QAbstractItemModel ¶

函数 ¶

虚函数 ¶

槽 ¶

信号 ¶

子类化 ¶

注意

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

当子类化 QAbstractItemModel , at the very least you must implement index() , parent() , rowCount() , columnCount() ，和 data() . These functions are used in all read-only models, and form the basis of editable models.

You can also reimplement hasChildren() to provide special behavior for models where the implementation of rowCount() is expensive. This makes it possible for models to restrict the amount of data requested by views, and can be used as a way to implement lazy population of model data.

To enable editing in your model, you must also implement setData() , and reimplement flags() to ensure that ItemIsEditable is returned. You can also reimplement headerData() and setHeaderData() to control the way the headers for your model are presented.

dataChanged() and headerDataChanged() signals must be emitted explicitly when reimplementing the setData() and setHeaderData() functions, respectively.

Custom models need to create model indexes for other components to use. To do this, call createIndex() with suitable row and column numbers for the item, and an identifier for it, either as a pointer or as an integer value. The combination of these values must be unique for each item. Custom models typically use these unique identifiers in other reimplemented functions to retrieve item data and access information about the item’s parents and children. See the 简单树模型范例 for more information about unique identifiers.

It is not necessary to support every role defined in ItemDataRole . Depending on the type of data contained within a model, it may only be useful to implement the data() function to return valid information for some of the more common roles. Most models provide at least a textual representation of item data for the DisplayRole , and well-behaved models should also provide valid information for the ToolTipRole and WhatsThisRole . Supporting these roles enables models to be used with standard Qt views. However, for some models that handle highly-specialized data, it may be appropriate to provide data only for user-defined roles.

Models that provide interfaces to resizable data structures can provide implementations of insertRows() , removeRows() , insertColumns() ,and removeColumns() . When implementing these functions, it is important to notify any connected views about changes to the model’s dimensions both before and after they occur:

• An insertRows() implementation must call beginInsertRows() before inserting new rows into the data structure, and endInsertRows() immediately afterwards .

• An insertColumns() implementation must call beginInsertColumns() before inserting new columns into the data structure, and endInsertColumns() immediately afterwards .

• A removeRows() implementation must call beginRemoveRows() before the rows are removed from the data structure, and endRemoveRows() immediately afterwards .

• A removeColumns() implementation must call beginRemoveColumns() before the columns are removed from the data structure, and endRemoveColumns() immediately afterwards .

private signals that these functions emit give attached components the chance to take action before any data becomes unavailable. The encapsulation of the insert and remove operations with these begin and end functions also enables the model to manage persistent model indexes correctly. If you want selections to be handled properly, you must ensure that you call these functions. If you insert or remove an item with children, you do not need to call these functions for the child items. In other words, the parent item will take care of its child items.

To create models that populate incrementally, you can reimplement fetchMore() and canFetchMore() . If the reimplementation of fetchMore() adds rows to the model, beginInsertRows() and endInsertRows() must be called.

另请参阅

模型类 模型子类化参考 QModelIndex QAbstractItemView 将拖放用于项视图 简单 DOM 模型范例 简单树模型范例 可编辑树模型范例 抓取更多范例

class QAbstractItemModel ( [ parent=None ] ) ¶

param parent

QObject

Constructs an abstract item model with the given parent .

PySide2.QtCore.QAbstractItemModel. LayoutChangeHint ¶

This enum describes the way the model changes layout.

常量	描述
QAbstractItemModel.NoLayoutChangeHint	No hint is available.
QAbstractItemModel.VerticalSortHint	Rows are being sorted.
QAbstractItemModel.HorizontalSortHint	Columns are being sorted.

Note that and carry the meaning that items are being moved within the same parent, not moved to a different parent in the model, and not filtered out or in.

PySide2.QtCore.QAbstractItemModel. CheckIndexOption ¶

This enum can be used to control the checks performed by checkIndex() .

常量	描述
QAbstractItemModel.CheckIndexOption.NoOption	No check options are specified.
QAbstractItemModel.CheckIndexOption.IndexIsValid	The model index passed to checkIndex() is checked to be a valid model index.
QAbstractItemModel.CheckIndexOption.DoNotUseParent	Does not perform any check involving the usage of the parent of the index passed to checkIndex() .
QAbstractItemModel.CheckIndexOption.ParentIsInvalid	The parent of the model index passed to checkIndex() is checked to be an invalid model index. If both this option and are specified, then this option is ignored.

PySide2.QtCore.QAbstractItemModel. beginInsertColumns ( parent , first , last ) ¶

参数

• parent – QModelIndex

• first – int

• last – int

Begins a column insertion operation.

When reimplementing insertColumns() in a subclass, you must call this function before inserting data into the model’s underlying data store.

parent index corresponds to the parent into which the new columns are inserted; first and last are the column numbers of the new columns will have after they have been inserted.

	Specify the first and last column numbers for the span of columns you want to insert into an item in a model. For example, as shown in the diagram, we insert three columns before column 4, so first is 4 and last is 6: beginInsertColumns(parent, 4, 6) This inserts the three new columns as columns 4, 5, and 6.
	To append columns, insert them after the last column. For example, as shown in the diagram, we append three columns to a collection of six existing columns (ending in column 5), so first is 6 and last is 8: beginInsertColumns(parent, 6, 8) This appends the two new columns as columns 6, 7, and 8.

