# QTextBlock Class Reference
## [[QtGui](index.htm) module]
该QTextBlock类提供一个容器，用于文本片段中[QTextDocument](qtextdocument.html)。[More...](#details)
### Types
* `class **[iterator](index.htm)**`
### Methods
* `__init__ (self)`
* `__init__ (self, QTextBlock o)`
* `iterator begin (self)`
* `QTextBlockFormat blockFormat (self)`
* `int blockFormatIndex (self)`
* `int blockNumber (self)`
* `QTextCharFormat charFormat (self)`
* `int charFormatIndex (self)`
* `clearLayout (self)`
* `bool contains (self, int position)`
* `QTextDocument document (self)`
* `iterator end (self)`
* `int firstLineNumber (self)`
* `bool isValid (self)`
* `bool isVisible (self)`
* `QTextLayout layout (self)`
* `int length (self)`
* `int lineCount (self)`
* `QTextBlock next (self)`
* `int position (self)`
* `QTextBlock previous (self)`
* `int revision (self)`
* `setLineCount (self, int count)`
* `setRevision (self, int rev)`
* `setUserData (self, QTextBlockUserData data)`
* `setUserState (self, int state)`
* `setVisible (self, bool visible)`
* `QString text (self)`
* `Qt.LayoutDirection textDirection (self)`
* `QTextList textList (self)`
* `QTextBlockUserData userData (self)`
* `int userState (self)`
### Special Methods
* `bool __eq__ (self, QTextBlock o)`
* `bool __ge__ (self, QTextBlock o)`
* `bool __lt__ (self, QTextBlock o)`
* `bool __ne__ (self, QTextBlock o)`
* * *
## Detailed Description
该QTextBlock类提供一个容器，用于文本片段中[QTextDocument](qtextdocument.html)。
文字块封装在一个块或一段文字[QTextDocument](qtextdocument.html)。 QTextBlock提供QTextDocuments块/段落结构进行只读访问。主要的是使用，如果你想实现自己的布局的可视化表示形式[QTextDocument](qtextdocument.html)，或者如果您想遍历一个文件，写出来的内容在自己的自定义格式。
文本块通过它们的父文件创建的。如果你需要创建一个新的文本块，或修改文件的内容，同时检查其内容，使用所提供的基于指针的接口[QTextCursor](qtextcursor.html)代替。
每个文本块位于一个特定的[position](qtextblock.html#position)在（）[document](qtextblock.html#document)（ ） 。该块的内容可以通过使用所获得的[text](qtextblock.html#text)（）函数。该[length](qtextblock.html#length)（ ）函数确定文件（包括格式化字符）中的块的大小。块的可视属性是由它的文本确定[layout](qtextblock.html#layout)（） ，其[charFormat](qtextblock.html#charFormat)（） ，和其[blockFormat](qtextblock.html#blockFormat)（ ） 。
该[next](qtextblock.html#next)（）和[previous](qtextblock.html#previous)（ ）函数使迭代连续有效块一份文件，该文件是由其他途径在迭代过程中不被修改的情况下。需要注意的是，虽然块序列中返回，相邻块可能来自于文件结构不同的地方。块的有效性可以通过调用确定[isValid](qtextblock.html#isValid)（ ） 。
QTextBlock提供了比较操作符，使其更容易与块工作：[operator==](qtextblock.html#operator-eq-eq)（ ）比较两个块是否相等，[operator!=](qtextblock.html#operator-not-eq)（ ）比较两个街区的不平等，[operator<](qtextblock.html#operator-lt)（ ）确定数据块是否先于在同一文档中的另一个。
* * *
## Method Documentation
```
QTextBlock.__init__ (self)
```
副本_other_文本块的属性到这个文本块。
```
QTextBlock.__init__ (self, QTextBlock o)
```
```
iterator QTextBlock.begin (self)
```
[
返回一个文本块迭代器，指向文本块的开始。
](index.htm)
[**See also**](index.htm) [end](qtextblock.html#end)（ ） 。
```
QTextBlockFormat QTextBlock.blockFormat (self)
```
[](qtextblockformat.html)
[返回](qtextblockformat.html)[QTextBlockFormat](qtextblockformat.html)描述块特定的属性。
**See also** [charFormat](qtextblock.html#charFormat)（ ） 。
```
int QTextBlock.blockFormatIndex (self)
```
返回一个索引到文档内部的块格式的文本块的格式列表。
**See also** [QTextDocument.allFormats](qtextdocument.html#allFormats)（ ） 。
```
int QTextBlock.blockNumber (self)
```
返回此块的数量，或-1，如果块是无效的。
此功能被引入Qt的4.4 。
**See also** [QTextCursor.blockNumber](qtextcursor.html#blockNumber)（ ） 。
```
QTextCharFormat QTextBlock.charFormat (self)
```
[](qtextcharformat.html)
[返回](qtextcharformat.html)[QTextCharFormat](qtextcharformat.html)描述块的字符格式。插入文本到一个空的块时，块的字符格式。
**See also** [blockFormat](qtextblock.html#blockFormat)（ ） 。
```
int QTextBlock.charFormatIndex (self)
```
返回一个索引到文档内部的字符格式的文本块的字符格式列表。
