JS: Support enum properties

modules/js/src/core_bindings.cpp

@@ -78,6 +78,12 @@ using namespace dnn;
 
 namespace binding_utils
 {
+    template<typename classT, typename enumT>
+    static inline typename std::underlying_type<enumT>::type classT::* underlying_ptr(enumT classT::* enum_ptr)
+    {
+        return reinterpret_cast<typename std::underlying_type<enumT>::type classT::*>(enum_ptr);
+    }
+
     template<typename T>
     emscripten::val matData(const cv::Mat& mat)
     {

modules/js/src/embindgen.py

@@ -856,7 +856,8 @@ class JSWrapperGenerator(object):
 
             # Generate bindings for properties
             for property in class_info.props:
-                class_bindings.append(class_property_template.substitute(js_name=property.name, cpp_name='::'.join(
+                _class_property = class_property_enum_template if property.tp in type_dict else class_property_template
+                class_bindings.append(_class_property.substitute(js_name=property.name, cpp_name='::'.join(
                     [class_info.cname, property.name])))
 
             dv = ''

modules/js/src/templates.py

@@ -153,6 +153,9 @@ overload_class_static_function_template = Template("""
 class_property_template = Template("""
         .property("$js_name", &$cpp_name)""")
 
+class_property_enum_template = Template("""
+        .property("$js_name", binding_utils::underlying_ptr(&$cpp_name))""")
+
 ctr_template = Template("""
         .constructor(select_overload<$ret($args)$const>(&$cpp_name)$optional)""")