qabstractitemmodel.cpp

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// Copyright (C) 2022 The Qt Company Ltd.
// Copyright (C) 2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qabstractitemmodel.h"
#include <private/qabstractitemmodel_p.h>
#include <qdatastream.h>
#include <qstringlist.h>
#include <qsize.h>
#include <qmimedata.h>
#include <qdebug.h>
#include <qlist.h>
#if QT_CONFIG(regularexpression)
#  include <qregularexpression.h>
#endif
#include <qstack.h>
#include <qmap.h>
#include <qbitarray.h>
#include <qdatetime.h>
#include <qloggingcategory.h>
 
#include <limits.h>
 
QT_BEGIN_NAMESPACE
 
Q_LOGGING_CATEGORY(lcCheckIndex, "qt.core.qabstractitemmodel.checkindex")
 
QT_IMPL_METATYPE_EXTERN(QModelIndexList)
 
QPersistentModelIndexData *QPersistentModelIndexData::create(const QModelIndex &index)
{
    Q_ASSERT(index.isValid()); // we will _never_ insert an invalid index in the list
    QPersistentModelIndexData *d = nullptr;
    QAbstractItemModel *model = const_cast<QAbstractItemModel *>(index.model());
    QMultiHash<QModelIndex, QPersistentModelIndexData *> &indexes = model->d_func()->persistent.indexes;
    const auto it = indexes.constFind(index);
    if (it != indexes.cend()) {
        d = (*it);
    } else {
        d = new QPersistentModelIndexData(index);
        indexes.insert(index, d);
    }
    Q_ASSERT(d);
    return d;
}
 
void QPersistentModelIndexData::destroy(QPersistentModelIndexData *data)
{
    Q_ASSERT(data);
    Q_ASSERT(data->ref.loadRelaxed() == 0);
    QAbstractItemModel *model = const_cast<QAbstractItemModel *>(data->index.model());
    // a valid persistent model index with a null model pointer can only happen if the model was destroyed
    if (model) {
        QAbstractItemModelPrivate *p = model->d_func();
        Q_ASSERT(p);
        p->removePersistentIndexData(data);
    }
    delete data;
}
 
QPersistentModelIndex::QPersistentModelIndex()
    : d(nullptr)
{
}
 
QPersistentModelIndex::QPersistentModelIndex(const QPersistentModelIndex &other)
    : d(other.d)
{
    if (d) d->ref.ref();
}
 
QPersistentModelIndex::QPersistentModelIndex(const QModelIndex &index)
    : d(nullptr)
{
    if (index.isValid()) {
        d = QPersistentModelIndexData::create(index);
        d->ref.ref();
    }
}
 
QPersistentModelIndex::~QPersistentModelIndex()
{
    if (d && !d->ref.deref()) {
        QPersistentModelIndexData::destroy(d);
        d = nullptr;
    }
}
 
bool QPersistentModelIndex::operator==(const QPersistentModelIndex &other) const
{
    if (d && other.d)
        return d->index == other.d->index;
    return d == other.d;
}
 
bool QPersistentModelIndex::operator<(const QPersistentModelIndex &other) const
{
    if (d && other.d)
        return d->index < other.d->index;
 
    return d < other.d;
}
 
QPersistentModelIndex &QPersistentModelIndex::operator=(const QPersistentModelIndex &other)
{
    if (d == other.d)
        return *this;
    if (d && !d->ref.deref())
        QPersistentModelIndexData::destroy(d);
    d = other.d;
    if (d) d->ref.ref();
    return *this;
}
QPersistentModelIndex &QPersistentModelIndex::operator=(const QModelIndex &other)
{
    if (d && !d->ref.deref())
        QPersistentModelIndexData::destroy(d);
    if (other.isValid()) {
        d = QPersistentModelIndexData::create(other);
        if (d) d->ref.ref();
    } else {
        d = nullptr;
    }
    return *this;
}
 
QPersistentModelIndex::operator QModelIndex() const
{
    if (d)
        return d->index;
    return QModelIndex();
}
 
bool QPersistentModelIndex::operator==(const QModelIndex &other) const
{
    if (d)
        return d->index == other;
    return !other.isValid();
}
 
bool QPersistentModelIndex::operator!=(const QModelIndex &other) const
{
    if (d)
        return d->index != other;
    return other.isValid();
}
 
int QPersistentModelIndex::row() const
{
    if (d)
        return d->index.row();
    return -1;
}
 
int QPersistentModelIndex::column() const
{
    if (d)
        return d->index.column();
    return -1;
}
 
void *QPersistentModelIndex::internalPointer() const
{
    if (d)
        return d->index.internalPointer();
    return nullptr;
}
 
const void *QPersistentModelIndex::constInternalPointer() const
{
    if (d)
        return d->index.constInternalPointer();
    return nullptr;
}
 
quintptr QPersistentModelIndex::internalId() const
{
    if (d)
        return d->index.internalId();
    return 0;
}
 
QModelIndex QPersistentModelIndex::parent() const
{
    if (d)
        return d->index.parent();
    return QModelIndex();
}
 
QModelIndex QPersistentModelIndex::sibling(int row, int column) const
{
    if (d)
        return d->index.sibling(row, column);
    return QModelIndex();
}
 
QVariant QPersistentModelIndex::data(int role) const
{
    if (d)
        return d->index.data(role);
    return QVariant();
}
 
 
void QPersistentModelIndex::multiData(QModelRoleDataSpan roleDataSpan) const
{
    if (d)
        d->index.multiData(roleDataSpan);
}
 
Qt::ItemFlags QPersistentModelIndex::flags() const
{
    if (d)
        return d->index.flags();
    return { };
}
 
const QAbstractItemModel *QPersistentModelIndex::model() const
{
    if (d)
        return d->index.model();
    return nullptr;
}
 
bool QPersistentModelIndex::isValid() const
{
    return d && d->index.isValid();
}
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QModelIndex &idx)
{
    QDebugStateSaver saver(dbg);
    dbg.nospace() << "QModelIndex(" << idx.row() << ',' << idx.column()
                  << ',' << idx.internalPointer() << ',' << idx.model() << ')';
    return dbg;
}
 
QDebug operator<<(QDebug dbg, const QPersistentModelIndex &idx)
{
    if (idx.d)
        dbg << idx.d->index;
    else
        dbg << QModelIndex();
    return dbg;
}
#endif
 
class QEmptyItemModel : public QAbstractItemModel
{
public:
    explicit QEmptyItemModel(QObject *parent = nullptr) : QAbstractItemModel(parent) {}
    QModelIndex index(int, int, const QModelIndex &) const override { return QModelIndex(); }
    QModelIndex parent(const QModelIndex &) const override { return QModelIndex(); }
    int rowCount(const QModelIndex &) const override { return 0; }
    int columnCount(const QModelIndex &) const override { return 0; }
    bool hasChildren(const QModelIndex &) const override { return false; }
    QVariant data(const QModelIndex &, int) const override { return QVariant(); }
};
 
Q_GLOBAL_STATIC(QEmptyItemModel, qEmptyModel)
 