**See also** [QTextDocument.allFormats](qtextdocument.html#allFormats)（ ） 。
```
QTextBlock.clearLayout (self)
```
清除[QTextLayout](qtextlayout.html)用来布局和显示模块的内容。
此功能被引入Qt的4.4 。
**See also** [layout](qtextblock.html#layout)（ ） 。
```
bool QTextBlock.contains (self, int position)
```
返回True如果给定的_position_位于文本块中，否则返回False 。
```
QTextDocument QTextBlock.document (self)
```
[
返回该文本块属于文本文件，或者0，如果该文本块不属于任何文件。
](qtextdocument.html)
```
iterator QTextBlock.end (self)
```
[
返回一个文本块迭代器，指向文本块的结尾。
](index.htm)
[**See also**](index.htm) [begin](qtextblock.html#begin)（ ）[next](qtextblock.html#next)（）和[previous](qtextblock.html#previous)（ ） 。
```
int QTextBlock.firstLineNumber (self)
```
返回该块的第一行号，或-1，如果该块是无效的。除非布局支持它，行号是相同的块数。
此功能被引入Qt的4.5 。
**See also** [QTextBlock.blockNumber](qtextblock.html#blockNumber)（ ） 。
```
bool QTextBlock.isValid (self)
```
返回True如果该文本块是有效的，否则返回False 。
```
bool QTextBlock.isVisible (self)
```
返回True如果该块是可见的，否则返回False 。
此功能被引入Qt的4.4 。
**See also** [setVisible](qtextblock.html#setVisible)（ ） 。
```
QTextLayout QTextBlock.layout (self)
```
[](qtextlayout.html)
[返回](qtextlayout.html)[QTextLayout](qtextlayout.html)用来布局和显示模块的内容。
注意，返回[QTextLayout](qtextlayout.html)对象只能从documentChanged实现的一种变型[QAbstractTextDocumentLayout](qabstracttextdocumentlayout.html)子类。从外部原因未定义的行为施加的任何更改。
**See also** [clearLayout](qtextblock.html#clearLayout)（ ） 。
```
int QTextBlock.length (self)
```
返回字符的块的长度。
**Note:**返回的长度包括所有格式的字符，例如，换行符。
**See also** [text](qtextblock.html#text)（ ）[charFormat](qtextblock.html#charFormat)（）和[blockFormat](qtextblock.html#blockFormat)（ ） 。
```
int QTextBlock.lineCount (self)
```
返回的行数。不是所有的文件布局支持此功能。
此功能被引入Qt的4.5 。
**See also** [setLineCount](qtextblock.html#setLineCount)（ ） 。
```
QTextBlock QTextBlock.next (self)
```
[
返回文档中的文本块这个块后，或者一个空的文本块，如果这是最后一个。
注意，下一个块可以是在不同的帧或表本块。
](qtextblock.html)
[**See also**](qtextblock.html) [previous](qtextblock.html#previous)（ ）[begin](qtextblock.html#begin)（）和[end](qtextblock.html#end)（ ） 。
```
int QTextBlock.position (self)
```
返回的文档内的块的第一个字符的索引。
```
QTextBlock QTextBlock.previous (self)
```
[
返回文档中的文本块这个块之前，或者一个空的文本块，如果这是第一个。
注意，下一个块可以是在不同的帧或表本块。
](qtextblock.html)
[**See also**](qtextblock.html) [next](qtextblock.html#next)（ ）[begin](qtextblock.html#begin)（）和[end](qtextblock.html#end)（ ） 。
```
int QTextBlock.revision (self)
```
返回的块版本。
此功能被引入Qt的4.4 。
**See also** [setRevision](qtextblock.html#setRevision)（）和[QTextDocument.revision](qtextdocument.html#revision)（ ） 。
```
QTextBlock.setLineCount (self, int count)
```
设置行计数_count_。
此功能被引入Qt的4.5 。
**See also** [lineCount](qtextblock.html#lineCount)（ ） 。
```
QTextBlock.setRevision (self, int rev)
```
设置一个块修订_rev_。
此功能被引入Qt的4.4 。
**See also** [revision](qtextblock.html#revision)（）和[QTextDocument.revision](qtextdocument.html#revision)（ ） 。
```
QTextBlock.setUserData (self, QTextBlockUserData data)
```
重视给定的_data_反对的文本块。
[QTextBlockUserData](qtextblockuserdata.html)可以用来存储自定义设置。所有权被传递到下面的文本文件，即提供[QTextBlockUserData](qtextblockuserdata.html)如果相应的文本块被删除的对象将被删除。用户数据对象未存储在还原历史，所以撤消删除的文本块后，将无法使用。
例如，如果你写了一个程序编辑器中的IDE ，你可能想让你的用户设置断点视觉代码中的一个集成的调试器。在程序编辑器的文本行通常对应于一个[QTextBlock](qtextblock.html)。该[QTextBlockUserData](qtextblockuserdata.html)接口允许开发者存储数据的每个[QTextBlock](qtextblock.html)一样，例如在其中的源代码行的用户有一个断点集。当然，这也可以被存储在外部，但是通过将其存储在内部[QTextDocument](qtextdocument.html)，将例如自动当用户删除与其相关的行删除。这真的只是一种方法，在存储自定义信息[QTextDocument](qtextdocument.html)在不使用自定义属性[QTextFormat](qtextformat.html)这会影响撤销/重做堆栈。
这个函数是Qt 4.1中引入。
**See also** [userData](qtextblock.html#userData)（ ） 。
```
QTextBlock.setUserState (self, int state)
```
在指定的商店_state_在文本块的整数值。这可能是有用的，例如在一个语法高亮显示来存储文本解析状态。
