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 interprete a QVariant. More...

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

Private Attributes
QMap< int, QVariant >	d_map

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

Definition at line 35 of file qwt_legend_data.h.

Member Enumeration Documentation

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.

Definition at line 39 of file qwt_legend_data.h.

enum QwtLegendData::Role

Identifier how to interprete a QVariant.

Enumerator
ModeRole
TitleRole
IconRole
UserRole

Definition at line 52 of file qwt_legend_data.h.

Constructor & Destructor Documentation

QwtLegendData::QwtLegendData

(

)

Constructor.

Definition at line 13 of file qwt_legend_data.cpp.

QwtLegendData::~QwtLegendData

(

)

Destructor.

Definition at line 18 of file qwt_legend_data.cpp.

Member Function Documentation

bool QwtLegendData::hasRole

(

int

role

)

const

Parameters

role	Attribute role

Returns

True, when the internal map has an entry for role

Definition at line 49 of file qwt_legend_data.cpp.

QwtGraphic QwtLegendData::icon

(

)

const

Returns

Value of the IconRole attribute

Definition at line 104 of file qwt_legend_data.cpp.

bool QwtLegendData::isValid

(

)

const

Returns

True, when the internal map is empty

Definition at line 80 of file qwt_legend_data.cpp.

QwtLegendData::Mode QwtLegendData::mode

(

)

const

Returns

Value of the ModeRole attribute

Definition at line 118 of file qwt_legend_data.cpp.

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

Set an attribute value

Parameters

role	Attribute role
data	Attribute value

See also

value()

Definition at line 62 of file qwt_legend_data.cpp.

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()

Definition at line 31 of file qwt_legend_data.cpp.

QwtText QwtLegendData::title

(

)

const

Returns

Value of the TitleRole attribute

Definition at line 86 of file qwt_legend_data.cpp.

QVariant QwtLegendData::value

(

int

role

)

const

Parameters

role	Attribute role

Returns

Attribute value for a specific role

Definition at line 71 of file qwt_legend_data.cpp.

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

(

)

const

Returns

Legend attributes

See also

setValues()

Definition at line 40 of file qwt_legend_data.cpp.

Member Data Documentation

QMap<int, QVariant> QwtLegendData::d_map

private

Definition at line 84 of file qwt_legend_data.h.

---

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

• qwt_legend_data.h
• qwt_legend_data.cpp