Qwt User's Guide: QwtLegend Class Reference

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# QwtLegend Class Reference

The legend widget. More...

`#include <qwt_legend.h>`

List of all members.

## Public Types
enum | LegendItemMode { ReadOnlyItem, ClickableItem, CheckableItem }
## Public Member Functions
void | clear ()
QWidget * | contentsWidget ()
const QWidget * | contentsWidget () const
virtual bool | eventFilter (QObject *, QEvent *)
QWidget * | find (const QwtLegendItemManager *) const
QwtLegendItemManager * | find (const QWidget *) const
virtual int | heightForWidth (int w) const
QScrollBar * | horizontalScrollBar () const
void | insert (const QwtLegendItemManager *, QWidget *)
bool | isEmpty () const
uint | itemCount () const
LegendItemMode | itemMode () const
virtual QList< QWidget * > | legendItems () const
| QwtLegend (QWidget *parent=NULL)
void | remove (const QwtLegendItemManager *)
void | setItemMode (LegendItemMode)
virtual QSize | sizeHint () const
QScrollBar * | verticalScrollBar () const
virtual | ~QwtLegend ()
## Protected Member Functions
virtual void | layoutContents ()

## 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, QwtLegendItemManager QwtPlot

## Member Enumeration Documentation

enum QwtLegend::LegendItemMode

Interaction mode for the legend items.

The default is QwtLegend::ReadOnlyItem.

See also:
  setItemMode(), itemMode(), QwtLegendItem::IdentifierMode QwtLegendItem::clicked(), QwtLegendItem::checked(), QwtPlot::legendClicked(), QwtPlot::legendChecked()

Enumerator:

  ReadOnlyItem | The legend item is not interactive, like a label.
  ClickableItem | The legend item is clickable, like a push button.
  CheckableItem | The legend item is checkable, like a checkable button.

## Constructor & Destructor Documentation

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

Constructor

Parameters:

  parent | Parent widget

QwtLegend::~QwtLegend | ( |  | ) | `[virtual]`

Destructor.

## Member Function Documentation

void QwtLegend::clear | ( |  | ) |

Remove all items.

QWidget * QwtLegend::contentsWidget | ( |  | ) |

The contents widget is the only child of the viewport of the internal QScrollArea and the parent widget of all legend items.

Returns:
  Container widget of the legend items

const QWidget * QwtLegend::contentsWidget | ( |  | ) | const

The contents widget is the only child of the viewport of the internal QScrollArea and the parent widget of all legend items.

Returns:
  Container widget of the legend items

bool QwtLegend::eventFilter | ( | QObject * | object,
|  | QEvent * | event
| ) |  | `[virtual]`

Handle QEvent::ChildRemoved andQEvent::LayoutRequest events for the contentsWidget().

Parameters:

  object | Object to be filtered
  event | Event

QwtLegendItemManager * QwtLegend::find | ( | const QWidget * | legendItem | ) | const

Find the widget that represents a plot item

Parameters:

  legendItem | Legend item

Returns:
  Widget on the legend, or NULL

QWidget * QwtLegend::find | ( | const QwtLegendItemManager * | plotItem | ) | const

Find the widget that represents a plot item

Parameters:

  plotItem | Plot item

Returns:
  Widget on the legend, or NULL

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

Returns:
  The preferred height, for the width w.

Parameters:

  width | Width

QScrollBar * QwtLegend::horizontalScrollBar | ( |  | ) | const

Returns:
  Horizontal scrollbar

See also:
  verticalScrollBar()

void QwtLegend::insert | ( | const QwtLegendItemManager * | 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 contentsWidget()

bool QwtLegend::isEmpty | ( |  | ) | const

Return true, if there are no legend items.

uint QwtLegend::itemCount | ( |  | ) | const

Return the number of legend items.

QwtLegend::LegendItemMode QwtLegend::itemMode | ( |  | ) | const

See also:
  LegendItemMode

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

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

QList< QWidget * > QwtLegend::legendItems | ( |  | ) | const`[virtual]`

Return a list of all legend items.

void QwtLegend::remove | ( | const QwtLegendItemManager * | plotItem | ) |

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

Parameters:

  plotItem | Plot item

void QwtLegend::setItemMode | ( | LegendItemMode | mode | ) |

See also:
  LegendItemMode

QSize QwtLegend::sizeHint | ( |  | ) | const`[virtual]`

Return a size hint.

QScrollBar * QwtLegend::verticalScrollBar | ( |  | ) | const

Returns:
  Vertical scrollbar

See also:
  horizontalScrollBar()