QwtLegendData man page
QwtLegendData — Attributes of an entry on a legend.
Synopsis
#include <qwt_legend_data.h>
Public Types
enum Mode { ReadOnly, Clickable, Checkable } Mode defining how a legend entry interacts. "
enum Role { ModeRole, TitleRole, IconRole, UserRole = 32 } Identifier how to interprete a QVariant. "
Public Member Functions
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
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
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
bool QwtLegendData::hasRole (int role) const
- Parameters:
role Attribute role
- Returns:
True, when the internal map has an entry for role
QwtGraphic QwtLegendData::icon () const
- Returns:
Value of the IconRole attribute
bool QwtLegendData::isValid () const
- Returns:
True, when the internal map is empty
QwtLegendData::Mode QwtLegendData::mode () const
- Returns:
Value of the ModeRole attribute
void QwtLegendData::setValue (int role, const QVariant & data)
Set an attribute value
- Parameters:
role Attribute role
data Attribute value- See also:
value()
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()
QwtText QwtLegendData::title () const
- Returns:
Value of the TitleRole attribute
QVariant QwtLegendData::value (int role) const
- Parameters:
role Attribute role
- Returns:
Attribute value for a specific role
const QMap< int, QVariant > & QwtLegendData::values () const
- Returns:
Legend attributes
- See also:
setValues()
Author
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