KReparentingProxyModel Class Reference

#include <kreparentingproxymodel.h>

Inheritance diagram for KReparentingProxyModel:

Public Member Functions
	KReparentingProxyModel (QObject *parent=0)
	~KReparentingProxyModel ()
virtual int	columnCount (const QModelIndex &parent=QModelIndex()) const
virtual QVariant	data (const QModelIndex &proxyIndex, int role=Qt::DisplayRole) const
virtual bool	hasChildren (const QModelIndex &parent=QModelIndex()) const
virtual QModelIndex	index (int row, int column, const QModelIndex &parent=QModelIndex()) const
virtual bool	isDescendantOf (const QModelIndex &ancestor, const QModelIndex &descendant) const
virtual QModelIndex	mapFromSource (const QModelIndex &sourceIndex) const
virtual QModelIndex	mapToSource (const QModelIndex &proxyIndex) const
virtual QModelIndex	parent (const QModelIndex &child) const
virtual int	rowCount (const QModelIndex &parent=QModelIndex()) const
virtual void	setSourceModel (QAbstractItemModel *sourceModel)
virtual Qt::DropActions	supportedDropActions () const

Detailed Description

Restructures a source model, changing the parents of items.

Subclasses can change the structure of a source model by reimplementing the isDescendantOf method.

For example, if the source model is a list,

0
- A
- B
- C
- D
- E

It could be converted to a tree by an implementation something like:

bool MyReparentingModel::isDescedantOf(const QModelIndex& ancestor, const QModelIndex& descendant ) const
{
   return (
           (ancestor.data().toString() == "A" && descendant.data().toString() == "B")
        || (ancestor.data().toString() == "A" && descendant.data().toString() == "C")
        || (ancestor.data().toString() == "B" && descendant.data().toString() == "C")
        || (ancestor.data().toString() == "A" && descendant.data().toString() == "D")
        )
  ? true : KReparentingProxyModel::isDescendantOf(ancestor, descendant);
}

to get this result:

0
- A
- - B
- - - C
- - D
- E

Note that the implementation returns true for a query if "C" is a descendant of "A". The implementation must return the correct value for all of its descendants, not only its direct parent. The actual location to insert the descendant in the tree is determined internally by a binary find algorithm.

Definition at line 74 of file kreparentingproxymodel.h.

Constructor & Destructor Documentation

KReparentingProxyModel::KReparentingProxyModel ( QObject *  parent = 0 )

explicit

Definition at line 435 of file kreparentingproxymodel.cpp.

KReparentingProxyModel::~KReparentingProxyModel

(

)

Definition at line 441 of file kreparentingproxymodel.cpp.

Member Function Documentation

int KReparentingProxyModel::columnCount ( const QModelIndex &  parent = QModelIndex() ) const

virtual

Definition at line 566 of file kreparentingproxymodel.cpp.

QVariant KReparentingProxyModel::data ( const QModelIndex &  proxyIndex, int  role = Qt::DisplayRole  ) const

virtual

Definition at line 583 of file kreparentingproxymodel.cpp.

bool KReparentingProxyModel::hasChildren ( const QModelIndex &  parent = QModelIndex() ) const

virtual

Definition at line 692 of file kreparentingproxymodel.cpp.

QModelIndex KReparentingProxyModel::index ( int  row, int  column, const QModelIndex &  parent = QModelIndex()  ) const

virtual

Definition at line 588 of file kreparentingproxymodel.cpp.

bool KReparentingProxyModel::isDescendantOf ( const QModelIndex &  ancestor, const QModelIndex &  descendant  ) const

virtual

Reimplement this to return whether descendant is a descendant of ancestor.

Definition at line 463 of file kreparentingproxymodel.cpp.

QModelIndex KReparentingProxyModel::mapFromSource ( const QModelIndex &  sourceIndex ) const

virtual

Definition at line 470 of file kreparentingproxymodel.cpp.

QModelIndex KReparentingProxyModel::mapToSource ( const QModelIndex &  proxyIndex ) const

virtual

Definition at line 503 of file kreparentingproxymodel.cpp.

QModelIndex KReparentingProxyModel::parent ( const QModelIndex &  child ) const

virtual

Definition at line 619 of file kreparentingproxymodel.cpp.

int KReparentingProxyModel::rowCount ( const QModelIndex &  parent = QModelIndex() ) const

virtual

Definition at line 671 of file kreparentingproxymodel.cpp.

void KReparentingProxyModel::setSourceModel ( QAbstractItemModel *  sourceModel )

virtual

Definition at line 697 of file kreparentingproxymodel.cpp.

Qt::DropActions KReparentingProxyModel::supportedDropActions ( ) const

virtual

Definition at line 1462 of file kreparentingproxymodel.cpp.

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The documentation for this class was generated from the following files:

• kreparentingproxymodel.h
• kreparentingproxymodel.cpp