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QSortFilterProxyModel Class Reference
[QtGui module]

The QSortFilterProxyModel class provides support for sorting and filtering data passed between another model and a view. More...

 #include <QSortFilterProxyModel>

Inherits QAbstractProxyModel.

This class was introduced in Qt 4.1.


Properties

  • 1 property inherited from QObject

Public Functions

QSortFilterProxyModel ( QObject * parent = 0 )
~QSortFilterProxyModel ()
bool dynamicSortFilter () const
Qt::CaseSensitivity filterCaseSensitivity () const
int filterKeyColumn () const
QRegExp filterRegExp () const
int filterRole () const
bool isSortLocaleAware () const
void setDynamicSortFilter ( bool enable )
void setFilterCaseSensitivity ( Qt::CaseSensitivity cs )
void setFilterKeyColumn ( int column )
void setFilterRegExp ( const QRegExp & regExp )
void setFilterRole ( int role )
void setSortCaseSensitivity ( Qt::CaseSensitivity cs )
void setSortLocaleAware ( bool on )
void setSortRole ( int role )
Qt::CaseSensitivity sortCaseSensitivity () const
int sortColumn () const
Qt::SortOrder sortOrder () const
int sortRole () const

Reimplemented Public Functions

virtual QModelIndex buddy ( const QModelIndex & index ) const
virtual bool canFetchMore ( const QModelIndex & parent ) const
virtual int columnCount ( const QModelIndex & parent = QModelIndex() ) const
virtual QVariant data ( const QModelIndex & index, int role = Qt::DisplayRole ) const
virtual bool dropMimeData ( const QMimeData * data, Qt::DropAction action, int row, int column, const QModelIndex & parent )
virtual void fetchMore ( const QModelIndex & parent )
virtual Qt::ItemFlags flags ( const QModelIndex & index ) const
virtual bool hasChildren ( const QModelIndex & parent = QModelIndex() ) const
virtual QVariant headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const
virtual QModelIndex index ( int row, int column, const QModelIndex & parent = QModelIndex() ) const
virtual bool insertColumns ( int column, int count, const QModelIndex & parent = QModelIndex() )
virtual bool insertRows ( int row, int count, const QModelIndex & parent = QModelIndex() )
virtual QModelIndex mapFromSource ( const QModelIndex & sourceIndex ) const
virtual QItemSelection mapSelectionFromSource ( const QItemSelection & sourceSelection ) const
virtual QItemSelection mapSelectionToSource ( const QItemSelection & proxySelection ) const
virtual QModelIndex mapToSource ( const QModelIndex & proxyIndex ) const
virtual QModelIndexList match ( const QModelIndex & start, int role, const QVariant & value, int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap ) ) const
virtual QMimeData * mimeData ( const QModelIndexList & indexes ) const
virtual QStringList mimeTypes () const
virtual QModelIndex parent ( const QModelIndex & child ) const
virtual bool removeColumns ( int column, int count, const QModelIndex & parent = QModelIndex() )
virtual bool removeRows ( int row, int count, const QModelIndex & parent = QModelIndex() )
virtual int rowCount ( const QModelIndex & parent = QModelIndex() ) const
virtual bool setData ( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole )
virtual bool setHeaderData ( int section, Qt::Orientation orientation, const QVariant & value, int role = Qt::EditRole )
virtual void setSourceModel ( QAbstractItemModel * sourceModel )
virtual void sort ( int column, Qt::SortOrder order = Qt::AscendingOrder )
virtual QSize span ( const QModelIndex & index ) const
virtual Qt::DropActions supportedDropActions () const

Public Slots

void invalidate ()
void setFilterFixedString ( const QString & pattern )
void setFilterRegExp ( const QString & pattern )
void setFilterWildcard ( const QString & pattern )

Protected Functions

virtual bool filterAcceptsColumn ( int source_column, const QModelIndex & source_parent ) const
virtual bool filterAcceptsRow ( int source_row, const QModelIndex & source_parent ) const
void invalidateFilter ()
virtual bool lessThan ( const QModelIndex & left, const QModelIndex & right ) const

Additional Inherited Members


Detailed Description

The QSortFilterProxyModel class provides support for sorting and filtering data passed between another model and a view.

QSortFilterProxyModel can be used for sorting items, filtering out items, or both. The model transforms the structure of a source model by mapping the model indexes it supplies to new indexes, corresponding to different locations, for views to use. This approach allows a given source model to be restructured as far as views are concerned without requiring any transformations on the underlying data, and without duplicating the data in memory.

