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Diffstat (limited to 'src/qmlmodels/qqmldmobjectdata_p.h')
| -rw-r--r-- | src/qmlmodels/qqmldmobjectdata_p.h | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/src/qmlmodels/qqmldmobjectdata_p.h b/src/qmlmodels/qqmldmobjectdata_p.h new file mode 100644 index 0000000000..0368572b36 --- /dev/null +++ b/src/qmlmodels/qqmldmobjectdata_p.h @@ -0,0 +1,247 @@ +// 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 + +#ifndef QQMLDMOBJECTDATA_P_H +#define QQMLDMOBJECTDATA_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include <private/qqmladaptormodelenginedata_p.h> +#include <private/qqmldelegatemodel_p_p.h> + +#include <private/qobject_p.h> +#include <QtCore/qpointer.h> + +QT_BEGIN_NAMESPACE + +class VDMObjectDelegateDataType; +class QQmlDMObjectData : public QQmlDelegateModelItem, public QQmlAdaptorModelProxyInterface +{ + Q_OBJECT + Q_PROPERTY(QObject *modelData READ modelData NOTIFY modelDataChanged) + QT_ANONYMOUS_PROPERTY(QObject * READ modelData NOTIFY modelDataChanged FINAL) + Q_INTERFACES(QQmlAdaptorModelProxyInterface) +public: + QQmlDMObjectData( + const QQmlRefPointer<QQmlDelegateModelItemMetaType> &metaType, + VDMObjectDelegateDataType *dataType, + int index, int row, int column, + QObject *object); + + void setModelData(QObject *modelData) + { + if (modelData == object) + return; + + object = modelData; + emit modelDataChanged(); + } + + QObject *modelData() const { return object; } + QObject *proxiedObject() override { return object; } + + QPointer<QObject> object; + +Q_SIGNALS: + void modelDataChanged(); +}; + +class VDMObjectDelegateDataType final + : public QQmlRefCounted<VDMObjectDelegateDataType>, + public QQmlAdaptorModel::Accessors +{ +public: + int propertyOffset; + int signalOffset; + bool shared; + QMetaObjectBuilder builder; + + VDMObjectDelegateDataType() + : propertyOffset(0) + , signalOffset(0) + , shared(true) + { + } + + VDMObjectDelegateDataType(const VDMObjectDelegateDataType &type) + : propertyOffset(type.propertyOffset) + , signalOffset(type.signalOffset) + , shared(false) + , builder(type.metaObject.data(), QMetaObjectBuilder::Properties + | QMetaObjectBuilder::Signals + | QMetaObjectBuilder::SuperClass + | QMetaObjectBuilder::ClassName) + { + builder.setFlags(MetaObjectFlag::DynamicMetaObject); + } + + int rowCount(const QQmlAdaptorModel &model) const override + { + return model.list.count(); + } + + int columnCount(const QQmlAdaptorModel &) const override + { + return 1; + } + + QVariant value(const QQmlAdaptorModel &model, int index, const QString &role) const override + { + if (QObject *object = model.list.at(index).value<QObject *>()) + return object->property(role.toUtf8()); + return QVariant(); + } + + QQmlDelegateModelItem *createItem( + QQmlAdaptorModel &model, + const QQmlRefPointer<QQmlDelegateModelItemMetaType> &metaType, + int index, int row, int column) override + { + if (!metaObject) + initializeMetaType(model); + return index >= 0 && index < model.list.count() + ? new QQmlDMObjectData(metaType, this, index, row, column, qvariant_cast<QObject *>(model.list.at(index))) + : nullptr; + } + + void initializeMetaType(QQmlAdaptorModel &model) + { + Q_UNUSED(model); + QQmlAdaptorModelEngineData::setModelDataType<QQmlDMObjectData>(&builder, this); + + metaObject.reset(builder.toMetaObject()); + // Note: ATM we cannot create a shared property cache for this class, since each model + // object can have different properties. And to make those properties available to the + // delegate, QQmlDMObjectData makes use of a QAbstractDynamicMetaObject subclass + // (QQmlDMObjectDataMetaObject), which we cannot represent in a QQmlPropertyCache. + // By not having a shared property cache, revisioned properties in QQmlDelegateModelItem + // will always be available to the delegate, regardless of the import version. + } + + void cleanup(QQmlAdaptorModel &) const override + { + release(); + } + + bool notify(const QQmlAdaptorModel &model, const QList<QQmlDelegateModelItem *> &items, int index, int count, const QVector<int> &) const override + { + for (auto modelItem : items) { + const int modelItemIndex = modelItem->index; + if (modelItemIndex < index || modelItemIndex >= index + count) + continue; + + auto objectModelItem = static_cast<QQmlDMObjectData *>(modelItem); + QObject *updatedModelData = qvariant_cast<QObject *>(model.list.at(objectModelItem->index)); + objectModelItem->setModelData(updatedModelData); + } + return true; + } +}; + +class QQmlDMObjectDataMetaObject : public QAbstractDynamicMetaObject +{ +public: + QQmlDMObjectDataMetaObject(QQmlDMObjectData *data, VDMObjectDelegateDataType *type) + : m_data(data) + , m_type(type) + { + QObjectPrivate *op = QObjectPrivate::get(m_data); + *static_cast<QMetaObject *>(this) = *type->metaObject; + op->metaObject = this; + m_type->addref(); + } + + ~QQmlDMObjectDataMetaObject() + { + m_type->release(); + } + + int metaCall(QObject *o, QMetaObject::Call call, int id, void **arguments) override + { + Q_ASSERT(o == m_data); + Q_UNUSED(o); + + static const int objectPropertyOffset = QObject::staticMetaObject.propertyCount(); + if (id >= m_type->propertyOffset + && (call == QMetaObject::ReadProperty + || call == QMetaObject::WriteProperty + || call == QMetaObject::ResetProperty)) { + if (m_data->object) + QMetaObject::metacall(m_data->object, call, id - m_type->propertyOffset + objectPropertyOffset, arguments); + return -1; + } else if (id >= m_type->signalOffset && call == QMetaObject::InvokeMetaMethod) { + QMetaObject::activate(m_data, this, id - m_type->signalOffset, nullptr); + return -1; + } else { + return m_data->qt_metacall(call, id, arguments); + } + } + + int createProperty(const char *name, const char *) override + { + if (!m_data->object) + return -1; + const QMetaObject *metaObject = m_data->object->metaObject(); + static const int objectPropertyOffset = QObject::staticMetaObject.propertyCount(); + + const int previousPropertyCount = propertyCount() - propertyOffset(); + int propertyIndex = metaObject->indexOfProperty(name); + if (propertyIndex == -1) + return -1; + if (previousPropertyCount + objectPropertyOffset == metaObject->propertyCount()) + return propertyIndex + m_type->propertyOffset - objectPropertyOffset; + + if (m_type->shared) { + VDMObjectDelegateDataType *type = m_type; + m_type = new VDMObjectDelegateDataType(*m_type); + type->release(); + } + + const int previousMethodCount = methodCount(); + int notifierId = previousMethodCount - methodOffset(); + for (int propertyId = previousPropertyCount; propertyId < metaObject->propertyCount() - objectPropertyOffset; ++propertyId) { + QMetaProperty property = metaObject->property(propertyId + objectPropertyOffset); + QMetaPropertyBuilder propertyBuilder; + if (property.hasNotifySignal()) { + m_type->builder.addSignal("__" + QByteArray::number(propertyId) + "()"); + propertyBuilder = m_type->builder.addProperty(property.name(), property.typeName(), notifierId); + ++notifierId; + } else { + propertyBuilder = m_type->builder.addProperty(property.name(), property.typeName()); + } + propertyBuilder.setWritable(property.isWritable()); + propertyBuilder.setResettable(property.isResettable()); + propertyBuilder.setConstant(property.isConstant()); + } + + m_type->metaObject.reset(m_type->builder.toMetaObject()); + *static_cast<QMetaObject *>(this) = *m_type->metaObject; + + notifierId = previousMethodCount; + for (int i = previousPropertyCount; i < metaObject->propertyCount() - objectPropertyOffset; ++i) { + QMetaProperty property = metaObject->property(i + objectPropertyOffset); + if (property.hasNotifySignal()) { + QQmlPropertyPrivate::connect( + m_data->object, property.notifySignalIndex(), m_data, notifierId); + ++notifierId; + } + } + return propertyIndex + m_type->propertyOffset - objectPropertyOffset; + } + + QQmlDMObjectData *m_data; + VDMObjectDelegateDataType *m_type; +}; + +QT_END_NAMESPACE + +#endif // QQMLDMOBJECTDATA_P_H |