内容

• 公共函数
• 重实现公共函数
• 详细描述
• 子类化

QAbstractListModel 类

QAbstractListModel class provides an abstract model that can be subclassed to create one-dimensional list models. 更多...

头：	#include <QAbstractListModel>
qmake:	QT += core
继承：	QAbstractItemModel
继承者：	QStringListModel

• 所有成员列表，包括继承成员

公共函数

	QAbstractListModel (QObject * parent = Q_NULLPTR)
	~QAbstractListModel ()

重实现公共函数

virtual bool	dropMimeData (const QMimeData * data , Qt::DropAction action , int row , int column , const QModelIndex & parent )
virtual Qt::ItemFlags	flags (const QModelIndex & index ) const
virtual QModelIndex	index (int row , int column = 0, const QModelIndex & parent = QModelIndex()) const
virtual QModelIndex	sibling (int row , int column , const QModelIndex & idx ) const

• 39 公共函数继承自 QAbstractItemModel
• 32 公共函数继承自 QObject

额外继承成员

• 1 特性继承自 QObject
• 2 public slots inherited from QAbstractItemModel
• 1 公共槽继承自 QObject
• 18 信号继承自 QAbstractItemModel
• 2 信号继承自 QObject
• 11 静态公共成员继承自 QObject
• 19 protected functions inherited from QAbstractItemModel
• 9 保护函数继承自 QObject
• 1 保护槽继承自 QAbstractItemModel

详细描述

QAbstractListModel class provides an abstract model that can be subclassed to create one-dimensional list models.

QAbstractListModel provides a standard interface for models that represent their data as a simple non-hierarchical sequence of items. It is not used directly, but must be subclassed.

Since the model provides a more specialized interface than QAbstractItemModel , it is not suitable for use with tree views; you will need to subclass QAbstractItemModel if you want to provide a model for that purpose. If you need to use a number of list models to manage data, it may be more appropriate to subclass QAbstractTableModel 代替。

Simple models can be created by subclassing this class and implementing the minimum number of required functions. For example, we could implement a simple read-only QStringList -based model that provides a list of strings to a QListView widget. In such a case, we only need to implement the rowCount () function to return the number of items in the list, and the data () function to retrieve items from the list.

Since the model represents a one-dimensional structure, the rowCount () function returns the total number of items in the model. The columnCount () function is implemented for interoperability with all kinds of views, but by default informs views that the model contains only one column.

子类化

当子类化 QAbstractListModel , you must provide implementations of the rowCount () 和 data () functions. Well behaved models also provide a headerData () 实现。

If your model is used within QML and requires roles other than the default ones provided by the roleNames () function, you must override it.

For editable list models, you must also provide an implementation of setData (), and implement the flags () function so that it returns a value containing Qt::ItemIsEditable .

注意， QAbstractListModel provides a default implementation of columnCount () that informs views that there is only a single column of items in this model.

Models that provide interfaces to resizable list-like data structures can provide implementations of insertRows () 和 removeRows (). When implementing these functions, it is important to call the appropriate functions so that all connected views are aware of any changes:

• An insertRows () implementation must call beginInsertRows () before inserting new rows into the data structure, and it must call endInsertRows () immediately afterwards .
• A removeRows () implementation must call beginRemoveRows () before the rows are removed from the data structure, and it must call endRemoveRows () immediately afterwards .

注意： Some general guidelines for subclassing models are available in the 模型子类化参考 .

另请参阅 模型类 , 模型子类化参考 , QAbstractItemView , QAbstractTableModel ，和 项视图拼图范例 .

成员函数文档编制

QAbstractListModel:: QAbstractListModel ( QObject * parent = Q_NULLPTR)

Constructs an abstract list model with the given parent .

QAbstractListModel:: ~QAbstractListModel ()

Destroys the abstract list model.

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

重实现自 QAbstractItemModel::dropMimeData ().

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

重实现自 QAbstractItemModel::flags ().

[virtual] QModelIndex QAbstractListModel:: index ( int row , int column = 0, const QModelIndex & parent = QModelIndex()) const

重实现自 QAbstractItemModel::index ().

Returns the index of the data in row and column with parent .

另请参阅 parent ().

[virtual] QModelIndex QAbstractListModel:: sibling ( int row , int column , const QModelIndex & idx ) const

重实现自 QAbstractItemModel::sibling ().