# QMargins Class

The QMargins class defines the four margins of a rectangle. More...

Header: | #include <QMargins> |

CMake: | find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core) |

qmake: | QT += core |

- List of all members, including inherited members
- QMargins is part of Painting Classes.

## Public Functions

QMargins() | |

QMargins(int left, int top, int right, int bottom) | |

int | bottom() const |

bool | isNull() const |

int | left() const |

int | right() const |

void | setBottom(int bottom) |

void | setLeft(int left) |

void | setRight(int right) |

void | setTop(int Top) |

`(since 6.4)` QMarginsF | toMarginsF() const |

int | top() const |

QMargins & | operator*=(int factor) |

QMargins & | operator*=(qreal factor) |

QMargins & | operator+=(const QMargins &margins) |

QMargins & | operator+=(int addend) |

QMargins & | operator-=(const QMargins &margins) |

QMargins & | operator-=(int subtrahend) |

QMargins & | operator/=(int divisor) |

QMargins & | operator/=(qreal divisor) |

## Related Non-Members

bool | operator!=(const QMargins &m1, const QMargins &m2) |

QMargins | operator*(const QMargins &margins, int factor) |

QMargins | operator*(int factor, const QMargins &margins) |

QMargins | operator*(const QMargins &margins, qreal factor) |

QMargins | operator*(qreal factor, const QMargins &margins) |

QMargins | operator+(const QMargins &m1, const QMargins &m2) |

QMargins | operator+(const QMargins &lhs, int rhs) |

QMargins | operator+(int lhs, const QMargins &rhs) |

QMargins | operator+(const QMargins &margins) |

QMargins | operator-(const QMargins &m1, const QMargins &m2) |

QMargins | operator-(const QMargins &lhs, int rhs) |

QMargins | operator-(const QMargins &margins) |

QMargins | operator/(const QMargins &margins, int divisor) |

QMargins | operator/(const QMargins &margins, qreal divisor) |

QDataStream & | operator<<(QDataStream &stream, const QMargins &m) |

bool | operator==(const QMargins &m1, const QMargins &m2) |

QDataStream & | operator>>(QDataStream &stream, QMargins &m) |

`(since 6.0)` QMargins | operator|(const QMargins &m1, const QMargins &m2) |

## Detailed Description

QMargin defines a set of four margins; left, top, right, and bottom, that describe the size of the borders surrounding a rectangle.

The isNull() function returns `true`

only if all margins are set to zero.

QMargin objects can be streamed as well as compared.

## Member Function Documentation

`[constexpr noexcept]`

QMargins::QMargins()

Constructs a margins object with all margins set to 0.

**See also **isNull().

`[constexpr noexcept]`

QMargins::QMargins(int *left*, int *top*, int *right*, int *bottom*)

Constructs margins with the given *left*, *top*, *right*, and *bottom*

**See also **setLeft(), setRight(), setTop(), and setBottom().

`[constexpr noexcept]`

int QMargins::bottom() const

Returns the bottom margin.

**See also **setBottom().

`[constexpr noexcept]`

bool QMargins::isNull() const

Returns `true`

if all margins are is 0; otherwise returns false.

`[constexpr noexcept]`

int QMargins::left() const

Returns the left margin.

**See also **setLeft().

`[constexpr noexcept]`

int QMargins::right() const

Returns the right margin.

**See also **setRight().

`[constexpr noexcept]`

void QMargins::setBottom(int *bottom*)

Sets the bottom margin to *bottom*.

**See also **bottom().

`[constexpr noexcept]`

void QMargins::setLeft(int *left*)

Sets the left margin to *left*.

**See also **left().

`[constexpr noexcept]`

void QMargins::setRight(int *right*)

Sets the right margin to *right*.

**See also **right().

`[constexpr noexcept]`

void QMargins::setTop(int *Top*)

Sets the Top margin to *Top*.

**See also **top().

`[constexpr noexcept, since 6.4]`

QMarginsF QMargins::toMarginsF() const

Returns these margins as margins with floating point accuracy.

This function was introduced in Qt 6.4.

**See also **QMarginsF::toMargins().

`[constexpr noexcept]`

int QMargins::top() const

Returns the top margin.

**See also **setTop().

`[constexpr noexcept]`

QMargins &QMargins::operator*=(int *factor*)

Multiplies each component of this object by *factor* and returns a reference to it.

**See also **operator/=().

`[constexpr noexcept]`

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

This is an overloaded function.

Multiplies each component of this object by *factor* and returns a reference to it.

**See also **operator/=().

`[constexpr noexcept]`

QMargins &QMargins::operator+=(const QMargins &*margins*)

Add each component of *margins* to the respective component of this object and returns a reference to it.

**See also **operator-=().

`[constexpr noexcept]`

QMargins &QMargins::operator+=(int *addend*)

This is an overloaded function.

Adds the *addend* to each component of this object and returns a reference to it.