 
QAbstractItemModelPrivate::QAbstractItemModelPrivate()
    : QObjectPrivate()
{
}
 
QAbstractItemModelPrivate::~QAbstractItemModelPrivate()
{
}
 
QAbstractItemModel *QAbstractItemModelPrivate::staticEmptyModel()
{
    return qEmptyModel();
}
 
void QAbstractItemModelPrivate::invalidatePersistentIndexes()
{
    for (QPersistentModelIndexData *data : std::as_const(persistent.indexes))
        data->index = QModelIndex();
    persistent.indexes.clear();
}
 
void QAbstractItemModelPrivate::invalidatePersistentIndex(const QModelIndex &index) {
    const auto it = persistent.indexes.constFind(index);
    if (it != persistent.indexes.cend()) {
        QPersistentModelIndexData *data = *it;
        persistent.indexes.erase(it);
        data->index = QModelIndex();
    }
}
 
using DefaultRoleNames = QHash<int, QByteArray>;
Q_GLOBAL_STATIC(DefaultRoleNames, qDefaultRoleNames,
    {
        { Qt::DisplayRole,    "display"    },
        { Qt::DecorationRole, "decoration" },
        { Qt::EditRole,       "edit"       },
        { Qt::ToolTipRole,    "toolTip"    },
        { Qt::StatusTipRole,  "statusTip"  },
        { Qt::WhatsThisRole,  "whatsThis"  },
    })
 
const QHash<int,QByteArray> &QAbstractItemModelPrivate::defaultRoleNames()
{
    return *qDefaultRoleNames();
}
 
bool QAbstractItemModelPrivate::isVariantLessThan(const QVariant &left, const QVariant &right,
                                                  Qt::CaseSensitivity cs, bool isLocaleAware)
{
    if (left.userType() == QMetaType::UnknownType)
        return false;
    if (right.userType() == QMetaType::UnknownType)
        return true;
    switch (left.userType()) {
    case QMetaType::Int:
        return left.toInt() < right.toInt();
    case QMetaType::UInt:
        return left.toUInt() < right.toUInt();
    case QMetaType::LongLong:
        return left.toLongLong() < right.toLongLong();
    case QMetaType::ULongLong:
        return left.toULongLong() < right.toULongLong();
    case QMetaType::Float:
        return left.toFloat() < right.toFloat();
    case QMetaType::Double:
        return left.toDouble() < right.toDouble();
    case QMetaType::QChar:
        return left.toChar() < right.toChar();
    case QMetaType::QDate:
        return left.toDate() < right.toDate();
    case QMetaType::QTime:
        return left.toTime() < right.toTime();
    case QMetaType::QDateTime:
        return left.toDateTime() < right.toDateTime();
    case QMetaType::QString:
    default:
        if (isLocaleAware)
            return left.toString().localeAwareCompare(right.toString()) < 0;
        else
            return left.toString().compare(right.toString(), cs) < 0;
    }
}
 
 
static uint typeOfVariant(const QVariant &value)
{
    //return 0 for integer, 1 for floating point and 2 for other
    switch (value.userType()) {
        case QMetaType::Bool:
        case QMetaType::Int:
        case QMetaType::UInt:
        case QMetaType::LongLong:
        case QMetaType::ULongLong:
        case QMetaType::QChar:
        case QMetaType::Short:
        case QMetaType::UShort:
        case QMetaType::UChar:
        case QMetaType::ULong:
        case QMetaType::Long:
            return 0;
        case QMetaType::Double:
        case QMetaType::Float:
            return 1;
        default:
            return 2;
    }
}
 
bool QAbstractItemModelPrivate::variantLessThan(const QVariant &v1, const QVariant &v2)
{
    switch(qMax(typeOfVariant(v1), typeOfVariant(v2)))
    {
    case 0: //integer type
        return v1.toLongLong() < v2.toLongLong();
    case 1: //floating point
        return v1.toReal() < v2.toReal();
    default:
        return v1.toString().localeAwareCompare(v2.toString()) < 0;
    }
}
 
void QAbstractItemModelPrivate::removePersistentIndexData(QPersistentModelIndexData *data)
{
    if (data->index.isValid()) {
        int removed = persistent.indexes.remove(data->index);
        Q_ASSERT_X(removed == 1, "QPersistentModelIndex::~QPersistentModelIndex",
                   "persistent model indexes corrupted"); //maybe the index was somewhat invalid?
        // This assert may happen if the model use changePersistentIndex in a way that could result on two
        // QPersistentModelIndex pointing to the same index.
        Q_UNUSED(removed);
    }
    // make sure our optimization still works
    for (int i = persistent.moved.size() - 1; i >= 0; --i) {
        int idx = persistent.moved.at(i).indexOf(data);
        if (idx >= 0)
            persistent.moved[i].remove(idx);
    }
    // update the references to invalidated persistent indexes
    for (int i = persistent.invalidated.size() - 1; i >= 0; --i) {
        int idx = persistent.invalidated.at(i).indexOf(data);
        if (idx >= 0)
            persistent.invalidated[i].remove(idx);
    }
 
}
 
void QAbstractItemModelPrivate::rowsAboutToBeInserted(const QModelIndex &parent,
                                                      int first, int last)
{
    Q_Q(QAbstractItemModel);
    Q_UNUSED(last);
    QList<QPersistentModelIndexData *> persistent_moved;
    if (first < q->rowCount(parent)) {
        for (auto *data : std::as_const(persistent.indexes)) {
            const QModelIndex &index = data->index;
            if (index.row() >= first && index.isValid() && index.parent() == parent) {
                persistent_moved.append(data);
            }
        }
    }
    persistent.moved.push(persistent_moved);
}
 
void QAbstractItemModelPrivate::rowsInserted(const QModelIndex &parent,
                                             int first, int last)
{
    const QList<QPersistentModelIndexData *> persistent_moved = persistent.moved.pop();
    const int count = (last - first) + 1; // it is important to only use the delta, because the change could be nested
    for (auto *data : persistent_moved) {
        QModelIndex old = data->index;
        persistent.indexes.erase(persistent.indexes.constFind(old));
        data->index = q_func()->index(old.row() + count, old.column(), parent);
        if (data->index.isValid()) {
            persistent.insertMultiAtEnd(data->index, data);
        } else {
            qWarning() << "QAbstractItemModel::endInsertRows:  Invalid index (" << old.row() + count << ',' << old.column() << ") in model" << q_func();
        }
    }
}
 
void QAbstractItemModelPrivate::itemsAboutToBeMoved(const QModelIndex &srcParent, int srcFirst, int srcLast, const QModelIndex &destinationParent, int destinationChild, Qt::Orientation orientation)
{
    QList<QPersistentModelIndexData *> persistent_moved_explicitly;
    QList<QPersistentModelIndexData *> persistent_moved_in_source;
    QList<QPersistentModelIndexData *> persistent_moved_in_destination;
 
    const bool sameParent = (srcParent == destinationParent);
    const bool movingUp = (srcFirst > destinationChild);
 
