[keel,studio] Add support for New Item templates

deps/ox/src/ox/std/anyptr.hpp

@@ -15,16 +15,20 @@
 
 namespace ox {
 
-class AnyPtr {
+namespace detail {
+
+template<bool unique>
+class AnyPtrT {
 	private:
 		struct WrapBase {
 			virtual constexpr ~WrapBase() = default;
 			virtual constexpr WrapBase *copyTo(ox::Span<char> s) noexcept = 0;
 			virtual constexpr operator bool() const noexcept = 0;
+			virtual void free() noexcept = 0;
 		};
 
 		template<typename T>
-		struct Wrap: public WrapBase {
+		struct Wrap final: WrapBase {
 			T *data{};
 			constexpr Wrap(T *pData) noexcept: data(pData) {
 			}
@@ -39,16 +43,20 @@ class AnyPtr {
 			constexpr operator bool() const noexcept override {
 				return data != nullptr;
 			}
+			constexpr void free() noexcept override {
+				ox::safeDelete(data);
+				data = {};
+			}
 		};
 
 		WrapBase *m_wrapPtr{};
 		ox::Array<char, sizeof(Wrap<void*>)> m_wrapData;
 
 	public:
-		constexpr AnyPtr() noexcept = default;
+		constexpr AnyPtrT() noexcept = default;
 
 		template<typename T>
-		constexpr AnyPtr(T *ptr) noexcept {
+		constexpr AnyPtrT(T *ptr) noexcept {
 			if (std::is_constant_evaluated()) {
 				m_wrapPtr = new Wrap(ptr);
 			} else {
@@ -56,22 +64,39 @@ class AnyPtr {
 			}
 		}
 
-		constexpr AnyPtr(AnyPtr const&other) noexcept {
+		constexpr AnyPtrT(AnyPtrT const&other) noexcept {
 			if (other) {
 				m_wrapPtr = other.m_wrapPtr->copyTo(m_wrapData);
 			}
 		}
 
-		constexpr ~AnyPtr() noexcept {
+		constexpr AnyPtrT(AnyPtrT &&other) noexcept {
+			if (other) {
+				m_wrapPtr = other.m_wrapPtr->copyTo(m_wrapData);
+				if (std::is_constant_evaluated()) {
+					ox::safeDelete(m_wrapPtr);
+				}
+				other.m_wrapPtr = {};
+			}
+		}
+
+		constexpr ~AnyPtrT() noexcept {
+			if constexpr(unique) {
+				free();
+			}
 			if (std::is_constant_evaluated()) {
 				ox::safeDelete(m_wrapPtr);
 			}
 		}
 
 		template<typename T>
-		constexpr AnyPtr &operator=(T *ptr) noexcept {
-			if (std::is_constant_evaluated()) {
+		constexpr AnyPtrT &operator=(T *ptr) noexcept {
+			if constexpr(unique) {
+				free();
+			} else if (std::is_constant_evaluated()) {
 				ox::safeDelete(m_wrapPtr);
+			}
+			if (std::is_constant_evaluated()) {
 				m_wrapPtr = new Wrap(ptr);
 			} else {
 				m_wrapPtr = new(m_wrapData.data()) Wrap(ptr);
@@ -79,10 +104,14 @@ class AnyPtr {
 			return *this;
 		}
 
-		constexpr AnyPtr &operator=(AnyPtr const&ptr) noexcept {
+		constexpr AnyPtrT &operator=(AnyPtrT const&ptr) noexcept {
 			if (this != &ptr) {
-				if (ptr) {
+				if constexpr(unique) {
+					free();
+				} else if (std::is_constant_evaluated()) {
 					ox::safeDelete(m_wrapPtr);
+				}
+				if (ptr) {
 					m_wrapPtr = ptr.m_wrapPtr->copyTo(m_wrapData);
 				} else {
 					m_wrapPtr = nullptr;
@@ -91,10 +120,40 @@ class AnyPtr {
 			return *this;
 		}
 
+		constexpr AnyPtrT &operator=(AnyPtrT &&ptr) noexcept {
+			if (this != &ptr) {
+				if constexpr(unique) {
+					free();
+				} else if (std::is_constant_evaluated()) {
+					ox::safeDelete(m_wrapPtr);
+				}
+				if (ptr) {
+					m_wrapPtr = ptr.m_wrapPtr->copyTo(m_wrapData);
+					if (std::is_constant_evaluated()) {
+						ox::safeDelete(ptr.m_wrapPtr);
+						ptr.m_wrapPtr = nullptr;
+					}
+				} else {
+					m_wrapPtr = nullptr;
+				}
+			}
+			return *this;
+		}
+
 		constexpr operator bool() const noexcept {
 			return m_wrapPtr && *m_wrapPtr;
 		}
 
