qlistwidget.cpp

Go to the documentation of this file.

// Copyright (C) 2016 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 "qlistwidget.h"
 
#include <qitemdelegate.h>
#include <private/qlistview_p.h>
#include <private/qwidgetitemdata_p.h>
#include <private/qlistwidget_p.h>
 
#include <algorithm>
 
QT_BEGIN_NAMESPACE
 
class QListWidgetMimeData : public QMimeData
{
    Q_OBJECT
public:
    QList<QListWidgetItem*> items;
};
 
QT_BEGIN_INCLUDE_NAMESPACE
#include "qlistwidget.moc"
QT_END_INCLUDE_NAMESPACE
 
QListModel::QListModel(QListWidget *parent)
    : QAbstractListModel(parent)
{
}
 
QListModel::~QListModel()
{
    clear();
}
 
void QListModel::clear()
{
    beginResetModel();
    for (int i = 0; i < items.size(); ++i) {
        if (items.at(i)) {
            items.at(i)->d->theid = -1;
            items.at(i)->view = nullptr;
            delete items.at(i);
        }
    }
    items.clear();
    endResetModel();
}
 
QListWidgetItem *QListModel::at(int row) const
{
    return items.value(row);
}
 
void QListModel::remove(QListWidgetItem *item)
{
    if (!item)
        return;
    int row = items.indexOf(item); // ### use index(item) - it's faster
    Q_ASSERT(row != -1);
    beginRemoveRows(QModelIndex(), row, row);
    items.at(row)->d->theid = -1;
    items.at(row)->view = nullptr;
    items.removeAt(row);
    endRemoveRows();
}
 
void QListModel::insert(int row, QListWidgetItem *item)
{
    if (!item)
        return;
 
    item->view = qobject_cast<QListWidget*>(QObject::parent());
    if (item->view && item->view->isSortingEnabled()) {
        // sorted insertion
        QList<QListWidgetItem*>::iterator it;
        it = sortedInsertionIterator(items.begin(), items.end(),
                                     item->view->sortOrder(), item);
        row = qMax<qsizetype>(it - items.begin(), 0);
    } else {
        if (row < 0)
            row = 0;
        else if (row > items.size())
            row = items.size();
    }
    beginInsertRows(QModelIndex(), row, row);
    items.insert(row, item);
    item->d->theid = row;
    endInsertRows();
}
 
void QListModel::insert(int row, const QStringList &labels)
{
    const int count = labels.size();
    if (count <= 0)
        return;
    QListWidget *view = qobject_cast<QListWidget*>(QObject::parent());
    if (view && view->isSortingEnabled()) {
        // sorted insertion
        for (int i = 0; i < count; ++i) {
            QListWidgetItem *item = new QListWidgetItem(labels.at(i));
            insert(row, item);
        }
    } else {
        if (row < 0)
            row = 0;
        else if (row > items.size())
            row = items.size();
        beginInsertRows(QModelIndex(), row, row + count - 1);
        for (int i = 0; i < count; ++i) {
            QListWidgetItem *item = new QListWidgetItem(labels.at(i));
            item->d->theid = row;
            item->view = qobject_cast<QListWidget*>(QObject::parent());
            items.insert(row++, item);
        }
        endInsertRows();
    }
}
 
QListWidgetItem *QListModel::take(int row)
{
    if (row < 0 || row >= items.size())
        return nullptr;
 
    beginRemoveRows(QModelIndex(), row, row);
    items.at(row)->d->theid = -1;
    items.at(row)->view = nullptr;
    QListWidgetItem *item = items.takeAt(row);
    endRemoveRows();
    return item;
}
 
void QListModel::move(int srcRow, int dstRow)
{
    if (srcRow == dstRow
        || srcRow < 0 || srcRow >= items.size()
        || dstRow < 0 || dstRow > items.size())
        return;
 
    if (!beginMoveRows(QModelIndex(), srcRow, srcRow, QModelIndex(), dstRow))
        return;
    if (srcRow < dstRow)
        --dstRow;
    items.move(srcRow, dstRow);
    endMoveRows();
}
 
int QListModel::rowCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : items.size();
}
 
