he QSize class defines the size of a two-dimensional object using integer point precision. More...

Public Methods
constexpr	QSize ()

constexpr	QSize (int width, int height)

QSize	boundedTo (const QSize &other) const

QSize	expandedTo (const QSize &other) const

constexpr int	height () const

constexpr bool	isEmpty () const

constexpr bool	isNull () const

constexpr bool	isValid () const

QSize &	operator*= (qreal factor)

QSize &	operator+= (const QSize &size)

QSize &	operator-= (const QSize &size)

QSize &	operator/= (qreal factor)

int &	rheight ()

int &	rwidth ()

void	scale (const QSize &size, Qt::AspectRatioMode mode)

void	scale (int width, int height, Qt::AspectRatioMode mode)

QSize	scaled (const QSize &size, Qt::AspectRatioMode mode) const

QSize	scaled (int width, int height, Qt::AspectRatioMode mode) const

void	setHeight (int height)

void	setWidth (int width)

void	transpose ()

QSize	transposed () const

constexpr int	width () const

Friends
bool	operator!= (const QSize &size1, const QSize &size2)

const QSize	operator* (const QSize &size, qreal factor)

const QSize	operator* (qreal factor, const QSize &size)

const QSize	operator+ (const QSize &size1, const QSize &size2)

const QSize	operator- (const QSize &size1, const QSize &size2)

const QSize	operator/ (const QSize &size, qreal factor)

bool	operator== (const QSize &size1, const QSize &size2)

Related Functions
These are not member functions
QDataStream &	operator<< (QDataStream &stream, const QSize &size)

QDataStream &	operator>> (QDataStream &stream, QSize &size)

Detailed Description

The QSize class defines the size of a two-dimensional object using integer point precision.

A size is specified by a width() and a height(). It can be set in the constructor and changed using the setWidth(), setHeight(), or scale() functions, or using arithmetic operators. A size can also be manipulated directly by retrieving references to the width and height using the rwidth() and rheight() functions. Finally, the width and height can be swapped using the transpose() function.

The isValid() function determines if a size is valid (a valid size has both width and height greater than zero). The isEmpty() function returns true if either of the width and height is less than, or equal to, zero, while the isNull() function returns true only if both the width and the height is zero.

Use the expandedTo() function to retrieve a size which holds the maximum height and width of this size and a given size. Similarly, the boundedTo() function returns a size which holds the minimum height and width of this size and a given size.

QSize objects can be streamed as well as compared.

See also: QSizeF, QPoint, QRect

Constructor & Destructor Documentation

constexpr QSize::QSize ( )

inlineconstexpr

Constructs a size with an invalid width and height (i.e., isValid() returns false).

See also: isValid()

constexpr QSize::QSize	(	int	width,
		int	height
	)

inlineconstexpr

Constructs a size with the given width and height.

See also: setWidth(), setHeight()

Method Documentation

QSize QSize::boundedTo ( const QSize & other ) const

inline

Returns a size holding the minimum width and height of this size and the given other.

See also: expandedTo(), scale()

QSize QSize::expandedTo ( const QSize & other ) const

inline

Returns a size holding the maximum width and height of this size and the given other.

See also: boundedTo(), scale()

constexpr int QSize::height ( ) const

inlineconstexpr

Returns the height.

See also: width(), setHeight()

constexpr bool QSize::isEmpty ( ) const

inlineconstexpr

Returns true if either of the width and height is less than or equal to 0, otherwise returns false.

See also: isNull(), isValid()

constexpr bool QSize::isNull ( ) const

inlineconstexpr

Returns true if both the width and height is 0, otherwise returns false.

See also: isValid(), isEmpty()

constexpr bool QSize::isValid ( ) const

inlineconstexpr

Returns true if both the width and height is equal to or greater than 0, otherwise returns false.

See also: isNull(), isEmpty()

QSize & QSize::operator*= ( qreal factor )

inline

Multiplies both the width and height by the given factor and returns a reference to the size. The result is rounded to the nearest integer.

See also: scale()

QSize & QSize::operator+= ( const QSize & size )

inline

Adds the given size to the current QSize and returns a reference to this size.

QSize s( 3, 7);
QSize r(-1, 4);
s += r;
 
// s becomes (2,11)

QSize & QSize::operator-= ( const QSize & size )

inline

Subtracts the given size from the current QSize and returns a reference to this size.

