PySide6.QtCore.QIdentityProxyModel¶

class QIdentityProxyModel¶

The QIdentityProxyModel class proxies its source model unmodified. More…

Synopsis¶

Methods¶

def __init__()
def handleSourceDataChanges()
def handleSourceLayoutChanges()
def setHandleSourceDataChanges()
def setHandleSourceLayoutChanges()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description¶

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

QIdentityProxyModel can be used to forward the structure of a source model exactly, with no sorting, filtering or other transformation. This is similar in concept to an identity matrix where A.I = A.

Because it does no sorting or filtering, this class is most suitable to proxy models which transform the data() of the source model. For example, a proxy model could be created to define the font used, or the background colour, or the tooltip etc. This removes the need to implement all data handling in the same class that creates the structure of the model, and can also be used to create re-usable components.

This also provides a way to change the data in the case where a source model is supplied by a third party which cannot be modified.

class DateFormatProxyModel(QIdentityProxyModel):

  # ...
  def setDateFormatString(formatString):

    m_formatString = formatString

  QVariant data(QModelIndex index, int role) override

    if role != Qt.DisplayRole:
      return QIdentityProxyModel.data(index, role)
    sourceIndex = mapToSource(index)
    dateTime = sourceModel().data(sourceIndex, SourceClass::DateRole).toDateTime()
    return dateTime.toString(m_formatString)

  QMap<int, QVariant> itemData(QModelIndex proxyIndex) override

      QVariant> map = QIdentityProxyModel.itemData(proxyIndex)
      map[Qt.DisplayRole] = data(proxyIndex)
      return map

# private
  m_formatString = QString()