    for (auto *data : std::as_const(persistent.indexes)) {
        const QModelIndex &index = data->index;
        const QModelIndex &parent = index.parent();
        const bool isSourceIndex = (parent == srcParent);
        const bool isDestinationIndex = (parent == destinationParent);
 
        int childPosition;
        if (orientation == Qt::Vertical)
            childPosition = index.row();
        else
            childPosition = index.column();
 
        if (!index.isValid() || !(isSourceIndex || isDestinationIndex ) )
            continue;
 
        if (!sameParent && isDestinationIndex) {
            if (childPosition >= destinationChild)
                persistent_moved_in_destination.append(data);
            continue;
        }
 
        if (sameParent && movingUp && childPosition < destinationChild)
            continue;
 
        if (sameParent && !movingUp && childPosition < srcFirst )
            continue;
 
        if (!sameParent && childPosition < srcFirst)
            continue;
 
        if (sameParent && (childPosition > srcLast) && (childPosition >= destinationChild ))
            continue;
 
        if ((childPosition <= srcLast) && (childPosition >= srcFirst)) {
            persistent_moved_explicitly.append(data);
        } else {
            persistent_moved_in_source.append(data);
        }
    }
    persistent.moved.push(persistent_moved_explicitly);
    persistent.moved.push(persistent_moved_in_source);
    persistent.moved.push(persistent_moved_in_destination);
}
 
void QAbstractItemModelPrivate::movePersistentIndexes(const QList<QPersistentModelIndexData *> &indexes, int change,
                                                      const QModelIndex &parent, Qt::Orientation orientation)
{
    for (auto *data : indexes) {
        int row = data->index.row();
        int column = data->index.column();
 
        if (Qt::Vertical == orientation)
            row += change;
        else
            column += change;
 
        persistent.indexes.erase(persistent.indexes.constFind(data->index));
        data->index = q_func()->index(row, column, parent);
        if (data->index.isValid()) {
            persistent.insertMultiAtEnd(data->index, data);
        } else {
            qWarning() << "QAbstractItemModel::endMoveRows:  Invalid index (" << row << "," << column << ") in model" << q_func();
        }
    }
}
 
void QAbstractItemModelPrivate::itemsMoved(const QModelIndex &sourceParent, int sourceFirst, int sourceLast, const QModelIndex &destinationParent, int destinationChild, Qt::Orientation orientation)
{
    const QList<QPersistentModelIndexData *> moved_in_destination = persistent.moved.pop();
    const QList<QPersistentModelIndexData *> moved_in_source = persistent.moved.pop();
    const QList<QPersistentModelIndexData *> moved_explicitly = persistent.moved.pop();
 
    const bool sameParent = (sourceParent == destinationParent);
    const bool movingUp = (sourceFirst > destinationChild);
 
    const int explicit_change = (!sameParent || movingUp) ? destinationChild - sourceFirst : destinationChild - sourceLast - 1 ;
    const int source_change = (!sameParent || !movingUp) ? -1*(sourceLast - sourceFirst + 1) : sourceLast - sourceFirst + 1 ;
    const int destination_change = sourceLast - sourceFirst + 1;
 
    movePersistentIndexes(moved_explicitly, explicit_change, destinationParent, orientation);
    movePersistentIndexes(moved_in_source, source_change, sourceParent, orientation);
    movePersistentIndexes(moved_in_destination, destination_change, destinationParent, orientation);
}
 
void QAbstractItemModelPrivate::rowsAboutToBeRemoved(const QModelIndex &parent,
                                                     int first, int last)
{
    QList<QPersistentModelIndexData *> persistent_moved;
    QList<QPersistentModelIndexData *> persistent_invalidated;
    // find the persistent indexes that are affected by the change, either by being in the removed subtree
    // or by being on the same level and below the removed rows
    for (auto *data : std::as_const(persistent.indexes)) {
        bool level_changed = false;
        QModelIndex current = data->index;
        while (current.isValid()) {
            QModelIndex current_parent = current.parent();
            if (current_parent == parent) { // on the same level as the change
                if (!level_changed && current.row() > last) // below the removed rows
                    persistent_moved.append(data);
                else if (current.row() <= last && current.row() >= first) // in the removed subtree
                    persistent_invalidated.append(data);
                break;
            }
            current = current_parent;
            level_changed = true;
        }
    }
 
    persistent.moved.push(persistent_moved);
    persistent.invalidated.push(persistent_invalidated);
}
 
void QAbstractItemModelPrivate::rowsRemoved(const QModelIndex &parent,
                                            int first, int last)
{
    const QList<QPersistentModelIndexData *> persistent_moved = persistent.moved.pop();
    const int count = (last - first) + 1; // it is important to only use the delta, because the change could be nested
    for (auto *data : persistent_moved) {
        QModelIndex old = data->index;
        persistent.indexes.erase(persistent.indexes.constFind(old));
        data->index = q_func()->index(old.row() - count, old.column(), parent);
        if (data->index.isValid()) {
            persistent.insertMultiAtEnd(data->index, data);
        } else {
            qWarning() << "QAbstractItemModel::endRemoveRows:  Invalid index (" << old.row() - count << ',' << old.column() << ") in model" << q_func();
        }
    }
    const QList<QPersistentModelIndexData *> persistent_invalidated = persistent.invalidated.pop();
    for (auto *data : persistent_invalidated) {
        auto pit = persistent.indexes.constFind(data->index);
        if (pit != persistent.indexes.cend())
            persistent.indexes.erase(pit);
        data->index = QModelIndex();
    }
}
 
void QAbstractItemModelPrivate::columnsAboutToBeInserted(const QModelIndex &parent,
                                                         int first, int last)
{
    Q_Q(QAbstractItemModel);
    Q_UNUSED(last);
    QList<QPersistentModelIndexData *> persistent_moved;
    if (first < q->columnCount(parent)) {
        for (auto *data : std::as_const(persistent.indexes)) {
            const QModelIndex &index = data->index;
            if (index.column() >= first && index.isValid() && index.parent() == parent)
                persistent_moved.append(data);
        }
    }
    persistent.moved.push(persistent_moved);
}
 
void QAbstractItemModelPrivate::columnsInserted(const QModelIndex &parent,
                                                int first, int last)
{
    const QList<QPersistentModelIndexData *> persistent_moved = persistent.moved.pop();
    const int count = (last - first) + 1; // it is important to only use the delta, because the change could be nested
    for (auto *data : persistent_moved) {
        QModelIndex old = data->index;
        persistent.indexes.erase(persistent.indexes.constFind(old));
        data->index = q_func()->index(old.row(), old.column() + count, parent);
        if (data->index.isValid()) {
            persistent.insertMultiAtEnd(data->index, data);
        } else {
            qWarning() << "QAbstractItemModel::endInsertColumns:  Invalid index (" << old.row() << ',' << old.column() + count << ") in model" << q_func();
        }
    }
}
 
void QAbstractItemModelPrivate::columnsAboutToBeRemoved(const QModelIndex &parent,
                                                        int first, int last)
{
    QList<QPersistentModelIndexData *> persistent_moved;
    QList<QPersistentModelIndexData *> persistent_invalidated;
    // find the persistent indexes that are affected by the change, either by being in the removed subtree
    // or by being on the same level and to the right of the removed columns
    for (auto *data : std::as_const(persistent.indexes)) {
        bool level_changed = false;
        QModelIndex current = data->index;
        while (current.isValid()) {
            QModelIndex current_parent = current.parent();
            if (current_parent == parent) { // on the same level as the change
                if (!level_changed && current.column() > last) // right of the removed columns
                    persistent_moved.append(data);
                else if (current.column() <= last && current.column() >= first) // in the removed subtree
                    persistent_invalidated.append(data);
                break;
            }
            current = current_parent;
            level_changed = true;
        }
    }
 
    persistent.moved.push(persistent_moved);
    persistent.invalidated.push(persistent_invalidated);
 