Let's assume that we want to sort and filter the items provided by a custom model. The code to set up the model and the view, without sorting and filtering, would look like this:

         QTreeView *treeView = new QTreeView;
         MyItemModel *model = new MyItemModel(this);

         treeView->setModel(model);

To add sorting and filtering support to MyItemModel, we need to create a QSortFilterProxyModel, call setSourceModel() with the MyItemModel as argument, and install the QSortFilterProxyModel on the view:

         QTreeView *treeView = new QTreeView;
         MyItemModel *sourceModel = new MyItemModel(this);
         QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel(this);

         proxyModel->setSourceModel(sourceModel);
         treeView->setModel(proxyModel);

At this point, neither sorting nor filtering is enabled; the original data is displayed in the view. Any changes made through the QSortFilterProxyModel are applied to the original model.

The QSortFilterProxyModel acts as a wrapper for the original model. If you need to convert source QModelIndexes to sorted/filtered model indexes or vice versa, use mapToSource(), mapFromSource(), mapSelectionToSource(), and mapSelectionFromSource().

Note: By default, the model does not dynamically re-sort and re-filter data whenever the original model changes. This behavior can be changed by setting the dynamicSortFilter property.

The Basic Sort/Filter Model and Custom Sort/Filter Model examples illustrate how to use QSortFilterProxyModel to perform basic sorting and filtering and how to subclass it to implement custom behavior.

Sorting

QTableView and QTreeView have a sortingEnabled property that controls whether the user can sort the view by clicking the view's horizontal header. For example:

         treeView->setSortingEnabled(true);

When this feature is on (the default is off), clicking on a header section sorts the items according to that column. By clicking repeatedly, the user can alternate between ascending and descending order.

A sorted QTreeView

Behind the scene, the view calls the sort() virtual function on the model to reorder the data in the model. To make your data sortable, you can either implement sort() in your model, or use a QSortFilterProxyModel to wrap your model -- QSortFilterProxyModel provides a generic sort() reimplementation that operates on the sortRole() (Qt::DisplayRole by default) of the items and that understands several data types, including int, QString, and QDateTime. For hierarchical models, sorting is applied recursively to all child items. String comparisons are case sensitive by default; this can be changed by setting the sortCaseSensitivity property.

Custom sorting behavior is achieved by subclassing QSortFilterProxyModel and reimplementing lessThan(), which is used to compare items. For example:

 bool MySortFilterProxyModel::lessThan(const QModelIndex &left,
                                       const QModelIndex &right) const
 {
     QVariant leftData = sourceModel()->data(left);
     QVariant rightData = sourceModel()->data(right);

     if (leftData.type() == QVariant::DateTime) {
         return leftData.toDateTime() < rightData.toDateTime();
     } else {
         QRegExp *emailPattern = new QRegExp("([\\w\\.]*@[\\w\\.]*)");

         QString leftString = leftData.toString();
         if(left.column() == 1 && emailPattern->indexIn(leftString) != -1)
             leftString = emailPattern->cap(1);

         QString rightString = rightData.toString();
         if(right.column() == 1 && emailPattern->indexIn(rightString) != -1)
             rightString = emailPattern->cap(1);

         return QString::localeAwareCompare(leftString, rightString) < 0;
     }
 }

(This code snippet comes from the Custom Sort/Filter Model example.)

An alternative approach to sorting is to disable sorting on the view and to impose a certain order to the user. This is done by explicitly calling sort() with the desired column and order as arguments on the QSortFilterProxyModel (or on the original model if it implements sort()). For example:

         proxyModel->sort(2, Qt::AscendingOrder);

QSortFilterProxyModel can be sorted by column -1, in which case it returns to the sort order of the underlying source model.

Filtering

In addition to sorting, QSortFilterProxyModel can be used to hide items that do not match a certain filter. The filter is specified using a QRegExp object and is applied to the filterRole() (Qt::DisplayRole by default) of each item, for a given column. The QRegExp object can be used to match a regular expression, a wildcard pattern, or a fixed string. For example:

         proxyModel->setFilterRegExp(QRegExp(".png", Qt::CaseInsensitive,
                                             QRegExp::FixedString));
         proxyModel->setFilterKeyColumn(1);

For hierarchical models, the filter is applied recursively to all children. If a parent item doesn't match the filter, none of its children will be shown.

A common use case is to let the user specify the filter regexp, wildcard pattern, or fixed string in a QLineEdit and to connect the textChanged() signal to setFilterRegExp(), setFilterWildcard(), or setFilterFixedString() to reapply the filter.

