# QPlainTextDocumentLayout Class Reference
## [[QtGui](index.htm) module]
该QPlainTextDocumentLayout类实现一个纯文本布局[QTextDocument](qtextdocument.html) [More...](#details)
继承[QAbstractTextDocumentLayout](qabstracttextdocumentlayout.html)。
### Methods
* `__init__ (self, QTextDocument document)`
* `QRectF blockBoundingRect (self, QTextBlock block)`
* `int cursorWidth (self)`
* `documentChanged (self, int from, int, int charsAdded)`
* `QSizeF documentSize (self)`
* `draw (self, QPainter, QAbstractTextDocumentLayout.PaintContext)`
* `ensureBlockLayout (self, QTextBlock block)`
* `QRectF frameBoundingRect (self, QTextFrame)`
* `int hitTest (self, QPointF, Qt.HitTestAccuracy)`
* `int pageCount (self)`
* `requestUpdate (self)`
* `setCursorWidth (self, int width)`
* * *
## Detailed Description
该QPlainTextDocumentLayout类实现一个纯文本布局[QTextDocument](qtextdocument.html)
一个QPlainTextDocumentLayout是必需的文本文档，可显示或编辑的[QPlainTextEdit](qplaintextedit.html)。看[QTextDocument.setDocumentLayout](qtextdocument.html#setDocumentLayout)（ ） 。
QPlainTextDocumentLayout使用[QAbstractTextDocumentLayout](qabstracttextdocumentlayout.html)的API，[QTextDocument](qtextdocument.html)需要，但部分重新定义它，以更好地支持纯文本。为实例，并不对垂直像素进行操作，但在第（称为块）来代替。文档的高度是相同的它包含段落的数目。布局上也并不支持表或嵌套的框架，或者说超出了语法高亮段落的列表，任何形式的先进的文本布局。
* * *
## Method Documentation
```
QPlainTextDocumentLayout.__init__ (self, QTextDocument document)
```
构造一个纯文本文档布局的文本_document_。
```
QRectF QPlainTextDocumentLayout.blockBoundingRect (self, QTextBlock block)
```
[](qrectf.html)
[从重新实现](qrectf.html)[QAbstractTextDocumentLayout.blockBoundingRect](qabstracttextdocumentlayout.html#blockBoundingRect)（ ） 。
```
int QPlainTextDocumentLayout.cursorWidth (self)
```
```
QPlainTextDocumentLayout.documentChanged (self, int from, int, int charsAdded)
```
从重新实现[QAbstractTextDocumentLayout.documentChanged](qabstracttextdocumentlayout.html#documentChanged)（ ） 。
```
QSizeF QPlainTextDocumentLayout.documentSize (self)
```
[](qsizef.html)
[从重新实现](qsizef.html)[QAbstractTextDocumentLayout.documentSize](qabstracttextdocumentlayout.html#documentSize)（ ） 。
```
QPlainTextDocumentLayout.draw (self, QPainter, QAbstractTextDocumentLayout.PaintContext)
```
从重新实现[QAbstractTextDocumentLayout.draw](qabstracttextdocumentlayout.html#draw)（ ） 。
```
QPlainTextDocumentLayout.ensureBlockLayout (self, QTextBlock block)
```
确保_block_具有有效的布局
```
QRectF QPlainTextDocumentLayout.frameBoundingRect (self, QTextFrame)
```
[](qrectf.html)
[从重新实现](qrectf.html)[QAbstractTextDocumentLayout.frameBoundingRect](qabstracttextdocumentlayout.html#frameBoundingRect)（ ） 。
```
int QPlainTextDocumentLayout.hitTest (self, QPointF, Qt.HitTestAccuracy)
```
从重新实现[QAbstractTextDocumentLayout.hitTest](qabstracttextdocumentlayout.html#hitTest)（ ） 。
```
int QPlainTextDocumentLayout.pageCount (self)
```
从重新实现[QAbstractTextDocumentLayout.pageCount](qabstracttextdocumentlayout.html#pageCount)（ ） 。
```
QPlainTextDocumentLayout.requestUpdate (self)
```
请在所有视图一个完整的更新。
```
QPlainTextDocumentLayout.setCursorWidth (self, int width)
```
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