QBoxLayout Class

Member Function Documentation

[explicit] QBoxLayout::QBoxLayout(QBoxLayout::Direction dir, QWidget *parent = nullptr)

Constructs a new QBoxLayout with direction dir and parent widget parent.

The layout is set directly as the top-level layout for parent. There can be only one top-level layout for a widget. It is returned by QWidget::layout().

See also direction() and QWidget::setLayout().

[virtual noexcept] QBoxLayout::~QBoxLayout()

Destroys this box layout.

The layout's widgets aren't destroyed.

[override virtual] void QBoxLayout::addItem(QLayoutItem *item)

Reimplements: QLayout::addItem(QLayoutItem *item).

void QBoxLayout::addLayout(QLayout *layout, int stretch = 0)

Adds layout to the end of the box, with serial stretch factor stretch.

See also insertLayout(), addItem(), and addWidget().

void QBoxLayout::addSpacerItem(QSpacerItem *spacerItem)

Adds spacerItem to the end of this box layout.

See also addSpacing() and addStretch().

void QBoxLayout::addSpacing(int size)

Adds a non-stretchable space (a QSpacerItem) with size size to the end of this box layout. QBoxLayout provides default margin and spacing. This function adds additional space.

See also insertSpacing(), addItem(), and QSpacerItem.

void QBoxLayout::addStretch(int stretch = 0)

Adds a stretchable space (a QSpacerItem) with zero minimum size and stretch factor stretch to the end of this box layout.

See also insertStretch(), addItem(), and QSpacerItem.

void QBoxLayout::addStrut(int size)

Limits the perpendicular dimension of the box (e.g. height if the box is LeftToRight) to a minimum of size. Other constraints may increase the limit.

See also addItem().

void QBoxLayout::addWidget(QWidget *widget, int stretch = 0, Qt::Alignment alignment = Qt::Alignment())

Adds widget to the end of this box layout, with a stretch factor of stretch and alignment alignment.

The stretch factor applies only in the direction of the QBoxLayout, and is relative to the other boxes and widgets in this QBoxLayout. Widgets and boxes with higher stretch factors grow more.

If the stretch factor is 0 and nothing else in the QBoxLayout has a stretch factor greater than zero, the space is distributed according to the QWidget:sizePolicy() of each widget that's involved.

The alignment is specified by alignment. The default alignment is 0, which means that the widget fills the entire cell.

See also insertWidget(), addItem(), addLayout(), addStretch(), addSpacing(), and addStrut().

[override virtual] int QBoxLayout::count() const

Reimplements: QLayout::count() const.

QBoxLayout::Direction QBoxLayout::direction() const

Returns the direction of the box. addWidget() and addSpacing() work in this direction; the stretch stretches in this direction.

See also setDirection(), QBoxLayout::Direction, addWidget(), and addSpacing().

[override virtual] Qt::Orientations QBoxLayout::expandingDirections() const

Reimplements: QLayout::expandingDirections() const.

[override virtual] bool QBoxLayout::hasHeightForWidth() const

Reimplements: QLayoutItem::hasHeightForWidth() const.

[override virtual] int QBoxLayout::heightForWidth(int w) const

Reimplements: QLayoutItem::heightForWidth(int) const.

void QBoxLayout::insertItem(int index, QLayoutItem *item)

Inserts item into this box layout at position index. Index must be either negative or within the range 0 to count(), inclusive. If index is negative or count(), the item is added at the end.

See also addItem(), insertWidget(), insertLayout(), insertStretch(), and insertSpacing().

void QBoxLayout::insertLayout(int index, QLayout *layout, int stretch = 0)

Inserts layout at position index, with stretch factor stretch. If index is negative, the layout is added at the end.

layout becomes a child of the box layout.

See also addLayout() and insertItem().

void QBoxLayout::insertSpacerItem(int index, QSpacerItem *spacerItem)

Inserts spacerItem at position index, with zero minimum size and stretch factor. If index is negative the space is added at the end.

