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QwtDynGridLayout

NAME

QwtDynGridLayout -

SYNOPSIS

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

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.

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().

Author

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