[nostalgia] Add NewMenu for creating new files

src/nostalgia/studio/lib/popup.hpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#pragma once
+
+#include <ox/event/signal.hpp>
+#include <ox/std/string.hpp>
+
+#include <nostalgia/geo/vec.hpp>
+#include <nostalgia/core/context.hpp>
+
+#include "imguiuitl.hpp"
+
+namespace nostalgia::studio {
+
+
+class Popup {
+	private:
+		geo::Vec2 m_size;
+		ox::String m_title;
+	public:
+		// emits path parameter
+		ox::Signal<ox::Error(const ox::String&)> finished;
+
+		virtual ~Popup() noexcept = default;
+
+		virtual void open() noexcept = 0;
+
+		virtual void close() noexcept = 0;
+
+		[[nodiscard]]
+		virtual bool isOpen() const noexcept = 0;
+
+		virtual void draw(core::Context *ctx) noexcept = 0;
+
+	protected:
+		constexpr void setSize(geo::Size sz) noexcept {
+			m_size = {static_cast<float>(sz.width), static_cast<float>(sz.height)};
+		}
+
+		constexpr void setTitle(ox::String title) noexcept {
+			m_title = std::move(title);
+		}
+
+		constexpr const ox::String &title() const noexcept {
+			return m_title;
+		}
+
+		void drawWindow(core::Context *ctx, bool *open, auto 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)) {
+				drawContents();
+			}
+		}
+
+};
+
+
+}