}
 
void QAbstractItemModelPrivate::columnsRemoved(const QModelIndex &parent,
                                               int first, int last)
{
    const QList<QPersistentModelIndexData *> persistent_moved = persistent.moved.pop();
    const int count = (last - first) + 1; // it is important to only use the delta, because the change could be nested
    for (auto *data : persistent_moved) {
        QModelIndex old = data->index;
        persistent.indexes.erase(persistent.indexes.constFind(old));
        data->index = q_func()->index(old.row(), old.column() - count, parent);
        if (data->index.isValid()) {
            persistent.insertMultiAtEnd(data->index, data);
        } else {
            qWarning() << "QAbstractItemModel::endRemoveColumns:  Invalid index (" << old.row() << ',' << old.column() - count << ") in model" << q_func();
        }
    }
    const QList<QPersistentModelIndexData *> persistent_invalidated = persistent.invalidated.pop();
    for (auto *data : persistent_invalidated) {
        auto index = persistent.indexes.constFind(data->index);
        if (index != persistent.indexes.constEnd())
            persistent.indexes.erase(index);
        data->index = QModelIndex();
    }
}
 
void QAbstractItemModel::resetInternalData()
{
 
}
 
QAbstractItemModel::QAbstractItemModel(QObject *parent)
    : QObject(*new QAbstractItemModelPrivate, parent)
{
}
 
QAbstractItemModel::QAbstractItemModel(QAbstractItemModelPrivate &dd, QObject *parent)
    : QObject(dd, parent)
{
}
 
QAbstractItemModel::~QAbstractItemModel()
{
    d_func()->invalidatePersistentIndexes();
}
 
 
bool QAbstractItemModel::hasIndex(int row, int column, const QModelIndex &parent) const
{
    if (row < 0 || column < 0)
        return false;
    return row < rowCount(parent) && column < columnCount(parent);
}
 
 
bool QAbstractItemModel::hasChildren(const QModelIndex &parent) const
{
    return (rowCount(parent) > 0) && (columnCount(parent) > 0);
}
 
QModelIndex QAbstractItemModel::sibling(int row, int column, const QModelIndex &idx) const
{
    return (row == idx.row() && column == idx.column()) ? idx : index(row, column, parent(idx));
}
 
 
QMap<int, QVariant> QAbstractItemModel::itemData(const QModelIndex &index) const
{
    QMap<int, QVariant> roles;
    for (int i = 0; i < Qt::UserRole; ++i) {
        QVariant variantData = data(index, i);
        if (variantData.isValid())
            roles.insert(i, variantData);
    }
    return roles;
}
 
bool QAbstractItemModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    Q_UNUSED(index);
    Q_UNUSED(value);
    Q_UNUSED(role);
    return false;
}
 
bool QAbstractItemModel::clearItemData(const QModelIndex &index)
{
    Q_UNUSED(index);
    return false;
}
 
bool QAbstractItemModel::setItemData(const QModelIndex &index, const QMap<int, QVariant> &roles)
{
    // ### TODO: Consider change the semantics of this function,
    // or deprecating/removing it altogether.
    //
    // For instance, it should try setting *all* the data
    // in \a roles, and not bail out at the first setData that returns
    // false. It should also have a transactional approach.
    for (auto it = roles.begin(), e = roles.end(); it != e; ++it) {
        if (!setData(index, it.value(), it.key()))
            return false;
    }
    return true;
}
 
QStringList QAbstractItemModel::mimeTypes() const
{
    QStringList types;
    types << QStringLiteral("application/x-qabstractitemmodeldatalist");
    return types;
}
 
QMimeData *QAbstractItemModel::mimeData(const QModelIndexList &indexes) const
{
    if (indexes.size() <= 0)
        return nullptr;
    QStringList types = mimeTypes();
    if (types.isEmpty())
        return nullptr;
    QMimeData *data = new QMimeData();
    QString format = types.at(0);
    QByteArray encoded;
    QDataStream stream(&encoded, QDataStream::WriteOnly);
    encodeData(indexes, stream);
    data->setData(format, encoded);
    return data;
}
 
bool QAbstractItemModel::canDropMimeData(const QMimeData *data, Qt::DropAction action,
                                         int row, int column,
                                         const QModelIndex &parent) const
{
    Q_UNUSED(row);
    Q_UNUSED(column);
    Q_UNUSED(parent);
 
    if (!(action & supportedDropActions()))
        return false;
 
    const QStringList modelTypes = mimeTypes();
    for (int i = 0; i < modelTypes.size(); ++i) {
        if (data->hasFormat(modelTypes.at(i)))
            return true;
    }
    return false;
}
 
bool QAbstractItemModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                                      int row, int column, const QModelIndex &parent)
{
    // check if the action is supported
    if (!data || !(action == Qt::CopyAction || action == Qt::MoveAction))
        return false;
    // check if the format is supported
    QStringList types = mimeTypes();
    if (types.isEmpty())
        return false;
    QString format = types.at(0);
    if (!data->hasFormat(format))
        return false;
    if (row > rowCount(parent))
        row = rowCount(parent);
    if (row == -1)
        row = rowCount(parent);
    if (column == -1)
        column = 0;
    // decode and insert
    QByteArray encoded = data->data(format);
    QDataStream stream(&encoded, QDataStream::ReadOnly);
    return decodeData(row, column, parent, stream);
}
 
Qt::DropActions QAbstractItemModel::supportedDropActions() const
{
    return Qt::CopyAction;
}
 
Qt::DropActions QAbstractItemModel::supportedDragActions() const
{
    return supportedDropActions();
}
 
bool QAbstractItemModel::insertRows(int, int, const QModelIndex &)
{
    return false;
}
 
bool QAbstractItemModel::insertColumns(int, int, const QModelIndex &)
{
    return false;
}
 
bool QAbstractItemModel::removeRows(int, int, const QModelIndex &)
{
    return false;
}
 
bool QAbstractItemModel::removeColumns(int, int, const QModelIndex &)
{
    return false;
}
 
bool QAbstractItemModel::moveRows(const QModelIndex &, int , int , const QModelIndex &, int)
{
    return false;
}
 
bool QAbstractItemModel::moveColumns(const QModelIndex &, int , int , const QModelIndex &, int)
{
    return false;
}
 
void QAbstractItemModel::fetchMore(const QModelIndex &)
{
    // do nothing
}
 
bool QAbstractItemModel::canFetchMore(const QModelIndex &) const
{
    return false;
}
 