QSize s( 3, 7);
QSize r(-1, 4);
s -= r;
 
// s becomes (4,3)

QSize & QSize::operator/= ( qreal factor )

inline

Divides both the width and height by the given factor and returns a reference to the size. The result is rounded to the nearest integer.

See also: QSize::scale()

int & QSize::rheight ( )

inline

Returns a reference to the height. Using a reference makes it possible to manipulate the height directly.

QSize size(100, 10);
size.rheight() += 5;
 
// size becomes (100,15)

See also: rwidth(), setHeight()

int & QSize::rwidth ( )

inline

Returns a reference to the width. Using a reference makes it possible to manipulate the width directly.

QSize size(100, 10);
size.rwidth() += 20;
 
// size becomes (120,10)

See also: rheight(), setWidth()

void QSize::scale	(	const QSize &	size,
		Qt::AspectRatioMode	mode
	)

inline

Scales the size to a rectangle with the given size, according to the specified mode.

void QSize::scale	(	int	width,
		int	height,
		Qt::AspectRatioMode	mode
	)

inline

Scales the size to a rectangle with the given width and height according to the specified mode.

If mode is Qt::IgnoreAspectRatio, the size is set to (width, height).
If mode is Qt::KeepAspectRatio, the current size is scaled to a rectangle as large as possible inside (width, height), preserving the aspect ratio.
If mode is Qt::KeepAspectRatioByExpanding, the current size is scaled to a rectangle as small as possible outside (width, height), preserving the aspect ratio.

QSize t1(10, 12);
t1.scale(60, 60, Qt::IgnoreAspectRatio);
// t1 is (60, 60)
 
QSize t2(10, 12);
t2.scale(60, 60, Qt::KeepAspectRatio);
// t2 is (50, 60)
 
QSize t3(10, 12);
t3.scale(60, 60, Qt::KeepAspectRatioByExpanding);
// t3 is (60, 72)

See also: setWidth(), setHeight()

QSize QSize::scaled	(	const QSize &	size,
		Qt::AspectRatioMode	mode
	)		const

Return a size scaled to a rectangle with the given size, according to the specified mode.

QSize QSize::scaled	(	int	width,
		int	height,
		Qt::AspectRatioMode	mode
	)		const

inline

Return a size scaled to a rectangle with the given width and height, according to the specified mode.

void QSize::setHeight ( int height )

inline

Sets the height to the given height.

See also: rheight(), height(), setWidth()

void QSize::setWidth ( int width )

inline

Sets the width to the given width.

See also: rwidth(), width(), setHeight()

void QSize::transpose ( )

Swaps the width and height values.

See also: setWidth(), setHeight(), transposed()

QSize QSize::transposed ( ) const

inline

Returns a QSize with width and height swapped.

See also: transpose()

constexpr int QSize::width ( ) const

inlineconstexpr

Returns the width.

See also: height(), setWidth()

Friends And Related Function Documentation

bool operator!=	(	const QSize &	size1,
		const QSize &	size2
	)

friend

Returns true if size1 and size2 are different, otherwise returns false.

const QSize operator*	(	const QSize &	size,
		qreal	factor
	)

friend

Multiplies the given size by the given factor and returns the result rounded to the nearest integer.

See also: QSize::scale()

const QSize operator*	(	qreal	factor,
		const QSize &	size
	)

friend

Multiplies the given size by the given factor and returns the result rounded to the nearest integer.

const QSize operator+	(	const QSize &	size1,
		const QSize &	size2
	)

friend

Returns the sum of size1 and size2. Each component is added separately.

const QSize operator-	(	const QSize &	size1,
		const QSize &	size2
	)

friend

Returns size2 subtracted from size1. Each component is subtracted separately.

const QSize operator/	(	const QSize &	size,
		qreal	factor
	)

friend

Divides the given size by the given factor and returns the result rounded to the nearest integer.

See also: QSize::scale()

QDataStream & operator<<	(	QDataStream &	stream,
		const QSize &	size
	)

Refer to Serializing Data Types for additional information.

bool operator==	(	const QSize &	size1,
		const QSize &	size2
	)

friend

Returns true if size1 and size2 are equal, otherwise returns false.

QDataStream & operator>>	(	QDataStream &	stream,
		QSize &	size
	)

Refer to Serializing Data Types for additional information.

Public Methods

Friends

Related Functions

Detailed Description

Constructor & Destructor Documentation

Method Documentation

Friends And Related Function Documentation