[studio] Add combobox that will take string views

src/olympic/studio/modlib/include/studio/imguiutil.hpp

@@ -225,6 +225,18 @@ PopupResponse PopupControlsOkCancel(
 [[nodiscard]]
 bool BeginPopup(turbine::Context &ctx, ox::CStringViewCR popupName, bool &show, ImVec2 const&sz = {285, 0});
 
+/**
+ *
+ * @param lbl
+ * @param list
+ * @param selectedIdx
+ * @return true if new value selected, false otherwise
+ */
+bool ComboBox(
+		ox::CStringView lbl,
+		ox::SpanView<ox::CStringView> list,
+		size_t &selectedIdx) noexcept;
+
 /**
  *
  * @param lbl

src/olympic/studio/modlib/src/imguiutil.cpp

@@ -90,6 +90,25 @@ bool BeginPopup(turbine::Context &ctx, ox::CStringViewCR popupName, bool &show,
 	return ImGui::BeginPopupModal(popupName.c_str(), &show, modalFlags);
 }
 
+bool ComboBox(
+		ox::CStringView lbl,
+		ox::SpanView<ox::CStringView> list,
+		size_t &selectedIdx) noexcept {
+	bool out{};
+	auto const first = selectedIdx < list.size() ? list[selectedIdx].c_str() : "";
+	if (ImGui::BeginCombo(lbl.c_str(), first, 0)) {
+		for (auto i = 0u; i < list.size(); ++i) {
+			const auto selected = (selectedIdx == i);
+			if (ImGui::Selectable(list[i].c_str(), selected) && selectedIdx != i) {
+				selectedIdx = i;
+				out = true;
+			}
+		}
+		ImGui::EndCombo();
+	}
+	return out;
+}
+
 bool ComboBox(
 		ox::CStringView lbl,
 		ox::Span<const ox::String> list,