Qt::ItemFlags QAbstractItemModel::flags(const QModelIndex &index) const
{
    Q_D(const QAbstractItemModel);
    if (!d->indexValid(index))
        return { };
 
    return Qt::ItemIsSelectable|Qt::ItemIsEnabled;
}
 
void QAbstractItemModel::sort(int column, Qt::SortOrder order)
{
    Q_UNUSED(column);
    Q_UNUSED(order);
    // do nothing
}
 
QModelIndex QAbstractItemModel::buddy(const QModelIndex &index) const
{
    return index;
}
 
QModelIndexList QAbstractItemModel::match(const QModelIndex &start, int role,
                                          const QVariant &value, int hits,
                                          Qt::MatchFlags flags) const
{
    QModelIndexList result;
    uint matchType = (flags & Qt::MatchTypeMask).toInt();
    Qt::CaseSensitivity cs = flags & Qt::MatchCaseSensitive ? Qt::CaseSensitive : Qt::CaseInsensitive;
    bool recurse = flags.testAnyFlag(Qt::MatchRecursive);
    bool wrap = flags.testAnyFlag(Qt::MatchWrap);
    bool allHits = (hits == -1);
    QString text; // only convert to a string if it is needed
#if QT_CONFIG(regularexpression)
    QRegularExpression rx; // only create it if needed
#endif
    const int column = start.column();
    QModelIndex p = parent(start);
    int from = start.row();
    int to = rowCount(p);
 
    // iterates twice if wrapping
    for (int i = 0; (wrap && i < 2) || (!wrap && i < 1); ++i) {
        for (int r = from; (r < to) && (allHits || result.size() < hits); ++r) {
            QModelIndex idx = index(r, column, p);
            if (!idx.isValid())
                 continue;
            QVariant v = data(idx, role);
            // QVariant based matching
            if (matchType == Qt::MatchExactly) {
                if (value == v)
                    result.append(idx);
            } else { // QString or regular expression based matching
#if QT_CONFIG(regularexpression)
                if (matchType == Qt::MatchRegularExpression) {
                    if (rx.pattern().isEmpty()) {
                        if (value.userType() == QMetaType::QRegularExpression) {
                            rx = value.toRegularExpression();
                        } else {
                            rx.setPattern(value.toString());
                            if (cs == Qt::CaseInsensitive)
                                rx.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
                        }
                    }
                } else if (matchType == Qt::MatchWildcard) {
                    if (rx.pattern().isEmpty()) {
                        const QString pattern = QRegularExpression::wildcardToRegularExpression(value.toString(), QRegularExpression::NonPathWildcardConversion);
                        rx.setPattern(pattern);
                    }
                    if (cs == Qt::CaseInsensitive)
                        rx.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
                } else
#endif
                {
                    if (text.isEmpty()) // lazy conversion
                        text = value.toString();
                }
 
                QString t = v.toString();
                switch (matchType) {
#if QT_CONFIG(regularexpression)
                case Qt::MatchRegularExpression:
                    Q_FALLTHROUGH();
                case Qt::MatchWildcard:
                    if (t.contains(rx))
                        result.append(idx);
                    break;
#endif
                case Qt::MatchStartsWith:
                    if (t.startsWith(text, cs))
                        result.append(idx);
                    break;
                case Qt::MatchEndsWith:
                    if (t.endsWith(text, cs))
                        result.append(idx);
                    break;
                case Qt::MatchFixedString:
                    if (t.compare(text, cs) == 0)
                        result.append(idx);
                    break;
                case Qt::MatchContains:
                default:
                    if (t.contains(text, cs))
                        result.append(idx);
                }
            }
            if (recurse) {
                const auto parent = column != 0 ? idx.sibling(idx.row(), 0) : idx;
                if (hasChildren(parent)) { // search the hierarchy
                    result += match(index(0, column, parent), role,
                                    (text.isEmpty() ? value : text),
                                    (allHits ? -1 : hits - result.size()), flags);
                }
            }
        }
        // prepare for the next iteration
        from = 0;
        to = start.row();
    }
    return result;
}
 
QSize QAbstractItemModel::span(const QModelIndex &) const
{
    return QSize(1, 1);
}
 
QHash<int,QByteArray> QAbstractItemModel::roleNames() const
{
    return QAbstractItemModelPrivate::defaultRoleNames();
}
 
bool QAbstractItemModel::submit()
{
    return true;
}
 
void QAbstractItemModel::revert()
{
    // do nothing
}
 
QVariant QAbstractItemModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    Q_UNUSED(orientation);
    if (role == Qt::DisplayRole)
        return section + 1;
    return QVariant();
}
 
bool QAbstractItemModel::setHeaderData(int section, Qt::Orientation orientation,
                                       const QVariant &value, int role)
{
    Q_UNUSED(section);
    Q_UNUSED(orientation);
    Q_UNUSED(value);
    Q_UNUSED(role);
    return false;
}
 
void QAbstractItemModel::encodeData(const QModelIndexList &indexes, QDataStream &stream) const
{
    for (const auto &index : indexes)
        stream << index.row() << index.column() << itemData(index);
}
 
bool QAbstractItemModel::decodeData(int row, int column, const QModelIndex &parent,
                                    QDataStream &stream)
{
    int top = INT_MAX;
    int left = INT_MAX;
    int bottom = 0;
    int right = 0;
    QList<int> rows, columns;
    QList<QMap<int, QVariant>> data;
 
    while (!stream.atEnd()) {
        int r, c;
        QMap<int, QVariant> v;
        stream >> r >> c >> v;
        rows.append(r);
        columns.append(c);
        data.append(v);
        top = qMin(r, top);
        left = qMin(c, left);
        bottom = qMax(r, bottom);
        right = qMax(c, right);
    }
 
    // insert the dragged items into the table, use a bit array to avoid overwriting items,
    // since items from different tables can have the same row and column
    int dragRowCount = 0;
    int dragColumnCount = right - left + 1;
 
    // Compute the number of continuous rows upon insertion and modify the rows to match
    QList<int> rowsToInsert(bottom + 1);
    for (int i = 0; i < rows.size(); ++i)
        rowsToInsert[rows.at(i)] = 1;
    for (int i = 0; i < rowsToInsert.size(); ++i) {
        if (rowsToInsert.at(i) == 1){
            rowsToInsert[i] = dragRowCount;
            ++dragRowCount;
        }
    }
    for (int i = 0; i < rows.size(); ++i)
        rows[i] = top + rowsToInsert.at(rows.at(i));
 
    QBitArray isWrittenTo(dragRowCount * dragColumnCount);
 
