QPlainTextDocumentLayout Class | Qt Widgets | Qt 6.12.0
Description: The QPlainTextDocumentLayout class implements a plain text layout for QTextDocument.
Keywords: class

- Qt 6.12
- Qt Widgets
- C++ Classes
- QPlainTextDocumentLayout
- Qt 6.12.0 Reference Documentation

# QPlainTextDocumentLayout Class

The QPlainTextDocumentLayout class implements a plain text layout for QTextDocument. More...

Header: | `#include <QPlainTextDocumentLayout>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Widgets)` `target_link_libraries(mytarget PRIVATE Qt6::Widgets)`
qmake: | `QT += widgets`
Inherits: | QAbstractTextDocumentLayout

- List of all members, including inherited members
- QPlainTextDocumentLayout is part of Rich Text Processing APIs.

## Properties

- cursorWidth : int

## Public Functions

| QPlainTextDocumentLayout(QTextDocument *document)
virtual | ~QPlainTextDocumentLayout()
int | cursorWidth() const
void | ensureBlockLayout(const QTextBlock &block) const
void | requestUpdate()
void | setCursorWidth(int width)

## Reimplemented Public Functions

virtual QRectF | blockBoundingRect(const QTextBlock &block) const override
virtual QSizeF | documentSize() const override
virtual void | draw(QPainter *, const QAbstractTextDocumentLayout::PaintContext &) override
virtual QRectF | frameBoundingRect(QTextFrame *) const override
virtual int | hitTest(const QPointF &, Qt::HitTestAccuracy) const override
virtual int | pageCount() const override

## Reimplemented Protected Functions

virtual void | documentChanged(int from, int charsRemoved, int charsAdded) override

## Detailed Description

A QPlainTextDocumentLayout is required for text documents that can be display or edited in a QPlainTextEdit. See QTextDocument::setDocumentLayout().

QPlainTextDocumentLayout uses the QAbstractTextDocumentLayout API that QTextDocument requires, but redefines it partially in order to support plain text better. For instances, it does not operate on vertical pixels, but on paragraphs (called blocks) instead. The height of a document is identical to the number of paragraphs it contains. The layout also doesn't support tables or nested frames, or any sort of advanced text layout that goes beyond a list of paragraphs with syntax highlighting.

## Property Documentation

### cursorWidth : int

This property specifies the width of the cursor in pixels. The default value is 1.

Access functions:

int | cursorWidth() const
void | setCursorWidth(int width)

## Member Function Documentation

### QPlainTextDocumentLayout::QPlainTextDocumentLayout(QTextDocument *document)

Constructs a plain text document layout for the text document.

### `[virtual noexcept]` QPlainTextDocumentLayout::~QPlainTextDocumentLayout()

Destructs a plain text document layout.

### `[override virtual]` QRectF QPlainTextDocumentLayout::blockBoundingRect(const QTextBlock &block) const

Reimplements: QAbstractTextDocumentLayout::blockBoundingRect(const QTextBlock &block) const.

### `[override virtual protected]` void QPlainTextDocumentLayout::documentChanged(int from, int charsRemoved, int charsAdded)

Reimplements: QAbstractTextDocumentLayout::documentChanged(int position, int charsRemoved, int charsAdded).

### `[override virtual]` QSizeF QPlainTextDocumentLayout::documentSize() const

Reimplements: QAbstractTextDocumentLayout::documentSize() const.

### `[override virtual]` void QPlainTextDocumentLayout::draw(QPainter *, const QAbstractTextDocumentLayout::PaintContext &)

Reimplements: QAbstractTextDocumentLayout::draw(QPainter *painter, const QAbstractTextDocumentLayout::PaintContext &context).

### void QPlainTextDocumentLayout::ensureBlockLayout(const QTextBlock &block) const

Ensures that block has a valid layout

### `[override virtual]` QRectF QPlainTextDocumentLayout::frameBoundingRect(QTextFrame *) const

Reimplements: QAbstractTextDocumentLayout::frameBoundingRect(QTextFrame *frame) const.

### `[override virtual]` int QPlainTextDocumentLayout::hitTest(const QPointF &, Qt::HitTestAccuracy) const

Reimplements: QAbstractTextDocumentLayout::hitTest(const QPointF &point, Qt::HitTestAccuracy accuracy) const.

### `[override virtual]` int QPlainTextDocumentLayout::pageCount() const

Reimplements: QAbstractTextDocumentLayout::pageCount() const.

### void QPlainTextDocumentLayout::requestUpdate()

Requests a complete update on all views.