注意

This function emits the columnsAboutToBeInserted() signal which connected views (or proxies) must handle before the data is inserted. Otherwise, the views may end up in an invalid state.

另请参阅

endInsertColumns()

PySide2.QtCore.QAbstractItemModel. beginInsertRows ( parent , first , last ) ¶

参数

• parent – QModelIndex

• first – int

• last – int

Begins a row insertion operation.

When reimplementing insertRows() in a subclass, you must call this function before inserting data into the model’s underlying data store.

parent index corresponds to the parent into which the new rows are inserted; first and last are the row numbers that the new rows will have after they have been inserted.

	Specify the first and last row numbers for the span of rows you want to insert into an item in a model. For example, as shown in the diagram, we insert three rows before row 2, so first is 2 and last is 4: beginInsertRows(parent, 2, 4) This inserts the three new rows as rows 2, 3, and 4.
	To append rows, insert them after the last row. For example, as shown in the diagram, we append two rows to a collection of 4 existing rows (ending in row 3), so first is 4 and last is 5: beginInsertRows(parent, 4, 5) This appends the two new rows as rows 4 and 5.

注意

This function emits the rowsAboutToBeInserted() signal which connected views (or proxies) must handle before the data is inserted. Otherwise, the views may end up in an invalid state.

另请参阅

endInsertRows()

PySide2.QtCore.QAbstractItemModel. beginMoveColumns ( sourceParent , sourceFirst , sourceLast , destinationParent , destinationColumn ) ¶

参数

• sourceParent – QModelIndex

• sourceFirst – int

• sourceLast – int

• destinationParent – QModelIndex

• destinationColumn – int

返回类型

bool

Begins a column move operation.

When reimplementing a subclass, this method simplifies moving entities in your model. This method is responsible for moving persistent indexes in the model, which you would otherwise be required to do yourself. Using and endMoveColumns is an alternative to emitting layoutAboutToBeChanged and layoutChanged directly along with changePersistentIndex .

sourceParent index corresponds to the parent from which the columns are moved; sourceFirst and sourceLast are the first and last column numbers of the columns to be moved. The destinationParent index corresponds to the parent into which those columns are moved. The destinationChild is the column to which the columns will be moved. That is, the index at column sourceFirst in sourceParent will become column destinationChild in destinationParent , followed by all other columns up to sourceLast .

However, when moving columns down in the same parent ( sourceParent and destinationParent are equal), the columns will be placed before the destinationChild index. That is, if you wish to move columns 0 and 1 so they will become columns 1 and 2, destinationChild should be 3. In this case, the new index for the source column i (which is between sourceFirst and sourceLast ) is equal to (destinationChild-sourceLast-1+i) .

注意：若 sourceParent and destinationParent are the same, you must ensure that the destinationChild is not within the range of sourceFirst and sourceLast + 1. You must also ensure that you do not attempt to move a column to one of its own children or ancestors. This method returns false if either condition is true, in which case you should abort your move operation.

另请参阅

endMoveColumns()

PySide2.QtCore.QAbstractItemModel. beginMoveRows ( sourceParent , sourceFirst , sourceLast , destinationParent , destinationRow ) ¶

参数

• sourceParent – QModelIndex

• sourceFirst – int

• sourceLast – int

• destinationParent – QModelIndex

• destinationRow – int

返回类型

bool

Begins a row move operation.

When reimplementing a subclass, this method simplifies moving entities in your model. This method is responsible for moving persistent indexes in the model, which you would otherwise be required to do yourself. Using and endMoveRows is an alternative to emitting layoutAboutToBeChanged and layoutChanged directly along with changePersistentIndex .

sourceParent index corresponds to the parent from which the rows are moved; sourceFirst and sourceLast are the first and last row numbers of the rows to be moved. The destinationParent index corresponds to the parent into which those rows are moved. The destinationChild is the row to which the rows will be moved. That is, the index at row sourceFirst in sourceParent will become row destinationChild in destinationParent , followed by all other rows up to sourceLast .

However, when moving rows down in the same parent ( sourceParent and destinationParent are equal), the rows will be placed before the destinationChild index. That is, if you wish to move rows 0 and 1 so they will become rows 1 and 2, destinationChild should be 3. In this case, the new index for the source row i (which is between sourceFirst and sourceLast ) is equal to (destinationChild-sourceLast-1+i) .

注意：若 sourceParent and destinationParent are the same, you must ensure that the destinationChild is not within the range of sourceFirst and sourceLast + 1. You must also ensure that you do not attempt to move a row to one of its own children or ancestors. This method returns false if either condition is true, in which case you should abort your move operation.