QModelIndex QListModel::index(const QListWidgetItem *item_) const
{
    QListWidgetItem *item = const_cast<QListWidgetItem *>(item_);
    if (!item || !item->view || static_cast<const QListModel *>(item->view->model()) != this
        || items.isEmpty())
        return QModelIndex();
    int row;
    const int theid = item->d->theid;
    if (theid >= 0 && theid < items.size() && items.at(theid) == item) {
        row = theid;
    } else { // we need to search for the item
        row = items.lastIndexOf(item);  // lastIndexOf is an optimization in favor of indexOf
        if (row == -1) // not found
            return QModelIndex();
        item->d->theid = row;
    }
    return createIndex(row, 0, item);
}
 
QModelIndex QListModel::index(int row, int column, const QModelIndex &parent) const
{
    if (hasIndex(row, column, parent))
        return createIndex(row, column, items.at(row));
    return QModelIndex();
}
 
QVariant QListModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid() || index.row() >= items.size())
        return QVariant();
    return items.at(index.row())->data(role);
}
 
bool QListModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (!index.isValid() || index.row() >= items.size())
        return false;
    items.at(index.row())->setData(role, value);
    return true;
}
 
bool QListModel::clearItemData(const QModelIndex &index)
{
    if (!checkIndex(index, CheckIndexOption::IndexIsValid))
        return false;
    QListWidgetItem *item = items.at(index.row());
    const auto beginIter = item->d->values.cbegin();
    const auto endIter = item->d->values.cend();
    if (std::all_of(beginIter, endIter, [](const QWidgetItemData& data) -> bool { return !data.value.isValid(); }))
        return true; //it's already cleared
    item->d->values.clear();
    emit dataChanged(index, index, QList<int> {});
    return true;
}
 
QMap<int, QVariant> QListModel::itemData(const QModelIndex &index) const
{
    QMap<int, QVariant> roles;
    if (!index.isValid() || index.row() >= items.size())
        return roles;
    QListWidgetItem *itm = items.at(index.row());
    for (int i = 0; i < itm->d->values.size(); ++i) {
        roles.insert(itm->d->values.at(i).role,
                     itm->d->values.at(i).value);
    }
    return roles;
}
 
bool QListModel::insertRows(int row, int count, const QModelIndex &parent)
{
    if (count < 1 || row < 0 || row > rowCount() || parent.isValid())
        return false;
 
    beginInsertRows(QModelIndex(), row, row + count - 1);
    QListWidget *view = qobject_cast<QListWidget*>(QObject::parent());
    QListWidgetItem *itm = nullptr;
 
    for (int r = row; r < row + count; ++r) {
        itm = new QListWidgetItem;
        itm->view = view;
        itm->d->theid = r;
        items.insert(r, itm);
    }
 
    endInsertRows();
    return true;
}
 
bool QListModel::removeRows(int row, int count, const QModelIndex &parent)
{
    if (count < 1 || row < 0 || (row + count) > rowCount() || parent.isValid())
        return false;
 
    beginRemoveRows(QModelIndex(), row, row + count - 1);
    QListWidgetItem *itm = nullptr;
    for (int r = row; r < row + count; ++r) {
        itm = items.takeAt(row);
        itm->view = nullptr;
        itm->d->theid = -1;
        delete itm;
    }
    endRemoveRows();
    return true;
}
 
bool QListModel::moveRows(const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild)
{
    if (sourceRow < 0
        || sourceRow + count - 1 >= rowCount(sourceParent)
        || destinationChild < 0
        || destinationChild > rowCount(destinationParent)
        || sourceRow == destinationChild
        || sourceRow == destinationChild - 1
        || count <= 0
        || sourceParent.isValid()
        || destinationParent.isValid()) {
        return false;
    }
    if (!beginMoveRows(QModelIndex(), sourceRow, sourceRow + count - 1, QModelIndex(), destinationChild))
        return false;
 
    int fromRow = sourceRow;
    if (destinationChild < sourceRow)
        fromRow += count - 1;
    else
        destinationChild--;
    while (count--)
        items.move(fromRow, destinationChild);
    endMoveRows();
    return true;
}
 
Qt::ItemFlags QListModel::flags(const QModelIndex &index) const
{
    if (!index.isValid() || index.row() >= items.size() || index.model() != this)
        return Qt::ItemIsDropEnabled; // we allow drops outside the items
    return items.at(index.row())->flags();
}
 
void QListModel::sort(int column, Qt::SortOrder order)
{
    if (column != 0)
        return;
 
    emit layoutAboutToBeChanged({}, QAbstractItemModel::VerticalSortHint);
 
