QTreeView *treeView = new QTreeView;
        MyItemModel *model = new MyItemModel(this);

        treeView->setModel(model);

        QTreeView *treeView = new QTreeView;
        MyItemModel *sourceModel = new MyItemModel(this);
        QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel(this);

        proxyModel->setSourceModel(sourceModel);
        treeView->setModel(proxyModel);

        treeView->setSortingEnabled(true);

bool MySortFilterProxyModel::lessThan(const QModelIndex &left,
                                      const QModelIndex &right) const
{
    QVariant leftData = sourceModel()->data(left);
    QVariant rightData = sourceModel()->data(right);

    if (leftData.type() == QVariant::DateTime) {
        return leftData.toDateTime() < rightData.toDateTime();
    } else {
        static const QRegularExpression emailPattern("[\\w\\.]*@[\\w\\.]*");

        QString leftString = leftData.toString();
        if (left.column() == 1) {
            const QRegularExpressionMatch match = emailPattern.match(leftString);
            if (match.hasMatch())
                leftString = match.captured(0);
        }
        QString rightString = rightData.toString();
        if (right.column() == 1) {
            const QRegularExpressionMatch match = emailPattern.match(rightString);
            if (match.hasMatch())
                rightString = match.captured(0);
        }

        return QString::localeAwareCompare(leftString, rightString) < 0;
    }
}

        proxyModel->sort(2, Qt::AscendingOrder);

        proxyModel->setFilterRegExp(QRegExp(".png", Qt::CaseInsensitive,
                                            QRegExp::FixedString));
        proxyModel->setFilterKeyColumn(1);

bool MySortFilterProxyModel::filterAcceptsRow(int sourceRow,
                                              const QModelIndex &sourceParent) const
{
    QModelIndex index0 = sourceModel()->index(sourceRow, 0, sourceParent);
    QModelIndex index1 = sourceModel()->index(sourceRow, 1, sourceParent);
    QModelIndex index2 = sourceModel()->index(sourceRow, 2, sourceParent);

    return (sourceModel()->data(index0).toString().contains(filterRegExp())
            || sourceModel()->data(index1).toString().contains(filterRegExp()))
            && dateInRange(sourceModel()->data(index2).toDate());
}

Member Function Documentation

QSortFilterProxyModel::QSortFilterProxyModel(QObject *parent = nullptr)

Constructs a sorting filter model with the given parent.

[slot] void QSortFilterProxyModel::invalidate()

Invalidates the current sorting and filtering.

This function was introduced in Qt 4.3.

See also invalidateFilter().

[slot] void QSortFilterProxyModel::setFilterFixedString(const QString &pattern)

Sets the fixed string used to filter the contents of the source model to the given pattern.

See also setFilterCaseSensitivity(), setFilterRegExp(), setFilterWildcard(), and filterRegExp().

[slot] void QSortFilterProxyModel::setFilterRegExp(const QString &pattern)

This is an overloaded function.

Sets the regular expression used to filter the contents of the source model to pattern.

Note: Setter function for property filterRegExp.

See also setFilterCaseSensitivity(), setFilterWildcard(), setFilterFixedString(), and filterRegExp().

[slot] void QSortFilterProxyModel::setFilterRegularExpression(const QString &pattern)

Sets the regular expression used to filter the contents of the source model to pattern.

This method should be preferred for new code as it will use QRegularExpression internally.

This function was introduced in Qt 5.12.

Note: Setter function for property filterRegularExpression.

See also setFilterCaseSensitivity(), setFilterWildcard(), setFilterFixedString(), and filterRegularExpression().

[slot] void QSortFilterProxyModel::setFilterWildcard(const QString &pattern)

Sets the wildcard expression used to filter the contents of the source model to the given pattern.

See also setFilterCaseSensitivity(), setFilterRegExp(), setFilterFixedString(), and filterRegExp().

[virtual] QSortFilterProxyModel::~QSortFilterProxyModel()

Destroys this sorting filter model.

[override virtual] QModelIndex QSortFilterProxyModel::buddy(const QModelIndex &index) const

Reimplements: QAbstractProxyModel::buddy(const QModelIndex &index) const.