+		constexpr void free() noexcept {
+			if (m_wrapPtr) {
+				m_wrapPtr->free();
+			}
+			if (std::is_constant_evaluated()) {
+				ox::safeDelete(m_wrapPtr);
+			}
+			m_wrapPtr = nullptr;
+		}
+
 		template<typename T>
 		[[nodiscard]]
 		constexpr T *get() const noexcept {
@@ -104,6 +163,12 @@ class AnyPtr {
 			return dynamic_cast<Wrap<T>*>(m_wrapPtr)->data;
 #endif
 		}
+
 };
 
 }
+
+using AnyPtr = detail::AnyPtrT<false>;
+using UAnyPtr = detail::AnyPtrT<true>;
+
+}

src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditor-imgui.cpp

@@ -234,7 +234,7 @@ void TileSheetEditorImGui::draw(studio::StudioContext&) noexcept {
 		ImGui::BeginChild("SubSheets", {s_palViewWidth - 24, ySize / 2.f}, true);
 		{
 			static constexpr auto btnHeight = ig::BtnSz.y;
-			auto const btnSize = ImVec2{btnHeight, btnHeight};
+			auto constexpr btnSize = ImVec2{btnHeight, btnHeight};
 			if (ig::PushButton("+", btnSize)) {
 				auto insertOnIdx = m_model.activeSubSheetIdx();
 				auto const&parent = m_model.activeSubSheet();
@@ -258,7 +258,10 @@ void TileSheetEditorImGui::draw(studio::StudioContext&) noexcept {
 				m_exportMenu.show();
 			}
 			TileSheet::SubSheetIdx path;
-			static constexpr auto flags = ImGuiTableFlags_RowBg | ImGuiTableFlags_NoBordersInBody;
+			static constexpr auto flags =
+				ImGuiTableFlags_RowBg |
+                ImGuiTableFlags_NoBordersInBody |
+                ImGuiTableFlags_ScrollY;
             if (ImGui::BeginTable("Subsheets", 4, flags)) {
                 ImGui::TableSetupColumn("Subsheet", ImGuiTableColumnFlags_NoHide);
                 ImGui::TableSetupColumn("ID", ImGuiTableColumnFlags_WidthFixed, 25);
@@ -462,8 +465,12 @@ void TileSheetEditorImGui::drawPaletteMenu() noexcept {
 		}
 	}
 	// header
+	auto constexpr palTblFlags =
+		ImGuiTableFlags_RowBg |
+        ImGuiTableFlags_SizingStretchProp |
+        ImGuiTableFlags_ScrollY;
 	if (ImGui::BeginTable(
-			"PaletteTable", 4, ImGuiTableFlags_RowBg | ImGuiTableFlags_SizingStretchProp)) {
+			"PaletteTable", 4, palTblFlags)) {
 		ImGui::TableSetupColumn("Idx", 0, 0.6f);
 		ImGui::TableSetupColumn("", 0, 0.22f);
 		ImGui::TableSetupColumn("Name", 0, 3);

src/olympic/keel/include/keel/typeconv.hpp

@@ -20,6 +20,8 @@ class Wrap {
 		virtual ox::CStringView typeName() const noexcept = 0;
 		[[nodiscard]]
 		virtual int typeVersion() const noexcept = 0;
+		[[nodiscard]]
+		virtual ox::UAnyPtr moveToCopy() noexcept = 0;
 };
 
 template<typename T>
@@ -27,6 +29,11 @@ class WrapT: public Wrap {
 	public:
 		[[nodiscard]]
 		virtual constexpr T &obj() noexcept = 0;
+
+		ox::UAnyPtr moveToCopy() noexcept final {
+			return new T{std::move(obj())};
+		}
+
 };
 
 template<typename T>
@@ -184,7 +191,18 @@ ox::Result<ox::UPtr<Wrap>> convert(
 		auto &src,
 		ox::StringViewCR dstTypeName,
 		int const dstTypeVersion) noexcept {
-	return convert(ctx, WrapRef{src}, dstTypeName, dstTypeVersion);
+	WrapRef ref{src};
+	return convert(ctx, static_cast<Wrap&>(ref), dstTypeName, dstTypeVersion);
+}
+
+ox::Result<ox::UPtr<Wrap>> convert(
+		keel::Context &ctx,
+		auto const&src,
+		ox::StringViewCR dstTypeName,
+		int const dstTypeVersion) noexcept {
+	auto srcCpy = src;
+	WrapRef ref{srcCpy};
+	return convert(ctx, ref, dstTypeName, dstTypeVersion);
 }
 
 template<typename DstType>

src/olympic/studio/applib/src/newmenu.cpp

@@ -14,7 +14,7 @@ namespace studio {
 
 NewMenu::NewMenu() noexcept {
 	setTitle("New Item");
-	setSize({230, 140});
+	setSize({280, 180});
 }
 
 void NewMenu::open() noexcept {
@@ -33,7 +33,7 @@ bool NewMenu::isOpen() const noexcept {
 	return m_open;
 }
 
