src/modeleditor.h

/*
 *  LDForge: LDraw parts authoring CAD
 *  Copyright (C) 2013 - 2020 Teemu Piippo
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once
#include "model.h"

/**
 * @brief Provides an interface for editing a model such that signals are emitted for each edit done.
 * User edits to models should always be done through this class.
 */
class ModelEditor : public QObject
{
	Q_OBJECT
public:
	ModelEditor(Model& model);
	~ModelEditor();
	template<typename T, typename... Args>
	ldraw::Id<T> append(Args&&... args);
	ldraw::id_t append(std::unique_ptr<ldraw::Object>&& object);
	template<typename T, typename... Args>
	ldraw::Id<T> insert(int position, Args&&... args);
	void remove(int position);
	template<ldraw::Property property>
	void setObjectProperty(ldraw::id_t id, const ldraw::PropertyType<property>& value);
	auto setObjectProperty(ldraw::id_t id, ldraw::Property property, const QVariant& value)
		-> ldraw::Object::SetPropertyResult;
	void setObjectPoint(ldraw::id_t id, int pointId, const glm::vec3& value);
	template<typename T, typename Fn>
	bool modifyObject(ldraw::Id<T> id, Fn&& function);
	template<typename T, typename Fn>
	bool modifyObjectAt(int position, Fn&& function);
	const Model& model();
Q_SIGNALS:
	void objectAdded(int position);
	void objectModified(int position);
	void objectRemoved(ldraw::id_t id);
private:
	QSet<ldraw::id_t> modifiedObjects;
	Model& storedModel;
};

template<ldraw::Property Property>
void ModelEditor::setObjectProperty(const ldraw::id_t id, const ldraw::PropertyType<Property>& value)
{
	this->modifyObject(id, [&](ldraw::Object* object){
		object->setProperty<Property>(value);
	});
}

template<typename T, typename... Args>
ldraw::Id<T> ModelEditor::append(Args&&... args)
{
	return this->storedModel.append<T>(args...);
}

template<typename T, typename... Args>
ldraw::Id<T> ModelEditor::insert(int position, Args&&... args)
{
	return this->storedModel.insert<T>(position, args...);
}

template<typename T, typename Fn>
bool ModelEditor::modifyObject(ldraw::Id<T> id, Fn&& function)
{
	QModelIndex index = this->model().find(id);
	return this->modifyObjectAt<T>(index.row(), function);
}

template<typename T, typename Fn>
bool ModelEditor::modifyObjectAt(int position, Fn&& function)
{
	if (position >= 0 and position < this->model().size())
	{
		T* object = dynamic_cast<T*>(this->storedModel[position]);
		if (object != nullptr)
		{
			Q_EMIT this->objectModified(position);
			function(object);
			return true;
		}
	}
	return false;
}