    QList<QPair<QListWidgetItem *, int>> sorting(items.size());
    for (int i = 0; i < items.size(); ++i) {
        QListWidgetItem *item = items.at(i);
        sorting[i].first = item;
        sorting[i].second = i;
    }
 
    const auto compare = (order == Qt::AscendingOrder ? &itemLessThan : &itemGreaterThan);
    std::sort(sorting.begin(), sorting.end(), compare);
    QModelIndexList fromIndexes;
    QModelIndexList toIndexes;
    const int sortingCount = sorting.size();
    fromIndexes.reserve(sortingCount);
    toIndexes.reserve(sortingCount);
    for (int r = 0; r < sortingCount; ++r) {
        QListWidgetItem *item = sorting.at(r).first;
        toIndexes.append(createIndex(r, 0, item));
        fromIndexes.append(createIndex(sorting.at(r).second, 0, sorting.at(r).first));
        items[r] = sorting.at(r).first;
    }
    changePersistentIndexList(fromIndexes, toIndexes);
 
    emit layoutChanged({}, QAbstractItemModel::VerticalSortHint);
}
 
void QListModel::ensureSorted(int column, Qt::SortOrder order, int start, int end)
{
    if (column != 0)
        return;
 
    const int count = end - start + 1;
    QList<QPair<QListWidgetItem *, int>> sorting(count);
    for (int i = 0; i < count; ++i) {
        sorting[i].first = items.at(start + i);
        sorting[i].second = start + i;
    }
 
    const auto compare = (order == Qt::AscendingOrder ? &itemLessThan : &itemGreaterThan);
    std::sort(sorting.begin(), sorting.end(), compare);
 
    QModelIndexList oldPersistentIndexes = persistentIndexList();
    QModelIndexList newPersistentIndexes = oldPersistentIndexes;
    QList<QListWidgetItem*> tmp = items;
    QList<QListWidgetItem*>::iterator lit = tmp.begin();
    bool changed = false;
    for (int i = 0; i < count; ++i) {
        int oldRow = sorting.at(i).second;
        int tmpitepos = lit - tmp.begin();
        QListWidgetItem *item = tmp.takeAt(oldRow);
        if (tmpitepos > tmp.size())
            --tmpitepos;
        lit = tmp.begin() + tmpitepos;
        lit = sortedInsertionIterator(lit, tmp.end(), order, item);
        int newRow = qMax<qsizetype>(lit - tmp.begin(), 0);
        lit = tmp.insert(lit, item);
        if (newRow != oldRow) {
            if (!changed) {
                emit layoutAboutToBeChanged({}, QAbstractItemModel::VerticalSortHint);
                oldPersistentIndexes = persistentIndexList();
                newPersistentIndexes = oldPersistentIndexes;
                changed = true;
            }
            for (int j = i + 1; j < count; ++j) {
                int otherRow = sorting.at(j).second;
                if (oldRow < otherRow && newRow >= otherRow)
                    --sorting[j].second;
                else if (oldRow > otherRow && newRow <= otherRow)
                    ++sorting[j].second;
            }
            for (int k = 0; k < newPersistentIndexes.size(); ++k) {
                QModelIndex pi = newPersistentIndexes.at(k);
                int oldPersistentRow = pi.row();
                int newPersistentRow = oldPersistentRow;
                if (oldPersistentRow == oldRow)
                    newPersistentRow = newRow;
                else if (oldRow < oldPersistentRow && newRow >= oldPersistentRow)
                    newPersistentRow = oldPersistentRow - 1;
                else if (oldRow > oldPersistentRow && newRow <= oldPersistentRow)
                    newPersistentRow = oldPersistentRow + 1;
                if (newPersistentRow != oldPersistentRow)
                    newPersistentIndexes[k] = createIndex(newPersistentRow,
                                                          pi.column(), pi.internalPointer());
            }
        }
    }
 
    if (changed) {
        items = tmp;
        changePersistentIndexList(oldPersistentIndexes, newPersistentIndexes);
        emit layoutChanged({}, QAbstractItemModel::VerticalSortHint);
    }
}
 
bool QListModel::itemLessThan(const QPair<QListWidgetItem*,int> &left,
                              const QPair<QListWidgetItem*,int> &right)
{
    return (*left.first) < (*right.first);
}
 
bool QListModel::itemGreaterThan(const QPair<QListWidgetItem*,int> &left,
                                 const QPair<QListWidgetItem*,int> &right)
{
    return (*right.first) < (*left.first);
}
 
