feat: add Variants type for creating instances

src/cpp/variants.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <qcontainerfwd.h>
+#include <qlist.h>
+#include <qmap.h>
+#include <qobject.h>
+#include <qqmlcomponent.h>
+#include <qqmlparserstatus.h>
+
+// extremely inefficient map
+template <typename K, typename V>
+class AwfulMap {
+public:
+	[[nodiscard]] bool contains(const K& key) const;
+	void insert(K key, V value); // assumes no duplicates
+	bool remove(const K& key);   // returns true if anything was removed
+	QList<QPair<K, V>> values;
+};
+
+class Variants: public QObject, public QQmlParserStatus {
+	Q_OBJECT;
+	Q_PROPERTY(QQmlComponent* component MEMBER mComponent);
+	Q_PROPERTY(QVariantList variants MEMBER mVariants WRITE setVariants);
+	Q_CLASSINFO("DefaultProperty", "component");
+	QML_ELEMENT;
+
+public:
+	explicit Variants(QObject* parent = nullptr): QObject(parent) {}
+
+	void classBegin() override {};
+	void componentComplete() override;
+
+private:
+	void setVariants(QVariantList variants);
+	void updateVariants();
+
+	QQmlComponent* mComponent = nullptr;
+	QVariantList mVariants;
+	AwfulMap<QVariantMap, QObject*> instances;
+};