-void NewMenu::draw(studio::StudioContext &sctx) noexcept {
+void NewMenu::draw(StudioContext &sctx) noexcept {
 	switch (m_stage) {
 		case Stage::Opening:
 			ImGui::OpenPopup(title().c_str());
@@ -46,51 +46,73 @@ void NewMenu::draw(studio::StudioContext &sctx) noexcept {
 		case Stage::NewItemName:
 			drawNewItemName(sctx);
 			break;
+		case Stage::NewItemTemplate:
+			drawNewItemTemplate(sctx);
+			break;
 		case Stage::Closed:
 			m_open = false;
 			break;
 	}
 }
 
-void NewMenu::addItemMaker(ox::UniquePtr<studio::ItemMaker> &&im) noexcept {
+void NewMenu::addItemMaker(ox::UPtr<ItemMaker> &&im) noexcept {
 	m_types.emplace_back(std::move(im));
 	std::sort(
 			m_types.begin(), m_types.end(),
 			[](ox::UPtr<ItemMaker> const&im1, ox::UPtr<ItemMaker> const&im2) {
-				 return im1->typeName < im2->typeName;
+				 return im1->typeDisplayName() < im2->typeDisplayName();
 			});
 }
 
-void NewMenu::drawNewItemType(studio::StudioContext &sctx) noexcept {
-	drawWindow(sctx.tctx, &m_open, [this] {
-		auto const allocSz = m_types.size() * sizeof(char const*);
-		auto mem = ox_malloca(allocSz, char const*, nullptr);
-		auto items = ox::Span{mem.get(), allocSz};
-		for (auto i = 0u; auto const&im : m_types) {
-			items[i] = im->typeName.c_str();
-			++i;
+void NewMenu::installItemTemplate(ox::UPtr<ItemTemplate> &tmplt) noexcept {
+	for (auto const&im : m_types) {
+		if (im->installTemplate(tmplt)) {
+			break;
 		}
-		ImGui::ListBox("Item Type", &m_selectedType, items.data(), static_cast<int>(m_types.size()));
-		drawFirstPageButtons();
+	}
+}
+
+void NewMenu::drawNewItemType(StudioContext const&sctx) noexcept {
+	drawWindow(sctx.tctx, m_open, [this] {
+		ig::ListBox("Item Type", [&](size_t const i) -> ox::CStringView {
+			return m_types[i]->typeDisplayName();
+		}, m_types.size(), m_selectedType, {200, 100});
+		auto const&im = *m_types[m_selectedType];
+		drawFirstPageButtons(im.itemTemplates().size() == 1 ?
+			Stage::NewItemName : Stage::NewItemTemplate);
 	});
 }
 
-void NewMenu::drawNewItemName(studio::StudioContext &sctx) noexcept {
-	drawWindow(sctx.tctx, &m_open, [this, &sctx] {
-		auto const typeIdx = static_cast<std::size_t>(m_selectedType);
-		if (typeIdx < m_types.size()) {
+void NewMenu::drawNewItemTemplate(StudioContext &sctx) noexcept {
+	drawWindow(sctx.tctx, m_open, [this] {
+		auto const&templates =
+			m_types[m_selectedType]->itemTemplates();
+		ig::ListBox("Template", [&](size_t const i) -> ox::CStringView {
+			return templates[i]->name();
+		}, templates.size(), m_selectedTemplate, {200, 100});
+		drawButtons(Stage::NewItemType, Stage::NewItemName);
+	});
+}
+
+void NewMenu::drawNewItemName(StudioContext &sctx) noexcept {
+	drawWindow(sctx.tctx, m_open, [this, &sctx] {
+		if (m_selectedType < m_types.size()) {
 			ig::InputText("Name", m_itemName);
 		}
 		drawLastPageButtons(sctx);
 	});
 }
 