QList<QListWidgetItem*>::iterator QListModel::sortedInsertionIterator(
    const QList<QListWidgetItem*>::iterator &begin,
    const QList<QListWidgetItem*>::iterator &end,
    Qt::SortOrder order, QListWidgetItem *item)
{
    if (order == Qt::AscendingOrder)
        return std::lower_bound(begin, end, item, QListModelLessThan());
    return std::lower_bound(begin, end, item, QListModelGreaterThan());
}
 
void QListModel::itemChanged(QListWidgetItem *item, const QList<int> &roles)
{
    const QModelIndex idx = index(item);
    emit dataChanged(idx, idx, roles);
}
 
QStringList QListModel::mimeTypes() const
{
    const QListWidget *view = qobject_cast<const QListWidget*>(QObject::parent());
    if (view)
        return view->mimeTypes();
    return {};
}
 
QMimeData *QListModel::internalMimeData()  const
{
    return QAbstractItemModel::mimeData(cachedIndexes);
}
 
QMimeData *QListModel::mimeData(const QModelIndexList &indexes) const
{
    QList<QListWidgetItem*> itemlist;
    const int indexesCount = indexes.size();
    itemlist.reserve(indexesCount);
    for (int i = 0; i < indexesCount; ++i)
        itemlist << at(indexes.at(i).row());
    const QListWidget *view = qobject_cast<const QListWidget*>(QObject::parent());
 
    cachedIndexes = indexes;
    QMimeData *mimeData = view->mimeData(itemlist);
    cachedIndexes.clear();
    return mimeData;
}
 
#if QT_CONFIG(draganddrop)
bool QListModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                              int row, int column, const QModelIndex &index)
{
    Q_UNUSED(column);
    QListWidget *view = qobject_cast<QListWidget*>(QObject::parent());
    if (index.isValid())
        row = index.row();
    else if (row == -1)
        row = items.size();
 
    return view->dropMimeData(row, data, action);
}
 
Qt::DropActions QListModel::supportedDropActions() const
{
    const QListWidget *view = qobject_cast<const QListWidget*>(QObject::parent());
    return view->supportedDropActions();
}
#endif // QT_CONFIG(draganddrop)
 
QListWidgetItem::QListWidgetItem(QListWidget *listview, int type)
    : rtti(type), view(listview), d(new QListWidgetItemPrivate(this)),
      itemFlags(Qt::ItemIsSelectable
                |Qt::ItemIsUserCheckable
                |Qt::ItemIsEnabled
                |Qt::ItemIsDragEnabled)
{
    if (QListModel *model = listModel())
        model->insert(model->rowCount(), this);
}
 
QListWidgetItem::QListWidgetItem(const QString &text, QListWidget *listview, int type)
    : rtti(type), view(listview), d(new QListWidgetItemPrivate(this)),
      itemFlags(Qt::ItemIsSelectable
                |Qt::ItemIsUserCheckable
                |Qt::ItemIsEnabled
                |Qt::ItemIsDragEnabled)
{
    QListModel *model = listModel();
    {
        QSignalBlocker b(view);
        QSignalBlocker bm(model);
        setData(Qt::DisplayRole, text);
    }
    if (model)
        model->insert(model->rowCount(), this);
}
 
QListWidgetItem::QListWidgetItem(const QIcon &icon,const QString &text,
                                 QListWidget *listview, int type)
    : rtti(type), view(listview), d(new QListWidgetItemPrivate(this)),
      itemFlags(Qt::ItemIsSelectable
                |Qt::ItemIsUserCheckable
                |Qt::ItemIsEnabled
                |Qt::ItemIsDragEnabled)
{
    QListModel *model = listModel();
    {
        QSignalBlocker b(view);
        QSignalBlocker bm(model);
        setData(Qt::DisplayRole, text);
        setData(Qt::DecorationRole, icon);
    }
    if (model)
        model->insert(model->rowCount(), this);
}
 
QListWidgetItem::~QListWidgetItem()
{
    if (QListModel *model = listModel())
        model->remove(this);
    delete d;
}
 
