QwtLegend(3)

NAME
QwtLegend -

SYNOPSIS

Detailed Description

The legend widget. The QwtLegend widget is a tabular arrangement of legend items. Legend items might be any type of widget, but in general they will be a QwtLegendItem.

See also:
    QwtLegendItem, QwtPlot

Definition at line 36 of file qwt_legend.h.

  Public Types
enum LegendDisplayPolicy { NoIdentifier = 0, FixedIdentifier = 1, AutoIdentifier = 2 }
enum LegendItemMode { ReadOnlyItem, ClickableItem, CheckableItem }

  Public Member Functions
QwtLegend (QWidget *parent=NULL)
virtual ~QwtLegend ()
void setDisplayPolicy (LegendDisplayPolicy policy, int mode)
LegendDisplayPolicy displayPolicy () const
void setItemMode (LegendItemMode)
LegendItemMode itemMode () const
int identifierMode () const
QWidget * contentsWidget ()
const QWidget * contentsWidget () const
void insert (const QwtPlotItem *, QWidget *)
void remove (const QwtPlotItem *)
QWidget * find (const QwtPlotItem *) const
QwtPlotItem * find (const QWidget *) const
virtual QList< QWidget * > legendItems () const
void clear ()
bool isEmpty () const
uint itemCount () const
virtual bool eventFilter (QObject *, QEvent *)
virtual QSize sizeHint () const
virtual int heightForWidth (int w) const
QScrollBar * horizontalScrollBar () const
QScrollBar * verticalScrollBar () const

  Protected Member Functions
virtual void resizeEvent (QResizeEvent *)
virtual void layoutContents ()

Member Enumeration Documentation

  enum QwtLegend::LegendDisplayPolicy

Display policy.

•   NoIdentifier
     The client code is responsible how to display of each legend item. The Qwt library will not interfere.

•   FixedIdentifier
     All legend items are displayed with the QwtLegendItem::IdentifierMode to be passed in 'mode'.

•   AutoIdentifier
     Each legend item is displayed with a mode that is a bitwise or of

•   QwtLegendItem::ShowLine (if its curve is drawn with a line) and

•   QwtLegendItem::ShowSymbol (if its curve is drawn with symbols) and

•   QwtLegendItem::ShowText (if the has a title).

Default is AutoIdentifier.

See also:
    setDisplayPolicy(), displayPolicy(), QwtLegendItem::IdentifierMode

Definition at line 62 of file qwt_legend.h.

  enum QwtLegend::LegendItemMode

Interaction mode for the legend items.

Definition at line 70 of file qwt_legend.h.

Constructor & Destructor Documentation

  QwtLegend::QwtLegend (QWidget * parent = NULL) [explicit]

Parameters:
    parent Parent widget

Definition at line 258 of file qwt_legend.cpp.

  QwtLegend::~QwtLegend () [virtual]

Destructor.

Definition at line 283 of file qwt_legend.cpp.

Member Function Documentation

  void QwtLegend::clear ()

Remove all items.

Definition at line 490 of file qwt_legend.cpp.

  const QWidget * QwtLegend::contentsWidget () const

The contents widget is the only child of the viewport() and the parent widget of all legend items.

Definition at line 375 of file qwt_legend.cpp.

  QWidget * QwtLegend::contentsWidget ()

The contents widget is the only child of the viewport() and the parent widget of all legend items.

Definition at line 355 of file qwt_legend.cpp.

Referenced by insert(), and QwtPlot::printLegend().

  QwtLegend::LegendDisplayPolicy QwtLegend::displayPolicy () const

Returns:
    the legend display policy. Default is LegendDisplayPolicy::Auto.

See also:
    setDisplayPolicy, LegendDisplayPolicy

Definition at line 324 of file qwt_legend.cpp.

Referenced by QwtPlotCurve::updateLegend().

  QwtPlotItem * QwtLegend::find (const QWidget * legendItem) const

Find the widget that represents a plot item

Parameters:
    plotItem Plot item

Returns:
    Widget on the legend, or NULL

Definition at line 471 of file qwt_legend.cpp.

  QWidget * QwtLegend::find (const QwtPlotItem * plotItem) const

Find the widget that represents a plot item

Parameters:
    plotItem Plot item

Returns:
    Widget on the legend, or NULL

Definition at line 460 of file qwt_legend.cpp.

Referenced by QwtPlotItem::updateLegend(), and QwtPlotCurve::updateLegend().

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

Returns:
    The preferred height, for the width w.

Parameters:
    width Width

Definition at line 518 of file qwt_legend.cpp.

  int QwtLegend::identifierMode () const

Returns:
    the IdentifierMode to be used in combination with LegendDisplayPolicy::Fixed.

Default is ShowLine | ShowSymbol | ShowText.

Definition at line 346 of file qwt_legend.cpp.

Referenced by QwtPlotCurve::updateLegend().

  void QwtLegend::insert (const QwtPlotItem * plotItem, QWidget * legendItem)

Insert a new item for a plot item

Parameters:
    plotItem Plot item
    legendItem New legend item

Note:
    The parent of item will be changed to QwtLegend::contentsWidget()

Definition at line 386 of file qwt_legend.cpp.

References contentsWidget().

Referenced by QwtPlotItem::updateLegend().

  bool QwtLegend::isEmpty () const

Return true, if there are no legend items.

Definition at line 617 of file qwt_legend.cpp.

Referenced by QwtPlotLayout::activate().

  uint QwtLegend::itemCount () const

Return the number of legend items.

Definition at line 623 of file qwt_legend.cpp.

  void QwtLegend::layoutContents () [protected, virtual]

Adjust contents widget and item layout to the size of the viewport().

Definition at line 543 of file qwt_legend.cpp.

Referenced by eventFilter().

  void QwtLegend::remove (const QwtPlotItem * plotItem)

Find the corresponding item for a plotItem and remove it from the item list.

Parameters:
    plotItem Plot item

Definition at line 482 of file qwt_legend.cpp.

  void QwtLegend::resizeEvent (QResizeEvent * e) [protected, virtual]

Resize event

Parameters:
    e Event

Definition at line 654 of file qwt_legend.cpp.

  void QwtLegend::setDisplayPolicy (LegendDisplayPolicy policy, int mode)

Set the legend display policy to:

Parameters:
    policy Legend display policy
    mode Identifier mode (or'd ShowLine, ShowSymbol, ShowText)

See also:
    displayPolicy, LegendDisplayPolicy

Definition at line 296 of file qwt_legend.cpp.

References QwtPlotItem::updateLegend().

  QSize QwtLegend::sizeHint () const [virtual]

Return a size hint.

Definition at line 506 of file qwt_legend.cpp.

Author

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