-void NewMenu::drawFirstPageButtons() noexcept {
-	ImGui::SetCursorPosX(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x - 130);
+void NewMenu::drawButtons(Stage const prev, Stage const next) noexcept {
+	ImGui::SetCursorPosX(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x - 198);
 	ImGui::SetCursorPosY(ImGui::GetCursorPosY() + ImGui::GetContentRegionAvail().y - 20);
-	auto const btnSz = ImVec2(60, 20);
+	constexpr ImVec2 btnSz{60, 20};
+	if (ImGui::Button("Back", btnSz)) {
+		m_stage = prev;
+	}
+	ImGui::SameLine();
 	if (ImGui::Button("Next", btnSz)) {
-		m_stage = Stage::NewItemName;
+		m_stage = next;
 	}
 	ImGui::SameLine();
 	if (ImGui::Button("Cancel", btnSz)) {
@@ -99,34 +121,50 @@ void NewMenu::drawFirstPageButtons() noexcept {
 	}
 }
 
-void NewMenu::drawLastPageButtons(studio::StudioContext &sctx) noexcept {
-	ImGui::SetCursorPosX(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x - 138);
+void NewMenu::drawFirstPageButtons(Stage const next) noexcept {
+	ImGui::SetCursorPosX(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x - 130);
 	ImGui::SetCursorPosY(ImGui::GetCursorPosY() + ImGui::GetContentRegionAvail().y - 20);
-	if (ImGui::Button("Back")) {
-		m_stage = Stage::NewItemType;
+	constexpr ImVec2 btnSz{60, 20};
+	if (ImGui::Button("Next", btnSz)) {
+		m_stage = next;
 	}
 	ImGui::SameLine();
-	if (ImGui::Button("Finish")) {
-		finish(sctx);
-	}
-	ImGui::SameLine();
-	if (ImGui::Button("Quit")) {
+	if (ImGui::Button("Cancel", btnSz)) {
 		ImGui::CloseCurrentPopup();
 		m_stage = Stage::Closed;
 	}
 }
 
-void NewMenu::finish(studio::StudioContext &sctx) noexcept {
+void NewMenu::drawLastPageButtons(StudioContext &sctx) noexcept {
+	ImGui::SetCursorPosX(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x - 198);
+	ImGui::SetCursorPosY(ImGui::GetCursorPosY() + ImGui::GetContentRegionAvail().y - 20);
+	constexpr ImVec2 btnSz{60, 20};
+	if (ImGui::Button("Back", btnSz)) {
+		m_stage = Stage::NewItemType;
+	}
+	ImGui::SameLine();
+	if (ImGui::Button("Finish", btnSz)) {
+		finish(sctx);
+	}
+	ImGui::SameLine();
+	if (ImGui::Button("Quit", btnSz)) {
+		ImGui::CloseCurrentPopup();
+		m_stage = Stage::Closed;
+	}
+}
+
+void NewMenu::finish(StudioContext &sctx) noexcept {
 	if (m_itemName.len() == 0) {
-		oxLogError(ox::Error(1, "New file error: no file name"));
+		oxLogError(ox::Error{1, "New file error: no file name"});
 		return;
 	}
-	auto const&typeMaker = *m_types[static_cast<std::size_t>(m_selectedType)];
-	if (sctx.project->exists(typeMaker.itemPath(m_itemName))) {
-		oxLogError(ox::Error(1, "New file error: file already exists"));
+	auto const&im = *m_types[static_cast<std::size_t>(m_selectedType)];
+	if (sctx.project->exists(im.itemPath(m_itemName))) {
+		oxLogError(ox::Error{1, "New file error: file already exists"});
 		return;
 	}
-	auto const [path, err] = typeMaker.write(sctx, m_itemName);
+	auto const [path, err] =
+		im.write(sctx, m_itemName, m_selectedTemplate);
 	if (err) {
 		oxLogError(err);
 		return;

src/olympic/studio/applib/src/newmenu.hpp

@@ -13,13 +13,14 @@
 
 namespace studio {
 
-class NewMenu: public studio::Popup {
+class NewMenu final: public Popup {
 	public:
 		enum class Stage {
 			Closed,
 			Opening,
 			NewItemType,
 			NewItemName,
+			NewItemTemplate,
 		};
 
 		// emits path parameter
@@ -29,8 +30,9 @@ class NewMenu: public studio::Popup {
 		Stage m_stage = Stage::Closed;
 		ox::String m_typeName;
 		ox::IString<255> m_itemName;
-		ox::Vector<ox::UniquePtr<studio::ItemMaker>> m_types;
-		int m_selectedType = 0;
+		ox::Vector<ox::UPtr<studio::ItemMaker>> m_types;
+		size_t m_selectedType = 0;
+		size_t m_selectedTemplate = 0;
 		bool m_open = false;
 
 	public:
@@ -43,37 +45,70 @@ class NewMenu: public studio::Popup {
 		[[nodiscard]]
 		bool isOpen() const noexcept override;
 
