QwtDynGridLayout Class Reference

List of all members.

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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()).

Definition at line 32 of file 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

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Constructor & Destructor Documentation

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

Parameters: parent  Parent widget margin  Margin spacing  Spacing Definition at line 107 of file qwt_dyngrid_layout.cpp.

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

Parameters: spacing  Spacing Definition at line 133 of file qwt_dyngrid_layout.cpp.

QwtDynGridLayout::~QwtDynGridLayout (   )  [virtual]

Destructor. Definition at line 158 of file qwt_dyngrid_layout.cpp.

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Member Function Documentation

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

Adds item to the next free position. Definition at line 212 of file qwt_dyngrid_layout.cpp. References invalidate().

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: QwtDynGridLayout::maxCols(), QwtDynGridLayout::setMaxCols() Definition at line 353 of file qwt_dyngrid_layout.cpp. References isEmpty(), itemCount(), maxCols(), and numCols(). Referenced by heightForWidth(), QwtPlot::printLegend(), and setGeometry().

bool QwtDynGridLayout::hasHeightForWidth (   )  const [virtual]

Returns: true: QwtDynGridLayout implements heightForWidth. See also: QwtDynGridLayout::heightForWidth() Definition at line 547 of file qwt_dyngrid_layout.cpp.

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

Returns: The preferred height for this layout, given the width w. See also: QwtDynGridLayout::hasHeightForWidth() Definition at line 557 of file qwt_dyngrid_layout.cpp. References columnsForWidth(), isEmpty(), itemCount(), layoutGrid(), and numRows().

bool QwtDynGridLayout::isEmpty (   )  const [virtual]

Returns: true if this layout is empty. Definition at line 222 of file qwt_dyngrid_layout.cpp. Referenced by columnsForWidth(), heightForWidth(), maxItemWidth(), setGeometry(), sizeHint(), and stretchGrid().

uint QwtDynGridLayout::itemCount (   )  const

Returns: number of layout items Definition at line 231 of file qwt_dyngrid_layout.cpp. Referenced by columnsForWidth(), heightForWidth(), setGeometry(), and sizeHint().

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. Definition at line 518 of file qwt_dyngrid_layout.cpp. Referenced by heightForWidth(), and sizeHint().

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 Definition at line 440 of file qwt_dyngrid_layout.cpp. References d_data. Referenced by QwtPlot::printLegend(), and setGeometry().

uint QwtDynGridLayout::maxCols (   )  const

Return the upper limit for the number of columns. 0 means unlimited, what is the default. See also: QwtDynGridLayout::setMaxCols() Definition at line 205 of file qwt_dyngrid_layout.cpp. Referenced by columnsForWidth().

int QwtDynGridLayout::maxItemWidth (   )  const [virtual]

Returns: the maximum width of all layout items Definition at line 409 of file qwt_dyngrid_layout.cpp. References isEmpty().

uint QwtDynGridLayout::numCols (   )  const

Returns: Number of columns of the current layout. See also: QwtDynGridLayout::numRows Warning: The number of columns might change whenever the geometry changes Definition at line 688 of file qwt_dyngrid_layout.cpp. Referenced by columnsForWidth().

uint QwtDynGridLayout::numRows (   )  const

Returns: Number of rows of the current layout. See also: QwtDynGridLayout::numCols Warning: The number of rows might change whenever the geometry changes Definition at line 678 of file qwt_dyngrid_layout.cpp. Referenced by heightForWidth(), and sizeHint().

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

Reorganizes columns and rows and resizes managed widgets within the rectangle rect. Definition at line 314 of file qwt_dyngrid_layout.cpp. References columnsForWidth(), isEmpty(), itemCount(), and layoutItems().

void QwtDynGridLayout::setMaxCols (  uint  maxCols  )

Limit the number of columns. Parameters: maxCols  upper limit, 0 means unlimited See also: QwtDynGridLayout::maxCols() Definition at line 194 of file qwt_dyngrid_layout.cpp.

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: QwtDynGridLayout::maxCols(), QwtDynGridLayout::setMaxCols() Definition at line 647 of file qwt_dyngrid_layout.cpp. References isEmpty(), itemCount(), layoutGrid(), and numRows().

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: QwtDynGridLayout::setExpanding(), QwtDynGridLayout::expanding() Definition at line 586 of file qwt_dyngrid_layout.cpp. References expandingDirections(), and isEmpty().

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