QPersistentModelIndex 類

QPersistentModelIndex 類用於在數據模型中定位數據。更多...

頭：	#include <QPersistentModelIndex>
qmake:	QT += core

公共函數

	QPersistentModelIndex (QPersistentModelIndex && other )
	QPersistentModelIndex (const QPersistentModelIndex & other )
	QPersistentModelIndex (const QModelIndex & index )
QPersistentModelIndex &	operator= (const QModelIndex & other )
QPersistentModelIndex &	operator= (QPersistentModelIndex && other )
QPersistentModelIndex &	operator= (const QPersistentModelIndex & other )
int	column () const
QVariant	data (int role = Qt::DisplayRole) const
Qt::ItemFlags	flags () const
bool	isValid () const
const QAbstractItemModel *	model () const
QModelIndex	parent () const
int	row () const
QModelIndex	sibling (int row , int column ) const
void	swap (QPersistentModelIndex & other )
const QModelIndex &	operator const QModelIndex & () const
bool	operator!= (const QPersistentModelIndex & other ) const
bool	operator!= (const QModelIndex & other ) const
bool	operator< (const QPersistentModelIndex & other ) const
bool	operator== (const QPersistentModelIndex & other ) const
bool	operator== (const QModelIndex & other ) const

uint	qHash (const QPersistentModelIndex & index , uint seed = 0)

詳細描述

A QPersistentModelIndex is a model index that can be stored by an application, and later used to access information in a model. Unlike the QModelIndex class, it is safe to store a QPersistentModelIndex since the model will ensure that references to items will continue to be valid as long as they can be accessed by the model.

It is good practice to check that persistent model indexes are valid before using them.

注意： You cannot store a QStandardItemModel 's QPersistentModelIndex in one of the model's items.

另請參閱 模型/視圖編程 , QModelIndex ，和 QAbstractItemModel .

成員函數文檔編製

QPersistentModelIndex:: QPersistentModelIndex ( QPersistentModelIndex && other )

Move-constructs a QPersistentModelIndex instance, making it point at the same object that other 所指嚮的。

該函數在 Qt 5.2 引入。

QPersistentModelIndex:: QPersistentModelIndex (const QPersistentModelIndex & other )

Creates a new QPersistentModelIndex that is a copy of the other persistent model index.

QPersistentModelIndex:: QPersistentModelIndex (const QModelIndex & index )

Creates a new QPersistentModelIndex that is a copy of the model index .

QPersistentModelIndex &QPersistentModelIndex:: operator= (const QModelIndex & other )

Sets the persistent model index to refer to the same item in a model as the other 模型索引。

QPersistentModelIndex &QPersistentModelIndex:: operator= ( QPersistentModelIndex && other )

移動賦值 other 到此 QPersistentModelIndex 實例。

該函數在 Qt 5.2 引入。

QPersistentModelIndex &QPersistentModelIndex:: operator= (const QPersistentModelIndex & other )

Sets the persistent model index to refer to the same item in a model as the other persistent model index.

int QPersistentModelIndex:: column () const

Returns the column this persistent model index refers to.

QVariant QPersistentModelIndex:: data ( int role = Qt::DisplayRole) const

返迴數據為給定 role 對於項引用通過索引。

另請參閱 Qt::ItemDataRole and QAbstractItemModel::setData ().

Qt::ItemFlags QPersistentModelIndex:: flags () const

返迴由索引所引用的項標誌。

該函數在 Qt 4.2 引入。

bool QPersistentModelIndex:: isValid () const

返迴 true 若此持久模型索引有效；否則返迴 false .

有效索引屬於模型，且擁有非負行號和列號。

另請參閱 model (), row ()，和 column ().

const QAbstractItemModel *QPersistentModelIndex:: model () const

返迴索引所屬的模型。

QModelIndex QPersistentModelIndex:: parent () const

Returns the parent QModelIndex for this persistent index, or an invalid QModelIndex if it has no parent.

另請參閱 sibling () 和 model ().

int QPersistentModelIndex:: row () const

Returns the row this persistent model index refers to.

QModelIndex QPersistentModelIndex:: sibling ( int row , int column ) const

返迴同級在 row and column or an invalid QModelIndex if there is no sibling at this position.

另請參閱 parent ().

void QPersistentModelIndex:: swap ( QPersistentModelIndex & other )

Swaps this persistent modelindex with other 。此函數非常快且從不失敗。

該函數在 Qt 5.0 引入。

const QModelIndex &QPersistentModelIndex:: operator const QModelIndex & () const

Cast operator that returns a const QModelIndex &.

bool QPersistentModelIndex:: operator!= (const QPersistentModelIndex & other ) const

返迴 true if this persistent model index is not equal to the other persistent model index; otherwise returns false .

該函數在 Qt 4.2 引入。

bool QPersistentModelIndex:: operator!= (const QModelIndex & other ) const

返迴 true if this persistent model index does not refer to the same location as the other 模型索引；否則返迴 false .

bool QPersistentModelIndex:: operator< (const QPersistentModelIndex & other ) const

返迴 true if this persistent model index is smaller than the other persistent model index; otherwise returns false .

The internal data pointer, row, column, and model values in the persistent model index are used when comparing with another persistent model index.

該函數在 Qt 4.1 引入。

bool QPersistentModelIndex:: operator== (const QPersistentModelIndex & other ) const

返迴 true if this persistent model index is equal to the other persistent model index; otherwise returns false .