-		void draw(studio::StudioContext &sctx) noexcept override;
+		void draw(StudioContext &sctx) noexcept override;
 
 		template<typename T>
-		void addItemType(ox::String name, ox::String parentDir, ox::String fileExt, T itemTempl, ox::ClawFormat pFmt = ox::ClawFormat::Metal) noexcept;
+		void addItemType(
+			ox::StringParam displayName,
+			ox::StringParam parentDir,
+			ox::StringParam fileExt,
+			T itemTempl,
+			ox::ClawFormat pFmt = ox::ClawFormat::Metal) noexcept;
 
 		template<typename T>
-		void addItemType(ox::String name, ox::String parentDir, ox::String fileExt, ox::ClawFormat pFmt = ox::ClawFormat::Metal) noexcept;
+		void addItemType(
+			ox::StringParam displayName,
+			ox::StringParam parentDir,
+			ox::StringParam fileExt,
+			ox::ClawFormat pFmt = ox::ClawFormat::Metal) noexcept;
 
-		void addItemMaker(ox::UniquePtr<studio::ItemMaker> &&im) noexcept;
+		void addItemMaker(ox::UPtr<ItemMaker> &&im) noexcept;
+
+		void installItemTemplate(ox::UPtr<ItemTemplate> &tmplt) noexcept;
 
 	private:
-		void drawNewItemType(studio::StudioContext &sctx) noexcept;
+		void drawNewItemType(StudioContext const&sctx) noexcept;
 
-		void drawNewItemName(studio::StudioContext &sctx) noexcept;
+		void drawNewItemName(StudioContext &sctx) noexcept;
 
-		void drawFirstPageButtons() noexcept;
+		void drawNewItemTemplate(StudioContext &sctx) noexcept;
 
-		void drawLastPageButtons(studio::StudioContext &sctx) noexcept;
+		void drawButtons(Stage prev, Stage next) noexcept;
 
-		void finish(studio::StudioContext &sctx) noexcept;
+		void drawFirstPageButtons(Stage next) noexcept;
+
+		void drawLastPageButtons(StudioContext &sctx) noexcept;
+
+		void finish(StudioContext &sctx) noexcept;
 
 };
 
 template<typename T>
-void NewMenu::addItemType(ox::String displayName, ox::String parentDir, ox::String fileExt, T itemTempl, ox::ClawFormat pFmt) noexcept {
-	m_types.emplace_back(ox::make<studio::ItemMakerT<T>>(std::move(displayName), std::move(parentDir), std::move(fileExt), std::move(itemTempl), pFmt));
+void NewMenu::addItemType(
+	ox::StringParam displayName,
+	ox::StringParam parentDir,
+	ox::StringParam fileExt,
+	T itemTempl,
+	ox::ClawFormat const pFmt) noexcept {
+	m_types.emplace_back(ox::make<ItemMakerT<T>>(
+		std::move(displayName),
+		std::move(parentDir),
+		std::move(fileExt),
+		std::move(itemTempl),
+		pFmt));
 }
 
 template<typename T>
-void NewMenu::addItemType(ox::String displayName, ox::String parentDir, ox::String fileExt, ox::ClawFormat pFmt) noexcept {
-	m_types.emplace_back(ox::make<studio::ItemMakerT<T>>(std::move(displayName), std::move(parentDir), std::move(fileExt), pFmt));
+void NewMenu::addItemType(
+	ox::StringParam displayName,
+	ox::StringParam parentDir,
+	ox::StringParam fileExt,
+	ox::ClawFormat const pFmt) noexcept {
+	m_types.emplace_back(ox::make<ItemMakerT<T>>(
+		std::move(displayName),
+		std::move(parentDir),
+		std::move(fileExt),
+		pFmt));
 }
 