	Specify the first and last row numbers for the span of rows in the source parent you want to move in the model. Also specify the row in the destination parent to move the span to. For example, as shown in the diagram, we move three rows from row 2 to 4 in the source, so sourceFirst is 2 and sourceLast is 4. We move those items to above row 2 in the destination, so destinationChild is 2. beginMoveRows(sourceParent, 2, 4, destinationParent, 2) This moves the three rows rows 2, 3, and 4 in the source to become 2, 3 and 4 in the destination. Other affected siblings are displaced accordingly.
	To append rows to another parent, move them to after the last row. For example, as shown in the diagram, we move three rows to a collection of 6 existing rows (ending in row 5), so destinationChild is 6: beginMoveRows(sourceParent, 2, 4, destinationParent, 6) This moves the target rows to the end of the target parent as 6, 7 and 8.
	To move rows within the same parent, specify the row to move them to. For example, as shown in the diagram, we move one item from row 2 to row 0, so sourceFirst and sourceLast are 2 and destinationChild 为 0。 beginMoveRows(parent, 2, 2, parent, 0) Note that other rows may be displaced accordingly. Note also that when moving items within the same parent you should not attempt invalid or no-op moves. In the above example, item 2 is at row 2 before the move, so it cannot be moved to row 2 (where it is already) or row 3 (no-op as row 3 means above row 3, where it is already)
	To move rows within the same parent, specify the row to move them to. For example, as shown in the diagram, we move one item from row 2 to row 4, so sourceFirst and sourceLast are 2 and destinationChild is 4. beginMoveRows(parent, 2, 2, parent, 4) Note that other rows may be displaced accordingly.

另请参阅

endMoveRows()

PySide2.QtCore.QAbstractItemModel. beginRemoveColumns ( parent , first , last ) ¶

参数

• parent – QModelIndex

• first – int

• last – int

Begins a column removal operation.

When reimplementing removeColumns() in a subclass, you must call this function before removing data from the model’s underlying data store.

parent index corresponds to the parent from which the new columns are removed; first and last are the column numbers of the first and last columns to be removed.

Specify the first and last column numbers for the span of columns you want to remove from an item in a model. For example, as shown in the diagram, we remove the three columns from column 4 to column 6, so first is 4 and last is 6: beginRemoveColumns(parent, 4, 6)

注意

This function emits the columnsAboutToBeRemoved() signal which connected views (or proxies) must handle before the data is removed. Otherwise, the views may end up in an invalid state.

另请参阅

endRemoveColumns()

PySide2.QtCore.QAbstractItemModel. beginRemoveRows ( parent , first , last ) ¶

参数

• parent – QModelIndex

• first – int

• last – int

Begins a row removal operation.

When reimplementing removeRows() in a subclass, you must call this function before removing data from the model’s underlying data store.

parent index corresponds to the parent from which the new rows are removed; first and last are the row numbers of the rows to be removed.

Specify the first and last row numbers for the span of rows you want to remove from an item in a model. For example, as shown in the diagram, we remove the two rows from row 2 to row 3, so first is 2 and last is 3: beginRemoveRows(parent, 2, 3)

注意

This function emits the rowsAboutToBeRemoved() signal which connected views (or proxies) must handle before the data is removed. Otherwise, the views may end up in an invalid state.

另请参阅

endRemoveRows()

PySide2.QtCore.QAbstractItemModel. beginResetModel ( ) ¶

Begins a model reset operation.

A reset operation resets the model to its current state in any attached views.

注意

Any views attached to this model will be reset as well.

When a model is reset it means that any previous data reported from the model is now invalid and has to be queried for again. This also means that the current item and any selected items will become invalid.

When a model radically changes its data it can sometimes be easier to just call this function rather than emit dataChanged() to inform other components when the underlying data source, or its structure, has changed.

You must call this function before resetting any internal data structures in your model or proxy model.

This function emits the signal modelAboutToBeReset() .

另请参阅

modelAboutToBeReset() modelReset() endResetModel()

PySide2.QtCore.QAbstractItemModel. buddy ( index ) ¶

参数

index – QModelIndex

返回类型

QModelIndex

Returns a model index for the buddy of the item represented by index . When the user wants to edit an item, the view will call this function to check whether another item in the model should be edited instead. Then, the view will construct a delegate using the model index returned by the buddy item.

The default implementation of this function has each item as its own buddy.

PySide2.QtCore.QAbstractItemModel. canDropMimeData ( data , action , row , column , parent ) ¶

参数

• data – QMimeData

• action – DropAction

• row – int

• column – int

• parent – QModelIndex

返回类型

bool

返回 true if a model can accept a drop of the data . This default implementation only checks if data has at least one format in the list of mimeTypes() and if action is among the model’s supportedDropActions() .

Reimplement this function in your custom model, if you want to test whether the data can be dropped at row , column , parent with action . If you don’t need that test, it is not necessary to reimplement this function.

另请参阅

dropMimeData() 将拖放用于项视图

PySide2.QtCore.QAbstractItemModel. canFetchMore ( parent ) ¶

参数

parent – QModelIndex

返回类型

bool

返回 true if there is more data available for parent ；否则返回 false .

The default implementation always returns false .

If returns true ， fetchMore() function should be called. This is the behavior of QAbstractItemView , for example.

另请参阅

fetchMore()

PySide2.QtCore.QAbstractItemModel. changePersistentIndex ( from , to ) ¶

参数

• from – QModelIndex

• to – QModelIndex

改变 QPersistentModelIndex that is equal to the given from model index to the given to model index.

