src_gui_itemviews_qidentityproxymodel.cpp

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// Copyright (C) 2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Stephen Kelly <stephen.kelly@kdab.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QIdentityProxyModel>
#include <QDateTime>
#include <QMap>
#include <QModelIndex>
#include <QVariant>
 
class SourceClass
{
public:
    enum Roles {
        DateRole = 1
    };
};
 
//! [0]
class DateFormatProxyModel : public QIdentityProxyModel
{
  // ...
 
  void setDateFormatString(const QString &formatString)
  {
    m_formatString = formatString;
  }
 
  QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override
  {
    if (role != Qt::DisplayRole)
      return QIdentityProxyModel::data(index, role);
 
    const QModelIndex sourceIndex = mapToSource(index);
    const QDateTime dateTime = sourceModel()->data(sourceIndex, SourceClass::DateRole).toDateTime();
    return dateTime.toString(m_formatString);
  }
 
  QMap<int, QVariant> itemData(const QModelIndex &proxyIndex) const override
  {
      QMap<int, QVariant> map = QIdentityProxyModel::itemData(proxyIndex);
      map[Qt::DisplayRole] = data(proxyIndex);
      return map;
  }
 
private:
  QString m_formatString;
};
//! [0]