 }

src/olympic/studio/applib/src/newproject.cpp

@@ -49,7 +49,7 @@ void NewProject::draw(studio::StudioContext &ctx) noexcept {
 }
 
 void NewProject::drawNewProjectName(studio::StudioContext &sctx) noexcept {
-	drawWindow(sctx.tctx, &m_open, [this, &sctx] {
+	drawWindow(sctx.tctx, m_open, [this, &sctx] {
 		ig::InputText("Name", m_projectName);
 		ImGui::Text("Path: %s", m_projectPath.c_str());
 		if (ImGui::Button("Browse")) {

src/olympic/studio/applib/src/studioapp.cpp

@@ -251,6 +251,10 @@ void StudioUI::loadModule(Module const&mod) noexcept {
 	for (auto &im : mod.itemMakers(m_sctx)) {
 		m_newMenu.addItemMaker(std::move(im));
 	}
+	auto tmplts = mod.itemTemplates(m_sctx);
+	for (auto &t : tmplts) {
+		m_newMenu.installItemTemplate(t);
+	}
 }
 
 void StudioUI::loadModules() noexcept {

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

@@ -214,7 +214,8 @@ bool ListBox(
 		ox::CStringViewCR name,
 		std::function<ox::CStringView(size_t)> const&f,
 		size_t strCnt,
-		size_t &selIdx) noexcept;
+		size_t &selIdx,
+		ImVec2 const&sz = {0, 0}) noexcept;
 
 /**
  *

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

@@ -4,7 +4,9 @@
 
 #pragma once
 
-#include <ox/claw/claw.hpp>
+#include <algorithm>
+
+#include <ox/model/typenamecatcher.hpp>
 
 #include <keel/media.hpp>
 #include <turbine/context.hpp>
@@ -13,75 +15,212 @@
 
 namespace studio {
 
-class ItemMaker {
+class ItemTemplate {
+	private:
+		ox::String const m_name{"Default"};
+
 	public:
-		ox::String const typeName;
-		ox::String const parentDir;
-		ox::String const fileExt;
-		constexpr explicit ItemMaker(
+		explicit ItemTemplate() noexcept = default;
+
+		explicit ItemTemplate(ox::StringParam name) noexcept: m_name{std::move(name)} {}
+
+		virtual ~ItemTemplate() = default;
+
+		[[nodiscard]]
+		constexpr ox::String const&name() const noexcept {
+			return m_name;
+		}
+
+		constexpr bool operator<=>(ItemTemplate const&other) const noexcept {
+			return m_name != other.name() ? (m_name < other.name() ? -1 : 1) : 0;
+		}
+
+		[[nodiscard]]
+		ox::CStringView displayName() const noexcept {
+			return m_name;
+		}
+
+		[[nodiscard]]
+		virtual ox::CStringView typeName() const noexcept = 0;
+
+		[[nodiscard]]
+		virtual int typeVersion() const noexcept = 0;
+
+		virtual ox::Result<ox::UAnyPtr> getItem(
+			keel::Context &ctx, ox::StringViewCR name, int version) noexcept = 0;
+
+};
+
+template<typename T>
+class ItemTemplateT: public ItemTemplate {
+	private:
+		T const m_item;
+
+	public:
+		constexpr ItemTemplateT() noexcept = default;
+
+		explicit ItemTemplateT(ox::StringParam name, T item) noexcept:
+			ItemTemplate{std::move(name)}, m_item{std::move(item)} {}
+
+		[[nodiscard]]
+		ox::CStringView typeName() const noexcept final {
+			return ox::ModelTypeName_v<T>;
+		}
+
+		[[nodiscard]]
+		int typeVersion() const noexcept final {
+			return ox::ModelTypeVersion_v<T>;
+		}
+
+		ox::Result<ox::UAnyPtr> getItem(
+				keel::Context &kctx, ox::StringViewCR name, int const version) noexcept final {
+			if (ox::ModelTypeVersion_v<T> != version || ox::ModelTypeName_v<T> != name) {
+				OX_REQUIRE_M(item, keel::convert(kctx, m_item, name, version));
+				auto out = ox::Result<ox::UAnyPtr>{item->moveToCopy()};
+				ox::safeDelete(item.release());
+				return out;
+			}
+			return ox::UAnyPtr{new T{m_item}};
+		}
+
+};
+
+class ItemMaker {
+	private:
+		ox::Vector<ox::UPtr<ItemTemplate>> m_templates;
+		ox::String const m_parentDir;
+		ox::String const m_fileExt;
+		ox::String const m_typeDisplayName;
+
+	public:
+		constexpr ItemMaker(
 				ox::StringParam pName,
 				ox::StringParam pParentDir,
 				ox::StringParam pFileExt) noexcept:
-			typeName{std::move(pName)},
-			parentDir{std::move(pParentDir)},
-			fileExt{std::move(pFileExt)} {
+			m_parentDir{std::move(pParentDir)},
+			m_fileExt{std::move(pFileExt)},
+			m_typeDisplayName{std::move(pName)} {
 		}
+
 		virtual ~ItemMaker() noexcept = default;
 