QListWidgetItem *QListWidgetItem::clone() const
{
    return new QListWidgetItem(*this);
}
 
void QListWidgetItem::setData(int role, const QVariant &value)
{
    bool found = false;
    role = (role == Qt::EditRole ? Qt::DisplayRole : role);
    for (int i = 0; i < d->values.size(); ++i) {
        if (d->values.at(i).role == role) {
            if (d->values.at(i).value == value)
                return;
            d->values[i].value = value;
            found = true;
            break;
        }
    }
    if (!found)
        d->values.append(QWidgetItemData(role, value));
    if (QListModel *model = listModel()) {
        const QList<int> roles((role == Qt::DisplayRole)
                                       ? QList<int>({ Qt::DisplayRole, Qt::EditRole })
                                       : QList<int>({ role }));
        model->itemChanged(this, roles);
    }
}
 
QVariant QListWidgetItem::data(int role) const
{
    role = (role == Qt::EditRole ? Qt::DisplayRole : role);
    for (int i = 0; i < d->values.size(); ++i)
        if (d->values.at(i).role == role)
            return d->values.at(i).value;
    return QVariant();
}
 
bool QListWidgetItem::operator<(const QListWidgetItem &other) const
{
    const QVariant v1 = data(Qt::DisplayRole), v2 = other.data(Qt::DisplayRole);
    return QAbstractItemModelPrivate::variantLessThan(v1, v2);
}
 
#ifndef QT_NO_DATASTREAM
 
void QListWidgetItem::read(QDataStream &in)
{
    in >> d->values;
}
 
void QListWidgetItem::write(QDataStream &out) const
{
    out << d->values;
}
#endif // QT_NO_DATASTREAM
 
QListWidgetItem::QListWidgetItem(const QListWidgetItem &other)
    : rtti(Type), view(nullptr),
      d(new QListWidgetItemPrivate(this)),
      itemFlags(other.itemFlags)
{
    d->values = other.d->values;
}
 
QListWidgetItem &QListWidgetItem::operator=(const QListWidgetItem &other)
{
    d->values = other.d->values;
    itemFlags = other.itemFlags;
    return *this;
}
 
QListModel *QListWidgetItem::listModel() const
{
    return (view ? qobject_cast<QListModel*>(view->model()) : nullptr);
}
 
#ifndef QT_NO_DATASTREAM
 
QDataStream &operator<<(QDataStream &out, const QListWidgetItem &item)
{
    item.write(out);
    return out;
}
 
QDataStream &operator>>(QDataStream &in, QListWidgetItem &item)
{
    item.read(in);
    return in;
}
 
#endif // QT_NO_DATASTREAM
 
void QListWidgetItem::setSelected(bool select)
{
    const QListModel *model = listModel();
    if (!model || !view->selectionModel())
        return;
    const QAbstractItemView::SelectionMode selectionMode = view->selectionMode();
    if (selectionMode == QAbstractItemView::NoSelection)
        return;
    const QModelIndex index = model->index(this);
    if (selectionMode == QAbstractItemView::SingleSelection)
        view->selectionModel()->select(index, select
                                       ? QItemSelectionModel::ClearAndSelect
                                       : QItemSelectionModel::Deselect);
    else
        view->selectionModel()->select(index, select
                                       ? QItemSelectionModel::Select
                                       : QItemSelectionModel::Deselect);
}
 
bool QListWidgetItem::isSelected() const
{
    const QListModel *model = listModel();
    if (!model || !view->selectionModel())
        return false;
    const QModelIndex index = model->index(this);
    return view->selectionModel()->isSelected(index);
}
 
void QListWidgetItem::setFlags(Qt::ItemFlags aflags)
{
    itemFlags = aflags;
    if (QListModel *model = listModel())
        model->itemChanged(this);
}
 
 
void QListWidgetPrivate::setup()
{
    Q_Q(QListWidget);
    q->QListView::setModel(new QListModel(q));
    // view signals
    QObject::connect(q, SIGNAL(pressed(QModelIndex)), q, SLOT(_q_emitItemPressed(QModelIndex)));
    QObject::connect(q, SIGNAL(clicked(QModelIndex)), q, SLOT(_q_emitItemClicked(QModelIndex)));
    QObject::connect(q, SIGNAL(doubleClicked(QModelIndex)),
                     q, SLOT(_q_emitItemDoubleClicked(QModelIndex)));
    QObject::connect(q, SIGNAL(activated(QModelIndex)),
                     q, SLOT(_q_emitItemActivated(QModelIndex)));
    QObject::connect(q, SIGNAL(entered(QModelIndex)), q, SLOT(_q_emitItemEntered(QModelIndex)));
    QObject::connect(model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
                     q, SLOT(_q_emitItemChanged(QModelIndex)));
    QObject::connect(model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
                     q, SLOT(_q_dataChanged(QModelIndex,QModelIndex)));
    QObject::connect(model, SIGNAL(columnsRemoved(QModelIndex,int,int)), q, SLOT(_q_sort()));
}
 
