all: replace list properties with ObjectModels

src/core/model.hpp

@@ -0,0 +1,86 @@
+#pragma once
+
+#include <qabstractitemmodel.h>
+#include <qcontainerfwd.h>
+#include <qobject.h>
+#include <qqmlintegration.h>
+#include <qqmllist.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+#include <qvariant.h>
+
+#include "doc.hpp"
+
+///! View into a list of objets
+/// Typed view into a list of objects.
+///
+/// An ObjectModel works as a QML [Data Model], allowing efficient interaction with
+/// components that act on models. It has a single role named `modelData`, to match the
+/// behavior of lists.
+/// The same information contained in the list model is available as a normal list
+/// via the `values` property.
+///
+/// #### Differences from a list
+/// Unlike with a list, the following property binding will never be updated when `model[3]` changes.
+/// ```qml
+/// // will not update reactively
+/// property var foo: model[3]
+/// ```
+///
+/// You can work around this limitation using the `values` property of the model to view it as a list.
+/// ```qml
+/// // will update reactively
+/// property var foo: model.values[3]
+/// ```
+///
+/// [Data Model]: https://doc.qt.io/qt-6/qtquick-modelviewsdata-modelview.html#qml-data-models
+class UntypedObjectModel: public QAbstractListModel {
+	QSDOC_CNAME(ObjectModel);
+	Q_OBJECT;
+	/// The content of the object model, as a QML list.
+	/// The values of this property will always be of the type of the model.
+	Q_PROPERTY(QQmlListProperty<QObject> values READ values NOTIFY valuesChanged);
+	QML_NAMED_ELEMENT(ObjectModel);
+	QML_UNCREATABLE("ObjectModels cannot be created directly.");
+
+public:
+	explicit UntypedObjectModel(QObject* parent): QAbstractListModel(parent) {}
+
+	[[nodiscard]] qint32 rowCount(const QModelIndex& parent) const override;
+	[[nodiscard]] QVariant data(const QModelIndex& index, qint32 role) const override;
+	[[nodiscard]] QHash<int, QByteArray> roleNames() const override;
+
+	[[nodiscard]] QQmlListProperty<QObject> values();
+	void removeAt(qsizetype index);
+
+	Q_INVOKABLE qsizetype indexOf(QObject* object);
+
+signals:
+	void valuesChanged();
+
+protected:
+	void insertObject(QObject* object, qsizetype index = -1);
+	bool removeObject(const QObject* object);
+
+	QVector<QObject*> valuesList;
+
+private:
+	static qsizetype valuesCount(QQmlListProperty<QObject>* property);
+	static QObject* valueAt(QQmlListProperty<QObject>* property, qsizetype index);
+};
+
+template <typename T>
+class ObjectModel: public UntypedObjectModel {
+public:
+	explicit ObjectModel(QObject* parent): UntypedObjectModel(parent) {}
+
+	[[nodiscard]] const QVector<T*>& valueList() const {
+		return *reinterpret_cast<const QVector<T*>*>(&this->valuesList); // NOLINT
+	}
+
+	void insertObject(T* object, qsizetype index = -1) {
+		this->UntypedObjectModel::insertObject(object, index);
+	}
+
+	void removeObject(const T* object) { this->UntypedObjectModel::removeObject(object); }
+};