[override virtual] bool QSortFilterProxyModel::canFetchMore(const QModelIndex &parent) const

Reimplements: QAbstractProxyModel::canFetchMore(const QModelIndex &parent) const.

[override virtual] int QSortFilterProxyModel::columnCount(const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractItemModel::columnCount(const QModelIndex &parent) const.

[override virtual] QVariant QSortFilterProxyModel::data(const QModelIndex &index, int role = Qt::DisplayRole) const

Reimplements: QAbstractProxyModel::data(const QModelIndex &proxyIndex, int role) const.

See also setData().

[override virtual] bool QSortFilterProxyModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)

Reimplements: QAbstractProxyModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent).

[override virtual] void QSortFilterProxyModel::fetchMore(const QModelIndex &parent)

Reimplements: QAbstractProxyModel::fetchMore(const QModelIndex &parent).

[virtual protected] bool QSortFilterProxyModel::filterAcceptsColumn(int source_column, const QModelIndex &source_parent) const

Returns true if the item in the column indicated by the given source_column and source_parent should be included in the model; otherwise returns false.

The default implementation returns true if the value held by the relevant item matches the filter string, wildcard string or regular expression.

Note: By default, the Qt::DisplayRole is used to determine if the column should be accepted or not. This can be changed by setting the filterRole property.

See also filterAcceptsRow(), setFilterFixedString(), setFilterRegExp(), and setFilterWildcard().

[virtual protected] bool QSortFilterProxyModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const

Returns true if the item in the row indicated by the given source_row and source_parent should be included in the model; otherwise returns false.

The default implementation returns true if the value held by the relevant item matches the filter string, wildcard string or regular expression.

Note: By default, the Qt::DisplayRole is used to determine if the row should be accepted or not. This can be changed by setting the filterRole property.

See also filterAcceptsColumn(), setFilterFixedString(), setFilterRegExp(), and setFilterWildcard().

[override virtual] Qt::ItemFlags QSortFilterProxyModel::flags(const QModelIndex &index) const

Reimplements: QAbstractProxyModel::flags(const QModelIndex &index) const.

[override virtual] bool QSortFilterProxyModel::hasChildren(const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractProxyModel::hasChildren(const QModelIndex &parent) const.

[override virtual] QVariant QSortFilterProxyModel::headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const

Reimplements: QAbstractProxyModel::headerData(int section, Qt::Orientation orientation, int role) const.

See also setHeaderData().

[override virtual] QModelIndex QSortFilterProxyModel::index(int row, int column, const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractItemModel::index(int row, int column, const QModelIndex &parent) const.

[override virtual] bool QSortFilterProxyModel::insertColumns(int column, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::insertColumns(int column, int count, const QModelIndex &parent).

[override virtual] bool QSortFilterProxyModel::insertRows(int row, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::insertRows(int row, int count, const QModelIndex &parent).

[protected] void QSortFilterProxyModel::invalidateFilter()

Invalidates the current filtering.

This function should be called if you are implementing custom filtering (e.g. filterAcceptsRow()), and your filter parameters have changed.

This function was introduced in Qt 4.3.

See also invalidate().

[virtual protected] bool QSortFilterProxyModel::lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const

Returns true if the value of the item referred to by the given index source_left is less than the value of the item referred to by the given index source_right, otherwise returns false.

This function is used as the < operator when sorting, and handles the following QVariant types:

• QMetaType::Int
• QMetaType::UInt
• QMetaType::LongLong
• QMetaType::ULongLong
• QMetaType::Float
• QMetaType::Double
• QMetaType::QChar
• QMetaType::QDate
• QMetaType::QTime
• QMetaType::QDateTime
• QMetaType::QString

Any other type will be converted to a QString using QVariant::toString().

Comparison of QStrings is case sensitive by default; this can be changed using the sortCaseSensitivity property.

By default, the Qt::DisplayRole associated with the QModelIndexes is used for comparisons. This can be changed by setting the sortRole property.

Note: The indices passed in correspond to the source model.

See also sortRole, sortCaseSensitivity, and dynamicSortFilter.

