QwtDynGridLayout - The QwtDynGridLayout class lays out widgets in a grid, adjusting the number of columns and rows to the current size.

NAME

QwtDynGridLayout − The QwtDynGridLayout class lays out widgets in a grid, adjusting the number of columns and rows to the current size.

SYNOPSIS

#include <qwt_dyngrid_layout.h>

Inherits QLayout.

Public Member Functions

QwtDynGridLayout (QWidget *, int margin=0, int spacing=−1)
QwtDynGridLayout (int spacing=−1)
virtual ˜QwtDynGridLayout ()
Destructor.
virtual void invalidate () override
Invalidate all internal caches.
void setMaxColumns (uint maxColumns)
uint maxColumns () const
Return the upper limit for the number of columns.
uint numRows () const
uint numColumns () const
virtual void addItem (QLayoutItem *) override
Add an item to the next free position.
virtual QLayoutItem * itemAt (int index) const override
virtual QLayoutItem * takeAt (int index) override
virtual int count () const override
void setExpandingDirections (Qt::Orientations)
virtual Qt::Orientations expandingDirections () const override
Returns whether this layout can make use of more space than sizeHint().
QList< QRect > layoutItems (const QRect &, uint numColumns) const
virtual int maxItemWidth () const
virtual void setGeometry (const QRect &) override
virtual bool hasHeightForWidth () const override
virtual int heightForWidth (int) const override
virtual QSize sizeHint () const override
virtual bool isEmpty () const override
uint itemCount () const
virtual uint columnsForWidth (int width) const
Calculate the number of columns for a given width.

Protected Member Functions

void layoutGrid (uint numColumns, QVector< int > &rowHeight, QVector< int > &colWidth) const
void stretchGrid (const QRect &rect, uint numColumns, QVector< int > &rowHeight, QVector< int > &colWidth) const

Detailed Description

The QwtDynGridLayout class lays out widgets in a grid, adjusting the number of columns and rows to the current size.

QwtDynGridLayout takes the space it gets, divides it up into rows and columns, and puts each of the widgets it manages into the correct cell(s). It lays out as many number of columns as possible (limited by maxColumns()).

Definition at line 27 of file qwt_dyngrid_layout.h.

Constructor & Destructor Documentation

QwtDynGridLayout::QwtDynGridLayout (QWidget * parent, int margin = 0, intspacing = −1) [explicit]

Parameters

parent Parent widget
margin Margin
spacing Spacing

Definition at line 58 of file qwt_dyngrid_layout.cpp.

QwtDynGridLayout::QwtDynGridLayout (int spacing = −1) [explicit]

Parameters

spacing Spacing

Definition at line 71 of file qwt_dyngrid_layout.cpp.

QwtDynGridLayout::˜QwtDynGridLayout () [virtual]

Destructor.

Definition at line 88 of file qwt_dyngrid_layout.cpp.

Member Function Documentation

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

Add an item to the next free position.

Parameters

item Layout item

Definition at line 128 of file qwt_dyngrid_layout.cpp.

uint QwtDynGridLayout::columnsForWidth (int width) const [virtual]

Calculate the number of columns for a given width. The calculation tries to use as many columns as possible ( limited by maxColumns() )

Parameters

width Available width for all columns

Returns

Number of columns for a given width

See also

maxColumns(), setMaxColumns()

Definition at line 256 of file qwt_dyngrid_layout.cpp.

int QwtDynGridLayout::count () const [override], [virtual]

Returns

Number of items in the layout

Definition at line 182 of file qwt_dyngrid_layout.cpp.

Qt::Orientations QwtDynGridLayout::expandingDirections () const [override],[virtual]

Returns whether this layout can make use of more space than sizeHint(). A value of Qt::Vertical or Qt::Horizontal means that it wants to grow in only one dimension, while Qt::Vertical | Qt::Horizontal means that it wants to grow in both dimensions.

Returns

Orientations, where the layout expands

See also

setExpandingDirections()

Definition at line 211 of file qwt_dyngrid_layout.cpp.

bool QwtDynGridLayout::hasHeightForWidth () const [override], [virtual]

Returns

true: QwtDynGridLayout implements heightForWidth().

See also

heightForWidth()

Definition at line 446 of file qwt_dyngrid_layout.cpp.

int QwtDynGridLayout::heightForWidth (int width) const [override],[virtual]

Returns

The preferred height for this layout, given a width.

See also

hasHeightForWidth()

Definition at line 455 of file qwt_dyngrid_layout.cpp.

void QwtDynGridLayout::invalidate () [override], [virtual]

Invalidate all internal caches.

