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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, int role = Qt.DisplayRole)
- Qt.ItemFlags flags (self, QModelIndex)
- QVariant headerData (self, int, Qt.Orientation, int)
- dict-of-int-QVariant itemData (self, QModelIndex)
- QModelIndex mapFromSource (self, QModelIndex)
- QItemSelection mapSelectionFromSource (self, QItemSelection)
- QItemSelection mapSelectionToSource (self, QItemSelection)
- QModelIndex mapToSource (self, QModelIndex)
- revert (self)
- bool setData (self, QModelIndex, QVariant, int role = Qt.EditRole)
- bool setHeaderData (self, int, Qt.Orientation, QVariant, int role = Qt.EditRole)
- setSourceModel (self, QAbstractItemModel)
- 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.

See also QSortFilterProxyModel, QAbstractItemModel, and Model/View Programming.

## 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, int role = Qt.DisplayRole)

Reimplemented from QAbstractItemModel.data().

See also setData().

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

Reimplemented from QAbstractItemModel.flags().

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

Reimplemented from QAbstractItemModel.headerData().

See also setHeaderData().

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

Reimplemented from QAbstractItemModel.itemData().

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

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)

Returns a proxy selection mapped from the specified sourceSelection.

Reimplement this method to map source selections to proxy selections.

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

Returns a source selection mapped from the specified proxySelection.

Reimplement this method to map proxy selections to source selections.

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

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, QVariant, int role = Qt.EditRole)

Reimplemented from QAbstractItemModel.setData().

See also data().

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

Reimplemented from QAbstractItemModel.setHeaderData().

See also headerData().

### QAbstractProxyModel.setSourceModel (self, QAbstractItemModel)

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().