QwtDynGridLayout Class Reference

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

#include <qwt_dyngrid_layout.h>

List of all members.

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

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()
Generated on Sun Nov 21 12:01:34 2010 for Qwt User's Guide by  doxygen 1.6.3