# QTextLine Class Reference
## [[QtGui](index.htm) module]
在QTextLine类表示一个文本行内[QTextLayout](qtextlayout.html)。[More...](#details)
### Types
* `enum CursorPosition { CursorBetweenCharacters, CursorOnCharacter }`
* `enum Edge { Leading, Trailing }`
### Methods
* `__init__ (self)`
* `__init__ (self, QTextLine)`
* `float ascent (self)`
* `(float, int cursorPos) cursorToX (self, int cursorPos, Edge edge = QTextLine.Leading)`
* `float descent (self)`
* `draw (self, QPainter painter, QPointF position, QTextLayout.FormatRange selection = None)`
* `float height (self)`
* `float horizontalAdvance (self)`
* `bool isValid (self)`
* `float leading (self)`
* `bool leadingIncluded (self)`
* `int lineNumber (self)`
* `QRectF naturalTextRect (self)`
* `float naturalTextWidth (self)`
* `QPointF position (self)`
* `QRectF rect (self)`
* `setLeadingIncluded (self, bool included)`
* `setLineWidth (self, float width)`
* `setNumColumns (self, int columns)`
* `setNumColumns (self, int columns, float alignmentWidth)`
* `setPosition (self, QPointF pos)`
* `int textLength (self)`
* `int textStart (self)`
* `float width (self)`
* `float x (self)`
* `int xToCursor (self, float x, CursorPosition edge = QTextLine.CursorBetweenCharacters)`
* `float y (self)`
* * *
## Detailed Description
在QTextLine类表示一个文本行内[QTextLayout](qtextlayout.html)。
一个文本行通常是由创建[QTextLayout.createLine](qtextlayout.html#createLine)( ) 。
创建后,该行可使用的填充[setLineWidth](qtextline.html#setLineWidth)()或[setNumColumns](qtextline.html#setNumColumns)()函数。 A线都有一些属性,包括其佔用的矩形,[rect](qtextline.html#rect)() ,其坐标,[x](qtextline.html#x)()和[y](qtextline.html#y)() ,其[textLength](qtextline.html#textLength)( )[width](qtextline.html#width)()和[naturalTextWidth](qtextline.html#naturalTextWidth)() ,和其[ascent](qtextline.html#ascent)( )和体面()相对于文本。光标在该行的条款的位置是可从[cursorToX](qtextline.html#cursorToX)()和从它的逆[xToCursor](qtextline.html#xToCursor)( ) 。 A线可以与移动[setPosition](qtextline.html#setPosition)( ) 。
* * *
## Type Documentation
```
QTextLine.CursorPosition
```
| Constant | Value |
| --- | --- |
| `QTextLine.CursorBetweenCharacters` | `0` |
| `QTextLine.CursorOnCharacter` | `1` |
```
QTextLine.Edge
```
| Constant | Value |
| --- | --- |
| `QTextLine.Leading` | `0` |
| `QTextLine.Trailing` | `1` |
* * *
## Method Documentation
```
QTextLine.__init__ (self)
```
创建一个无效的行。
```
QTextLine.__init__ (self, QTextLine)
```
```
float QTextLine.ascent (self)
```
返回该行的崛起。
**See also** [descent](qtextline.html#descent)()和[height](qtextline.html#height)( ) 。
```
(float, int cursorPos) QTextLine.cursorToX (self, int cursorPos, Edge edge = QTextLine.Leading)
```
光标位置转换_cursorPos_到的对应的行内x位置,同时考虑_edge_。
If _cursorPos_是不是一个有效的光标位置,最接近的有效光标位置将被替代使用,并CPOS将被修改为指向这个有效的光标位置。
**See also** [xToCursor](qtextline.html#xToCursor)( ) 。
```
float QTextLine.descent (self)
```
返回该行的后裔。
**See also** [ascent](qtextline.html#ascent)()和[height](qtextline.html#height)( ) 。
```
QTextLine.draw (self, QPainter painter, QPointF position, QTextLayout.FormatRange selection = None)
```
绘制行中给定的_painter_在指定的_position_。该_selection_供内部使用保留的。
```
float QTextLine.height (self)
```
返回该行的高度。这等于[ascent](qtextline.html#ascent)()+[descent](qtextline.html#descent)( ) + 1 ,如果是不包括在内的领先。如果领导包括在内,这等于[ascent](qtextline.html#ascent)()+[descent](qtextline.html#descent)()+[leading](qtextline.html#leading)()+ 1 。