Definition at line 95 of file qwt_dyngrid_layout.cpp.

bool QwtDynGridLayout::isEmpty () const [override], [virtual]

Returns

true if this layout is empty.

Definition at line 137 of file qwt_dyngrid_layout.cpp.

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

Find the item at a specific index

Parameters

index Index

Returns

Item at a specific index

See also

takeAt()

Definition at line 157 of file qwt_dyngrid_layout.cpp.

uint QwtDynGridLayout::itemCount () const

Returns

number of layout items

Definition at line 145 of file qwt_dyngrid_layout.cpp.

void QwtDynGridLayout::layoutGrid (uint numColumns, QVector< int > &rowHeight, QVector< int > & colWidth) const [protected]

Calculate the dimensions for the columns and rows for a grid of numColumns columns.

Parameters

numColumns Number of columns.
rowHeight Array where to fill in the calculated row heights.
colWidth Array where to fill in the calculated column widths.

Definition at line 419 of file qwt_dyngrid_layout.cpp.

QList< QRect > QwtDynGridLayout::layoutItems (const QRect & rect, uintnumColumns) const

Calculate the geometries of the layout items for a layout with numColumns columns and a given rectangle.

Parameters

rect Rect where to place the items
numColumns Number of columns

Returns

item geometries

Definition at line 344 of file qwt_dyngrid_layout.cpp.

uint QwtDynGridLayout::maxColumns () const

Return the upper limit for the number of columns. 0 means unlimited, what is the default.

Returns

Upper limit for the number of columns

See also

setMaxColumns()

Definition at line 119 of file qwt_dyngrid_layout.cpp.

int QwtDynGridLayout::maxItemWidth () const [virtual]

Returns

the maximum width of all layout items

Definition at line 316 of file qwt_dyngrid_layout.cpp.

uint QwtDynGridLayout::numColumns () const

Returns

Number of columns of the current layout.

See also

numRows()

Warning

The number of columns might change whenever the geometry changes

Definition at line 596 of file qwt_dyngrid_layout.cpp.

uint QwtDynGridLayout::numRows () const

Returns

Number of rows of the current layout.

See also

numColumns()

Warning

The number of rows might change whenever the geometry changes

Definition at line 586 of file qwt_dyngrid_layout.cpp.

void QwtDynGridLayout::setExpandingDirections (Qt::Orientations expanding)

Set whether this layout can make use of more space than sizeHint(). A value of Qt::Vertical or Qt::Horizontal means that it wants to grow in only one dimension, while Qt::Vertical | Qt::Horizontal means that it wants to grow in both dimensions. The default value is 0.

Parameters

expanding Or’d orientations

See also

expandingDirections()

Definition at line 196 of file qwt_dyngrid_layout.cpp.

void QwtDynGridLayout::setGeometry (const QRect & rect) [override],[virtual]

Reorganizes columns and rows and resizes managed items within a rectangle.

Parameters

rect Layout geometry

Definition at line 222 of file qwt_dyngrid_layout.cpp.

void QwtDynGridLayout::setMaxColumns (uint maxColumns)

Limit the number of columns.

Parameters

maxColumns upper limit, 0 means unlimited

See also

maxColumns()

Definition at line 106 of file qwt_dyngrid_layout.cpp.

QSize QwtDynGridLayout::sizeHint () const [override], [virtual]

Return the size hint. If maxColumns() > 0 it is the size for a grid with maxColumns() columns, otherwise it is the size for a grid with only one row.

Returns

Size hint

See also

maxColumns(), setMaxColumns()

Definition at line 550 of file qwt_dyngrid_layout.cpp.

void QwtDynGridLayout::stretchGrid (const QRect & rect, uint numColumns,QVector< int > & rowHeight, QVector< int > & colWidth) const[protected]

Stretch columns in case of expanding() & QSizePolicy::Horizontal and rows in case of expanding() & QSizePolicy::Vertical to fill the entire rect. Rows and columns are stretched with the same factor.

Parameters

rect Bounding rectangle
numColumns Number of columns
rowHeight Array to be filled with the calculated row heights
colWidth Array to be filled with the calculated column widths

See also

setExpanding(), expanding()

Definition at line 491 of file qwt_dyngrid_layout.cpp.

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

Find the item at a specific index and remove it from the layout

Parameters

index Index

Returns

Layout item, removed from the layout

See also

itemAt()

Definition at line 172 of file qwt_dyngrid_layout.cpp.

Author

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Updated 2026-06-01 - jenkler.se | uex.se