Custom filtering behavior can be achieved by reimplementing the filterAcceptsRow() and filterAcceptsColumn() functions. For example (from the Custom Sort/Filter Model example), the following implementation ignores the filterKeyColumn property and performs filtering on columns 0, 1, and 2:

 bool MySortFilterProxyModel::filterAcceptsRow(int sourceRow,
         const QModelIndex &sourceParent) const
 {
     QModelIndex index0 = sourceModel()->index(sourceRow, 0, sourceParent);
     QModelIndex index1 = sourceModel()->index(sourceRow, 1, sourceParent);
     QModelIndex index2 = sourceModel()->index(sourceRow, 2, sourceParent);

     return (sourceModel()->data(index0).toString().contains(filterRegExp())
             || sourceModel()->data(index1).toString().contains(filterRegExp()))
            && dateInRange(sourceModel()->data(index2).toDate());
 }

(This code snippet comes from the Custom Sort/Filter Model example.)

If you are working with large amounts of filtering and have to invoke invalidateFilter() repeatedly, using reset() may be more efficient, depending on the implementation of your model. However, reset() returns the proxy model to its original state, losing selection information, and will cause the proxy model to be repopulated.

Subclassing

Since QAbstractProxyModel and its subclasses are derived from QAbstractItemModel, much of the same advice about subclassing normal models also applies to proxy models. In addition, it is worth noting that many of the default implementations of functions in this class are written so that they call the equivalent functions in the relevant source model. This simple proxying mechanism may need to be overridden for source models with more complex behavior; for example, if the source model provides a custom hasChildren() implementation, you should also provide one in the proxy model.

Note: Some general guidelines for subclassing models are available in the Model Subclassing Reference.

See also QAbstractProxyModel, QAbstractItemModel, Model/View Programming, Basic Sort/Filter Model Example, and Custom Sort/Filter Model Example.


Property Documentation

dynamicSortFilter : bool

This property holds whether the proxy model is dynamically sorted and filtered whenever the contents of the source model change.

The default value is false.

This property was introduced in Qt 4.2.

Access functions:

bool dynamicSortFilter () const
void setDynamicSortFilter ( bool enable )

filterCaseSensitivity : Qt::CaseSensitivity

This property holds the case sensitivity of the QRegExp pattern used to filter the contents of the source model.

By default, the filter is case sensitive.

Access functions:

Qt::CaseSensitivity filterCaseSensitivity () const
void setFilterCaseSensitivity ( Qt::CaseSensitivity cs )

See also filterRegExp and sortCaseSensitivity.

filterKeyColumn : int

This property holds the column where the key used to filter the contents of the source model is read from.

The default value is 0. If the value is -1, the keys will be read from all columns.

Access functions:

int filterKeyColumn () const
void setFilterKeyColumn ( int column )

filterRegExp : QRegExp

This property holds the QRegExp used to filter the contents of the source model.

Setting this property overwrites the current filterCaseSensitivity. By default, the QRegExp is an empty string matching all contents.

If no QRegExp or an empty string is set, everything in the source model will be accepted.

Access functions:

QRegExp filterRegExp () const
void setFilterRegExp ( const QRegExp & regExp )
void setFilterRegExp ( const QString & pattern )

See also filterCaseSensitivity, setFilterWildcard(), and setFilterFixedString().

filterRole : int

This property holds the item role that is used to query the source model's data when filtering items.

The default value is Qt::DisplayRole.

This property was introduced in Qt 4.2.

Access functions:

int filterRole () const
void setFilterRole ( int role )

See also filterAcceptsRow().

isSortLocaleAware : bool

This property holds the local aware setting used for comparing strings when sorting.

By default, sorting is not local aware.

This property was introduced in Qt 4.3.

Access functions:

bool isSortLocaleAware () const
void setSortLocaleAware ( bool on )

See also sortCaseSensitivity and lessThan().

sortCaseSensitivity : Qt::CaseSensitivity

This property holds the case sensitivity setting used for comparing strings when sorting.

By default, sorting is case sensitive.

This property was introduced in Qt 4.2.

Access functions:

Qt::CaseSensitivity sortCaseSensitivity () const
void setSortCaseSensitivity ( Qt::CaseSensitivity cs )

See also filterCaseSensitivity and lessThan().

sortRole : int

This property holds the item role that is used to query the source model's data when sorting items.

The default value is Qt::DisplayRole.

