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# QAbstractProxyModel Class Reference
[QtGui module]

The QAbstractProxyModel class provides a base class for proxy item models that can do sorting, filtering or other data processing tasks. More...

Inherits QAbstractItemModel.

Inherited by QSortFilterProxyModel.

### Methods

- __init__ (self, QObject parent = None)
- QVariant data (self, QModelIndex proxyIndex, int role = Qt.DisplayRole)
- Qt.ItemFlags flags (self, QModelIndex index)
- QVariant headerData (self, int section, Qt.Orientation orientation, int role)
- dict-of-int-QVariant itemData (self, QModelIndex index)
- QModelIndex mapFromSource (self, QModelIndex sourceIndex)
- QItemSelection mapSelectionFromSource (self, QItemSelection selection)
- QItemSelection mapSelectionToSource (self, QItemSelection selection)
- QModelIndex mapToSource (self, QModelIndex proxyIndex)
- revert (self)
- bool setData (self, QModelIndex index, QVariant value, int role = Qt.EditRole)
- bool setHeaderData (self, int section, Qt.Orientation orientation, QVariant value, int role = Qt.EditRole)
- setSourceModel (self, QAbstractItemModel sourceModel)
- QAbstractItemModel sourceModel (self)
- bool submit (self)

## Detailed Description

The QAbstractProxyModel class provides a base class for proxy item models that can do sorting, filtering or other data processing tasks.

This class defines the standard interface that proxy models must use to be able to interoperate correctly with other model/view components. It is not supposed to be instantiated directly.

All standard proxy models are derived from the QAbstractProxyModel class. If you need to create a new proxy model class, it is usually better to subclass an existing class that provides the closest behavior to the one you want to provide.

Proxy models that filter or sort items of data from a source model should be created by using or subclassing QSortFilterProxyModel.

To subclass QAbstractProxyModel, you need to implement mapFromSource() and mapToSource(). The mapSelectionFromSource() and mapSelectionToSource() functions only need to be reimplemented if you need a behavior different from the default behavior.

Note: If the source model is deleted or no source model is specified, the proxy model operates on a empty placeholder model.

## Method Documentation

### QAbstractProxyModel.__init__ (self, QObject parent = None)

The parent argument, if not None, causes self to be owned by Qt instead of PyQt.

Constructs a proxy model with the given parent.

### QVariant QAbstractProxyModel.data (self, QModelIndex proxyIndex, int role = Qt.DisplayRole)

Reimplemented from QAbstractItemModel.data().

See also setData().

### Qt.ItemFlags QAbstractProxyModel.flags (self, QModelIndex index)

Reimplemented from QAbstractItemModel.flags().

### QVariant QAbstractProxyModel.headerData (self, int section, Qt.Orientation orientation, int role)

Reimplemented from QAbstractItemModel.headerData().

See also setHeaderData().

### dict-of-int-QVariant QAbstractProxyModel.itemData (self, QModelIndex index)

Reimplemented from QAbstractItemModel.itemData().

See also setItemData().

### QModelIndex QAbstractProxyModel.mapFromSource (self, QModelIndex sourceIndex)

This method is abstract and should be reimplemented in any sub-class.

Reimplement this function to return the model index in the proxy model that corresponds to the sourceIndex from the source model.

See also mapToSource().

### QItemSelection QAbstractProxyModel.mapSelectionFromSource (self, QItemSelection selection)

Returns a proxy selection mapped from the specified sourceSelection.

Reimplement this method to map source selections to proxy selections.

### QItemSelection QAbstractProxyModel.mapSelectionToSource (self, QItemSelection selection)

Returns a source selection mapped from the specified proxySelection.

Reimplement this method to map proxy selections to source selections.

### QModelIndex QAbstractProxyModel.mapToSource (self, QModelIndex proxyIndex)

This method is abstract and should be reimplemented in any sub-class.

Reimplement this function to return the model index in the source model that corresponds to the proxyIndex in the proxy model.

See also mapFromSource().

### QAbstractProxyModel.revert (self)

Reimplemented from QAbstractItemModel.revert().

### bool QAbstractProxyModel.setData (self, QModelIndex index, QVariant value, int role = Qt.EditRole)

Reimplemented from QAbstractItemModel.setData().

See also data().

### bool QAbstractProxyModel.setHeaderData (self, int section, Qt.Orientation orientation, QVariant value, int role = Qt.EditRole)

Reimplemented from QAbstractItemModel.setHeaderData().

See also headerData().

### QAbstractProxyModel.setSourceModel (self, QAbstractItemModel sourceModel)

Sets the given sourceModel to be processed by the proxy model.

See also sourceModel().

### QAbstractItemModel QAbstractProxyModel.sourceModel (self)

Returns the model that contains the data that is available through the proxy model.

See also setSourceModel().

### bool QAbstractProxyModel.submit (self)

Reimplemented from QAbstractItemModel.submit().