QwtDynGridLayout man page

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>

Public Member Functions

virtual void addItem (QLayoutItem *)

virtual uint columnsForWidth (int width) const

virtual int count () const

virtual Qt::Orientations expandingDirections () const

virtual bool hasHeightForWidth () const

virtual int heightForWidth (int) const

virtual void invalidate ()

virtual bool isEmpty () const

virtual QLayoutItem * itemAt (int index) const

uint itemCount () const

QList< QRect > layoutItems (const QRect &, uint numCols) const

uint maxCols () const

virtual int maxItemWidth () const

uint numCols () const

uint numRows () const

QwtDynGridLayout (QWidget *, int margin=0, int space=-1)

QwtDynGridLayout (int space=-1)

void setExpandingDirections (Qt::Orientations)

virtual void setGeometry (const QRect &rect)

void setMaxCols (uint maxCols)

virtual QSize sizeHint () const

virtual QLayoutItem * takeAt (int index)

virtual ~QwtDynGridLayout ()

Protected Member Functions

void layoutGrid (uint numCols, QwtArray< int > &rowHeight, QwtArray< int > &colWidth) const

void stretchGrid (const QRect &rect, uint numCols, QwtArray< int > &rowHeight, QwtArray< 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 maxCols()).

Constructor & Destructor Documentation

QwtDynGridLayout::QwtDynGridLayout (QWidget *parent, intmargin = 0, intspacing = -1) [explicit] Parameters

parent Parent widget
margin Margin
spacing Spacing

QwtDynGridLayout::QwtDynGridLayout (intspacing = -1) [explicit] Parameters

spacing Spacing

QwtDynGridLayout::~QwtDynGridLayout () [virtual]

Destructor.

Member Function Documentation

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

Adds item to the next free position.

uint QwtDynGridLayout::columnsForWidth (intwidth) const [virtual] Calculate the number of columns for a given width. It tries to use as many columns as possible (limited by maxCols())

Parameters:

width Available width for all columns

See also:

maxCols(), setMaxCols()

int QwtDynGridLayout::count () const [virtual] Returns

Number of items in the layout

Qt::Orientations QwtDynGridLayout::expandingDirections () const [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.

See also:

setExpandingDirections()

bool QwtDynGridLayout::hasHeightForWidth () const [virtual] Returns

true: QwtDynGridLayout implements heightForWidth.

See also:

heightForWidth()

int QwtDynGridLayout::heightForWidth (intwidth) const [virtual] Returns

The preferred height for this layout, given the width w.

See also:

hasHeightForWidth()

void QwtDynGridLayout::invalidate () [virtual]

Invalidate all internal caches.

bool QwtDynGridLayout::isEmpty () const [virtual] Returns

true if this layout is empty.

QLayoutItem * QwtDynGridLayout::itemAt (intindex) const [virtual] Find the item at a spcific index

Parameters:

index Index

See also:

takeAt()

uint QwtDynGridLayout::itemCount () const Returns

number of layout items

void QwtDynGridLayout::layoutGrid (uintnumCols, QwtArray< int > &rowHeight, QwtArray< int > &colWidth) const [protected] Calculate the dimensions for the columns and rows for a grid of numCols columns.

Parameters:

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

QList< QRect > QwtDynGridLayout::layoutItems (const QRect &rect, uintnumCols) const Calculate the geometries of the layout items for a layout with numCols columns and a given rect.

Parameters:

rect Rect where to place the items
numCols Number of columns

Returns:

item geometries

uint QwtDynGridLayout::maxCols () const Return the upper limit for the number of columns. 0 means unlimited, what is the default.

See also:

setMaxCols()

int QwtDynGridLayout::maxItemWidth () const [virtual] Returns

the maximum width of all layout items

uint QwtDynGridLayout::numCols () const Returns

Number of columns of the current layout.

See also:

numRows()

Warning:

The number of columns might change whenever the geometry changes

uint QwtDynGridLayout::numRows () const Returns

Number of rows of the current layout.

See also:

numCols()

Warning:

The number of rows might change whenever the geometry changes

void QwtDynGridLayout::setExpandingDirections (Qt::Orientationsexpanding) 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()

void QwtDynGridLayout::setGeometry (const QRect &rect) [virtual] Reorganizes columns and rows and resizes managed widgets within the rectangle rect.

Parameters:

rect Layout geometry

void QwtDynGridLayout::setMaxCols (uintmaxCols) Limit the number of columns.

Parameters:

maxCols upper limit, 0 means unlimited

See also:

maxCols()

QSize QwtDynGridLayout::sizeHint () const [virtual] Return the size hint. If maxCols() > 0 it is the size for a grid with maxCols() columns, otherwise it is the size for a grid with only one row.

See also:

maxCols(), setMaxCols()

void QwtDynGridLayout::stretchGrid (const QRect &rect, uintnumCols, QwtArray< int > &rowHeight, QwtArray< 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.

See also:

setExpanding(), expanding()

QLayoutItem * QwtDynGridLayout::takeAt (intindex) [virtual] Find the item at a spcific index and remove it from the layout

Parameters:

index Index

See also:

itemAt()

Author

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Info

Mon Aug 1 2011 Version 5.2.2 Qwt User's Guide