void QListWidgetPrivate::_q_emitItemPressed(const QModelIndex &index)
{
    Q_Q(QListWidget);
    emit q->itemPressed(listModel()->at(index.row()));
}
 
void QListWidgetPrivate::_q_emitItemClicked(const QModelIndex &index)
{
    Q_Q(QListWidget);
    emit q->itemClicked(listModel()->at(index.row()));
}
 
void QListWidgetPrivate::_q_emitItemDoubleClicked(const QModelIndex &index)
{
    Q_Q(QListWidget);
    emit q->itemDoubleClicked(listModel()->at(index.row()));
}
 
void QListWidgetPrivate::_q_emitItemActivated(const QModelIndex &index)
{
    Q_Q(QListWidget);
    emit q->itemActivated(listModel()->at(index.row()));
}
 
void QListWidgetPrivate::_q_emitItemEntered(const QModelIndex &index)
{
    Q_Q(QListWidget);
    emit q->itemEntered(listModel()->at(index.row()));
}
 
void QListWidgetPrivate::_q_emitItemChanged(const QModelIndex &index)
{
    Q_Q(QListWidget);
    emit q->itemChanged(listModel()->at(index.row()));
}
 
void QListWidgetPrivate::_q_emitCurrentItemChanged(const QModelIndex &current,
                                                const QModelIndex &previous)
{
    Q_Q(QListWidget);
    QPersistentModelIndex persistentCurrent = current;
    QListWidgetItem *currentItem = listModel()->at(persistentCurrent.row());
    emit q->currentItemChanged(currentItem, listModel()->at(previous.row()));
 
    //persistentCurrent is invalid if something changed the model in response
    //to the currentItemChanged signal emission and the item was removed
    if (!persistentCurrent.isValid()) {
        currentItem = nullptr;
    }
 
    emit q->currentTextChanged(currentItem ? currentItem->text() : QString());
    emit q->currentRowChanged(persistentCurrent.row());
}
 
void QListWidgetPrivate::_q_sort()
{
    if (sortingEnabled)
        model->sort(0, sortOrder);
}
 
void QListWidgetPrivate::_q_dataChanged(const QModelIndex &topLeft,
                                        const QModelIndex &bottomRight)
{
    if (sortingEnabled && topLeft.isValid() && bottomRight.isValid())
        listModel()->ensureSorted(topLeft.column(), sortOrder,
                              topLeft.row(), bottomRight.row());
}
 
QListWidget::QListWidget(QWidget *parent)
    : QListView(*new QListWidgetPrivate(), parent)
{
    Q_D(QListWidget);
    d->setup();
}
 
QListWidget::~QListWidget()
{
}
 
void QListWidget::setSelectionModel(QItemSelectionModel *selectionModel)
{
    Q_D(QListWidget);
 
    if (d->selectionModel) {
        QObject::disconnect(d->selectionModel, SIGNAL(currentChanged(QModelIndex,QModelIndex)),
                            this, SLOT(_q_emitCurrentItemChanged(QModelIndex,QModelIndex)));
        QObject::disconnect(d->selectionModel, SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
                            this, SIGNAL(itemSelectionChanged()));
    }
 
    QListView::setSelectionModel(selectionModel);
 
    if (d->selectionModel) {
        QObject::connect(d->selectionModel, SIGNAL(currentChanged(QModelIndex,QModelIndex)),
                         this, SLOT(_q_emitCurrentItemChanged(QModelIndex,QModelIndex)));
        QObject::connect(d->selectionModel, SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
                         this, SIGNAL(itemSelectionChanged()));
    }
}
 
