The QBoxLayout class lines up child widgets horizontally or vertically. More...
| Header: | #include <QBoxLayout> |
| qmake: | QT += widgets |
| Inherits: | QLayout |
| Inherited By: |
| enum | Direction { LeftToRight, RightToLeft, TopToBottom, BottomToTop } |
| QBoxLayout(QBoxLayout::Direction dir, QWidget *parent = nullptr) | |
| virtual | ~QBoxLayout() |
| void | addLayout(QLayout *layout, int stretch = 0) |
| void | addSpacerItem(QSpacerItem *spacerItem) |
| void | addSpacing(int size) |
| void | addStretch(int stretch = 0) |
| void | addStrut(int size) |
| void | addWidget(QWidget *widget, int stretch = 0, Qt::Alignment alignment = ...) |
| QBoxLayout::Direction | direction() const |
| void | insertItem(int index, QLayoutItem *item) |
| void | insertLayout(int index, QLayout *layout, int stretch = 0) |
| void | insertSpacerItem(int index, QSpacerItem *spacerItem) |
| void | insertSpacing(int index, int size) |
| void | insertStretch(int index, int stretch = 0) |
| void | insertWidget(int index, QWidget *widget, int stretch = 0, Qt::Alignment alignment = ...) |
| void | setDirection(QBoxLayout::Direction direction) |
| void | setSpacing(int spacing) |
| void | setStretch(int index, int stretch) |
| bool | setStretchFactor(QWidget *widget, int stretch) |
| bool | setStretchFactor(QLayout *layout, int stretch) |
| int | spacing() const |
| int | stretch(int index) const |
| virtual void | addItem(QLayoutItem *item) override |
| virtual int | count() const override |
| virtual Qt::Orientations | expandingDirections() const override |
| virtual bool | hasHeightForWidth() const override |
| virtual int | heightForWidth(int w) const override |
| virtual void | invalidate() override |
| virtual QLayoutItem * | itemAt(int index) const override |
| virtual QSize | maximumSize() const override |
| virtual int | minimumHeightForWidth(int w) const override |
| virtual QSize | minimumSize() const override |
| virtual void | setGeometry(const QRect &r) override |
| virtual QSize | sizeHint() const override |
| virtual QLayoutItem * | takeAt(int index) override |
The QBoxLayout class lines up child widgets horizontally or vertically.
QBoxLayout takes the space it gets (from its parent layout or from the parentWidget()), divides it up into a row of boxes, and makes each managed widget fill one box.
If the QBoxLayout's orientation is Qt::Horizontal the boxes are placed in a row, with suitable sizes. Each widget (or other box) will get at least its minimum size and at most its maximum size. Any excess space is shared according to the stretch factors (more about that below).
If the QBoxLayout's orientation is Qt::Vertical, the boxes are placed in a column, again with suitable sizes.
The easiest way to create a QBoxLayout is to use one of the convenience classes, e.g. QHBoxLayout (for Qt::Horizontal boxes) or QVBoxLayout (for Qt::Vertical boxes). You can also use the QBoxLayout constructor directly, specifying its direction as LeftToRight, RightToLeft, TopToBottom, or BottomToTop.
If the QBoxLayout is not the top-level layout (i.e. it is not managing all of the widget's area and children), you must add it to its parent layout before you can do anything with it. The normal way to add a layout is by calling parentLayout->addLayout().
Once you have done this, you can add boxes to the QBoxLayout using one of four functions:
Use insertWidget(), insertSpacing(), insertStretch() or insertLayout() to insert a box at a specified position in the layout.
QBoxLayout also includes two margin widths:
The margin default is provided by the style. The default margin most Qt styles specify is 9 for child widgets and 11 for windows. The spacing defaults to the same as the margin width for a top-level layout, or to the same as the parent layout.
To remove a widget from a layout, call removeWidget(). Calling QWidget::hide() on a widget also effectively removes the widget from the layout until QWidget::show() is called.
You will almost always want to use QVBoxLayout and QHBoxLayout rather than QBoxLayout because of their convenient constructors.
See also QGridLayout, QStackedLayout, and Layout Management.
This type is used to determine the direction of a box layout.
| Constant | Value | Description |
|---|---|---|
QBoxLayout::LeftToRight |
0 |
Horizontal from left to right. |
QBoxLayout::RightToLeft |
1 |
Horizontal from right to left. |
QBoxLayout::TopToBottom |
2 |
Vertical from top to bottom. |
QBoxLayout::BottomToTop |
3 |
Vertical from bottom to top. |
Constructs a new QBoxLayout with direction dir and parent widget parent.
See also direction().
[virtual] QBoxLayout::~QBoxLayout()Destroys this box layout.
The layout's widgets aren't destroyed.
[override virtual] void QBoxLayout::addItem(QLayoutItem *item)Reimplemented from QLayout::addItem().
Adds layout to the end of the box, with serial stretch factor stretch.
See also insertLayout(), addItem(), and addWidget().
Adds spacerItem to the end of this box layout.
This function was introduced in Qt 4.4.
See also addSpacing() and addStretch().
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.
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.
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().
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() constReimplemented from QLayout::count().
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() constReimplemented from QLayout::expandingDirections().
[override virtual] bool QBoxLayout::hasHeightForWidth() constReimplemented from QLayoutItem::hasHeightForWidth().
[override virtual] int QBoxLayout::heightForWidth(int w) constReimplemented from QLayoutItem::heightForWidth().
Inserts item into this box layout at position index. If index is negative, the item is added at the end.
See also addItem(), insertWidget(), insertLayout(), insertStretch(), and insertSpacing().
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().
Inserts spacerItem at position index, with zero minimum size and stretch factor. If index is negative the space is added at the end.
This function was introduced in Qt 4.4.
See also addSpacerItem(), insertStretch(), and insertSpacing().
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.
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.
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()Reimplemented from QLayout::invalidate().
Resets cached information.
[override virtual] QLayoutItem *QBoxLayout::itemAt(int index) constReimplemented from QLayout::itemAt().
[override virtual] QSize QBoxLayout::maximumSize()
constReimplemented from QLayout::maximumSize().
[override virtual] int QBoxLayout::minimumHeightForWidth(int w) constReimplemented from QLayoutItem::minimumHeightForWidth().
[override virtual] QSize QBoxLayout::minimumSize()
constReimplemented from QLayout::minimumSize().
Sets the direction of this layout to direction.
See also direction().
[override virtual] void QBoxLayout::setGeometry(const QRect &r)Reimplemented from QLayout::setGeometry().
Reimplements QLayout::setSpacing(). Sets the spacing property to spacing.
See also QLayout::setSpacing() and spacing().
Sets the stretch factor at position index. to stretch.
This function was introduced in Qt 4.5.
See also 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().
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() constReimplemented from QLayoutItem::sizeHint().
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().
Returns the stretch factor at position index.
This function was introduced in Qt 4.5.
See also setStretch().
[override virtual] QLayoutItem *QBoxLayout::takeAt(int index)Reimplemented from QLayout::takeAt().