If no persistent model index equal to the given from model index was found, nothing is changed.

另请参阅

persistentIndexList() changePersistentIndexList()

PySide2.QtCore.QAbstractItemModel. changePersistentIndexList ( from , to ) ¶

参数

• from – QModelIndexList

• to – QModelIndexList

Changes the { QPersistentModelIndex }es that are equal to the indexes in the given from model index list to the given to model index list.

If no persistent model indexes equal to the indexes in the given from model index list are found, nothing is changed.

另请参阅

persistentIndexList() changePersistentIndex()

PySide2.QtCore.QAbstractItemModel. checkIndex ( index [ , options=CheckIndexOption.NoOption ] ) ¶

参数

• index – QModelIndex

• options – CheckIndexOptions

返回类型

bool

This function checks whether index is a legal model index for this model. A legal model index is either an invalid model index, or a valid model index for which all the following holds:

• the index’ model is this ;

• the index’ row is greater or equal than zero;

• the index’ row is less than the row count for the index’ parent;

• the index’ column is greater or equal than zero;

• the index’ column is less than the column count for the index’ parent.

options argument may change some of these checks. If options contains IndexIsValid ，那么 index must be a valid index; this is useful when reimplementing functions such as data() or setData() , which expect valid indexes.

若 options contains DoNotUseParent , then the checks that would call parent() are omitted; this allows calling this function from a parent() reimplementation (otherwise, this would result in endless recursion and a crash).

若 options does not contain DoNotUseParent , and it contains ParentIsInvalid , then an additional check is performed: the parent index is checked for not being valid. This is useful when implementing flat models such as lists or tables, where no model index should have a valid parent index.

This function returns true if all the checks succeeded, and false otherwise. This allows to use the function in Q_ASSERT and similar other debugging mechanisms. If some check failed, a warning message will be printed in the qt.core.qabstractitemmodel.checkindex logging category, containing some information that may be useful for debugging the failure.

注意

This function is a debugging helper for implementing your own item models. When developing complex models, as well as when building complicated model hierarchies (e.g. using proxy models), it is useful to call this function in order to catch bugs relative to illegal model indices (as defined above) accidentally passed to some QAbstractItemModel API.

警告

Note that it’s undefined behavior to pass illegal indices to item models, so applications must refrain from doing so, and not rely on any “defensive” programming that item models could employ to handle illegal indexes gracefully.

另请参阅

QModelIndex

PySide2.QtCore.QAbstractItemModel. columnCount ( [ parent=QModelIndex() ] ) ¶

参数

parent – QModelIndex

返回类型

int

Returns the number of columns for the children of the given parent .

In most subclasses, the number of columns is independent of the parent .

例如：

int DomModel::columnCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent);
    return 3;
}
												

注意

When implementing a table based model, should return 0 when the parent is valid.

另请参阅

rowCount()

PySide2.QtCore.QAbstractItemModel. createIndex ( row , column , ptr ) ¶

参数

• row – int

• column – int

• ptr – PyObject

返回类型

QModelIndex

Creates a model index for the given row and column with the internal pointer ptr.

When using a QSortFilterProxyModel, its indexes have their own internal pointer. It is not advisable to access this internal pointer outside of the model. Use the data() function instead. This function provides a consistent interface that model subclasses must use to create model indexes.

警告

Because of some Qt/Python itegration rules, the ptr argument do not get the reference incremented during the QModelIndex life time. So it is necessary to keep the object used on ptr argument alive during the whole process. Do not destroy the object if you are not sure about that.

PySide2.QtCore.QAbstractItemModel. createIndex ( row , column [ , id=0 ] ) ¶

参数

• row – int

• column – int

• id – quintptr

返回类型

QModelIndex

Creates a model index for the given row and column with the internal identifier, id .

This function provides a consistent interface that model subclasses must use to create model indexes.

另请参阅

internalId()

PySide2.QtCore.QAbstractItemModel. data ( index [ , role=Qt.DisplayRole ] ) ¶

参数

• index – QModelIndex

• role – int

返回类型

object

Returns the data stored under the given role for the item referred to by the index .

注意

If you do not have a value to return, return an invalid QVariant instead of returning 0.

另请参阅

ItemDataRole setData() headerData()

PySide2.QtCore.QAbstractItemModel. dataChanged ( topLeft , bottomRight [ , roles=list() ] ) ¶

参数

• topLeft – QModelIndex

• bottomRight – QModelIndex

• roles –

PySide2.QtCore.QAbstractItemModel. decodeData ( row , column , parent , stream ) ¶

参数

• row – int

• column – int

• parent – QModelIndex

• stream – QDataStream

返回类型

bool

PySide2.QtCore.QAbstractItemModel. dropMimeData ( data , action , row , column , parent ) ¶

参数

• data – QMimeData

• action – DropAction

• row – int

• column – int

• parent – QModelIndex

返回类型

bool

处理 data 提供通过拖放操作结束按给定 action .

返回 true if the data and action were handled by the model; otherwise returns false .

指定 row , column and parent indicate the location of an item in the model where the operation ended. It is the responsibility of the model to complete the action at the correct location.

