QSize Class

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

Header: #include <QSize>
qmake: QT += core

Public Functions

QSize()
QSize(int w, int h)
QSize boundedTo(const QSize &) const
QSize expandedTo(const QSize &) const
int height() const
bool isEmpty() const
bool isNull() const
bool isValid() const
int &rheight()
int &rwidth()
void scale(int w, int h, Qt::AspectRatioMode mode)
void scale(const QSize &s, Qt::AspectRatioMode mode)
QSize scaled(int w, int h, Qt::AspectRatioMode mode) const
QSize scaled(const QSize &s, Qt::AspectRatioMode mode) const
void setHeight(int h)
void setWidth(int w)
CGSize toCGSize() const
void transpose()
QSize transposed() const
int width() const
QSize &operator*=(qreal c)
QSize &operator+=(const QSize &)
QSize &operator-=(const QSize &)
QSize &operator/=(qreal c)
bool operator!=(const QSize &s1, const QSize &s2)
const QSize operator*(const QSize &size, qreal factor)
const QSize operator*(qreal factor, const QSize &size)
const QSize operator+(const QSize &s1, const QSize &s2)
const QSize operator-(const QSize &s1, const QSize &s2)
const QSize operator/(const QSize &size, qreal divisor)
QDataStream &operator<<(QDataStream &stream, const QSize &size)
bool operator==(const QSize &s1, const QSize &s2)
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 or equal to 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, and QRect.

Member Function Documentation

QSize::QSize()

Default constructs an instance of QSize.

QSize::QSize(int w, int h)

Default constructs an instance of QSize.

QSize QSize::boundedTo(const QSize &) const

QSize QSize::expandedTo(const QSize &) const

int QSize::height() const

See also setHeight().

bool QSize::isEmpty() const

bool QSize::isNull() const

bool QSize::isValid() const

int &QSize::rheight()

int &QSize::rwidth()

void QSize::scale(int w, int h, Qt::AspectRatioMode mode)

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

QSize QSize::scaled(int w, int h, Qt::AspectRatioMode mode) const

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

This is an overloaded function.

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

This function was introduced in Qt 5.0.

void QSize::setHeight(int h)

See also height().

void QSize::setWidth(int w)

See also width().

CGSize QSize::toCGSize() const

Creates a CGSize from a QSize.

This function was introduced in Qt 5.8.

See also QSizeF::fromCGSize().

void QSize::transpose()

Swaps the width and height values.

See also setWidth(), setHeight(), and transposed().

QSize QSize::transposed() const

int QSize::width() const

See also setWidth().

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

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

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

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

Related Non-Members

bool operator!=(const QSize &s1, const QSize &s2)

Returns true if s1 and s2 are different; otherwise returns false.

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

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)

This is an overloaded function.

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

const QSize operator+(const QSize &s1, const QSize &s2)

Returns the sum of s1 and s2; each component is added separately.

const QSize operator-(const QSize &s1, const QSize &s2)

Returns s2 subtracted from s1; each component is subtracted separately.

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

This is an overloaded function.

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

See also QSize::scale().

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

Writes the given size to the given stream, and returns a reference to the stream.

See also Serializing Qt Data Types.

bool operator==(const QSize &s1, const QSize &s2)

Returns true if s1 and s2 are equal; otherwise returns false.

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

Reads a size from the given stream into the given size, and returns a reference to the stream.

See also Serializing Qt Data Types.