init

Telegram/lib_ui/ui/qt_object_factory.h

@@ -0,0 +1,65 @@
+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include <QtWidgets/QWidget>
+
+namespace Ui {
+namespace details {
+
+template <typename Value>
+class AttachmentOwner : public QObject {
+public:
+	template <typename ...Args>
+	AttachmentOwner(QObject *parent, Args &&...args)
+	: QObject(parent)
+	, _value(std::forward<Args>(args)...) {
+	}
+
+	gsl::not_null<Value*> value() {
+		return &_value;
+	}
+
+private:
+	Value _value;
+
+};
+
+} // namespace details
+
+template <typename Value, typename Parent, typename ...Args>
+inline Value *CreateChild(
+		Parent parent,
+		Args &&...args) {
+	if constexpr (std::is_pointer_v<Parent>) {
+		Expects(parent != nullptr);
+
+		if constexpr (std::is_base_of_v<QObject, Value>) {
+			return new Value(parent, std::forward<Args>(args)...);
+		} else {
+			return CreateChild<details::AttachmentOwner<Value>>(
+				parent,
+				std::forward<Args>(args)...)->value();
+		}
+	} else if constexpr (requires(const Parent & t) { t.get(); }) {
+		return new Value(parent.get(), std::forward<Args>(args)...);
+	} else {
+		static_assert(requires(const Parent &t) { t.data(); });
+		return new Value(parent.data(), std::forward<Args>(args)...);
+	}
+}
+
+template <typename Value>
+inline gsl::not_null<details::AttachmentOwner<std::decay_t<Value>>*> WrapAsQObject(
+		gsl::not_null<QObject*> parent,
+		Value &&value) {
+	return CreateChild<details::AttachmentOwner<std::decay_t<Value>>>(
+		parent.get(),
+		std::forward<Value>(value));
+}
+
+} // namespace Ui