docs(others):update obj_property

docs/others/obj_property.rst

@@ -45,7 +45,11 @@ Two APIs are provided to get/set widget properties. It can be enabled by setting
             int32_t num;                /**< Number integer number (opacity, enums, booleans or "normal" numbers)*/
             const void * ptr;           /**< Constant pointers  (font, cone text, etc)*/
             lv_color_t color;           /**< Colors*/
-            lv_style_value_t _style;    /**< A place holder for style value which is same as property value.*/
+            lv_value_precise_t precise; /**< float or int for precise value*/
+            struct {
+                lv_style_value_t style; /**< Make sure it's the first element in struct. */
+                uint32_t selector;      /**< Style selector, lv_part_t | lv_state_t */
+            };
         };
     } lv_property_t;
 
@@ -68,7 +72,11 @@ Two APIs are provided to get/set widget properties. It can be enabled by setting
             int32_t num;                /**< 整数数字（不透明度，枚举，布尔值或“正常”数字）*/
             const void * ptr;           /**< 常量指针（字体，文本等）*/
             lv_color_t color;           /**< 颜色*/
-            lv_style_value_t _style;    /**< 样式值的占位符，与属性值相同。*/
+            lv_value_precise_t precise; /**< float或int表示精确值*/
+            struct {
+                lv_style_value_t style; /**< 确保它是结构中的第一个元素。 */
+                uint32_t selector;      /**< 样式选择器, lv_part_t | lv_state_t */
+            };
         };
     } lv_property_t;