# QItemSelection Class Reference
## [[QtGui](index.htm) module]
该QItemSelection类管理有关模型中的选定项目的信息。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, QModelIndex topLeft, QModelIndex bottomRight)`
* `__init__ (self, QItemSelection)`
* `append (self, QItemSelectionRange range)`
* `clear (self)`
* `bool contains (self, QModelIndex index)`
* `int count (self, QItemSelectionRange range)`
* `int count (self)`
* `QItemSelectionRange first (self)`
* `list-of-QModelIndex indexes (self)`
* `int indexOf (self, QItemSelectionRange value, int from = 0)`
* `insert (self, int i, QItemSelectionRange range)`
* `bool isEmpty (self)`
* `QItemSelectionRange last (self)`
* `int lastIndexOf (self, QItemSelectionRange value, int from = -1)`
* `merge (self, QItemSelection other, QItemSelectionModel.SelectionFlags command)`
* `move (self, int from, int to)`
* `prepend (self, QItemSelectionRange range)`
* `int removeAll (self, QItemSelectionRange range)`
* `removeAt (self, int i)`
* `replace (self, int i, QItemSelectionRange range)`
* `select (self, QModelIndex topLeft, QModelIndex bottomRight)`
* `swap (self, int i, int j)`
* `QItemSelectionRange takeAt (self, int i)`
* `QItemSelectionRange takeFirst (self)`
* `QItemSelectionRange takeLast (self)`
### Static Methods
* `split (QItemSelectionRange range, QItemSelectionRange other, QItemSelection result)`
### Special Methods
* `int __contains__ (self, QModelIndex index)`
* `__delitem__ (self, int i)`
* `__delitem__ (self, slice slice)`
* `bool __eq__ (self, QItemSelection other)`
* `QItemSelectionRange __getitem__ (self, int i)`
* `QItemSelection __getitem__ (self, slice slice)`
* `QItemSelection __iadd__ (self, QItemSelection other)`
* `QItemSelection __iadd__ (self, QItemSelectionRange value)`
* `__len__ (self)`
* `bool __ne__ (self, QItemSelection other)`
* `__setitem__ (self, int i, QItemSelectionRange range)`
* `__setitem__ (self, slice slice, QItemSelection list)`
* * *
## Detailed Description
该QItemSelection类管理有关模型中的选定项目的信息。
甲QItemSelection描述在已经由用户选择的模式中的项目。一个QItemSelection基本上是选择范围列表,请参阅[QItemSelectionRange](qitemselectionrange.html)。它提供了用于创建和操作选择,并从模型中选择一个范围内的项目。
该QItemSelection类是一个[Model/View Classes](index.htm)并且是Qt的一部分[model/view framework](index.htm)。
项目选择可以构造并初始化为包含范围从现有的模型项目。下面的示例构造一个包含从给定的各类物品的选择`model`,开始在`topLeft`,和结束的`bottomRight`。
```
QItemSelection *selection = new QItemSelection(topLeft, bottomRight);
```
一个空的项目选择可以构造,后来填充的要求。因此,如果模型要当我们构建了项目选择为不可用,我们可以重写上面的代码中的方法如下:
```
QItemSelection *selection = new QItemSelection();
...
