1 files changed, 157 insertions, 0 deletions
diff --git a/src/qmlmodels/qqmldmlistaccessordata.cpp b/src/qmlmodels/qqmldmlistaccessordata.cpp
new file mode 100644
index 0000000000..bfd353771c
--- /dev/null
+++ b/src/qmlmodels/qqmldmlistaccessordata.cpp
@@ -0,0 +1,157 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include <private/qqmldmlistaccessordata_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QQmlDMListAccessorData::QQmlDMListAccessorData(
+        const QQmlRefPointer<QQmlDelegateModelItemMetaType> &metaType,
+        VDMListDelegateDataType *dataType,
+        int index, int row, int column, const QVariant &value)
+    : QQmlDelegateModelItem(metaType, dataType, index, row, column)
+    , cachedData(value)
+{
+    QObjectPrivate::get(this)->metaObject = dataType;
+    dataType->addref();
+}
+
+QQmlDMListAccessorData::~QQmlDMListAccessorData()
+{
+    QObjectPrivate *d = QObjectPrivate::get(this);
+    static_cast<VDMListDelegateDataType *>(d->metaObject)->release();
+    d->metaObject = nullptr;
+}
+
+void QQmlDMListAccessorData::setModelData(const QVariant &data) {
+    if (data == cachedData)
+        return;
+
+    cachedData = data;
+    cachedDataClean = false;
+    static_cast<const VDMListDelegateDataType *>(QObjectPrivate::get(this)->metaObject)
+            ->emitAllSignals(this);
+}
+
+void QQmlDMListAccessorData::setValue(const QString &role, const QVariant &value)
+{
+    // Used only for initialization of the cached data. Does not have to emit change signals.
+    Q_ASSERT(!cachedDataClean);
+
+    if (role == QLatin1String("modelData") || role.isEmpty())
+        cachedData = value;
+    else
+        VDMListDelegateDataType::setValue(&cachedData, role, value);
+}
+
+bool QQmlDMListAccessorData::resolveIndex(const QQmlAdaptorModel &model, int idx)
+{
+    if (index == -1) {
+        index = idx;
+        setModelData(model.list.at(idx));
+        emit modelIndexChanged();
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void VDMListDelegateDataType::emitAllSignals(QQmlDMListAccessorData *accessor) const
+{
+    for (int i = propertyOffset, end = propertyCount(); i != end; ++i)
+        QMetaObject::activate(accessor, this, i - propertyOffset, nullptr);
+    emit accessor->modelDataChanged();
+}
+
+int VDMListDelegateDataType::metaCall(
+        QObject *object, QMetaObject::Call call, int id, void **arguments)
+{
+    Q_ASSERT(qobject_cast<QQmlDMListAccessorData *>(object));
+    QQmlDMListAccessorData *accessor = static_cast<QQmlDMListAccessorData *>(object);
+
+    switch (call) {
+    case QMetaObject::ReadProperty: {
+        if (id < propertyOffset)
+            break;
+
+        QVariant *result = static_cast<QVariant *>(arguments[0]);
+        const QByteArray name = property(id).name();
+        const QVariant data = accessor->index == -1
+                ? accessor->modelData()
+                : model->list.at(accessor->index);
+        *result = value(&data, name);
+        return -1;
+    }
+    case QMetaObject::WriteProperty: {
+        if (id < propertyOffset)
+            break;
+
+        const QVariant &argument = *static_cast<QVariant *>(arguments[0]);
+        const QByteArray name = property(id).name();
+        QVariant data = accessor->index == -1
+                ? accessor->modelData()
+                : model->list.at(accessor->index);
+        if (argument == value(&data, name))
+            return -1;
+        setValue(&data, name, argument);
+        if (accessor->index == -1) {
+            accessor->cachedData = data;
+            accessor->cachedDataClean = false;
+        } else {
+            model->list.set(accessor->index, data);
+        }
+        QMetaObject::activate(accessor, this, id - propertyOffset, nullptr);
+        emit accessor->modelDataChanged();
+        return -1;
+    }
+    default:
+        break;
+    }
+
+    return accessor->qt_metacall(call, id, arguments);
+}
+
+int VDMListDelegateDataType::createProperty(const char *name, const char *)
+{
+    const int propertyIndex = propertyCount() - propertyOffset;
+
+    // We use QVariant because the types may be different in the different objects.
+    QQmlAdaptorModelEngineData::addProperty(
+            &builder, propertyIndex, name, QByteArrayLiteral("QVariant"));
+
+    metaObject.reset(builder.toMetaObject());
+    *static_cast<QMetaObject *>(this) = *metaObject;
+    return propertyIndex + propertyOffset;
+}
+
+QMetaObject *VDMListDelegateDataType::toDynamicMetaObject(QObject *object)
+{
+    if (const QQmlRefPointer<QQmlContextData> &contextData
+            = static_cast<QQmlDMListAccessorData *>(object)->contextData) {
+        if (contextData->contextObject() == object) {
+            // We are using context properties. There should be a propertyCache so that row and
+            // column are hidden. We shall also return the static metaObject in that case.
+
+            if (!propertyCache) {
+                propertyCache = QQmlPropertyCache::createStandalone(
+                        &QQmlDMListAccessorData::staticMetaObject, model->modelItemRevision);
+                if (QQmlData *ddata = QQmlData::get(object, true))
+                    ddata->propertyCache = propertyCache;
+            }
+
+            // ### Qt 7: Return const from toDynamicMetaObject() and drop the const_cast.
+            return const_cast<QMetaObject *>(&QQmlDMListAccessorData::staticMetaObject);
+        }
+    }
+
+    // If the context object is not the model object, we are using required properties.
+    // In that case, create any extra properties.
+    QQmlDMListAccessorData *data = static_cast<QQmlDMListAccessorData *>(object);
+    if (!data->cachedDataClean) {
+        createMissingProperties(&data->cachedData);
+        data->cachedDataClean = true;
+    }
+    return this;
+}
+
+QT_END_NAMESPACE