[nostalgia] Add NewMenu for creating new files

src/nostalgia/studio/newmenu.cpp

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#include <imgui.h>
+
+#include "lib/context.hpp"
+#include "lib/imguiuitl.hpp"
+
+#include "newmenu.hpp"
+
+namespace nostalgia {
+
+NewMenu::NewMenu() noexcept {
+	setTitle("New Item");
+	setSize({225, 110});
+}
+
+void NewMenu::open() noexcept {
+	m_stage = Stage::Opening;
+	m_selectedType = 0;
+}
+
+void NewMenu::close() noexcept {
+	m_stage = Stage::Closed;
+	m_open = false;
+}
+
+bool NewMenu::isOpen() const noexcept {
+	return m_open;
+}
+
+void NewMenu::draw(core::Context *ctx) noexcept {
+	switch (m_stage) {
+		case Stage::Opening:
+			ImGui::OpenPopup(title().c_str());
+			m_stage = Stage::NewItemType;
+			m_open = true;
+			[[fallthrough]];
+		case Stage::NewItemType:
+			drawNewItemType(ctx);
+			break;
+		case Stage::NewItemName:
+			drawNewItemName(ctx);
+			break;
+		case Stage::Closed:
+			m_open = false;
+			break;
+	}
+}
+
+void NewMenu::addItemMaker(ox::UniquePtr<studio::ItemMaker> im) noexcept {
+	m_types.emplace_back(std::move(im));
+}
+
+void NewMenu::drawNewItemType(core::Context *ctx) noexcept {
+	drawWindow(ctx, &m_open, [this] {
+		auto items = ox_malloca(m_types.size() * sizeof(const char*), const char*, nullptr);
+		for (auto i = 0u; const auto &im : m_types) {
+			items[i] = im->name.c_str();
+			++i;
+		}
+		ImGui::ListBox("Item Type", &m_selectedType, items.get(), m_types.size());
+		drawFirstPageButtons();
+		ImGui::EndPopup();
+	});
+}
+
+void NewMenu::drawNewItemName(core::Context *ctx) noexcept {
+	drawWindow(ctx, &m_open, [this, ctx] {
+		const auto typeIdx = static_cast<std::size_t>(m_selectedType);
+		if (typeIdx < m_types.size()) {
+			ImGui::InputText("Name", m_itemName.data(), m_itemName.cap());
+		}
+		drawLastPageButtons(ctx);
+		ImGui::EndPopup();
+	});
+}
+
+void NewMenu::drawFirstPageButtons() noexcept {
+	ImGui::SetCursorPosX(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x - 80);
+	ImGui::SetCursorPosY(ImGui::GetCursorPosY() + ImGui::GetContentRegionAvail().y - 20);
+	if (ImGui::Button("Next")) {
+		m_stage = Stage::NewItemName;
+	}
+	ImGui::SameLine();
+	if (ImGui::Button("Quit")) {
+		ImGui::CloseCurrentPopup();
+		m_stage = Stage::Closed;
+	}
+}
+
+void NewMenu::drawLastPageButtons(core::Context *ctx) noexcept {
+	ImGui::SetCursorPosX(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x - 138);
+	ImGui::SetCursorPosY(ImGui::GetCursorPosY() + ImGui::GetContentRegionAvail().y - 20);
+	if (ImGui::Button("Back")) {
+		m_stage = Stage::NewItemType;
+	}
+	ImGui::SameLine();
+	if (ImGui::Button("Finish")) {
+		finish(ctx);
+	}
+	ImGui::SameLine();
+	if (ImGui::Button("Quit")) {
+		ImGui::CloseCurrentPopup();
+		m_stage = Stage::Closed;
+	}
+}
+
+void NewMenu::finish(core::Context *ctx) noexcept {
+	const auto err = m_types[static_cast<std::size_t>(m_selectedType)]->write(ctx, m_itemName.c_str());
+	if (err) {
+		oxDebugf("NewMenu::finish() error: {}", toStr(err));
+		oxLogError(err);
+		return;
+	}
+	finished.emit("");
+	m_stage = Stage::Closed;
+}
+
+}