class QBoxLayout¶

The QBoxLayout class lines up child widgets horizontally or vertically. More…

Inherited by: QVBoxLayout, QHBoxLayout

Synopsis¶

Methods¶

def __init__()
def addLayout()
def addSpacerItem()
def addSpacing()
def addStretch()
def addStrut()
def addWidget()
def direction()
def insertItem()
def insertLayout()
def insertSpacerItem()
def insertSpacing()
def insertStretch()
def insertWidget()
def setDirection()
def setStretch()
def setStretchFactor()
def stretch()

Note

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Detailed Description¶

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:

addWidget() to add a widget to the QBoxLayout and set the widget’s stretch factor. (The stretch factor is along the row of boxes.)

addSpacing() to create an empty box; this is one of the functions you use to create nice and spacious dialogs. See below for ways to set margins.

addStretch() to create an empty, stretchable box.

addLayout() to add a box containing another QLayout to the row and set that layout’s stretch factor.

Use insertWidget() , insertSpacing() , insertStretch() or insertLayout() to insert a box at a specified position in the layout.

QBoxLayout also includes two margin widths:

setContentsMargins() sets the width of the outer border on each side of the widget. This is the width of the reserved space along each of the QBoxLayout ‘s four sides.

setSpacing() sets the width between neighboring boxes. (You can use addSpacing() to get more space at a particular spot.)

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 hide() on a widget also effectively removes the widget from the layout until 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 Layout Management

class Direction¶

This type is used to determine the direction of a box layout.

Constant

Description

QBoxLayout.LeftToRight

Horizontal from left to right.

QBoxLayout.RightToLeft

Horizontal from right to left.

QBoxLayout.TopToBottom

Vertical from top to bottom.

QBoxLayout.BottomToTop

Vertical from bottom to top.

Constant	Description
QBoxLayout.LeftToRight	Horizontal from left to right.
QBoxLayout.RightToLeft	Horizontal from right to left.
QBoxLayout.TopToBottom	Vertical from top to bottom.
QBoxLayout.BottomToTop	Vertical from bottom to top.

__init__(arg__1[, parent=None])¶

Parameters:

arg__1 – Direction
parent – QWidget

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 layout() .

See also

direction() setLayout()

addLayout(layout[, stretch=0])¶

Parameters:

layout – QLayout
stretch – int

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

See also

insertLayout() addItem() addWidget()

addSpacerItem(spacerItem)¶

Parameters:: spacerItem – QSpacerItem

Adds spacerItem to the end of this box layout.

See also

addSpacing() addStretch()

addSpacing(size)¶

Parameters:: size – int

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() QSpacerItem

addStretch([stretch=0])¶

Parameters:: stretch – int

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() QSpacerItem

addStrut(arg__1)¶

Parameters:: arg__1 – int

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()

addWidget(arg__1[, stretch=0[, alignment=Qt.Alignment()]])¶

Parameters:

arg__1 – QWidget
stretch – int
alignment – Combination of AlignmentFlag

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() addStrut()

direction()¶

Return type:: Direction

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

See also

setDirection() Direction addWidget() addSpacing()

insertItem(index, arg__2)¶

Parameters:

index – int
arg__2 – QLayoutItem

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() insertSpacing()

insertLayout(index, layout[, stretch=0])¶

Parameters:

index – int
layout – QLayout
stretch – int

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() insertItem()

insertSpacerItem(index, spacerItem)¶

Parameters:

index – int
spacerItem – QSpacerItem

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() insertSpacing()

insertSpacing(index, size)¶

Parameters:

index – int
size – int

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() QSpacerItem

insertStretch(index[, stretch=0])¶

Parameters:

index – int
stretch – int

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() QSpacerItem

insertWidget(index, widget[, stretch=0[, alignment=Qt.Alignment()]])¶

Parameters:

index – int
widget – QWidget
stretch – int
alignment – Combination of AlignmentFlag

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.

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

See also

addWidget() insertItem()

setDirection(arg__1)¶

Parameters:: arg__1 – Direction

Sets the direction of this layout to direction.

See also

direction()

setStretch(index, stretch)¶

Parameters:

index – int
stretch – int

Sets the stretch factor at position index. to stretch.

See also

stretch()

setStretchFactor(l, stretch)¶

Parameters:

l – QLayout
stretch – int

Return type:

bool

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.

setStretchFactor(w, stretch)

Parameters:

w – QWidget
stretch – int

Return type:

bool

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()

stretch(index)¶

Parameters:: index – int
Return type:: int

Returns the stretch factor at position index.

See also

setStretch()