src_corelib_kernel_qabstractitemmodel.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
beginInsertRows(parent, 2, 4);
 
 
beginInsertRows(parent, 4, 5);
 
 
beginRemoveRows(parent, 2, 3);
 
 
beginInsertColumns(parent, 4, 6);
 
 
beginInsertColumns(parent, 6, 8);
 
 
beginRemoveColumns(parent, 4, 6);
 
 
beginMoveRows(sourceParent, 2, 4, destinationParent, 2);
 
 
beginMoveRows(sourceParent, 2, 4, destinationParent, 6);
 
 
beginMoveRows(parent, 2, 2, parent, 0);
 
 
beginMoveRows(parent, 2, 2, parent, 4);
 
 
class CustomDataProxy : public QSortFilterProxyModel
{
    Q_OBJECT
public:
    CustomDataProxy(QObject *parent)
      : QSortFilterProxyModel(parent)
    {
    }
 
    ...
 
    QVariant data(const QModelIndex &index, int role) override
    {
        if (role != Qt::BackgroundRole)
            return QSortFilterProxyModel::data(index, role);
 
        if (m_customData.contains(index.row()))
            return m_customData.value(index.row());
        return QSortFilterProxyModel::data(index, role);
    }
 
private slots:
    void resetInternalData()
    {
        m_customData.clear();
    }
 
private:
  QHash<int, QVariant> m_customData;
};
 
QVariant text = model->data(index, Qt::DisplayRole);
QVariant decoration = model->data(index, Qt::DecorationRole);
QVariant checkState = model->data(index, Qt::CheckStateRole);
// etc.
 
std::array<QModelRoleData, 3> roleData = { {
    QModelRoleData(Qt::DisplayRole),
    QModelRoleData(Qt::DecorationRole),
    QModelRoleData(Qt::CheckStateRole)
} };
 
// Usually, this is not necessary: A QModelRoleDataSpan
// will be built automatically for you when passing an array-like
// container to multiData().
QModelRoleDataSpan span(roleData);
 
model->multiData(index, span);
 
// Use roleData[0].data(), roleData[1].data(), etc.
 
void MyModel::multiData(const QModelIndex &index, QModelRoleDataSpan roleDataSpan) const
{
    for (QModelRoleData &roleData : roleDataSpan) {
        int role = roleData.role();
 
        // ... obtain the data for index and role ...
 
        roleData.setData(result);
    }
}
 
QVariant MyModel::data(const QModelIndex &index, int role) const
{
    QModelRoleData roleData(role);
    multiData(index, roleData);
    return roleData.data();
}