QwtDynGridLayout(3) Qwt User's Guide QwtDynGridLayout(3)

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

#include <qwt_dyngrid_layout.h>

Inherits QLayout.


QwtDynGridLayout (QWidget *, int margin=0, int spacing=-1)
QwtDynGridLayout (int spacing=-1)
virtual ~QwtDynGridLayout ()
Destructor. virtual void invalidate ()
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 *)
Add an item to the next free position. virtual QLayoutItem * itemAt (int index) const
virtual QLayoutItem * takeAt (int index)
virtual int count () const
void setExpandingDirections (Qt::Orientations)
virtual Qt::Orientations expandingDirections () const
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 &rect)
virtual bool hasHeightForWidth () const
virtual int heightForWidth (int) const
virtual QSize sizeHint () const
virtual bool isEmpty () const
uint itemCount () const
virtual uint columnsForWidth (int width) const
Calculate the number of columns for a given width.


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

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()).

Parameters:

parent Parent widget
margin Margin
spacing Spacing

Parameters:

spacing Spacing

Add an item to the next free position.

Parameters:

item Layout item

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()

Returns:

Number of items in the layout

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()

Returns:

true: QwtDynGridLayout implements heightForWidth().

See also:

heightForWidth()

Returns:

The preferred height for this layout, given a width.

See also:

hasHeightForWidth()

Returns:

true if this layout is empty.

Find the item at a specific index

Parameters:

index Index

Returns:

Item at a specific index

See also:

takeAt()

Returns:

number of layout items

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.

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

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()

Returns:

the maximum width of all layout items

Returns:

Number of columns of the current layout.

See also:

numRows()

Warning:

The number of columns might change whenever the geometry changes

Returns:

Number of rows of the current layout.

See also:

numColumns()

Warning:

The number of rows might change whenever the geometry changes

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()

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

Parameters:

rect Layout geometry

Limit the number of columns.

Parameters:

maxColumns upper limit, 0 means unlimited

See also:

maxColumns()

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()

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()

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()

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Wed Jan 2 2019 Version 6.1.4