For instance, a drop action on an item in a QTreeView can result in new items either being inserted as children of the item specified by row , column ，和 parent , or as siblings of the item.

当 row and column are -1 it means that the dropped data should be considered as dropped directly on parent . Usually this will mean appending the data as child items of parent 。若 row and column are greater than or equal zero, it means that the drop occurred just before the specified row and column 以指定 parent .

mimeTypes() member is called to get the list of acceptable MIME types. This default implementation assumes the default implementation of mimeTypes() , which returns a single default MIME type. If you reimplement mimeTypes() in your custom model to return multiple MIME types, you must reimplement this function to make use of them.

另请参阅

supportedDropActions() canDropMimeData() 将拖放用于项视图

PySide2.QtCore.QAbstractItemModel. encodeData ( indexes , stream ) ¶

参数

• indexes – QModelIndexList

• stream – QDataStream

PySide2.QtCore.QAbstractItemModel. endInsertColumns ( ) ¶

Ends a column insertion operation.

When reimplementing insertColumns() in a subclass, you must call this function after inserting data into the model’s underlying data store.

另请参阅

beginInsertColumns()

PySide2.QtCore.QAbstractItemModel. endInsertRows ( ) ¶

Ends a row insertion operation.

When reimplementing insertRows() in a subclass, you must call this function after inserting data into the model’s underlying data store.

另请参阅

beginInsertRows()

PySide2.QtCore.QAbstractItemModel. endMoveColumns ( ) ¶

Ends a column move operation.

When implementing a subclass, you must call this function after moving data within the model’s underlying data store.

另请参阅

beginMoveColumns()

PySide2.QtCore.QAbstractItemModel. endMoveRows ( ) ¶

Ends a row move operation.

When implementing a subclass, you must call this function after moving data within the model’s underlying data store.

另请参阅

beginMoveRows()

PySide2.QtCore.QAbstractItemModel. endRemoveColumns ( ) ¶

Ends a column removal operation.

When reimplementing removeColumns() in a subclass, you must call this function after removing data from the model’s underlying data store.

另请参阅

beginRemoveColumns()

PySide2.QtCore.QAbstractItemModel. endRemoveRows ( ) ¶

Ends a row removal operation.

When reimplementing removeRows() in a subclass, you must call this function after removing data from the model’s underlying data store.

另请参阅

beginRemoveRows()

PySide2.QtCore.QAbstractItemModel. endResetModel ( ) ¶

Completes a model reset operation.

You must call this function after resetting any internal data structure in your model or proxy model.

This function emits the signal modelReset() .

另请参阅

beginResetModel()

PySide2.QtCore.QAbstractItemModel. fetchMore ( parent ) ¶

参数

parent – QModelIndex

Fetches any available data for the items with the parent specified by the parent index.

Reimplement this if you are populating your model incrementally.

The default implementation does nothing.

另请参阅

canFetchMore()

PySide2.QtCore.QAbstractItemModel. flags ( index ) ¶

参数

index – QModelIndex

返回类型

ItemFlags

Returns the item flags for the given index .

The base class implementation returns a combination of flags that enables the item ( ItemIsEnabled ) and allows it to be selected ( ItemIsSelectable ).

另请参阅

ItemFlags

PySide2.QtCore.QAbstractItemModel. hasChildren ( [ parent=QModelIndex() ] ) ¶

参数

parent – QModelIndex

返回类型

bool

返回 true if parent has any children; otherwise returns false .

使用 rowCount() on the parent to find out the number of children.

Note that it is undefined behavior to report that a particular index with this method if the same index has the flag ItemNeverHasChildren set.

另请参阅

parent() index()

PySide2.QtCore.QAbstractItemModel. hasIndex ( row , column [ , parent=QModelIndex() ] ) ¶

参数

• row – int

• column – int

• parent – QModelIndex

返回类型

bool

返回 true if the model returns a valid QModelIndex for row and column with parent ，否则返回 false .

PySide2.QtCore.QAbstractItemModel. headerData ( section , orientation [ , role=Qt.DisplayRole ] ) ¶

参数

• section – int

• orientation – 取向

• role – int

返回类型

object

返回数据为给定 role and section in the header with the specified orientation .

For horizontal headers, the section number corresponds to the column number. Similarly, for vertical headers, the section number corresponds to the row number.

另请参阅

ItemDataRole setHeaderData() QHeaderView

PySide2.QtCore.QAbstractItemModel. headerDataChanged ( orientation , first , last ) ¶

参数

• orientation – 取向

• first – int

• last – int

PySide2.QtCore.QAbstractItemModel. index ( row , column [ , parent=QModelIndex() ] ) ¶

参数

• row – int

• column – int

• parent – QModelIndex

返回类型

QModelIndex

返回模型中的项索引，指定通过给定 row , column and parent index.

当在子类中重实现此函数时，调用 createIndex() to generate model indexes that other components can use to refer to items in your model.

另请参阅

createIndex()

PySide2.QtCore.QAbstractItemModel. insertColumn ( column [ , parent=QModelIndex() ] ) ¶

参数

• column – int

• parent – QModelIndex

返回类型

bool

Inserts a single column before the given column in the child items of the parent 指定。

返回 true if the column is inserted; otherwise returns false .

