# QwtLegendItem Class Reference

A legend label. More...

`#include <qwt_legend_item.h>`

Inheritance diagram for QwtLegendItem:
[legend]

List of all members.

## Public Types
enum | IdentifierMode { NoIdentifier = 0, ShowLine = 1, ShowSymbol = 2, ShowText = 4 }
## Public Slots
void | setChecked (bool on)
## Signals
void | clicked ()
void | pressed ()
void | released ()
void | checked (bool)
## Public Member Functions
| QwtLegendItem (QWidget *parent=0)
| QwtLegendItem (const QwtSymbol &, const QPen &, const QwtText &, QWidget *parent=0)
virtual | ~QwtLegendItem ()
virtual void | setText (const QwtText &)
void | setItemMode (QwtLegend::LegendItemMode)
QwtLegend::LegendItemMode | itemMode () const
void | setIdentifierMode (int)
int | identifierMode () const
void | setIdentifierWidth (int width)
int | identifierWidth () const
void | setSpacing (int spacing)
int | spacing () const
void | setSymbol (const QwtSymbol &)
const QwtSymbol & | symbol () const
void | setCurvePen (const QPen &)
const QPen & | curvePen () const
virtual void | drawIdentifier (QPainter *, const QRect &) const
virtual void | drawItem (QPainter *p, const QRect &) const
virtual QSize | sizeHint () const
bool | isChecked () const
## Protected Member Functions
void | setDown (bool)
bool | isDown () const
virtual void | paintEvent (QPaintEvent *)
virtual void | mousePressEvent (QMouseEvent *)
virtual void | mouseReleaseEvent (QMouseEvent *)
virtual void | keyPressEvent (QKeyEvent *)
virtual void | keyReleaseEvent (QKeyEvent *)
virtual void | drawText (QPainter *, const QRect &)

## Detailed Description

A legend label.

QwtLegendItem represents a curve on a legend. It displays an curve identifier with an explaining text. The identifier might be a combination of curve symbol and line. In readonly mode it behaves like a label, otherwise like an unstylish push button.

See also:
  QwtLegend, QwtPlotCurve

## Member Enumeration Documentation

enum QwtLegendItem::IdentifierMode

Identifier mode.

Default is ShowLine | ShowText

See also:
  identifierMode(), setIdentifierMode()

## Constructor & Destructor Documentation

QwtLegendItem::QwtLegendItem | ( | QWidget * | parent = `0` | ) | `[explicit]`

Parameters:

  | parent | Parent widget

QwtLegendItem::QwtLegendItem | ( | const QwtSymbol & | symbol,
|  | const QPen & | curvePen,
|  | const QwtText & | text,
|  | QWidget * | parent = `0` |
| ) |  |  | `[explicit]`

Parameters:

  | symbol | Curve symbol
  | curvePen | Curve pen
  | text | Label text
  | parent | Parent widget

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

Destructor.

## Member Function Documentation

void QwtLegendItem::checked | ( | bool |  | ) | `[signal]`

Signal, when the legend item has been toggled.

void QwtLegendItem::clicked | ( |  | ) | `[signal]`

Signal, when the legend item has been clicked.

const QPen & QwtLegendItem::curvePen | ( |  | ) | const

Returns:
  The curve pen.

See also:
  setCurvePen()

void QwtLegendItem::drawIdentifier | ( | QPainter * | painter,
|  | const QRect & | rect |
| ) |  |  | const`[virtual]`

Paint the identifier to a given rect.

Parameters:

  | painter | Painter
  | rect | Rect where to paint

void QwtLegendItem::drawItem | ( | QPainter * | painter,
|  | const QRect & | rect |
| ) |  |  | const`[virtual]`

Draw the legend item to a given rect.

Parameters:

  | painter | Painter
  | rect | Rect where to paint the button

void QwtLegendItem::drawText | ( | QPainter * | painter,
|  | const QRect & | textRect |
| ) |  |  | `[protected, virtual]`

Redraw the text.

Reimplemented from QwtTextLabel.

int QwtLegendItem::identifierMode | ( |  | ) | const

Or'd values of IdentifierMode.

See also:
  setIdentifierMode(), IdentifierMode

int QwtLegendItem::identifierWidth | ( |  | ) | const

Return the width of the identifier

See also:
  setIdentifierWidth()

bool QwtLegendItem::isChecked | ( |  | ) | const

Return true, if the item is checked.

bool QwtLegendItem::isDown | ( |  | ) | const`[protected]`

Return true, if the item is down.

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

Return the item mode

See also:
  setItemMode()

void QwtLegendItem::keyPressEvent | ( | QKeyEvent * | e | ) | `[protected, virtual]`

Handle key press events.

void QwtLegendItem::keyReleaseEvent | ( | QKeyEvent * | e | ) | `[protected, virtual]`

Handle key release events.

void QwtLegendItem::mousePressEvent | ( | QMouseEvent * | e | ) | `[protected, virtual]`

Handle mouse press events.

void QwtLegendItem::mouseReleaseEvent | ( | QMouseEvent * | e | ) | `[protected, virtual]`

Handle mouse release events.

void QwtLegendItem::paintEvent | ( | QPaintEvent * | e | ) | `[protected, virtual]`

Paint event.

Reimplemented from QwtTextLabel.

void QwtLegendItem::pressed | ( |  | ) | `[signal]`

Signal, when the legend item has been pressed.

void QwtLegendItem::released | ( |  | ) | `[signal]`

Signal, when the legend item has been relased.

void QwtLegendItem::setChecked | ( | bool | on | ) | `[slot]`

Check/Uncheck a the item

Parameters:

  | on | check/uncheck

See also:
  setItemMode()

void QwtLegendItem::setCurvePen | ( | const QPen & | pen | ) |

Set curve pen.

Parameters:

  | pen | Curve pen

See also:
  curvePen()

void QwtLegendItem::setDown | ( | bool | down | ) | `[protected]`

Set the item being down.

void QwtLegendItem::setIdentifierMode | ( | int | mode | ) |

Set identifier mode. Default is ShowLine | ShowText.

Parameters:

  | mode | Or'd values of IdentifierMode

See also:
  identifierMode()

void QwtLegendItem::setIdentifierWidth | ( | int | width | ) |

Set the width for the identifier Default is 8 pixels

Parameters:

  | width | New width

See also:
  identifierMode(), identifierWidth()

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

Set the item mode The default is QwtLegend::ReadOnlyItem

Parameters:

  | mode | Item mode

See also:
  itemMode()

void QwtLegendItem::setSpacing | ( | int | spacing | ) |

Change the spacing

Parameters:

  | spacing | Spacing

See also:
  spacing(), identifierWidth(), QwtTextLabel::margin()

void QwtLegendItem::setSymbol | ( | const QwtSymbol & | symbol | ) |

Set curve symbol.

Parameters:

  | symbol | Symbol

See also:
  symbol()

void QwtLegendItem::setText | ( | const QwtText & | text | ) | `[virtual]`

Set the text to the legend item

Parameters:

  | text | Text label

See also:
  QwtTextLabel::text()

Reimplemented from QwtTextLabel.

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

Return a size hint.

Reimplemented from QwtTextLabel.

int QwtLegendItem::spacing | ( |  | ) | const

Return the spacing

See also:
  setSpacing(), identifierWidth(), QwtTextLabel::margin()

const QwtSymbol & QwtLegendItem::symbol | ( |  | ) | const

Returns:
  The curve symbol.

See also:
  setSymbol()