**See also** [ascent](qtextline.html#ascent)( )[descent](qtextline.html#descent)( )[leading](qtextline.html#leading)()和[setLeadingIncluded](qtextline.html#setLeadingIncluded)( ) 。
```
float QTextLine.horizontalAdvance (self)
```
返回文本的水平前进。文本的进步是从它的位置到下一个位置,在该文本自然会得出的距离。
通过将前进到文本行的位置,并使用这个作为第二文本行的位置,你就可以无需在两者之间的间隙来定位两行并排侧。
此功能被引入Qt的4.7 。
```
bool QTextLine.isValid (self)
```
返回True如果该文本行是有效的,否则返回False 。
```
float QTextLine.leading (self)
```
返回该行的领导。
此功能被引入Qt的4.6 。
**See also** [ascent](qtextline.html#ascent)( )[descent](qtextline.html#descent)()和[height](qtextline.html#height)( ) 。
```
bool QTextLine.leadingIncluded (self)
```
返回True如果积极主导,计入该行的高度,否则返回False 。
默认情况下,是不包括在内的领先。
此功能被引入Qt的4.6 。
**See also** [setLeadingIncluded](qtextline.html#setLeadingIncluded)( ) 。
```
int QTextLine.lineNumber (self)
```
返回文本引擎的线的位置。
```
QRectF QTextLine.naturalTextRect (self)
```
[
返回复盖的线的矩形。
```
float QTextLine.naturalTextWidth (self)
```
](qrectf.html)
[返回由文本所佔据的线的宽度。这始终是\u003c =到](qrectf.html)[width](qtextline.html#width)( ) ,并且是可以在不改变换行位置使用的布局( )的最小宽度。
```
QPointF QTextLine.position (self)
```
[
返回该行的位置相对于文本布局的地位。
](qpointf.html)
[**See also**](qpointf.html) [setPosition](qtextline.html#setPosition)( ) 。
```
QRectF QTextLine.rect (self)
```
[
返回该行的边界矩形。
](qrectf.html)
[**See also**](qrectf.html) [x](qtextline.html#x)( )[y](qtextline.html#y)( )[textLength](qtextline.html#textLength)()和[width](qtextline.html#width)( ) 。
```
QTextLine.setLeadingIncluded (self, bool included)
```
包括积极主导入行的高度,如果_included_为True,否则不包括领先。
默认情况下,是不包括在内的领先。
需要注意的是负领先被忽略,它必须在代码中使用的文本行通过让线重叠处理。
此功能被引入Qt的4.6 。
**See also** [leadingIncluded](qtextline.html#leadingIncluded)( ) 。
```
QTextLine.setLineWidth (self, float width)
```
勾画出具有给定的线_width_。该生产线是从起始位置充满了尽可能多的字符将适合入行。在壳体的文本不能被分割在该行的末尾,将被填充有附加字符到下一个空白字符或文本的末尾。
```
QTextLine.setNumColumns (self, int columns)
```
勾画出的线条。该生产线是从它的起始位置充满了尽可能多的字符被指定_numColumns_。若文本不能被分割,直到_numColumns_字符,该行就会充满尽可能多的字符到下一个空格或文字的结尾。
```
QTextLine.setNumColumns (self, int columns, float alignmentWidth)
```
勾画出的线条。该生产线是从它的起始位置充满了尽可能多的字符被指定_numColumns_。若文本不能被分割,直到_numColumns_字符,该行就会充满尽可能多的字符到下一个空格或文字的结尾。提供_alignmentWidth_被用作基准宽度对齐。
```
QTextLine.setPosition (self, QPointF pos)
```
移动线位置_pos_。
**See also** [position](qtextline.html#position)( ) 。
```
int QTextLine.textLength (self)
```
返回该行的文本的长度。
**See also** [naturalTextWidth](qtextline.html#naturalTextWidth)( ) 。
```
int QTextLine.textStart (self)
```
返回该行的开始从传递到该字符串的开头[QTextLayout](qtextlayout.html)。
```
float QTextLine.width (self)
```
返回所指定的布局( )函数线的宽度。
**See also** [naturalTextWidth](qtextline.html#naturalTextWidth)( )[x](qtextline.html#x)( )[y](qtextline.html#y)( )[textLength](qtextline.html#textLength)()和[rect](qtextline.html#rect)( ) 。
```
float QTextLine.x (self)
```
返回该行的x位置。
**See also** [rect](qtextline.html#rect)( )[y](qtextline.html#y)( )[textLength](qtextline.html#textLength)()和[width](qtextline.html#width)( ) 。
```
int QTextLine.xToCursor (self, float x, CursorPosition edge = QTextLine.CursorBetweenCharacters)
```
转换的x坐标_x_到最近匹配的光标位置,根据光标位置类型,_cpos_。
**See also** [cursorToX](qtextline.html#cursorToX)( ) 。
```
float QTextLine.y (self)
```
返回该行的y位置。
**See also** [x](qtextline.html#x)( )[rect](qtextline.html#rect)( )[textLength](qtextline.html#textLength)()和[width](qtextline.html#width)( ) 。
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- 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