QListWidgetItem *QListWidget::item(int row) const
{
    Q_D(const QListWidget);
    if (row < 0 || row >= d->model->rowCount())
        return nullptr;
    return d->listModel()->at(row);
}
 
int QListWidget::row(const QListWidgetItem *item) const
{
    Q_D(const QListWidget);
    return d->listModel()->index(const_cast<QListWidgetItem*>(item)).row();
}
 
 
void QListWidget::insertItem(int row, QListWidgetItem *item)
{
    Q_D(QListWidget);
    if (item && !item->view)
        d->listModel()->insert(row, item);
}
 
void QListWidget::insertItem(int row, const QString &label)
{
    Q_D(QListWidget);
    d->listModel()->insert(row, new QListWidgetItem(label));
}
 
void QListWidget::insertItems(int row, const QStringList &labels)
{
    Q_D(QListWidget);
    d->listModel()->insert(row, labels);
}
 
QListWidgetItem *QListWidget::takeItem(int row)
{
    Q_D(QListWidget);
    if (row < 0 || row >= d->model->rowCount())
        return nullptr;
    return d->listModel()->take(row);
}
 
int QListWidget::count() const
{
    Q_D(const QListWidget);
    return d->model->rowCount();
}
 
QListWidgetItem *QListWidget::currentItem() const
{
    Q_D(const QListWidget);
    return d->listModel()->at(currentIndex().row());
}
 
 
void QListWidget::setCurrentItem(QListWidgetItem *item)
{
    setCurrentRow(row(item));
}
 
void QListWidget::setCurrentItem(QListWidgetItem *item, QItemSelectionModel::SelectionFlags command)
{
    setCurrentRow(row(item), command);
}
 
int QListWidget::currentRow() const
{
    return currentIndex().row();
}
 
void QListWidget::setCurrentRow(int row)
{
    Q_D(QListWidget);
    QModelIndex index = d->listModel()->index(row);
    if (d->selectionMode == SingleSelection)
        selectionModel()->setCurrentIndex(index, QItemSelectionModel::ClearAndSelect);
    else if (d->selectionMode == NoSelection)
        selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);
    else
        selectionModel()->setCurrentIndex(index, QItemSelectionModel::SelectCurrent);
}
 
void QListWidget::setCurrentRow(int row, QItemSelectionModel::SelectionFlags command)
{
    Q_D(QListWidget);
    d->selectionModel->setCurrentIndex(d->listModel()->index(row), command);
}
 
QListWidgetItem *QListWidget::itemAt(const QPoint &p) const
{
    Q_D(const QListWidget);
    return d->listModel()->at(indexAt(p).row());
 
}
 
QRect QListWidget::visualItemRect(const QListWidgetItem *item) const
{
    Q_D(const QListWidget);
    QModelIndex index = d->listModel()->index(const_cast<QListWidgetItem*>(item));
    return visualRect(index);
}
 
void QListWidget::sortItems(Qt::SortOrder order)
{
    Q_D(QListWidget);
    d->sortOrder = order;
    d->listModel()->sort(0, order);
}
 
void QListWidget::setSortingEnabled(bool enable)
{
    Q_D(QListWidget);
    d->sortingEnabled = enable;
}
 
bool QListWidget::isSortingEnabled() const
{
    Q_D(const QListWidget);
    return d->sortingEnabled;
}
 
Qt::SortOrder QListWidget::sortOrder() const
{
    Q_D(const QListWidget);
    return d->sortOrder;
}
 
void QListWidget::editItem(QListWidgetItem *item)
{
    Q_D(QListWidget);
    edit(d->listModel()->index(item));
}
 
void QListWidget::openPersistentEditor(QListWidgetItem *item)
{
    Q_D(QListWidget);
    QModelIndex index = d->listModel()->index(item);
    QAbstractItemView::openPersistentEditor(index);
}
 
void QListWidget::closePersistentEditor(QListWidgetItem *item)
{
    Q_D(QListWidget);
    QModelIndex index = d->listModel()->index(item);
    QAbstractItemView::closePersistentEditor(index);
}
 
bool QListWidget::isPersistentEditorOpen(QListWidgetItem *item) const
{
    Q_D(const QListWidget);
    const QModelIndex index = d->listModel()->index(item);
    return QAbstractItemView::isPersistentEditorOpen(index);
}
 
QWidget *QListWidget::itemWidget(QListWidgetItem *item) const
{
    Q_D(const QListWidget);
    QModelIndex index = d->listModel()->index(item);
    return QAbstractItemView::indexWidget(index);
}
 
void QListWidget::setItemWidget(QListWidgetItem *item, QWidget *widget)
{
    Q_D(QListWidget);
    QModelIndex index = d->listModel()->index(item);
    QAbstractItemView::setIndexWidget(index, widget);
}
 
