QwtLegendData Class Reference

Attributes of an entry on a legend. More...

#include <qwt_legend_data.h>

Public Types
enum	Mode { ReadOnly , Clickable , Checkable }
	Mode defining how a legend entry interacts. More...
enum	Role { ModeRole , TitleRole , IconRole , UserRole = 32 }
	Identifier how to interpret a QVariant.

Public Member Functions
	QwtLegendData ()
	Constructor.
	~QwtLegendData ()
	Destructor.
void	setValues (const QMap< int, QVariant > &)
	Set the legend attributes.
const QMap< int, QVariant > &	values () const
void	setValue (int role, const QVariant &)
	Set an attribute value.
QVariant	value (int role) const
bool	hasRole (int role) const
bool	isValid () const
QwtGraphic	icon () const
QwtText	title () const
Mode	mode () const

Detailed Description

Attributes of an entry on a legend.

QwtLegendData is an abstract container ( like QAbstractModel ) to exchange attributes, that are only known between to the plot item and the legend.

By overloading QwtPlotItem::legendData() any other set of attributes could be used, that can be handled by a modified ( or completely different ) implementation of a legend.

See also

QwtLegend, QwtPlotLegendItem

Note

The stockchart example implements a legend as a tree with checkable items

Member Enumeration Documentation

Mode

enum QwtLegendData::Mode

Mode defining how a legend entry interacts.

Enumerator
ReadOnly	The legend item is not interactive, like a label.
Clickable	The legend item is clickable, like a push button.
Checkable	The legend item is checkable, like a checkable button.

Member Function Documentation

hasRole()

bool QwtLegendData::hasRole

(

int

role

)

const

Parameters

role	Attribute role

Returns

True, when the internal map has an entry for role

icon()

QwtGraphic QwtLegendData::icon

(

)

const

Returns

Value of the IconRole attribute

isValid()

bool QwtLegendData::isValid

(

)

const

Returns

True, when the internal map is empty

mode()

QwtLegendData::Mode QwtLegendData::mode

(

)

const

Returns

Value of the ModeRole attribute

setValue()

void QwtLegendData::setValue	(	int	role,
		const QVariant &	data
	)

Set an attribute value.

Parameters

role	Attribute role
data	Attribute value

See also

value()

setValues()

void QwtLegendData::setValues

(

const QMap< int, QVariant > &

map

)

Set the legend attributes.

QwtLegendData actually is a QMap<int, QVariant> with some convenience interfaces

Parameters

map

Values

See also

values()

title()

QwtText QwtLegendData::title

(

)

const

Returns

Value of the TitleRole attribute

value()

QVariant QwtLegendData::value

(

int

role

)

const

Parameters

role	Attribute role

Returns

Attribute value for a specific role

values()

const QMap< int, QVariant > & QwtLegendData::values

(

)

const

Returns

Legend attributes

See also

setValues()

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The documentation for this class was generated from the following files:

• /home/runner/work/QWT/QWT/src/qwt_legend_data.h
• /home/runner/work/QWT/QWT/src/qwt_legend_data.cpp