QwtDynGridLayout(3)

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>

  Public Member Functions

QwtDynGridLayout (QWidget *, int margin=0, int space=-1)
QwtDynGridLayout (int space=-1)
virtual ~QwtDynGridLayout ()
virtual void invalidate ()
void setMaxCols (uint maxCols)
uint maxCols () const
uint numRows () const
uint numCols () const
virtual void addItem (QLayoutItem *)
virtual QLayoutItem * itemAt (int index) const
virtual QLayoutItem * takeAt (int index)
virtual int count () const
void setExpandingDirections (Qt::Orientations)
virtual Qt::Orientations expandingDirections () const
QList< QRect > layoutItems (const QRect &, uint numCols) 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

  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, int margin = 0, int spacing = -1) [explicit] Parameters:
    parent Parent widget
    margin Margin
    spacing Spacing

  QwtDynGridLayout::QwtDynGridLayout (int spacing = -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 (int width) 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 (int width) 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 (int index) 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 (uint numCols, 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, uint numCols) 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::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()

  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 (uint maxCols) 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, uint numCols, 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 (int index) [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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