另请参阅

insertColumns() insertRow() removeColumn()

PySide2.QtCore.QAbstractItemModel. insertColumns ( column , count [ , parent=QModelIndex() ] ) ¶

参数

• column – int

• count – int

• parent – QModelIndex

返回类型

bool

On models that support this, inserts count new columns into the model before the given column . The items in each new column will be children of the item represented by the parent model index.

若 column is 0, the columns are prepended to any existing columns.

若 column is columnCount() , the columns are appended to any existing columns.

若 parent has no children, a single row with count columns is inserted.

返回 true if the columns were successfully inserted; otherwise returns false .

The base class implementation does nothing and returns false .

If you implement your own model, you can reimplement this function if you want to support insertions. Alternatively, you can provide your own API for altering the data.

另请参阅

insertRows() removeColumns() beginInsertColumns() endInsertColumns()

PySide2.QtCore.QAbstractItemModel. insertRow ( row [ , parent=QModelIndex() ] ) ¶

参数

• row – int

• parent – QModelIndex

返回类型

bool

Inserts a single row before the given row in the child items of the parent 指定。

注意

This function calls the virtual method insertRows .

返回 true if the row is inserted; otherwise returns false .

另请参阅

insertRows() insertColumn() removeRow()

PySide2.QtCore.QAbstractItemModel. insertRows ( row , count [ , parent=QModelIndex() ] ) ¶

参数

• row – int

• count – int

• parent – QModelIndex

返回类型

bool

注意

The base class implementation of this function does nothing and returns false .

On models that support this, inserts count rows into the model before the given row . Items in the new row will be children of the item represented by the parent model index.

若 row is 0, the rows are prepended to any existing rows in the parent.

若 row is rowCount() , the rows are appended to any existing rows in the parent.

若 parent has no children, a single column with count rows is inserted.

返回 true if the rows were successfully inserted; otherwise returns false .

If you implement your own model, you can reimplement this function if you want to support insertions. Alternatively, you can provide your own API for altering the data. In either case, you will need to call beginInsertRows() and endInsertRows() to notify other components that the model has changed.

另请参阅

insertColumns() removeRows() beginInsertRows() endInsertRows()

PySide2.QtCore.QAbstractItemModel. itemData ( index ) ¶

参数

index – QModelIndex

返回类型

Returns a map with values for all predefined roles in the model for the item at the given index .

Reimplement this function if you want to extend the default behavior of this function to include custom roles in the map.

另请参阅

setItemData() ItemDataRole data()

PySide2.QtCore.QAbstractItemModel. layoutAboutToBeChanged ( [ parents=list() [ , hint=QAbstractItemModel.NoLayoutChangeHint ] ] ) ¶

参数

• parents –

• hint – LayoutChangeHint

PySide2.QtCore.QAbstractItemModel. layoutChanged ( [ parents=list() [ , hint=QAbstractItemModel.NoLayoutChangeHint ] ] ) ¶

参数

• parents –

• hint – LayoutChangeHint

PySide2.QtCore.QAbstractItemModel. match ( start , role , value [ , hits=1 [ , flags=Qt.MatchFlags(Qt.MatchStartsWith|Qt.MatchWrap) ] ] ) ¶

参数

• start – QModelIndex

• role – int

• value – object

• hits – int

• flags – MatchFlags

返回类型

QModelIndexList

Returns a list of indexes for the items in the column of the start index where data stored under the given role matches the specified value . The way the search is performed is defined by the flags given. The list that is returned may be empty. Note also that the order of results in the list may not correspond to the order in the model, if for example a proxy model is used. The order of the results cannot be relied upon.

The search begins from the start index, and continues until the number of matching data items equals hits , the search reaches the last row, or the search reaches start again - depending on whether MatchWrap 指定在 flags . If you want to search for all matching items, use hits = -1.

By default, this function will perform a wrapping, string-based comparison on all items, searching for items that begin with the search term specified by value .

注意

The default implementation of this function only searches columns. Reimplement this function to include a different search behavior.

PySide2.QtCore.QAbstractItemModel. mimeData ( indexes ) ¶

参数

indexes – QModelIndexList

返回类型

QMimeData

Returns an object that contains serialized items of data corresponding to the list of indexes specified. The format used to describe the encoded data is obtained from the mimeTypes() function. This default implementation uses the default MIME type returned by the default implementation of mimeTypes() . If you reimplement mimeTypes() in your custom model to return more MIME types, reimplement this function to make use of them.

If the list of indexes is empty, or there are no supported MIME types, 0 is returned rather than a serialized empty list.

另请参阅

mimeTypes() dropMimeData()

PySide2.QtCore.QAbstractItemModel. mimeTypes ( ) ¶

返回类型

字符串列表

Returns the list of allowed MIME types. By default, the built-in models and views use an internal MIME type: application/x-qabstractitemmodeldatalist .

When implementing drag and drop support in a custom model, if you will return data in formats other than the default internal MIME type, reimplement this function to return your list of MIME types.

If you reimplement this function in your custom model, you must also reimplement the member functions that call it: mimeData() and dropMimeData() .

