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

# QSpacerItem Class

The QSpacerItem class provides blank space in a layout. More...

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

- List of all members, including inherited members

## Public Functions

| QSpacerItem(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)
virtual | ~QSpacerItem()
void | changeSize(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)
QSizePolicy | sizePolicy() const

## Reimplemented Public Functions

virtual Qt::Orientations | expandingDirections() const override
virtual QRect | geometry() const override
virtual bool | isEmpty() const override
virtual QSize | maximumSize() const override
virtual QSize | minimumSize() const override
virtual void | setGeometry(const QRect &r) override
virtual QSize | sizeHint() const override
virtual QSpacerItem * | spacerItem() override

## Detailed Description

Normally, you don't need to use this class directly. Qt's built-in layout managers provide the following functions for manipulating empty space in layouts:

Class | Functions
--- | ---
QHBoxLayout | addSpacing(), addStretch(), insertSpacing(), insertStretch()
QGridLayout | setRowMinimumHeight(), setRowStretch(), setColumnMinimumWidth(), setColumnStretch()

See also QLayout, QWidgetItem, and QLayoutItem::spacerItem().

## Member Function Documentation

### QSpacerItem::QSpacerItem(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)

Constructs a spacer item with preferred width w, preferred height h, horizontal size policy hPolicy and vertical size policy vPolicy.

The default values provide a gap that is able to stretch if nothing else wants the space.

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

Destructor.

### void QSpacerItem::changeSize(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum)

Changes this spacer item to have preferred width w, preferred height h, horizontal size policy hPolicy and vertical size policy vPolicy.

The default values provide a gap that is able to stretch if nothing else wants the space.

Note that if changeSize() is called after the spacer item has been added to a layout, it is necessary to invalidate the layout in order for the spacer item's new size to take effect.

See also QSpacerItem::invalidate().

### `[override virtual]` Qt::Orientations QSpacerItem::expandingDirections() const

Reimplements: QLayoutItem::expandingDirections() const.

### `[override virtual]` QRect QSpacerItem::geometry() const

Reimplements: QLayoutItem::geometry() const.

See also setGeometry().

### `[override virtual]` bool QSpacerItem::isEmpty() const

Reimplements: QLayoutItem::isEmpty() const.

Returns `true`.

### `[override virtual]` QSize QSpacerItem::maximumSize() const

Reimplements: QLayoutItem::maximumSize() const.

### `[override virtual]` QSize QSpacerItem::minimumSize() const

Reimplements: QLayoutItem::minimumSize() const.

### `[override virtual]` void QSpacerItem::setGeometry(const QRect &r)

Reimplements: QLayoutItem::setGeometry(const QRect &r).

See also geometry().

### `[override virtual]` QSize QSpacerItem::sizeHint() const

Reimplements: QLayoutItem::sizeHint() const.

### QSizePolicy QSpacerItem::sizePolicy() const

Returns the size policy of this item.

### `[override virtual]` QSpacerItem *QSpacerItem::spacerItem()

Reimplements: QLayoutItem::spacerItem().

Returns a pointer to this object.