selection->select(topLeft, bottomRight);
```
QItemSelection节省内存,并避免不必要的工作,通过与选择范围工作,而不是记录的模型项目的索引为每个项目中选择。一般来说,这个类的实例将包含非重叠选择范围的列表。
使用[merge](qitemselection.html#merge)( )合并一个项目的选择到另一个未做重叠的范围。使用[split](qitemselection.html#split)( )的基础上另外一个选择范围分割一个选择范围为更小的范围。
* * *
## Method Documentation
```
QItemSelection.__init__ (self)
```
构造一个空的选择。
```
QItemSelection.__init__ (self, QModelIndex topLeft, QModelIndex bottomRight)
```
构造一个项目选择,从左上角模型项目延伸,由指定的_topLeft_指数,在右下角项目,由指定的_bottomRight_。
```
QItemSelection.__init__ (self, QItemSelection)
```
```
QItemSelection.append (self, QItemSelectionRange range)
```
```
QItemSelection.clear (self)
```
```
bool QItemSelection.contains (self, QModelIndex index)
```
如果选择包含给定的,则返回True_index_否则返回False 。
```
int QItemSelection.count (self, QItemSelectionRange range)
```
```
int QItemSelection.count (self)
```
```
QItemSelectionRange QItemSelection.first (self)
```
[
```
list-of-QModelIndex QItemSelection.indexes (self)
```
返回对应于所选择的项的模型索引的列表。
```
int QItemSelection.indexOf (self, QItemSelectionRange value, int from = 0)
```
```
QItemSelection.insert (self, int i, QItemSelectionRange range)
```
```
bool QItemSelection.isEmpty (self)
```
](qitemselectionrange.html)
```
QItemSelectionRange QItemSelection.last (self)
```
[
```
int QItemSelection.lastIndexOf (self, QItemSelectionRange value, int from = -1)
```
```
QItemSelection.merge (self, QItemSelection other, QItemSelectionModel.SelectionFlags command)
```
](qitemselectionrange.html)
[合并的_other_选择与此](qitemselectionrange.html)[QItemSelection](qitemselection.html)使用_command_给出。这种方法保证了没有范围是重叠的。
请注意,只有[QItemSelectionModel.Select](qitemselectionmodel.html#SelectionFlag-enum),[QItemSelectionModel.Deselect](qitemselectionmodel.html#SelectionFlag-enum)和[QItemSelectionModel.Toggle](qitemselectionmodel.html#SelectionFlag-enum)被支持。
**See also** [split](qitemselection.html#split)( ) 。
```
QItemSelection.move (self, int from, int to)
```
```
QItemSelection.prepend (self, QItemSelectionRange range)
```
```
int QItemSelection.removeAll (self, QItemSelectionRange range)
```
```
QItemSelection.removeAt (self, int i)
```
```
QItemSelection.replace (self, int i, QItemSelectionRange range)
```
```
QItemSelection.select (self, QModelIndex topLeft, QModelIndex bottomRight)
```
添加该范围中的项目,从左上角的模型项上延伸,由指定的_topLeft_指数,在右下角项目,由指定的_bottomRight_到列表中。
**Note:** _topLeft_和_bottomRight_必须具有相同的父代。
```
QItemSelection.split (QItemSelectionRange range, QItemSelectionRange other, QItemSelection result)
```
拆分选择_range_使用选择_other_范围。在删除所有项目_other_从_range_并将该结果_result_。这可以用的语义进行比较_subtract_的一组操作。
**See also** [merge](qitemselection.html#merge)( ) 。
```
QItemSelection.swap (self, int i, int j)
```
```
QItemSelectionRange QItemSelection.takeAt (self, int i)
```
[](qitemselectionrange.html)
```
QItemSelectionRange QItemSelection.takeFirst (self)
```
[](qitemselectionrange.html)
```
QItemSelectionRange QItemSelection.takeLast (self)
```
[
```
int QItemSelection.__contains__ (self, QModelIndex index)
```
```
QItemSelection.__delitem__ (self, int i)
```
```
QItemSelection.__delitem__ (self, slice slice)
```
```
bool QItemSelection.__eq__ (self, QItemSelection other)
```
](qitemselectionrange.html)
```
QItemSelectionRange QItemSelection.__getitem__ (self, int i)
```
[](qitemselectionrange.html)
```
QItemSelection QItemSelection.__getitem__ (self, slice slice)
```
[](qitemselection.html)
```
QItemSelection QItemSelection.__iadd__ (self, QItemSelection other)
```
[](qitemselection.html)
```
QItemSelection QItemSelection.__iadd__ (self, QItemSelectionRange value)
```
[
```
QItemSelection.__len__ (self)
```
```
bool QItemSelection.__ne__ (self, QItemSelection other)
```
```
QItemSelection.__setitem__ (self, int i, QItemSelectionRange range)
```
```
QItemSelection.__setitem__ (self, slice slice, QItemSelection list)
```
](qitemselection.html)
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- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference