QwtLegendData(3) Qwt User's Guide QwtLegendData(3)

QwtLegendData - Attributes of an entry on a legend.

#include <qwt_legend_data.h>


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


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

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 36 of file qwt_legend_data.h.

Mode defining how a legend entry interacts.

Enumerator

The legend item is not interactive, like a label.
The legend item is clickable, like a push button.
The legend item is checkable, like a checkable button.

Definition at line 40 of file qwt_legend_data.h.

Parameters

role Attribute role

Returns

True, when the internal map has an entry for role

Definition at line 51 of file qwt_legend_data.cpp.

QwtGraphic QwtLegendData::icon () const

Returns

Value of the IconRole attribute

Definition at line 106 of file qwt_legend_data.cpp.

Returns

True, when the internal map is empty

Definition at line 82 of file qwt_legend_data.cpp.

QwtLegendData::Mode QwtLegendData::mode () const

Returns

Value of the ModeRole attribute

Definition at line 120 of file qwt_legend_data.cpp.

Set an attribute value

Parameters

role Attribute role
data Attribute value

See also

value()

Definition at line 64 of file qwt_legend_data.cpp.

Set the legend attributes

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

Parameters

map Values

See also

values()

Definition at line 33 of file qwt_legend_data.cpp.

QwtText QwtLegendData::title () const

Returns

Value of the TitleRole attribute

Definition at line 88 of file qwt_legend_data.cpp.

Parameters

role Attribute role

Returns

Attribute value for a specific role

Definition at line 73 of file qwt_legend_data.cpp.

Returns

Legend attributes

See also

setValues()

Definition at line 42 of file qwt_legend_data.cpp.

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Sun Jul 18 2021 Version 6.2.0