QPersistentModelIndex 类

QPersistentModelIndex 类用于在数据模型中定位数据。 更多...

头：	#include <QPersistentModelIndex>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake:	QT += core

• 所有成员列表，包括继承成员
• QPersistentModelIndex is part of 隐式共享类 .

此类 强烈可比较 .

此类 强烈可比较 with QModelIndex .

公共函数

	QPersistentModelIndex (const QModelIndex & index )
	QPersistentModelIndex (const QPersistentModelIndex & other )
	QPersistentModelIndex (QPersistentModelIndex && other )
int	column () const
QVariant	data (int role = Qt::DisplayRole) const
Qt::ItemFlags	flags () const
bool	isValid () const
const QAbstractItemModel *	model () const
(从 6.0 起) void	multiData (QModelRoleDataSpan roleDataSpan ) const
QModelIndex	parent () const
int	row () const
QModelIndex	sibling (int row , int column ) const
void	swap (QPersistentModelIndex & other )
QModelIndex	operator QModelIndex () const
QPersistentModelIndex &	operator= (QPersistentModelIndex && other )
QPersistentModelIndex &	operator= (const QModelIndex & other )
QPersistentModelIndex &	operator= (const QPersistentModelIndex & other )

相关非成员

size_t	qHash (const QPersistentModelIndex & key , size_t seed = 0)
bool	operator!= (const QPersistentModelIndex & lhs , const QModelIndex & rhs )
bool	operator!= (const QPersistentModelIndex & lhs , const QPersistentModelIndex & rhs )
bool	operator< (const QPersistentModelIndex & lhs , const QPersistentModelIndex & rhs )
bool	operator== (const QPersistentModelIndex & lhs , const QModelIndex & rhs )
bool	operator== (const QPersistentModelIndex & lhs , const QPersistentModelIndex & rhs )

详细描述

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.

另请参阅 模型/视图编程 , QModelIndex ，和 QAbstractItemModel .

成员函数文档编制

QPersistentModelIndex:: QPersistentModelIndex (const QModelIndex & index )

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

QPersistentModelIndex:: QPersistentModelIndex (const QPersistentModelIndex & other )

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

[noexcept] QPersistentModelIndex:: QPersistentModelIndex ( QPersistentModelIndex && other )

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

int QPersistentModelIndex:: column () const

Returns the column this persistent model index refers to.

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

返回数据为给定 role for the item referred to by the index, or a default-constructed QVariant if this persistent model index is 无效 .

另请参阅 Qt::ItemDataRole and QAbstractItemModel::setData ().

Qt::ItemFlags QPersistentModelIndex:: flags () const

返回由索引所引用的项标志。

bool QPersistentModelIndex:: isValid () const

返回 true 若此持久模型索引有效；否则返回 false .

有效索引属于模型，且拥有非负行号和列号。

另请参阅 model (), row ()，和 column ().

const QAbstractItemModel *QPersistentModelIndex:: model () const

返回索引所属的模型。

[since 6.0] void QPersistentModelIndex:: multiData ( QModelRoleDataSpan roleDataSpan ) const

Populates the given roleDataSpan 对于索引所引用的项。

该函数在 Qt 6.0 引入。

另请参阅 Qt::ItemDataRole and QAbstractItemModel::setData ().

QModelIndex QPersistentModelIndex:: parent () const

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

另请参阅 sibling () 和 model ().

int QPersistentModelIndex:: row () const

Returns the row this persistent model index refers to.

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

返回同级在 row and column or an invalid QModelIndex if there is no sibling at this position.

另请参阅 parent ().

[noexcept] void QPersistentModelIndex:: swap ( QPersistentModelIndex & other )

Swaps this persistent modelindex with other 。此操作非常快且从不失败。

QModelIndex QPersistentModelIndex:: operator QModelIndex () const

Cast operator that returns a QModelIndex .

[noexcept] QPersistentModelIndex &QPersistentModelIndex:: operator= ( QPersistentModelIndex && other )

移动赋值 other 到此 QPersistentModelIndex 实例。

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= (const QPersistentModelIndex & other )

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

相关非成员

[noexcept] size_t qHash (const QPersistentModelIndex & key , size_t seed = 0)

返回哈希值为 key ，使用 seed 做计算种子。

[noexcept] bool operator!= (const QPersistentModelIndex & lhs , const QModelIndex & rhs )

返回 true if lhs persistent model index does not refer to the same location as the rhs 模型索引；否则返回 false .

[noexcept] bool operator!= (const QPersistentModelIndex & lhs , const QPersistentModelIndex & rhs )

返回 true if lhs persistent model index is not equal to the rhs persistent model index; otherwise returns false .

[noexcept] bool operator< (const QPersistentModelIndex & lhs , const QPersistentModelIndex & rhs )

返回 true if lhs persistent model index is smaller than the rhs 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.

[noexcept] bool operator== (const QPersistentModelIndex & lhs , const QModelIndex & rhs )

返回 true if lhs persistent model index refers to the same location as the rhs 模型索引；否则返回 false .

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

[noexcept] bool operator== (const QPersistentModelIndex & lhs , const QPersistentModelIndex & rhs )

返回 true if lhs persistent model index is equal to the rhs 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.

内容

1. 公共函数

2. 相关非成员

3. 详细描述