[override virtual] QModelIndex QSortFilterProxyModel::mapFromSource(const QModelIndex &sourceIndex) const

Reimplements: QAbstractProxyModel::mapFromSource(const QModelIndex &sourceIndex) const.

Returns the model index in the QSortFilterProxyModel given the sourceIndex from the source model.

See also mapToSource().

[override virtual] QItemSelection QSortFilterProxyModel::mapSelectionFromSource(const QItemSelection &sourceSelection) const

Reimplements: QAbstractProxyModel::mapSelectionFromSource(const QItemSelection &sourceSelection) const.

[override virtual] QItemSelection QSortFilterProxyModel::mapSelectionToSource(const QItemSelection &proxySelection) const

Reimplements: QAbstractProxyModel::mapSelectionToSource(const QItemSelection &proxySelection) const.

[override virtual] QModelIndex QSortFilterProxyModel::mapToSource(const QModelIndex &proxyIndex) const

Reimplements: QAbstractProxyModel::mapToSource(const QModelIndex &proxyIndex) const.

Returns the source model index corresponding to the given proxyIndex from the sorting filter model.

See also mapFromSource().

[override virtual] QModelIndexList QSortFilterProxyModel::match(const QModelIndex &start, int role, const QVariant &value, int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags(Qt::MatchStartsWith|Qt::MatchWrap)) const

Reimplements: QAbstractItemModel::match(const QModelIndex &start, int role, const QVariant &value, int hits, Qt::MatchFlags flags) const.

[override virtual] QMimeData *QSortFilterProxyModel::mimeData(const QModelIndexList &indexes) const

Reimplements: QAbstractProxyModel::mimeData(const QModelIndexList &indexes) const.

[override virtual] QStringList QSortFilterProxyModel::mimeTypes() const

Reimplements: QAbstractProxyModel::mimeTypes() const.

[override virtual] QModelIndex QSortFilterProxyModel::parent(const QModelIndex &child) const

Reimplements: QAbstractItemModel::parent(const QModelIndex &index) const.

[override virtual] bool QSortFilterProxyModel::removeColumns(int column, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::removeColumns(int column, int count, const QModelIndex &parent).

[override virtual] bool QSortFilterProxyModel::removeRows(int row, int count, const QModelIndex &parent = QModelIndex())

Reimplements: QAbstractItemModel::removeRows(int row, int count, const QModelIndex &parent).

[override virtual] int QSortFilterProxyModel::rowCount(const QModelIndex &parent = QModelIndex()) const

Reimplements: QAbstractItemModel::rowCount(const QModelIndex &parent) const.

[override virtual] bool QSortFilterProxyModel::setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole)

Reimplements: QAbstractProxyModel::setData(const QModelIndex &index, const QVariant &value, int role).

See also data().

[override virtual] bool QSortFilterProxyModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role = Qt::EditRole)

Reimplements: QAbstractProxyModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role).

See also headerData().

[override virtual] void QSortFilterProxyModel::setSourceModel(QAbstractItemModel *sourceModel)

Reimplements: QAbstractProxyModel::setSourceModel(QAbstractItemModel *sourceModel).

[override virtual] QModelIndex QSortFilterProxyModel::sibling(int row, int column, const QModelIndex &idx) const

Reimplements: QAbstractProxyModel::sibling(int row, int column, const QModelIndex &idx) const.

[override virtual] void QSortFilterProxyModel::sort(int column, Qt::SortOrder order = Qt::AscendingOrder)

Reimplements: QAbstractProxyModel::sort(int column, Qt::SortOrder order).

int QSortFilterProxyModel::sortColumn() const

the column currently used for sorting

This returns the most recently used sort column.

This function was introduced in Qt 4.5.

Qt::SortOrder QSortFilterProxyModel::sortOrder() const

the order currently used for sorting

This returns the most recently used sort order.

This function was introduced in Qt 4.5.

[override virtual] QSize QSortFilterProxyModel::span(const QModelIndex &index) const

Reimplements: QAbstractProxyModel::span(const QModelIndex &index) const.

[override virtual] Qt::DropActions QSortFilterProxyModel::supportedDropActions() const

Reimplements: QAbstractProxyModel::supportedDropActions() const.