See also addSpacerItem(), insertStretch(), and insertSpacing().

void QBoxLayout::insertSpacing(int index, int size)

Inserts a non-stretchable space (a QSpacerItem) at position index, with size size. If index is negative the space is added at the end.

The box layout has default margin and spacing. This function adds additional space.

See also addSpacing(), insertItem(), and QSpacerItem.

void QBoxLayout::insertStretch(int index, int stretch = 0)

Inserts a stretchable space (a QSpacerItem) at position index, with zero minimum size and stretch factor stretch. If index is negative the space is added at the end.

See also addStretch(), insertItem(), and QSpacerItem.

void QBoxLayout::insertWidget(int index, QWidget *widget, int stretch = 0, Qt::Alignment alignment = Qt::Alignment())

Inserts widget at position index, with stretch factor stretch and alignment alignment. If index is negative, the widget is added at the end.

The stretch factor applies only in the direction of the QBoxLayout, and is relative to the other boxes and widgets in this QBoxLayout. Widgets and boxes with higher stretch factors grow more.

If the stretch factor is 0 and nothing else in the QBoxLayout has a stretch factor greater than zero, the space is distributed according to the QWidget:sizePolicy() of each widget that's involved.

The alignment is specified by alignment. The default alignment is 0, which means that the widget fills the entire cell.

See also addWidget() and insertItem().

[override virtual] void QBoxLayout::invalidate()

Reimplements: QLayout::invalidate().

Resets cached information.

[override virtual] QLayoutItem *QBoxLayout::itemAt(int index) const

Reimplements: QLayout::itemAt(int index) const.

[override virtual] QSize QBoxLayout::maximumSize() const

Reimplements: QLayout::maximumSize() const.

[override virtual] int QBoxLayout::minimumHeightForWidth(int w) const

Reimplements: QLayoutItem::minimumHeightForWidth(int w) const.

[override virtual] QSize QBoxLayout::minimumSize() const

Reimplements: QLayout::minimumSize() const.

void QBoxLayout::setDirection(QBoxLayout::Direction direction)

Sets the direction of this layout to direction.

See also direction().

[override virtual] void QBoxLayout::setGeometry(const QRect &r)

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

[override virtual] void QBoxLayout::setSpacing(int spacing)

Reimplements an access function for property: QLayout::spacing.

Reimplements QLayout::setSpacing(). Sets the spacing property to spacing.

See also QLayout::setSpacing() and spacing().

void QBoxLayout::setStretch(int index, int stretch)

Sets the stretch factor at position index. to stretch.

See also stretch().

bool QBoxLayout::setStretchFactor(QWidget *widget, int stretch)

Sets the stretch factor for widget to stretch and returns true if widget is found in this layout (not including child layouts); otherwise returns false.

See also setAlignment().

bool QBoxLayout::setStretchFactor(QLayout *layout, int stretch)

This is an overloaded function.

Sets the stretch factor for the layout layout to stretch and returns true if layout is found in this layout (not including child layouts); otherwise returns false.

[override virtual] QSize QBoxLayout::sizeHint() const

Reimplements: QLayoutItem::sizeHint() const.

[override virtual] int QBoxLayout::spacing() const

Reimplements an access function for property: QLayout::spacing.

Reimplements QLayout::spacing(). If the spacing property is valid, that value is returned. Otherwise, a value for the spacing property is computed and returned. Since layout spacing in a widget is style dependent, if the parent is a widget, it queries the style for the (horizontal or vertical) spacing of the layout. Otherwise, the parent is a layout, and it queries the parent layout for the spacing().

See also QLayout::spacing() and setSpacing().

int QBoxLayout::stretch(int index) const

Returns the stretch factor at position index.

See also setStretch().

[override virtual] QLayoutItem *QBoxLayout::takeAt(int index)

Reimplements: QLayout::takeAt(int index).