# QItemSelectionModel Class Reference
## [[QtGui](index.htm) module]
该QItemSelectionModel类跟踪视图的选定项目。[More...](#details)
继承[QObject](qobject.html)。
### Types
* `enum SelectionFlag { NoUpdate, Clear, Select, Deselect, ..., ClearAndSelect }`
* `class **[SelectionFlags](index.htm)**`
### Methods
* `__init__ (self, QAbstractItemModel model)`
* `__init__ (self, QAbstractItemModel model, QObject parent)`
* `clear (self)`
* `clearSelection (self)`
* `bool columnIntersectsSelection (self, int column, QModelIndex parent)`
* `QModelIndex currentIndex (self)`
* `emitSelectionChanged (self, QItemSelection newSelection, QItemSelection oldSelection)`
* `bool hasSelection (self)`
* `bool isColumnSelected (self, int column, QModelIndex parent)`
* `bool isRowSelected (self, int row, QModelIndex parent)`
* `bool isSelected (self, QModelIndex index)`
* `QAbstractItemModel model (self)`
* `reset (self)`
* `bool rowIntersectsSelection (self, int row, QModelIndex parent)`
* `select (self, QModelIndex index, SelectionFlags command)`
* `select (self, QItemSelection selection, SelectionFlags command)`
* `list-of-QModelIndex selectedColumns (self, int row = 0)`
* `list-of-QModelIndex selectedIndexes (self)`
* `list-of-QModelIndex selectedRows (self, int column = 0)`
* `QItemSelection selection (self)`
* `setCurrentIndex (self, QModelIndex index, SelectionFlags command)`
### Qt Signals
* `void currentChanged (const QModelIndex&,const QModelIndex&)`
* `void currentColumnChanged (const QModelIndex&,const QModelIndex&)`
* `void currentRowChanged (const QModelIndex&,const QModelIndex&)`
* `void selectionChanged (const QItemSelection&,const QItemSelection&)`
* * *
## Detailed Description
该QItemSelectionModel类跟踪视图的选定项目。
一个QItemSelectionModel跟踪选定的项目在一个视图或多个视图到同一个模型。它也跟踪当前所选项目的视图中。
该QItemSelectionModel类是一个[Model/View Classes](index.htm)并且是Qt的一部分[model/view framework](index.htm)。
所选择的项目,采用范围存储。每当你要修改的选定项目[select](qitemselectionmodel.html#select)( ),并提供任一[QItemSelection](qitemselection.html)或[QModelIndex](qmodelindex.html)和[QItemSelectionModel.SelectionFlag](qitemselectionmodel.html#SelectionFlag-enum)。
该QItemSelectionModel需要一个两层的方法来选择管理,处理已提交双方选定的项目,并且是当前选择的一部分项目。在当前选择的项目是当前交互的选择(例如用橡皮筋选择或键盘移位的选择)的一部分。
要更新当前选定的项目,使用或按位[QItemSelectionModel.Current](qitemselectionmodel.html#SelectionFlag-enum)和任何其它的[SelectionFlags](qitemselectionmodel.html#SelectionFlag-enum)。如果省略了[QItemSelectionModel.Current](qitemselectionmodel.html#SelectionFlag-enum)命令,新的当前选择将被创建,并且前一个加入到整个选择。所有的功能在两个层次上作业,例如, selectedItems ( )将从两个层返回的项目。
* * *
## Type Documentation
```
QItemSelectionModel.SelectionFlag
```
这个枚举变量描述的方式选择模型将被更新。
| Constant | Value | Description |
| --- | --- | --- |
| `QItemSelectionModel.NoUpdate` | `0x0000` | 没有选择将会作出修改。 |
| `QItemSelectionModel.Clear` | `0x0001` | 完整的选择将被清零。 |
| `QItemSelectionModel.Select` | `0x0002` | 所有指定的索引将被选中。 |
| `QItemSelectionModel.Deselect` | `0x0004` | 所有指定的索引将被取消。 |
| `QItemSelectionModel.Toggle` | `0x0008` | 所有指定的索引将被选择或取消选择取决于它们的当前状态。 |
| `QItemSelectionModel.Current` | `0x0010` | 当前的选择将被更新。 |
| `QItemSelectionModel.Rows` | `0x0020` | 所有索引将扩大到跨越行。 |
| `QItemSelectionModel.Columns` | `0x0040` | 所有索引将扩大到跨列。 |
| `QItemSelectionModel.SelectCurrent` | `Select | Current` | 选择和电流的组合,提供了方便。 |
