feat(xml): add support for scroll snapping

src/others/xml/lv_xml_base_types.c

@@ -153,6 +153,17 @@ lv_text_decor_t lv_xml_text_decor_to_enum(const char * txt)
     return 0; /*Return 0 in lack of a better option. */
 }
 
+lv_scroll_snap_t lv_xml_scroll_snap_to_enum(const char * txt)
+{
+    if(lv_streq("none", txt)) return LV_SCROLL_SNAP_NONE;
+    if(lv_streq("start", txt)) return LV_SCROLL_SNAP_START;
+    if(lv_streq("center", txt)) return LV_SCROLL_SNAP_CENTER;
+    if(lv_streq("end", txt)) return LV_SCROLL_SNAP_END;
+
+    LV_LOG_WARN("%s is an unknown value for scroll_snap", txt);
+    return 0; /*Return 0 in lack of a better option. */
+}
+
 lv_flex_flow_t lv_xml_flex_flow_to_enum(const char * txt)
 {
     if(lv_streq("column", txt)) return LV_FLEX_FLOW_COLUMN;

src/others/xml/lv_xml_base_types.h

@@ -90,6 +90,13 @@ lv_text_align_t lv_xml_text_align_to_enum(const char * txt);
  */
 lv_text_decor_t lv_xml_text_decor_to_enum(const char * txt);
 
+/**
+ * Convert a scroll snap string to enum
+ * @param txt       e.g. "start"
+ * @return          the related enum, e.g. `LV_SCROLL_SNAP_START`
+ */
+lv_scroll_snap_t lv_xml_scroll_snap_to_enum(const char * txt);
+
 /**
  * Convert a flex flow string to enum
  * @param txt       e.g. "row_wrap"

src/others/xml/parsers/lv_xml_obj_parser.c

@@ -88,6 +88,8 @@ void lv_xml_obj_apply(lv_xml_parser_state_t * state, const char ** attrs)
         else if(lv_streq("flex_flow", name)) lv_obj_set_flex_flow(item, lv_xml_flex_flow_to_enum(value));
         else if(lv_streq("flex_grow", name)) lv_obj_set_flex_grow(item, lv_xml_atoi(value));
         else if(lv_streq("ext_click_area", name)) lv_obj_set_ext_click_area(item, lv_xml_atoi(value));
+        else if(lv_streq("scroll_snap_x", name)) lv_obj_set_scroll_snap_x(item, lv_xml_scroll_snap_to_enum(value));
+        else if(lv_streq("scroll_snap_y", name)) lv_obj_set_scroll_snap_y(item, lv_xml_scroll_snap_to_enum(value));
 
         else if(lv_streq("hidden", name))               lv_obj_set_flag(item, LV_OBJ_FLAG_HIDDEN, lv_xml_to_bool(value));
         else if(lv_streq("clickable", name))            lv_obj_set_flag(item, LV_OBJ_FLAG_CLICKABLE, lv_xml_to_bool(value));

xmls/globals.xml

@@ -186,6 +186,13 @@
             <enum name="full"    	help=""/>
     </enumdef>
 
+    <enumdef name="lv_scroll_snap">
+            <enum name="none"  		help=""/>
+            <enum name="start"    	help=""/>
+            <enum name="end"    	help=""/>
+            <enum name="center"    	help=""/>
+    </enumdef>
+
     <enumdef name="lv_screen_load_anim">
         <enum name="none" help=""/>
         <enum name="over_left" help=""/>

xmls/lv_obj.xml

@@ -184,6 +184,8 @@ Example
 	    <prop name="align" type="enum:lv_align"/>
 
         <prop name="ext_click_area" type="int"/>
+        <prop name="scroll_snap_x" type="enum:lv_scroll_snap"/>
+        <prop name="scroll_snap_y" type="enum:lv_scroll_snap"/>
 
         <prop name="style_x" type="coords"/>
         <prop name="style_y" type="coords"/>