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# QTextLine Class Reference
[QtGui module]

The QTextLine class represents a line of text inside a QTextLayout. More...

     #include <QTextLine>

Note: All the functions in this class are reentrant.

- List of all members, including inherited members

### Public Types

- enum CursorPosition { CursorBetweenCharacters, CursorOnCharacter }
- enum Edge { Leading, Trailing }

### Public Functions

- QTextLine ()
- qreal ascent () const
- qreal cursorToX ( int * cursorPos, Edge edge = Leading ) const
- qreal cursorToX ( int cursorPos, Edge edge = Leading ) const
- qreal descent () const
- void draw ( QPainter * painter, const QPointF & position, const QTextLayout::FormatRange * selection = 0 ) const
- qreal height () const
- bool isValid () const
- int lineNumber () const
- QRectF naturalTextRect () const
- qreal naturalTextWidth () const
- QPointF position () const
- QRectF rect () const
- void setLineWidth ( qreal width )
- void setNumColumns ( int numColumns )
- void setNumColumns ( int numColumns, qreal alignmentWidth )
- void setPosition ( const QPointF & pos )
- int textLength () const
- int textStart () const
- qreal width () const
- qreal x () const
- int xToCursor ( qreal x, CursorPosition cpos = CursorBetweenCharacters ) const
- qreal y () const

## Detailed Description

The QTextLine class represents a line of text inside a QTextLayout.

A text line is usually created by QTextLayout::createLine().

After being created, the line can be filled using the setLineWidth() or setNumColumns() functions. A line has a number of attributes including the rectangle it occupies, rect(), its coordinates, x() and y(), its textLength(), width() and naturalTextWidth(), and its ascent() and decent() relative to the text. The position of the cursor in terms of the line is available from cursorToX() and its inverse from xToCursor(). A line can be moved with setPosition().

## Member Type Documentation

### enum QTextLine::CursorPosition

Constant | Value
--- | ---
`QTextLine::CursorBetweenCharacters` | `0`
`QTextLine::CursorOnCharacter` | `1`

### enum QTextLine::Edge

Constant | Value
--- | ---
`QTextLine::Leading` | `0`
`QTextLine::Trailing` | `1`

## Member Function Documentation

### QTextLine::QTextLine ()

Creates an invalid line.

### qreal QTextLine::ascent () const

Returns the line's ascent.

See also descent() and height().

### qreal QTextLine::cursorToX ( int * cursorPos, Edge edge = Leading ) const

Converts the cursor position cursorPos to the corresponding x position inside the line, taking account of the edge.

If cursorPos is not a valid cursor position, the nearest valid cursor position will be used instead, and cpos will be modified to point to this valid cursor position.

See also xToCursor().

### qreal QTextLine::cursorToX ( int cursorPos, Edge edge = Leading ) const

This is an overloaded member function, provided for convenience.

### qreal QTextLine::descent () const

Returns the line's descent.

See also ascent() and height().

### void QTextLine::draw ( QPainter * painter, const QPointF & position, const QTextLayout::FormatRange * selection = 0 ) const

Draws a line on the given painter at the specified position. The selection is reserved for internal use.

### qreal QTextLine::height () const

Returns the line's height. This is equal to ascent() + descent() + 1.

See also ascent() and descent().

### bool QTextLine::isValid () const

Returns true if this text line is valid; otherwise returns false.

### int QTextLine::lineNumber () const

Returns the position of the line in the text engine.

### QRectF QTextLine::naturalTextRect () const

Returns the rectangle covered by the line.

### qreal QTextLine::naturalTextWidth () const

Returns the width of the line that is occupied by text. This is always <= to width(), and is the minimum width that could be used by layout() without changing the line break position.

### QPointF QTextLine::position () const

Returns the line's position relative to the text layout's position.

See also setPosition().

### QRectF QTextLine::rect () const

Returns the line's bounding rectangle.

See also x(), y(), textLength(), and width().

### void QTextLine::setLineWidth ( qreal width )

Lays out the line with the given width. The line is filled from its starting position with as many characters as will fit into the line. In case the text cannot be split at the end of the line, it will be filled with additional characters to the next whitespace or end of the text.

### void QTextLine::setNumColumns ( int numColumns )

Lays out the line. The line is filled from its starting position with as many characters as are specified by numColumns. In case the text cannot be split until numColumns characters, the line will be filled with as many characters to the next whitespace or end of the text.

### void QTextLine::setNumColumns ( int numColumns, qreal alignmentWidth )

This is an overloaded member function, provided for convenience.

Lays out the line. The line is filled from its starting position with as many characters as are specified by numColumns. In case the text cannot be split until numColumns characters, the line will be filled with as many characters to the next whitespace or end of the text. The provided alignmentWidth is used as reference width for alignment.

### void QTextLine::setPosition ( const QPointF & pos )

Moves the line to position pos.

See also position().

### int QTextLine::textLength () const

Returns the length of the text in the line.

See also naturalTextWidth().

### int QTextLine::textStart () const

Returns the start of the line from the beginning of the string passed to the QTextLayout.

### qreal QTextLine::width () const

Returns the line's width as specified by the layout() function.

See also naturalTextWidth(), x(), y(), textLength(), and rect().

### qreal QTextLine::x () const

Returns the line's x position.

See also rect(), y(), textLength(), and width().

### int QTextLine::xToCursor ( qreal x, CursorPosition cpos = CursorBetweenCharacters ) const

Converts the x-coordinate x, to the nearest matching cursor position, depending on the cursor position type, cpos.

See also cursorToX().

### qreal QTextLine::y () const

Returns the line's y position.

See also x(), rect(), textLength(), and width().