10 @@ struct vlc_actions *vlc_InitActions (libvlc_int_t *libvlc)
     keys->psz_action = NULL;
 
     /* Initialize mouse wheel events */
-    int xmode = var_InheritInteger (obj, "hotkeys-x-wheel-mode");
-    if (xmode < 2)
-    {
-        vlc_AddMapping (&as->map, KEY_MOUSEWHEELLEFT,
-                        xmode ? ACTIONID_JUMP_BACKWARD_EXTRASHORT
-                              : ACTIONID_VOL_DOWN);
-        vlc_AddMapping (&as->map, KEY_MOUSEWHEELRIGHT,
-                        xmode ? ACTIONID_JUMP_FORWARD_EXTRASHORT
-                              : ACTIONID_VOL_UP);
-    }
-
-    int ymode = var_InheritInteger (obj, "hotkeys-y-wheel-mode");
-    if (ymode < 2)
-    {
-        vlc_AddMapping (&as->map, KEY_MOUSEWHEELDOWN,
-                        ymode ? ACTIONID_JUMP_BACKWARD_EXTRASHORT
-                              : ACTIONID_VOL_DOWN);
-        vlc_AddMapping (&as->map, KEY_MOUSEWHEELUP,
-                        ymode ? ACTIONID_JUMP_FORWARD_EXTRASHORT
-                              : ACTIONID_VOL_UP);
-    }
-
+    vlc_AddWheelMapping (&as->map, KEY_MOUSEWHEELRIGHT, KEY_MOUSEWHEELLEFT,
+                         var_InheritInteger (obj, "hotkeys-x-wheel-mode"));
+    vlc_AddWheelMapping (&as->map, KEY_MOUSEWHEELUP, KEY_MOUSEWHEELDOWN,
+                         var_InheritInteger (obj, "hotkeys-y-wheel-mode"));
 
     libvlc->p_hotkeys = as->keys;
     var_AddCallback (obj, "key-pressed", vlc_key_to_action, &as->map);

src/libvlc-module.c

@@ -1172,9 +1172,11 @@ static const char *const ppsz_prefres[] = {
 #define HOTKEY_CAT_LONGTEXT N_( "These settings are the global VLC key " \
     "bindings, known as \"hotkeys\"." )
 
-static const int mouse_wheel_values[] = { 2, 0, 1 };
-static const char *const mouse_wheel_texts[] =
-    { N_("Ignore"), N_("Volume Control"), N_("Position Control") };
+static const int mouse_wheel_values[] = { -1, 0, 2, 3, };
+static const char *const mouse_wheel_texts[] = {
+    N_("Ignore"), N_("Volume control"),
+    N_("Position control"), N_("Position control reversed"),
+};
 
 #define MOUSE_Y_WHEEL_MODE_TEXT N_("Mouse wheel vertical axis control")
 #define MOUSE_Y_WHEEL_MODE_LONGTEXT N_( \
@@ -2094,7 +2096,7 @@ vlc_module_begin ()
     add_integer( "hotkeys-y-wheel-mode", 0, MOUSE_Y_WHEEL_MODE_TEXT,
                  MOUSE_Y_WHEEL_MODE_LONGTEXT, false )
         change_integer_list( mouse_wheel_values, mouse_wheel_texts )
-    add_integer( "hotkeys-x-wheel-mode", 1, MOUSE_X_WHEEL_MODE_TEXT,
+    add_integer( "hotkeys-x-wheel-mode", 2, MOUSE_X_WHEEL_MODE_TEXT,
                  MOUSE_X_WHEEL_MODE_LONGTEXT, false )
         change_integer_list( mouse_wheel_values, mouse_wheel_texts )
     add_obsolete_integer( "hotkeys-mousewheel-mode" ) /* since 3.0.0 */