    // make space in the table for the dropped data
    int colCount = columnCount(parent);
    if (colCount == 0) {
        insertColumns(colCount, dragColumnCount - colCount, parent);
        colCount = columnCount(parent);
    }
    insertRows(row, dragRowCount, parent);
 
    row = qMax(0, row);
    column = qMax(0, column);
 
    QList<QPersistentModelIndex> newIndexes(data.size());
    // set the data in the table
    for (int j = 0; j < data.size(); ++j) {
        int relativeRow = rows.at(j) - top;
        int relativeColumn = columns.at(j) - left;
        int destinationRow = relativeRow + row;
        int destinationColumn = relativeColumn + column;
        int flat = (relativeRow * dragColumnCount) + relativeColumn;
        // if the item was already written to, or we just can't fit it in the table, create a new row
        if (destinationColumn >= colCount || isWrittenTo.testBit(flat)) {
            destinationColumn = qBound(column, destinationColumn, colCount - 1);
            destinationRow = row + dragRowCount;
            insertRows(row + dragRowCount, 1, parent);
            flat = (dragRowCount * dragColumnCount) + relativeColumn;
            isWrittenTo.resize(++dragRowCount * dragColumnCount);
        }
        if (!isWrittenTo.testBit(flat)) {
            newIndexes[j] = index(destinationRow, destinationColumn, parent);
            isWrittenTo.setBit(flat);
        }
    }
 
    for(int k = 0; k < newIndexes.size(); k++) {
        if (newIndexes.at(k).isValid())
            setItemData(newIndexes.at(k), data.at(k));
    }
 
    return true;
}
 
void QAbstractItemModel::beginInsertRows(const QModelIndex &parent, int first, int last)
{
    Q_ASSERT(first >= 0);
    Q_ASSERT(first <= rowCount(parent)); // == is allowed, to insert at the end
    Q_ASSERT(last >= first);
    Q_D(QAbstractItemModel);
    d->changes.push(QAbstractItemModelPrivate::Change(parent, first, last));
    emit rowsAboutToBeInserted(parent, first, last, QPrivateSignal());
    d->rowsAboutToBeInserted(parent, first, last);
}
 
void QAbstractItemModel::endInsertRows()
{
    Q_D(QAbstractItemModel);
    QAbstractItemModelPrivate::Change change = d->changes.pop();
    d->rowsInserted(change.parent, change.first, change.last);
    emit rowsInserted(change.parent, change.first, change.last, QPrivateSignal());
}
 
void QAbstractItemModel::beginRemoveRows(const QModelIndex &parent, int first, int last)
{
    Q_ASSERT(first >= 0);
    Q_ASSERT(last >= first);
    Q_ASSERT(last < rowCount(parent));
    Q_D(QAbstractItemModel);
    d->changes.push(QAbstractItemModelPrivate::Change(parent, first, last));
    emit rowsAboutToBeRemoved(parent, first, last, QPrivateSignal());
    d->rowsAboutToBeRemoved(parent, first, last);
}
 
void QAbstractItemModel::endRemoveRows()
{
    Q_D(QAbstractItemModel);
    QAbstractItemModelPrivate::Change change = d->changes.pop();
    d->rowsRemoved(change.parent, change.first, change.last);
    emit rowsRemoved(change.parent, change.first, change.last, QPrivateSignal());
}
 
bool QAbstractItemModelPrivate::allowMove(const QModelIndex &srcParent, int start, int end, const QModelIndex &destinationParent, int destinationStart, Qt::Orientation orientation)
{
    // Don't move the range within itself.
    if (destinationParent == srcParent)
        return !(destinationStart >= start && destinationStart <= end + 1);
 
    QModelIndex destinationAncestor = destinationParent;
    int pos = (Qt::Vertical == orientation) ? destinationAncestor.row() : destinationAncestor.column();
    forever {
        if (destinationAncestor == srcParent) {
            if (pos >= start && pos <= end)
                return false;
            break;
        }
 
        if (!destinationAncestor.isValid())
          break;
 
        pos = (Qt::Vertical == orientation) ? destinationAncestor.row() : destinationAncestor.column();
        destinationAncestor = destinationAncestor.parent();
    }
 
    return true;
}
 
void QAbstractItemModelPrivate::executePendingOperations() const { }
 
bool QAbstractItemModel::beginMoveRows(const QModelIndex &sourceParent, int sourceFirst, int sourceLast, const QModelIndex &destinationParent, int destinationChild)
{
    Q_ASSERT(sourceFirst >= 0);
    Q_ASSERT(sourceLast >= sourceFirst);
    Q_ASSERT(destinationChild >= 0);
    Q_D(QAbstractItemModel);
 
    if (!d->allowMove(sourceParent, sourceFirst, sourceLast, destinationParent, destinationChild, Qt::Vertical)) {
        return false;
    }
 
    QAbstractItemModelPrivate::Change sourceChange(sourceParent, sourceFirst, sourceLast);
    sourceChange.needsAdjust = sourceParent.isValid() && sourceParent.row() >= destinationChild && sourceParent.parent() == destinationParent;
    d->changes.push(sourceChange);
    int destinationLast = destinationChild + (sourceLast - sourceFirst);
    QAbstractItemModelPrivate::Change destinationChange(destinationParent, destinationChild, destinationLast);
    destinationChange.needsAdjust = destinationParent.isValid() && destinationParent.row() >= sourceLast && destinationParent.parent() == sourceParent;
    d->changes.push(destinationChange);
 
    emit rowsAboutToBeMoved(sourceParent, sourceFirst, sourceLast, destinationParent, destinationChild, QPrivateSignal());
    d->itemsAboutToBeMoved(sourceParent, sourceFirst, sourceLast, destinationParent, destinationChild, Qt::Vertical);
    return true;
}
 
void QAbstractItemModel::endMoveRows()
{
    Q_D(QAbstractItemModel);
 
    QAbstractItemModelPrivate::Change insertChange = d->changes.pop();
    QAbstractItemModelPrivate::Change removeChange = d->changes.pop();
 
    QModelIndex adjustedSource = removeChange.parent;
    QModelIndex adjustedDestination = insertChange.parent;
 
    const int numMoved = removeChange.last - removeChange.first + 1;
    if (insertChange.needsAdjust)
      adjustedDestination = createIndex(adjustedDestination.row() - numMoved, adjustedDestination.column(), adjustedDestination.internalPointer());
 
    if (removeChange.needsAdjust)
      adjustedSource = createIndex(adjustedSource.row() + numMoved, adjustedSource.column(), adjustedSource.internalPointer());
 
    d->itemsMoved(adjustedSource, removeChange.first, removeChange.last, adjustedDestination, insertChange.first, Qt::Vertical);
 
    emit rowsMoved(adjustedSource, removeChange.first, removeChange.last, adjustedDestination, insertChange.first, QPrivateSignal());
}
 
