add enums to property drawer

sources/enduro2d/core/dbgui_impl/dbgui.hpp

@@ -52,6 +52,38 @@ namespace e2d::imgex
     bool show_input_text(str_view label, str* value);
     bool show_input_text_multiline(str_view label, str* value);
 
+    template < typename E >
+    bool show_enum(str_view label, E* value) {
+        char* label_cstr = static_cast<char*>(E2D_CLEAR_ALLOCA(label.size() + 1));
+        std::memcpy(label_cstr, label.data(), label.size());
+
+        std::optional<str_view> preview = enum_hpp::to_string(*value);
+        char* preview_cstr = static_cast<char*>(E2D_CLEAR_ALLOCA((preview ? preview->size() : 0) + 1));
+        if ( preview ) {
+            std::memcpy(preview_cstr, preview->data(), preview->size());
+        }
+
+        if ( ImGui::BeginCombo(label_cstr, preview_cstr) ) {
+            E2D_DEFER([](){ ImGui::EndCombo(); });
+
+            for ( std::size_t i = 0; i < enum_hpp::size<E>(); ++i ) {
+                str_view item_name = enum_hpp::names<E>()[i];
+                char* item_name_cstr = static_cast<char*>(E2D_CLEAR_ALLOCA(item_name.size() + 1));
+                std::memcpy(item_name_cstr, item_name.data(), item_name.size());
+
+                bool selected = *value == enum_hpp::values<E>()[i];
+                if ( ImGui::Selectable(item_name_cstr, selected) ) {
+                    *value = enum_hpp::values<E>()[i];
+                    return true;
+                } else if ( selected ) {
+                    ImGui::SetItemDefaultFocus();
+                }
+            }
+        }
+
+        return false;
+    }
+
     template < typename... Args >
     void show_text(str_view text, Args&&... args) {
         if constexpr ( sizeof... (Args) ) {

sources/enduro2d/high/widgets/property_drawer.cpp

@@ -78,8 +78,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<v2f>& p) const {
-        v2f v = *p;
+        if ( v2f v = *p; (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = v;
             return true;
         }
@@ -135,8 +134,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<v3f>& p) const {
-        v3f v = *p;
+        if ( v3f v = *p; (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = v;
             return true;
         }
@@ -192,8 +190,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<v4f>& p) const {
-        v4f v = *p;
+        if ( v4f v = *p; (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = v;
             return true;
         }
@@ -247,8 +244,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<str>& p) const {
-        str v = *p;
+        if ( str v = *p; (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = std::move(v);
             return true;
         }
@@ -283,8 +279,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<degf>& p) const {
-        degf v = *p;
+        if ( degf v = *p; (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = v;
             return true;
         }
@@ -340,8 +335,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<radf>& p) const {
-        radf v = *p;
+        if ( radf v = *p; (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = v;
             return true;
         }
@@ -397,8 +391,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<color>& p) const {
-        color v = *p;
+        if ( color v = *p; (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = v;
             return true;
         }
@@ -410,8 +403,7 @@ namespace e2d::dbgui_widgets
     //
 
     bool property_drawer::operator()(str_view l, color32& p) const {
-        color v = color(p);
+        if ( color v = color(p); (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = color32(v);
             return true;
         }
@@ -419,8 +411,7 @@ namespace e2d::dbgui_widgets
     }
 
     bool property_drawer::operator()(str_view l, property<color32>& p) const {
-        color v = color(*p);
+        if ( color v = color(*p); (*this)(l, v) ) {
-        if ( (*this)(l, v) ) {
             p = color32(v);
             return true;
         }

sources/enduro2d/high/widgets/property_drawer.hpp

@@ -55,5 +55,15 @@ namespace e2d::dbgui_widgets
 
         bool operator()(str_view l, color32& p) const;
         bool operator()(str_view l, property<color32>& p) const;
+
+        template < typename E >
+        std::enable_if_t<std::is_enum_v<E>, bool>
+        operator()(str_view l, property<E>& p) const {
+            if ( E v = *p; imgex::show_enum(l, &v) ) {
+                p = v;
+                return true;
+            }
+            return false;
+        }
     };
 }