这个函数是Qt 4.1中引入。
**See also** [userState](qtextblock.html#userState)（ ） 。
```
QTextBlock.setVisible (self, bool visible)
```
设置块的可见性_visible_。
此功能被引入Qt的4.4 。
**See also** [isVisible](qtextblock.html#isVisible)（ ） 。
```
QString QTextBlock.text (self)
```
返回块的内容为纯文本。
**See also** [length](qtextblock.html#length)（ ）[charFormat](qtextblock.html#charFormat)（）和[blockFormat](qtextblock.html#blockFormat)（ ） 。
```
Qt.LayoutDirection QTextBlock.textDirection (self)
```
[
返回解析文字方向。
](qt.html#LayoutDirection-enum)
[如果块没有明确的方向设置，它会从块内容解决的方向。要么返回](qt.html#LayoutDirection-enum)[Qt.LeftToRight](qt.html#LayoutDirection-enum) or [Qt.RightToLeft](qt.html#LayoutDirection-enum)。
此功能被引入Qt的4.7 。
**See also** [QTextFormat.layoutDirection](qtextformat.html#layoutDirection)（ ）[QString.isRightToLeft](qstring.html#isRightToLeft)（）和[Qt.LayoutDirection](qt.html#LayoutDirection-enum)。
```
QTextList QTextBlock.textList (self)
```
[
如果块代表一个列表项，则返回该项目所属的列表，否则返回0 。
](qtextlist.html)
```
QTextBlockUserData QTextBlock.userData (self)
```
[](qtextblockuserdata.html)
[返回一个指针，指向一个](qtextblockuserdata.html)[QTextBlockUserData](qtextblockuserdata.html)如果以前设置与对象[setUserData](qtextblock.html#setUserData)（ ）或一个空指针。
这个函数是Qt 4.1中引入。
**See also** [setUserData](qtextblock.html#setUserData)（ ） 。
```
int QTextBlock.userState (self)
```
返回以前设置的整数值[setUserState](qtextblock.html#setUserState)（）或-1。
这个函数是Qt 4.1中引入。
**See also** [setUserState](qtextblock.html#setUserState)（ ） 。
```
bool QTextBlock.__eq__ (self, QTextBlock o)
```
```
bool QTextBlock.__ge__ (self, QTextBlock o)
```
```
bool QTextBlock.__lt__ (self, QTextBlock o)
```
```
bool QTextBlock.__ne__ (self, QTextBlock o)
```
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- QPinchGesture Class Reference
- QPixmap Class Reference
- QPixmapCache Class Reference
- QPlainTextDocumentLayout Class Reference
- QPlainTextEdit Class Reference
- QPluginLoader Class Reference
- QPoint Class Reference
- QPointF Class Reference
- QPolygon Class Reference
- QPolygonF Class Reference
- QPrintDialog Class Reference
- QPrintEngine Class Reference
- QPrinter Class Reference
- QPrinterInfo Class Reference
- QPrintPreviewDialog Class Reference
- QPrintPreviewWidget Class Reference
- QProcess Class Reference
- QProcessEnvironment Class Reference
- QProgressBar Class Reference
- QProgressDialog Class Reference
- QPropertyAnimation Class Reference
- QProxyModel Class Reference
- QPushButton Class Reference
- QPyDeclarativePropertyValueSource Class Reference
- QPyDesignerContainerExtension Class Reference
- QPyDesignerCustomWidgetCollectionPlugin Class Reference
- QPyDesignerCustomWidgetPlugin Class Reference
- QPyDesignerMemberSheetExtension Class Reference
- QPyDesignerPropertySheetExtension Class Reference
- QPyDesignerTaskMenuExtension Class Reference
- QPyNullVariant Class Reference
- QPyTextObject Class Reference
- QQuaternion Class Reference
- QRadialGradient Class Reference
- QRadioButton Class Reference
- QRawFont Class Reference
- QReadLocker Class Reference
- QReadWriteLock Class Reference
- QRect Class Reference
- QRectF Class Reference
- QRegExp Class Reference
- QRegExpValidator Class Reference
- QRegion Class Reference
- QResizeEvent Class Reference
- QResource Class Reference
- QRubberBand Class Reference
- QRunnable Class Reference
- QScriptClass Class Reference
- QScriptClassPropertyIterator Class Reference
- QScriptContext Class Reference
- QScriptContextInfo Class Reference
- QScriptEngine Class Reference
- QScriptEngineAgent Class Reference
- 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