 		[[nodiscard]]
-		virtual ox::String itemPath(ox::StringView pName) const noexcept {
-			return ox::sfmt("/{}/{}.{}", parentDir, pName, fileExt);
+		ox::String const&typeDisplayName() const noexcept {
+			return m_typeDisplayName;
 		}
 
+		bool installTemplate(ox::UPtr<ItemTemplate> &tmpl) {
+			if (typeName() == tmpl->typeName() &&
+			    typeVersion() <= tmpl->typeVersion()) {
+                m_templates.emplace_back(std::move(tmpl));
+				// begin() + 1 because 'Default' should always be first
+                std::sort(m_templates.begin() + 1, m_templates.end());
+				return true;
+            }
+			return false;
+		}
+
+		bool installTemplate(ox::UPtr<ItemTemplate> &&tmpl) {
+			return installTemplate(tmpl);
+		}
+
+		constexpr ox::Vector<ox::UPtr<ItemTemplate>> const&itemTemplates() const noexcept {
+			return m_templates;
+		}
+
+		[[nodiscard]]
+		ox::String itemPath(ox::StringViewCR pName) const noexcept {
+			return ox::sfmt("/{}/{}.{}", m_parentDir, pName, m_fileExt);
+		}
+
+		[[nodiscard]]
+		virtual ox::StringView typeName() const noexcept = 0;
+
+		[[nodiscard]]
+		virtual int typeVersion() const noexcept = 0;
+
 		/**
 		 * Returns path of the file created.
 		 * @param ctx
 		 * @param pName
+		 * @param pTemplateIdx
 		 * @return path of file or error in Result
 		 */
-		virtual ox::Result<ox::String> write(StudioContext &ctx, ox::StringView pName) const noexcept = 0;
+		virtual ox::Result<ox::String> write(
+			StudioContext &ctx, ox::StringViewCR pName, size_t pTemplateIdx) const noexcept = 0;
 };
 
 template<typename T>
-class ItemMakerT: public ItemMaker {
+class ItemMakerT final: public ItemMaker {
 	private:
-		T const m_item;
 		ox::ClawFormat const m_fmt;
+
 	public:
 		constexpr ItemMakerT(
 				ox::StringParam pDisplayName,
 				ox::StringParam pParentDir,
 				ox::StringParam fileExt,
-				ox::ClawFormat pFmt = ox::ClawFormat::Metal) noexcept:
-			ItemMaker(std::move(pDisplayName), std::move(pParentDir), std::move(fileExt)),
-			m_fmt(pFmt) {
+				ox::ClawFormat const pFmt = ox::ClawFormat::Metal) noexcept:
+				ItemMaker(
+					std::move(pDisplayName),
+					std::move(pParentDir),
+					std::move(fileExt)),
+				m_fmt{pFmt} {
+			installTemplate(ox::make_unique<ItemTemplateT<T>>());
 		}
+
 		constexpr ItemMakerT(
 				ox::StringParam pDisplayName,
 				ox::StringParam pParentDir,
 				ox::StringParam fileExt,
-				T pItem,
-				ox::ClawFormat pFmt) noexcept:
-			ItemMaker(std::move(pDisplayName), std::move(pParentDir), std::move(fileExt)),
-			m_item(std::move(pItem)),
-			m_fmt(pFmt) {
+				T const&pItem,
+				ox::ClawFormat const pFmt) noexcept:
+				ItemMaker(
+					std::move(pDisplayName),
+					std::move(pParentDir),
+					std::move(fileExt)),
+				m_fmt{pFmt} {
+			installTemplate(ox::make_unique<ItemTemplateT<T>>(std::move(pItem)));
 		}
+
 		constexpr ItemMakerT(
 				ox::StringParam pDisplayName,
 				ox::StringParam pParentDir,
 				ox::StringParam fileExt,
 				T &&pItem,
-				ox::ClawFormat pFmt) noexcept:
-			ItemMaker(std::move(pDisplayName), std::move(pParentDir), std::move(fileExt)),
-			m_item(std::move(pItem)),
-			m_fmt(pFmt) {
+				ox::ClawFormat const pFmt) noexcept:
+				ItemMaker(
+					std::move(pDisplayName),
+					std::move(pParentDir),
+					std::move(fileExt)),
+				m_fmt{pFmt} {
+			installTemplate(ox::make_unique<ItemTemplateT<T>>(std::move(pItem)));
 		}
-		ox::Result<ox::String> write(studio::StudioContext &sctx, ox::StringView const pName) const noexcept override {
+
+		ox::StringView typeName() const noexcept override {
+			return ox::ModelTypeName_v<T>;
+		}
+
+		int typeVersion() const noexcept override {
+			return ox::ModelTypeVersion_v<T>;
+		}
+
+		ox::Result<ox::String> write(
+			StudioContext &sctx,
+			ox::StringViewCR pName,
+			size_t const pTemplateIdx) const noexcept override {
 			auto const path = itemPath(pName);
 			createUuidMapping(keelCtx(sctx.tctx), path, ox::UUID::generate().unwrap());
-			OX_RETURN_ERROR(sctx.project->writeObj(path, m_item, m_fmt));
+			auto const&templates = itemTemplates();
+			auto const tmplIdx = pTemplateIdx < templates.size() ? pTemplateIdx : 0;
+			OX_REQUIRE_M(tmpl, templates[tmplIdx]->getItem(
+				keelCtx(sctx), typeName(), typeVersion()));
+			auto item = tmpl.template get<T>();
+			OX_RETURN_ERROR(sctx.project->writeObj(path, *item, m_fmt));
+			tmpl.free();
 			return path;
 		}
+
 };
 