void QAbstractItemModel::beginInsertColumns(const QModelIndex &parent, int first, int last)
{
    Q_ASSERT(first >= 0);
    Q_ASSERT(first <= columnCount(parent)); // == is allowed, to insert at the end
    Q_ASSERT(last >= first);
    Q_D(QAbstractItemModel);
    d->changes.push(QAbstractItemModelPrivate::Change(parent, first, last));
    emit columnsAboutToBeInserted(parent, first, last, QPrivateSignal());
    d->columnsAboutToBeInserted(parent, first, last);
}
 
void QAbstractItemModel::endInsertColumns()
{
    Q_D(QAbstractItemModel);
    QAbstractItemModelPrivate::Change change = d->changes.pop();
    d->columnsInserted(change.parent, change.first, change.last);
    emit columnsInserted(change.parent, change.first, change.last, QPrivateSignal());
}
 
void QAbstractItemModel::beginRemoveColumns(const QModelIndex &parent, int first, int last)
{
    Q_ASSERT(first >= 0);
    Q_ASSERT(last >= first);
    Q_ASSERT(last < columnCount(parent));
    Q_D(QAbstractItemModel);
    d->changes.push(QAbstractItemModelPrivate::Change(parent, first, last));
    emit columnsAboutToBeRemoved(parent, first, last, QPrivateSignal());
    d->columnsAboutToBeRemoved(parent, first, last);
}
 
void QAbstractItemModel::endRemoveColumns()
{
    Q_D(QAbstractItemModel);
    QAbstractItemModelPrivate::Change change = d->changes.pop();
    d->columnsRemoved(change.parent, change.first, change.last);
    emit columnsRemoved(change.parent, change.first, change.last, QPrivateSignal());
}
 
bool QAbstractItemModel::beginMoveColumns(const QModelIndex &sourceParent, int sourceFirst, int sourceLast, const QModelIndex &destinationParent, int destinationChild)
{
    Q_ASSERT(sourceFirst >= 0);
    Q_ASSERT(sourceLast >= sourceFirst);
    Q_ASSERT(destinationChild >= 0);
    Q_D(QAbstractItemModel);
 
    if (!d->allowMove(sourceParent, sourceFirst, sourceLast, destinationParent, destinationChild, Qt::Horizontal)) {
        return false;
    }
 
    QAbstractItemModelPrivate::Change sourceChange(sourceParent, sourceFirst, sourceLast);
    sourceChange.needsAdjust = sourceParent.isValid() && sourceParent.row() >= destinationChild && sourceParent.parent() == destinationParent;
    d->changes.push(sourceChange);
    int destinationLast = destinationChild + (sourceLast - sourceFirst);
    QAbstractItemModelPrivate::Change destinationChange(destinationParent, destinationChild, destinationLast);
    destinationChange.needsAdjust = destinationParent.isValid() && destinationParent.row() >= sourceLast && destinationParent.parent() == sourceParent;
    d->changes.push(destinationChange);
 
    emit columnsAboutToBeMoved(sourceParent, sourceFirst, sourceLast, destinationParent, destinationChild, QPrivateSignal());
    d->itemsAboutToBeMoved(sourceParent, sourceFirst, sourceLast, destinationParent, destinationChild, Qt::Horizontal);
    return true;
}
 
void QAbstractItemModel::endMoveColumns()
{
    Q_D(QAbstractItemModel);
 
    QAbstractItemModelPrivate::Change insertChange = d->changes.pop();
    QAbstractItemModelPrivate::Change removeChange = d->changes.pop();
 
    QModelIndex adjustedSource = removeChange.parent;
    QModelIndex adjustedDestination = insertChange.parent;
 
    const int numMoved = removeChange.last - removeChange.first + 1;
    if (insertChange.needsAdjust)
      adjustedDestination = createIndex(adjustedDestination.row(), adjustedDestination.column() - numMoved, adjustedDestination.internalPointer());
 
    if (removeChange.needsAdjust)
      adjustedSource = createIndex(adjustedSource.row(), adjustedSource.column() + numMoved, adjustedSource.internalPointer());
 
    d->itemsMoved(adjustedSource, removeChange.first, removeChange.last, adjustedDestination, insertChange.first, Qt::Horizontal);
    emit columnsMoved(adjustedSource, removeChange.first, removeChange.last, adjustedDestination, insertChange.first, QPrivateSignal());
}
 
void QAbstractItemModel::beginResetModel()
{
    emit modelAboutToBeReset(QPrivateSignal());
}
 
void QAbstractItemModel::endResetModel()
{
    Q_D(QAbstractItemModel);
    d->invalidatePersistentIndexes();
    resetInternalData();
    emit modelReset(QPrivateSignal());
}
 
void QAbstractItemModel::changePersistentIndex(const QModelIndex &from, const QModelIndex &to)
{
    Q_D(QAbstractItemModel);
    if (d->persistent.indexes.isEmpty())
        return;
    // find the data and reinsert it sorted
    const auto it = d->persistent.indexes.constFind(from);
    if (it != d->persistent.indexes.cend()) {
        QPersistentModelIndexData *data = *it;
        d->persistent.indexes.erase(it);
        data->index = to;
        if (to.isValid())
            d->persistent.insertMultiAtEnd(to, data);
    }
}
 
void QAbstractItemModel::changePersistentIndexList(const QModelIndexList &from,
                                                   const QModelIndexList &to)
{
    Q_D(QAbstractItemModel);
    if (d->persistent.indexes.isEmpty())
        return;
    QList<QPersistentModelIndexData *> toBeReinserted;
    toBeReinserted.reserve(to.size());
    for (int i = 0; i < from.size(); ++i) {
        if (from.at(i) == to.at(i))
            continue;
        const auto it = d->persistent.indexes.constFind(from.at(i));
        if (it != d->persistent.indexes.cend()) {
            QPersistentModelIndexData *data = *it;
            d->persistent.indexes.erase(it);
            data->index = to.at(i);
            if (data->index.isValid())
                toBeReinserted << data;
        }
    }
 
    for (auto *data : std::as_const(toBeReinserted))
        d->persistent.insertMultiAtEnd(data->index, data);
}
 
QModelIndexList QAbstractItemModel::persistentIndexList() const
{
    Q_D(const QAbstractItemModel);
    QModelIndexList result;
    result.reserve(d->persistent.indexes.size());
    for (auto *data : std::as_const(d->persistent.indexes))
        result.append(data->index);
    return result;
}
 
bool QAbstractItemModel::checkIndex(const QModelIndex &index, CheckIndexOptions options) const
{
    if (!index.isValid()) {
        if (options & CheckIndexOption::IndexIsValid) {
            qCWarning(lcCheckIndex) << "Index" << index << "is not valid (expected valid)";
            return false;
        }
        return true;
    }
 
    if (index.model() != this) {
        qCWarning(lcCheckIndex) << "Index" << index
                                << "is for model" << index.model()
                                << "which is different from this model" << this;
        return false;
    }
 
    if (index.row() < 0) {
        qCWarning(lcCheckIndex) << "Index" << index
                                << "has negative row" << index.row();
        return false;
    }
 
    if (index.column() < 0) {
        qCWarning(lcCheckIndex) << "Index" << index
                                << "has negative column" << index.column();
        return false;
    }
 
    if (!(options & CheckIndexOption::DoNotUseParent)) {
        const QModelIndex parentIndex = index.parent();
        if (options & CheckIndexOption::ParentIsInvalid) {
            if (parentIndex.isValid()) {
                qCWarning(lcCheckIndex) << "Index" << index
                                        << "has valid parent" << parentIndex
                                        << "(expected an invalid parent)";
                return false;
            }
        }
 
        const int rc = rowCount(parentIndex);
        if (index.row() >= rc) {
            qCWarning(lcCheckIndex) << "Index" << index
                                    << "has out of range row" << index.row()
                                    << "rowCount() is" << rc;
            return false;
        }
 
        const int cc = columnCount(parentIndex);
        if (index.column() >= cc) {
            qCWarning(lcCheckIndex) << "Index" << index
                                    << "has out of range column" << index.column()
                                    << "columnCount() is" << cc;
            return false;
 