QList<QListWidgetItem*> QListWidget::selectedItems() const
{
    Q_D(const QListWidget);
    QModelIndexList indexes = selectionModel()->selectedIndexes();
    QList<QListWidgetItem*> items;
    const int numIndexes = indexes.size();
    items.reserve(numIndexes);
    for (int i = 0; i < numIndexes; ++i)
        items.append(d->listModel()->at(indexes.at(i).row()));
    return items;
}
 
QList<QListWidgetItem*> QListWidget::findItems(const QString &text, Qt::MatchFlags flags) const
{
    Q_D(const QListWidget);
    QModelIndexList indexes = d->listModel()->match(model()->index(0, 0, QModelIndex()),
                                                Qt::DisplayRole, text, -1, flags);
    QList<QListWidgetItem*> items;
    const int indexesSize = indexes.size();
    items.reserve(indexesSize);
    for (int i = 0; i < indexesSize; ++i)
        items.append(d->listModel()->at(indexes.at(i).row()));
    return items;
}
 
void QListWidget::scrollToItem(const QListWidgetItem *item, QAbstractItemView::ScrollHint hint)
{
    Q_D(QListWidget);
    QModelIndex index = d->listModel()->index(const_cast<QListWidgetItem*>(item));
    QListView::scrollTo(index, hint);
}
 
void QListWidget::clear()
{
    Q_D(QListWidget);
    selectionModel()->clear();
    d->listModel()->clear();
}
 
QStringList QListWidget::mimeTypes() const
{
    return d_func()->listModel()->QAbstractListModel::mimeTypes();
}
 
QMimeData *QListWidget::mimeData(const QList<QListWidgetItem *> &items) const
{
    Q_D(const QListWidget);
 
    QModelIndexList &cachedIndexes = d->listModel()->cachedIndexes;
 
    // if non empty, it's called from the model's own mimeData
    if (cachedIndexes.isEmpty()) {
        cachedIndexes.reserve(items.size());
        for (QListWidgetItem *item : items)
            cachedIndexes << indexFromItem(item);
 
        QMimeData *result = d->listModel()->internalMimeData();
 
        cachedIndexes.clear();
        return result;
    }
 
    return d->listModel()->internalMimeData();
}
 
#if QT_CONFIG(draganddrop)
bool QListWidget::dropMimeData(int index, const QMimeData *data, Qt::DropAction action)
{
    QModelIndex idx;
    int row = index;
    int column = 0;
    if (dropIndicatorPosition() == QAbstractItemView::OnItem) {
        // QAbstractListModel::dropMimeData will overwrite on the index if row == -1 and column == -1
        idx = model()->index(row, column);
        row = -1;
        column = -1;
    }
    return d_func()->listModel()->QAbstractListModel::dropMimeData(data, action , row, column, idx);
}
 
void QListWidget::dropEvent(QDropEvent *event)
{
    QListView::dropEvent(event);
}
 
Qt::DropActions QListWidget::supportedDropActions() const
{
    Q_D(const QListWidget);
    return d->listModel()->QAbstractListModel::supportedDropActions() | Qt::MoveAction;
}
#endif // QT_CONFIG(draganddrop)
 
QList<QListWidgetItem*> QListWidget::items(const QMimeData *data) const
{
    const QListWidgetMimeData *lwd = qobject_cast<const QListWidgetMimeData*>(data);
    if (lwd)
        return lwd->items;
    return QList<QListWidgetItem*>();
}
 
QModelIndex QListWidget::indexFromItem(const QListWidgetItem *item) const
{
    Q_D(const QListWidget);
    return d->listModel()->index(item);
}
 
QListWidgetItem *QListWidget::itemFromIndex(const QModelIndex &index) const
{
    Q_D(const QListWidget);
    if (d->isIndexValid(index))
        return d->listModel()->at(index.row());
    return nullptr;
}
 
void QListWidget::setModel(QAbstractItemModel * /*model*/)
{
    Q_ASSERT(!"QListWidget::setModel() - Changing the model of the QListWidget is not allowed.");
}
 
bool QListWidget::event(QEvent *e)
{
    return QListView::event(e);
}
 
QT_END_NAMESPACE
 
#include "moc_qlistwidget.cpp"
#include "moc_qlistwidget_p.cpp"