另请参阅

mimeData() dropMimeData()

PySide2.QtCore.QAbstractItemModel. moveColumn ( sourceParent , sourceColumn , destinationParent , destinationChild ) ¶

参数

• sourceParent – QModelIndex

• sourceColumn – int

• destinationParent – QModelIndex

• destinationChild – int

返回类型

bool

On models that support this, moves sourceColumn from sourceParent to destinationChild under destinationParent .

返回 true if the columns were successfully moved; otherwise returns false .

另请参阅

moveColumns() moveRow()

PySide2.QtCore.QAbstractItemModel. moveColumns ( sourceParent , sourceColumn , count , destinationParent , destinationChild ) ¶

参数

• sourceParent – QModelIndex

• sourceColumn – int

• count – int

• destinationParent – QModelIndex

• destinationChild – int

返回类型

bool

On models that support this, moves count columns starting with the given sourceColumn under parent sourceParent to column destinationChild under parent destinationParent .

返回 true if the columns were successfully moved; otherwise returns false .

The base class implementation does nothing and returns false .

If you implement your own model, you can reimplement this function if you want to support moving. Alternatively, you can provide your own API for altering the data.

另请参阅

beginMoveColumns() endMoveColumns()

PySide2.QtCore.QAbstractItemModel. moveRow ( sourceParent , sourceRow , destinationParent , destinationChild ) ¶

参数

• sourceParent – QModelIndex

• sourceRow – int

• destinationParent – QModelIndex

• destinationChild – int

返回类型

bool

On models that support this, moves sourceRow from sourceParent to destinationChild under destinationParent .

返回 true if the rows were successfully moved; otherwise returns false .

另请参阅

moveRows() moveColumn()

PySide2.QtCore.QAbstractItemModel. moveRows ( sourceParent , sourceRow , count , destinationParent , destinationChild ) ¶

参数

• sourceParent – QModelIndex

• sourceRow – int

• count – int

• destinationParent – QModelIndex

• destinationChild – int

返回类型

bool

On models that support this, moves count rows starting with the given sourceRow under parent sourceParent to row destinationChild under parent destinationParent .

返回 true if the rows were successfully moved; otherwise returns false .

The base class implementation does nothing and returns false .

If you implement your own model, you can reimplement this function if you want to support moving. Alternatively, you can provide your own API for altering the data.

另请参阅

beginMoveRows() endMoveRows()

PySide2.QtCore.QAbstractItemModel. parent ( child ) ¶

参数

child – QModelIndex

返回类型

QModelIndex

Returns the parent of the model item with the given index . If the item has no parent, an invalid QModelIndex 被返回。

A common convention used in models that expose tree data structures is that only items in the first column have children. For that case, when reimplementing this function in a subclass the column of the returned QModelIndex would be 0.

When reimplementing this function in a subclass, be careful to avoid calling QModelIndex member functions, such as parent() , since indexes belonging to your model will simply call your implementation, leading to infinite recursion.

另请参阅

createIndex()

PySide2.QtCore.QAbstractItemModel. persistentIndexList ( ) ¶

返回类型

QModelIndexList

Returns the list of indexes stored as persistent indexes in the model.

PySide2.QtCore.QAbstractItemModel. removeColumn ( column [ , parent=QModelIndex() ] ) ¶

参数

• column – int

• parent – QModelIndex

返回类型

bool

移除给定 column from the child items of the parent 指定。

返回 true if the column is removed; otherwise returns false .

另请参阅

removeColumns() removeRow() insertColumn()

PySide2.QtCore.QAbstractItemModel. removeColumns ( column , count [ , parent=QModelIndex() ] ) ¶

参数

• column – int

• count – int

• parent – QModelIndex

返回类型

bool

On models that support this, removes count columns starting with the given column under parent parent from the model.

返回 true if the columns were successfully removed; otherwise returns false .

The base class implementation does nothing and returns false .

If you implement your own model, you can reimplement this function if you want to support removing. Alternatively, you can provide your own API for altering the data.

另请参阅

removeColumn() removeRows() insertColumns() beginRemoveColumns() endRemoveColumns()

PySide2.QtCore.QAbstractItemModel. removeRow ( row [ , parent=QModelIndex() ] ) ¶

参数

• row – int

• parent – QModelIndex

返回类型

bool

移除给定 row from the child items of the parent 指定。

返回 true if the row is removed; otherwise returns false .

This is a convenience function that calls removeRows() 。 QAbstractItemModel implementation of removeRows() does nothing.

另请参阅

removeRows() removeColumn() insertRow()

PySide2.QtCore.QAbstractItemModel. removeRows ( row , count [ , parent=QModelIndex() ] ) ¶

参数

• row – int

• count – int

• parent – QModelIndex

返回类型

bool

On models that support this, removes count rows starting with the given row under parent parent from the model.

返回 true if the rows were successfully removed; otherwise returns false .

The base class implementation does nothing and returns false .

If you implement your own model, you can reimplement this function if you want to support removing. Alternatively, you can provide your own API for altering the data.