**See also **operator-=().

`[constexpr noexcept]`

QMargins &QMargins::operator-=(const QMargins &*margins*)

Subtract each component of *margins* from the respective component of this object and returns a reference to it.

**See also **operator+=().

`[constexpr noexcept]`

QMargins &QMargins::operator-=(int *subtrahend*)

This is an overloaded function.

Subtracts the *subtrahend* from each component of this object and returns a reference to it.

**See also **operator+=().

`[constexpr]`

QMargins &QMargins::operator/=(int *divisor*)

Divides each component of this object by *divisor* and returns a reference to it.

**See also **operator*=().

`[constexpr]`

QMargins &QMargins::operator/=(qreal *divisor*)

This is an overloaded function.

**See also **operator*=().

## Related Non-Members

`[constexpr noexcept]`

bool operator!=(const QMargins &*m1*, const QMargins &*m2*)

Returns `true`

if *m1* and *m2* are different; otherwise returns `false`

.

`[constexpr noexcept]`

QMargins operator*(const QMargins &*margins*, int *factor*)

Returns a QMargins object that is formed by multiplying each component of the given *margins* by *factor*.

**See also **QMargins::operator*=() and QMargins::operator/=().

`[constexpr noexcept]`

QMargins operator*(int *factor*, const QMargins &*margins*)

This is an overloaded function.

Returns a QMargins object that is formed by multiplying each component of the given *margins* by *factor*.

**See also **QMargins::operator*=() and QMargins::operator/=().

`[constexpr noexcept]`

QMargins operator*(const QMargins &*margins*, qreal *factor*)

This is an overloaded function.

Returns a QMargins object that is formed by multiplying each component of the given *margins* by *factor*.

**See also **QMargins::operator*=() and QMargins::operator/=().

`[constexpr noexcept]`

QMargins operator*(qreal *factor*, const QMargins &*margins*)

This is an overloaded function.

*margins* by *factor*.

**See also **QMargins::operator*=() and QMargins::operator/=().

`[constexpr noexcept]`

QMargins operator+(const QMargins &*m1*, const QMargins &*m2*)

Returns a QMargins object that is the sum of the given margins, *m1* and *m2*; each component is added separately.

**See also **QMargins::operator+=() and QMargins::operator-=().

`[constexpr noexcept]`

QMargins operator+(const QMargins &*lhs*, int *rhs*)

Returns a QMargins object that is formed by adding *rhs* to *lhs*.

**See also **QMargins::operator+=() and QMargins::operator-=().

`[constexpr noexcept]`

QMargins operator+(int *lhs*, const QMargins &*rhs*)

Returns a QMargins object that is formed by adding *lhs* to *rhs*.

**See also **QMargins::operator+=() and QMargins::operator-=().

`[constexpr noexcept]`

QMargins operator+(const QMargins &*margins*)

Returns a QMargin object that is formed from all components of *margins*.

`[constexpr noexcept]`

QMargins operator-(const QMargins &*m1*, const QMargins &*m2*)

Returns a QMargins object that is formed by subtracting *m2* from *m1*; each component is subtracted separately.

**See also **QMargins::operator+=() and QMargins::operator-=().

`[constexpr noexcept]`

QMargins operator-(const QMargins &*lhs*, int *rhs*)

Returns a QMargins object that is formed by subtracting *rhs* from *lhs*.

**See also **QMargins::operator+=() and QMargins::operator-=().

`[constexpr noexcept]`

QMargins operator-(const QMargins &*margins*)

Returns a QMargin object that is formed by negating all components of *margins*.

`[constexpr]`

QMargins operator/(const QMargins &*margins*, int *divisor*)

Returns a QMargins object that is formed by dividing the components of the given *margins* by the given *divisor*.

**See also **QMargins::operator*=() and QMargins::operator/=().

`[constexpr]`

QMargins operator/(const QMargins &*margins*, qreal *divisor*)

This is an overloaded function.

Returns a QMargins object that is formed by dividing the components of the given *margins* by the given *divisor*.

**See also **QMargins::operator*=() and QMargins::operator/=().

### QDataStream &operator<<(QDataStream &*stream*, const QMargins &*m*)

Writes margin *m* to the given *stream* and returns a reference to the stream.

**See also **Serializing Qt Data Types.

`[constexpr noexcept]`

bool operator==(const QMargins &*m1*, const QMargins &*m2*)

Returns `true`

if *m1* and *m2* are equal; otherwise returns `false`

.

### QDataStream &operator>>(QDataStream &*stream*, QMargins &*m*)

Reads a margin from the given *stream* into margin *m* and returns a reference to the stream.

**See also **Serializing Qt Data Types.

`[constexpr noexcept, since 6.0]`

QMargins operator|(const QMargins &*m1*, const QMargins &*m2*)

Returns a QMargins object that is formed from the maximum of each component of *m2* and *m1*.

This function was introduced in Qt 6.0.

**See also **QMargins::operator+=() and QMargins::operator-=().

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