This property was introduced in Qt 4.2.

Access functions:

int sortRole () const
void setSortRole ( int role )

See also lessThan().


Member Function Documentation

QSortFilterProxyModel::QSortFilterProxyModel ( QObject * parent = 0 )

Constructs a sorting filter model with the given parent.

QSortFilterProxyModel::~QSortFilterProxyModel ()

Destroys this sorting filter model.

QModelIndex QSortFilterProxyModel::buddy ( const QModelIndex & index ) const   [virtual]

Reimplemented from QAbstractItemModel::buddy().

bool QSortFilterProxyModel::canFetchMore ( const QModelIndex & parent ) const   [virtual]

Reimplemented from QAbstractItemModel::canFetchMore().

int QSortFilterProxyModel::columnCount ( const QModelIndex & parent = QModelIndex() ) const   [virtual]

Reimplemented from QAbstractItemModel::columnCount().

QVariant QSortFilterProxyModel::data ( const QModelIndex & index, int role = Qt::DisplayRole ) const   [virtual]

Reimplemented from QAbstractItemModel::data().

See also setData().

bool QSortFilterProxyModel::dropMimeData ( const QMimeData * data, Qt::DropAction action, int row, int column, const QModelIndex & parent )   [virtual]

Reimplemented from QAbstractItemModel::dropMimeData().

void QSortFilterProxyModel::fetchMore ( const QModelIndex & parent )   [virtual]

Reimplemented from QAbstractItemModel::fetchMore().

bool QSortFilterProxyModel::filterAcceptsColumn ( int source_column, const QModelIndex & source_parent ) const   [virtual protected]

Returns true if the item in the column indicated by the given source_column and source_parent should be included in the model; otherwise returns false.

The default implementation returns true if the value held by the relevant item matches the filter string, wildcard string or regular expression.

Note: By default, the Qt::DisplayRole is used to determine if the row should be accepted or not. This can be changed by setting the filterRole property.

See also filterAcceptsRow(), setFilterFixedString(), setFilterRegExp(), and setFilterWildcard().

bool QSortFilterProxyModel::filterAcceptsRow ( int source_row, const QModelIndex & source_parent ) const   [virtual protected]

Returns true if the item in the row indicated by the given source_row and source_parent should be included in the model; otherwise returns false.

The default implementation returns true if the value held by the relevant item matches the filter string, wildcard string or regular expression.

Note: By default, the Qt::DisplayRole is used to determine if the row should be accepted or not. This can be changed by setting the filterRole property.

See also filterAcceptsColumn(), setFilterFixedString(), setFilterRegExp(), and setFilterWildcard().

Qt::ItemFlags QSortFilterProxyModel::flags ( const QModelIndex & index ) const   [virtual]

Reimplemented from QAbstractItemModel::flags().

bool QSortFilterProxyModel::hasChildren ( const QModelIndex & parent = QModelIndex() ) const   [virtual]

Reimplemented from QAbstractItemModel::hasChildren().

QVariant QSortFilterProxyModel::headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const   [virtual]

Reimplemented from QAbstractItemModel::headerData().

See also setHeaderData().

QModelIndex QSortFilterProxyModel::index ( int row, int column, const QModelIndex & parent = QModelIndex() ) const   [virtual]

Reimplemented from QAbstractItemModel::index().

bool QSortFilterProxyModel::insertColumns ( int column, int count, const QModelIndex & parent = QModelIndex() )   [virtual]

Reimplemented from QAbstractItemModel::insertColumns().

bool QSortFilterProxyModel::insertRows ( int row, int count, const QModelIndex & parent = QModelIndex() )   [virtual]

Reimplemented from QAbstractItemModel::insertRows().

void QSortFilterProxyModel::invalidate ()   [slot]

Invalidates the current sorting and filtering.

This function was introduced in Qt 4.3.

See also invalidateFilter().

void QSortFilterProxyModel::invalidateFilter ()   [protected]

Invalidates the current filtering.

This function should be called if you are implementing custom filtering (e.g. filterAcceptsRow()), and your filter parameters have changed.

This function was introduced in Qt 4.3.

See also invalidate().

bool QSortFilterProxyModel::lessThan ( const QModelIndex & left, const QModelIndex & right ) const   [virtual protected]

Returns true if the value of the item referred to by the given index left is less than the value of the item referred to by the given index right, otherwise returns false.

This function is used as the < operator when sorting, and handles the following QVariant types:

Any other type will be converted to a QString using QVariant::toString().