        }
    }
 
    return true;
}
 
void QAbstractItemModel::multiData(const QModelIndex &index, QModelRoleDataSpan roleDataSpan) const
{
    Q_ASSERT(checkIndex(index, CheckIndexOption::IndexIsValid));
 
    for (QModelRoleData &d : roleDataSpan)
        d.setData(data(index, d.role()));
}
 
QAbstractTableModel::QAbstractTableModel(QObject *parent)
    : QAbstractItemModel(parent)
{
 
}
 
QAbstractTableModel::QAbstractTableModel(QAbstractItemModelPrivate &dd, QObject *parent)
    : QAbstractItemModel(dd, parent)
{
 
}
 
QAbstractTableModel::~QAbstractTableModel()
{
 
}
 
QModelIndex QAbstractTableModel::index(int row, int column, const QModelIndex &parent) const
{
    return hasIndex(row, column, parent) ? createIndex(row, column) : QModelIndex();
}
 
QModelIndex QAbstractTableModel::parent(const QModelIndex &) const
{
    return QModelIndex();
}
 
QModelIndex QAbstractTableModel::sibling(int row, int column, const QModelIndex &) const
{
    return index(row, column);
}
 
bool QAbstractTableModel::hasChildren(const QModelIndex &parent) const
{
    if (!parent.isValid())
        return rowCount(parent) > 0 && columnCount(parent) > 0;
    return false;
}
 
Qt::ItemFlags QAbstractTableModel::flags(const QModelIndex &index) const
{
    Qt::ItemFlags f = QAbstractItemModel::flags(index);
    if (index.isValid())
        f |= Qt::ItemNeverHasChildren;
    return f;
}
 
QAbstractListModel::QAbstractListModel(QObject *parent)
    : QAbstractItemModel(parent)
{
 
}
 
QAbstractListModel::QAbstractListModel(QAbstractItemModelPrivate &dd, QObject *parent)
    : QAbstractItemModel(dd, parent)
{
 
}
 
QAbstractListModel::~QAbstractListModel()
{
 
}
 
QModelIndex QAbstractListModel::index(int row, int column, const QModelIndex &parent) const
{
    return hasIndex(row, column, parent) ? createIndex(row, column) : QModelIndex();
}
 
QModelIndex QAbstractListModel::parent(const QModelIndex & /* index */) const
{
    return QModelIndex();
}
 
QModelIndex QAbstractListModel::sibling(int row, int column, const QModelIndex &) const
{
    return index(row, column);
}
 
Qt::ItemFlags QAbstractListModel::flags(const QModelIndex &index) const
{
    Qt::ItemFlags f = QAbstractItemModel::flags(index);
    if (index.isValid())
        f |= Qt::ItemNeverHasChildren;
    return f;
}
 
int QAbstractListModel::columnCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : 1;
}
 
bool QAbstractListModel::hasChildren(const QModelIndex &parent) const
{
    return parent.isValid() ? false : (rowCount() > 0);
}
 
bool QAbstractTableModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                                       int row, int column, const QModelIndex &parent)
{
    if (!data || !(action == Qt::CopyAction || action == Qt::MoveAction))
        return false;
 
    QStringList types = mimeTypes();
    if (types.isEmpty())
        return false;
    QString format = types.at(0);
    if (!data->hasFormat(format))
        return false;
 
    QByteArray encoded = data->data(format);
    QDataStream stream(&encoded, QDataStream::ReadOnly);
 
    // if the drop is on an item, replace the data in the items
    if (parent.isValid() && row == -1 && column == -1) {
        int top = INT_MAX;
        int left = INT_MAX;
        QList<int> rows, columns;
        QList<QMap<int, QVariant>> data;
 
        while (!stream.atEnd()) {
            int r, c;
            QMap<int, QVariant> v;
            stream >> r >> c >> v;
            rows.append(r);
            columns.append(c);
            data.append(v);
            top = qMin(r, top);
            left = qMin(c, left);
        }
 
        for (int i = 0; i < data.size(); ++i) {
            int r = (rows.at(i) - top) + parent.row();
            int c = (columns.at(i) - left) + parent.column();
            if (hasIndex(r, c))
                setItemData(index(r, c), data.at(i));
        }
 
        return true;
    }
 
    // otherwise insert new rows for the data
    return decodeData(row, column, parent, stream);
}
 
bool QAbstractListModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                                      int row, int column, const QModelIndex &parent)
{
    if (!data || !(action == Qt::CopyAction || action == Qt::MoveAction))
        return false;
 
    QStringList types = mimeTypes();
    if (types.isEmpty())
        return false;
    QString format = types.at(0);
    if (!data->hasFormat(format))
        return false;
 
    QByteArray encoded = data->data(format);
    QDataStream stream(&encoded, QDataStream::ReadOnly);
 
    // if the drop is on an item, replace the data in the items
    if (parent.isValid() && row == -1 && column == -1) {
        int top = INT_MAX;
        int left = INT_MAX;
        QList<int> rows, columns;
        QList<QMap<int, QVariant>> data;
 
        while (!stream.atEnd()) {
            int r, c;
            QMap<int, QVariant> v;
            stream >> r >> c >> v;
            rows.append(r);
            columns.append(c);
            data.append(v);
            top = qMin(r, top);
            left = qMin(c, left);
        }
 
        for (int i = 0; i < data.size(); ++i) {
            int r = (rows.at(i) - top) + parent.row();
            if (columns.at(i) == left && hasIndex(r, 0))
                setItemData(index(r), data.at(i));
        }
 
        return true;
    }
 
    if (row == -1)
        row = rowCount(parent);
 
    // otherwise insert new rows for the data
    return decodeData(row, column, parent, stream);
}
 
void QAbstractItemModelPrivate::Persistent::insertMultiAtEnd(const QModelIndex& key, QPersistentModelIndexData *data)
{
    auto newIt = indexes.insert(key, data);
    auto it = newIt;
    ++it;
    while (it != indexes.end() && it.key() == key) {
        qSwap(*newIt,*it);
        newIt = it;
        ++it;
    }
}
 
QT_END_NAMESPACE
 
#include "moc_qabstractitemmodel.cpp"