| `QItemSelectionModel.ToggleCurrent` | `Toggle | Current` | 切换和电流的组合,提供了方便。 |
| `QItemSelectionModel.ClearAndSelect` | `Clear | Select` | 清除和选择的组合,提供了方便。 |
该SelectionFlags类型是一个typedef为[QFlags](index.htm)\u003cSelectionFlag\u003e 。它存储SelectionFlag值的或组合。
* * *
## Method Documentation
```
QItemSelectionModel.__init__ (self, QAbstractItemModel model)
```
构造一个运行在指定项目的选择模型_model_。
```
QItemSelectionModel.__init__ (self, QAbstractItemModel model, QObject parent)
```
该_parent_的说法,如果不是没有,原因_self_通过Qt的,而不是PyQt的拥有。
构造一个运行在指定项目的选择模型_model_同_parent_。
```
QItemSelectionModel.clear (self)
```
这种方法也是一个Qt槽与C + +的签名`void clear()`。
清除选择模型。发射[selectionChanged](qitemselectionmodel.html#selectionChanged)()和[currentChanged](qitemselectionmodel.html#currentChanged)( ) 。
```
QItemSelectionModel.clearSelection (self)
```
这种方法也是一个Qt槽与C + +的签名`void clearSelection()`。
清除选择中的选择模型。发射[selectionChanged](qitemselectionmodel.html#selectionChanged)( ) 。
这个函数中引入了Qt 4.2中。
```
bool QItemSelectionModel.columnIntersectsSelection (self, int column, QModelIndex parent)
```
如果在所选择的任何项目,则返回True_column_用给定的_parent_。
```
QModelIndex QItemSelectionModel.currentIndex (self)
```
[
返回模型项指数目前的项目,或无效的索引,如果没有当前项目。
](qmodelindex.html)
[**See also**](qmodelindex.html) [setCurrentIndex](qitemselectionmodel.html#setCurrentIndex)( ) 。
```
QItemSelectionModel.emitSelectionChanged (self, QItemSelection newSelection, QItemSelection oldSelection)
```
比较了两种选择_newSelection_和_oldSelection_并发出[selectionChanged](qitemselectionmodel.html#selectionChanged)( )与取消和选定的项目。
```
bool QItemSelectionModel.hasSelection (self)
```
返回True如果选择模型中包含的任何选择的范围,否则返回False 。
这个函数中引入了Qt 4.2中。
```
bool QItemSelectionModel.isColumnSelected (self, int column, QModelIndex parent)
```
如果所有项目中被选中,则返回True_column_用给定的_parent_。
注意,这个函数通常比调用更快[isSelected](qitemselectionmodel.html#isSelected)()在同一列中,并且所有的项目不可选择的数据项都被忽略。
```
bool QItemSelectionModel.isRowSelected (self, int row, QModelIndex parent)
```
如果所有项目中被选中,则返回True_row_用给定的_parent_。
注意,这个函数通常比调用更快[isSelected](qitemselectionmodel.html#isSelected)()在同一行和所有项目不可选择的数据项都被忽略。
```
bool QItemSelectionModel.isSelected (self, QModelIndex index)
```
返回True如果给定的模型项目_index_被选中。
```
QAbstractItemModel QItemSelectionModel.model (self)
```
[
返回由选择模型上操作的项目模型。
```
QItemSelectionModel.reset (self)
```
这种方法也是一个Qt槽与C + +的签名`void reset()`。
清除选择模型。不发射任何信号。
```
bool QItemSelectionModel.rowIntersectsSelection (self, int row, QModelIndex parent)
```
如果在所选择的任何项目,则返回True_row_用给定的_parent_。
```
QItemSelectionModel.select (self, QModelIndex index, SelectionFlags command)
```
这种方法也是一个Qt槽与C + +的签名`void select(const QModelIndex&,QItemSelectionModel::SelectionFlags)`。
](qabstractitemmodel.html)
[选择模型项目_index_使用指定的_command_,并发射](qabstractitemmodel.html)[selectionChanged](qitemselectionmodel.html#selectionChanged)( ) 。
**See also** [QItemSelectionModel.SelectionFlags](qitemselectionmodel.html#SelectionFlag-enum)。
```
QItemSelectionModel.select (self, QItemSelection selection, SelectionFlags command)
```
这种方法也是一个Qt槽与C + +的签名`void select(const QItemSelection&,QItemSelectionModel::SelectionFlags)`。
选择项目_selection_使用指定的_command_,并发射[selectionChanged](qitemselectionmodel.html#selectionChanged)( ) 。
**See also** [QItemSelectionModel.SelectionFlag](qitemselectionmodel.html#SelectionFlag-enum)。
```