另请参阅

removeRow() removeColumns() insertColumns() beginRemoveRows() endRemoveRows()

PySide2.QtCore.QAbstractItemModel. resetInternalData ( ) ¶

This slot is called just after the internal data of a model is cleared while it is being reset.

This slot is provided the convenience of subclasses of concrete proxy models, such as subclasses of QSortFilterProxyModel which maintain extra data.

class CustomDataProxy : public QSortFilterProxyModel
{
    Q_OBJECT
public:
    CustomDataProxy(QObject *parent)
      : QSortFilterProxyModel(parent)
    {
    }
    ...
    QVariant data(const QModelIndex &index, int role) override
    {
        if (role != Qt::BackgroundRole)
            return QSortFilterProxyModel::data(index, role);
        if (m_customData.contains(index.row()))
            return m_customData.value(index.row());
        return QSortFilterProxyModel::data(index, role);
    }
private slots:
    void resetInternalData()
    {
        m_customData.clear();
    }
private:
  QHash<int, QVariant> m_customData;
};
												

注意

Due to a mistake, this slot is missing in Qt 5.0.

另请参阅

modelAboutToBeReset() modelReset()

PySide2.QtCore.QAbstractItemModel. revert ( ) ¶

Lets the model know that it should discard cached information. This function is typically used for row editing.

另请参阅

submit()

PySide2.QtCore.QAbstractItemModel. roleNames ( ) ¶

返回类型

Returns the model’s role names.

The default role names set by Qt are:

Qt Role	QML Role Name
DisplayRole	display
DecorationRole	decoration
EditRole	edit
ToolTipRole	toolTip
StatusTipRole	statusTip
WhatsThisRole	whatsThis

另请参阅

setRoleNames()

PySide2.QtCore.QAbstractItemModel. rowCount ( [ parent=QModelIndex() ] ) ¶

参数

parent – QModelIndex

返回类型

int

Returns the number of rows under the given parent . When the parent is valid it means that is returning the number of children of parent.

注意

When implementing a table based model, should return 0 when the parent is valid.

另请参阅

columnCount()

PySide2.QtCore.QAbstractItemModel. setData ( index , value [ , role=Qt.EditRole ] ) ¶

参数

• index – QModelIndex

• value – object

• role – int

返回类型

bool

设置 role data for the item at index to value .

返回 true 若成功；否则返回 false .

dataChanged() signal should be emitted if the data was successfully set.

The base class implementation returns false . This function and data() must be reimplemented for editable models.

另请参阅

ItemDataRole data() itemData()

PySide2.QtCore.QAbstractItemModel. setHeaderData ( section , orientation , value [ , role=Qt.EditRole ] ) ¶

参数

• section – int

• orientation – 取向

• value – object

• role – int

返回类型

bool

Sets the data for the given role and section in the header with the specified orientation 到 value 供给。

返回 true if the header’s data was updated; otherwise returns false .

When reimplementing this function, the headerDataChanged() signal must be emitted explicitly.

另请参阅

ItemDataRole headerData()

PySide2.QtCore.QAbstractItemModel. setItemData ( index , roles ) ¶

参数

• index – QModelIndex

• roles –

返回类型

bool

Sets the role data for the item at index to the associated value in roles , for every ItemDataRole .

返回 true 若成功；否则返回 false .

Roles that are not in roles will not be modified.

另请参阅

setData() data() itemData()

PySide2.QtCore.QAbstractItemModel. sibling ( row , column , idx ) ¶

参数

• row – int

• column – int

• idx – QModelIndex

返回类型

QModelIndex

Returns the sibling at row and column for the item at index , or an invalid QModelIndex if there is no sibling at that location.

is just a convenience function that finds the item’s parent, and uses it to retrieve the index of the child item in the specified row and column .

This method can optionally be overridden for implementation-specific optimization.

另请参阅

index() row() column()

PySide2.QtCore.QAbstractItemModel. sort ( column [ , order=Qt.AscendingOrder ] ) ¶

参数

• column – int

• order – SortOrder

Sorts the model by column 以给定 order .

基类实现什么都不做。

PySide2.QtCore.QAbstractItemModel. span ( index ) ¶

参数

index – QModelIndex

返回类型

QSize

Returns the row and column span of the item represented by index .

注意

Currently, span is not used.

PySide2.QtCore.QAbstractItemModel. submit ( ) ¶

返回类型

bool

Lets the model know that it should submit cached information to permanent storage. This function is typically used for row editing.

返回 true if there is no error; otherwise returns false .

另请参阅

revert()

PySide2.QtCore.QAbstractItemModel. supportedDragActions ( ) ¶

返回类型

DropActions

Returns the actions supported by the data in this model.

默认实现返回 supportedDropActions() . Reimplement this function if you wish to support additional actions.

is used by startDrag() as the default values when a drag occurs.

另请参阅

setSupportedDragActions() DropActions 将拖放用于项视图

PySide2.QtCore.QAbstractItemModel. supportedDropActions ( ) ¶

返回类型

DropActions

Returns the drop actions supported by this model.

默认实现返回 CopyAction . Reimplement this function if you wish to support additional actions. You must also reimplement the dropMimeData() function to handle the additional operations.

另请参阅

dropMimeData() DropActions 将拖放用于项视图