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>

Inherits QLayout.

  Public Member Functions
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.

  Protected Member Functions
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

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 maxColumns()).

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

Member Function Documentation

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

Add an item to the next free position.

Parameters:
    item Layout item

  uint QwtDynGridLayout::columnsForWidth (int width) const [virtual]

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()

  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.

Returns:
    Orientations, where the layout expands

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 a width.

See also:
    hasHeightForWidth()

  bool QwtDynGridLayout::isEmpty () const [virtual]

Returns:
    true if this layout is empty.

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

Parameters:
    index Index

Returns:
    Item at a specific index

See also:
    takeAt()

  uint QwtDynGridLayout::itemCount () const

Returns:
    number of layout items

  void QwtDynGridLayout::layoutGrid (uint numColumns, QVector< int > & rowHeight, QVector< int > & colWidth) const [protected]
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.

  QList< QRect > QwtDynGridLayout::layoutItems (const QRect & rect, uint numColumns) const
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

  uint QwtDynGridLayout::maxColumns () const

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()

  int QwtDynGridLayout::maxItemWidth () const [virtual]

Returns:
    the maximum width of all layout items

  uint QwtDynGridLayout::numColumns () 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:
    numColumns()

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 items within a rectangle.

Parameters:
    rect Layout geometry

  void QwtDynGridLayout::setMaxColumns (uint maxColumns)
Limit the number of columns.

Parameters:
    maxColumns upper limit, 0 means unlimited

See also:
    maxColumns()

  QSize QwtDynGridLayout::sizeHint () const [virtual]
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()

  void QwtDynGridLayout::stretchGrid (const QRect & rect, uint numColumns, 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.

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()

  QLayoutItem * QwtDynGridLayout::takeAt (int index) [virtual]
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()

Author

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