 }

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

@@ -31,6 +31,8 @@ class Module {
 
 		virtual ox::Vector<ox::UPtr<ItemMaker>> itemMakers(studio::StudioContext&) const;
 
+		virtual ox::Vector<ox::UPtr<ItemTemplate>> itemTemplates(studio::StudioContext&) const;
+
 };
 
 template<typename Editor>

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

@@ -47,7 +47,7 @@ class Popup {
 			return m_title;
 		}
 
-		void drawWindow(turbine::Context &ctx, bool *open, std::function<void()> const&drawContents);
+		void drawWindow(turbine::Context &ctx, bool &open, std::function<void()> const&drawContents);
 
 };
 

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

@@ -136,11 +136,12 @@ bool FileComboBox(
 bool ListBox(
 		ox::CStringViewCR name,
 		std::function<ox::CStringView(size_t)> const&f,
-		size_t strCnt,
-		size_t &selIdx) noexcept {
+		size_t const strCnt,
+		size_t &selIdx,
+		ImVec2 const&sz) noexcept {
 	auto out = false;
-	if (ImGui::BeginListBox(name.c_str())) {
-		for (auto i = 0u; i < strCnt; ++i) {
+	if (ImGui::BeginListBox(name.c_str(), sz)) {
+		for (size_t i = 0; i < strCnt; ++i) {
 			auto str = f(i);
 			ig::IDStackItem const idStackItem2(static_cast<int>(i));
 			if (ImGui::Selectable(str.c_str(), selIdx == i)) {
@@ -161,6 +162,12 @@ bool ListBox(ox::CStringViewCR name, ox::SpanView<ox::String> const&list, size_t
 	}, list.size(), selIdx);
 }
 
+bool ListBox(ox::CStringViewCR name, ox::SpanView<ox::CStringView> const&list, size_t &selIdx) noexcept {
+	return ListBox(name, [list](size_t i) -> ox::CStringView {
+		return list[i];
+	}, list.size(), selIdx);
+}
+
 
 FilePicker::FilePicker(
 		StudioContext &sctx,

src/olympic/studio/modlib/src/module.cpp

@@ -6,11 +6,15 @@
 
 namespace studio {
 
-ox::Vector<EditorMaker> Module::editors(studio::StudioContext&) const {
+ox::Vector<EditorMaker> Module::editors(StudioContext&) const {
 	return {};
 }
 
-ox::Vector<ox::UPtr<ItemMaker>> Module::itemMakers(studio::StudioContext&) const {
+ox::Vector<ox::UPtr<ItemMaker>> Module::itemMakers(StudioContext&) const {
+	return {};
+}
+
+ox::Vector<ox::UPtr<ItemTemplate>> Module::itemTemplates(StudioContext&) const {
 	return {};
 }
 

src/olympic/studio/modlib/src/popup.cpp

@@ -7,11 +7,11 @@
 
 namespace studio {
 
-void Popup::drawWindow(turbine::Context &ctx, bool *open, std::function<void()> const&drawContents) {
+void Popup::drawWindow(turbine::Context &ctx, bool &open, std::function<void()> const&drawContents) {
 	studio::ig::centerNextWindow(ctx);
 	ImGui::SetNextWindowSize(static_cast<ImVec2>(m_size));
 	constexpr auto modalFlags = ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize;
-	if (ImGui::BeginPopupModal(m_title.c_str(), open, modalFlags)) {
+	if (ImGui::BeginPopupModal(m_title.c_str(), &open, modalFlags)) {
 		drawContents();
 		ImGui::EndPopup();
 	}