Comparison of QStrings is case sensitive by default; this can be changed using the sortCaseSensitivity property.

By default, the Qt::DisplayRole associated with the QModelIndexes is used for comparisons. This can be changed by setting the sortRole property.

Note: The indices passed in correspond to the source model.

See also sortRole, sortCaseSensitivity, and dynamicSortFilter.

QModelIndex QSortFilterProxyModel::mapFromSource ( const QModelIndex & sourceIndex ) const   [virtual]

Reimplemented from QAbstractProxyModel::mapFromSource().

Returns the model index in the QSortFilterProxyModel given the sourceIndex from the source model.

See also mapToSource().

QItemSelection QSortFilterProxyModel::mapSelectionFromSource ( const QItemSelection & sourceSelection ) const   [virtual]

Reimplemented from QAbstractProxyModel::mapSelectionFromSource().

QItemSelection QSortFilterProxyModel::mapSelectionToSource ( const QItemSelection & proxySelection ) const   [virtual]

Reimplemented from QAbstractProxyModel::mapSelectionToSource().

QModelIndex QSortFilterProxyModel::mapToSource ( const QModelIndex & proxyIndex ) const   [virtual]

Reimplemented from QAbstractProxyModel::mapToSource().

Returns the source model index corresponding to the given proxyIndex from the sorting filter model.

See also mapFromSource().

QModelIndexList QSortFilterProxyModel::match ( const QModelIndex & start, int role, const QVariant & value, int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap ) ) const   [virtual]

Reimplemented from QAbstractItemModel::match().

QMimeData * QSortFilterProxyModel::mimeData ( const QModelIndexList & indexes ) const   [virtual]

Reimplemented from QAbstractItemModel::mimeData().

QStringList QSortFilterProxyModel::mimeTypes () const   [virtual]

Reimplemented from QAbstractItemModel::mimeTypes().

QModelIndex QSortFilterProxyModel::parent ( const QModelIndex & child ) const   [virtual]

Reimplemented from QAbstractItemModel::parent().

bool QSortFilterProxyModel::removeColumns ( int column, int count, const QModelIndex & parent = QModelIndex() )   [virtual]

Reimplemented from QAbstractItemModel::removeColumns().

bool QSortFilterProxyModel::removeRows ( int row, int count, const QModelIndex & parent = QModelIndex() )   [virtual]

Reimplemented from QAbstractItemModel::removeRows().

int QSortFilterProxyModel::rowCount ( const QModelIndex & parent = QModelIndex() ) const   [virtual]

Reimplemented from QAbstractItemModel::rowCount().

bool QSortFilterProxyModel::setData ( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole )   [virtual]

Reimplemented from QAbstractItemModel::setData().

See also data().

void QSortFilterProxyModel::setFilterFixedString ( const QString & pattern )   [slot]

Sets the fixed string used to filter the contents of the source model to the given pattern.

See also setFilterCaseSensitivity(), setFilterRegExp(), setFilterWildcard(), and filterRegExp().

void QSortFilterProxyModel::setFilterWildcard ( const QString & pattern )   [slot]

Sets the wildcard expression used to filter the contents of the source model to the given pattern.

See also setFilterCaseSensitivity(), setFilterRegExp(), setFilterFixedString(), and filterRegExp().

bool QSortFilterProxyModel::setHeaderData ( int section, Qt::Orientation orientation, const QVariant & value, int role = Qt::EditRole )   [virtual]

Reimplemented from QAbstractItemModel::setHeaderData().

See also headerData().

void QSortFilterProxyModel::setSourceModel ( QAbstractItemModel * sourceModel )   [virtual]

Reimplemented from QAbstractProxyModel::setSourceModel().

void QSortFilterProxyModel::sort ( int column, Qt::SortOrder order = Qt::AscendingOrder )   [virtual]

Reimplemented from QAbstractItemModel::sort().

int QSortFilterProxyModel::sortColumn () const

the column currently used for sorting

This returns the most recently used sort column.

This function was introduced in Qt 4.5.

Qt::SortOrder QSortFilterProxyModel::sortOrder () const

the order currently used for sorting

This returns the most recently used sort order.

This function was introduced in Qt 4.5.

QSize QSortFilterProxyModel::span ( const QModelIndex & index ) const   [virtual]

Reimplemented from QAbstractItemModel::span().

Qt::DropActions QSortFilterProxyModel::supportedDropActions () const   [virtual]

Reimplemented from QAbstractItemModel::supportedDropActions().

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