list-of-QModelIndex QItemSelectionModel.selectedColumns (self, int row = 0)
```
返回该索引中的给定_row_对其中所有行被选中的列。
这个函数中引入了Qt 4.2中。
**See also** [selectedIndexes](qitemselectionmodel.html#selectedIndexes)()和[selectedRows](qitemselectionmodel.html#selectedRows)( ) 。
```
list-of-QModelIndex QItemSelectionModel.selectedIndexes (self)
```
返回所有选定的模型项目索引的列表。该列表包含没有重复,并没有排序。
```
list-of-QModelIndex QItemSelectionModel.selectedRows (self, int column = 0)
```
返回该索引中的给定_column_对所有列被选中的行。
这个函数中引入了Qt 4.2中。
**See also** [selectedIndexes](qitemselectionmodel.html#selectedIndexes)()和[selectedColumns](qitemselectionmodel.html#selectedColumns)( ) 。
```
QItemSelection QItemSelectionModel.selection (self)
```
[
返回存储在选择模型的选择范围。
```
QItemSelectionModel.setCurrentIndex (self, QModelIndex index, SelectionFlags command)
```
这种方法也是一个Qt槽与C + +的签名`void setCurrentIndex(const QModelIndex&,QItemSelectionModel::SelectionFlags)`。
](qitemselection.html)
[设定模型项目_index_为当前项目,并发射](qitemselection.html)[currentChanged](qitemselectionmodel.html#currentChanged)( ) 。目前项目用于键盘导航和焦点指示,它是独立于任何选定的项目,虽然选择的项目也可以是当前项目。
根据指定的_command_时,_index_也可以成为当前选择的一部分。
**See also** [currentIndex](qitemselectionmodel.html#currentIndex)()和[select](qitemselectionmodel.html#select)( ) 。
* * *
## Qt Signal Documentation
```
void currentChanged (const QModelIndex&,const QModelIndex&)
```
这是该信号的默认超载。
这个信号被发射时的当前项的变化。该_previous_模型项目指标被替换_current_指标作为选择的当前项。
请注意,当产品模型被重新设定此信号将不被发射。
**See also** [currentIndex](qitemselectionmodel.html#currentIndex)( )[setCurrentIndex](qitemselectionmodel.html#setCurrentIndex)()和[selectionChanged](qitemselectionmodel.html#selectionChanged)( ) 。
```
void currentColumnChanged (const QModelIndex&,const QModelIndex&)
```
这是该信号的默认超载。
这个信号被发射,如果_current_项目的变化和它的列是不同的列_previous_目前的项目。
请注意,当产品模型被重新设定此信号将不被发射。
**See also** [currentChanged](qitemselectionmodel.html#currentChanged)( )[currentRowChanged](qitemselectionmodel.html#currentRowChanged)( )[currentIndex](qitemselectionmodel.html#currentIndex)()和[setCurrentIndex](qitemselectionmodel.html#setCurrentIndex)( ) 。
```
void currentRowChanged (const QModelIndex&,const QModelIndex&)
```
这是该信号的默认超载。
这个信号被发射,如果_current_项目的变化和它的行是不同的行_previous_目前的项目。
请注意,当产品模型被重新设定此信号将不被发射。
**See also** [currentChanged](qitemselectionmodel.html#currentChanged)( )[currentColumnChanged](qitemselectionmodel.html#currentColumnChanged)( )[currentIndex](qitemselectionmodel.html#currentIndex)()和[setCurrentIndex](qitemselectionmodel.html#setCurrentIndex)( ) 。
```
void selectionChanged (const QItemSelection&,const QItemSelection&)
```
这是该信号的默认超载。
这个信号被发射时的选择改变。在选择的变化被表示为一个项目的选择_deselected_项目和项目的选择_selected_项目。
请注意,目前指数从选择独立的变化。还要注意的是,当该项目模型复位这个信号将不发射。
**See also** [select](qitemselectionmodel.html#select)()和[currentChanged](qitemselectionmodel.html#currentChanged)( ) 。
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- QScriptEngineDebugger Class Reference
- QScriptString Class Reference
- QScriptSyntaxCheckResult Class Reference
- QScriptValue Class Reference
- QScriptValueIterator Class Reference
- QScrollArea Class Reference
- QScrollBar Class Reference
- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译:Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- 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