Add luavgl_to_style method

lib/luavgl/src/luavgl.h

@@ -157,6 +157,11 @@ LUALIB_API int luavgl_obj_getuserdatauv(lua_State *L, int idx);
  */
 LUALIB_API lv_obj_t *luavgl_to_obj(lua_State *L, int idx);
 
+/**
+ * @brief Get lvgl style from stack
+ */
+LUALIB_API lv_style_t *luavgl_to_style(lua_State *L, int idx);
+
 /**
  * @brief Convert value to integer
  *

lib/luavgl/src/util.c

@@ -272,6 +272,17 @@ LUALIB_API lv_obj_t *luavgl_to_obj(lua_State *L, int idx)
   return lobj->obj;
 }
 
+LUALIB_API lv_style_t *luavgl_to_style(lua_State *L, int idx)
+{
+  luavgl_style_t *lsty = luavgl_check_style(L, idx);
+  if (lsty == NULL) {
+    luaL_argerror(L, idx, "expect lua lvgl style, got null");
+    return NULL;
+  }
+
+  return &lsty->style;
+}
+
 LUALIB_API int luavgl_tointeger(lua_State *L, int idx)
 {
   int v = 0;