QwtLegendData - Man Page
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 interpret 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
Definition at line 36 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 40 of file qwt_legend_data.h.
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 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.
bool QwtLegendData::isValid () const
- 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.
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 64 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 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.
QVariant QwtLegendData::value (int role) const
- Parameters
role Attribute role
- Returns
Attribute value for a specific role
Definition at line 73 of file qwt_legend_data.cpp.
const QMap< int, QVariant > & QwtLegendData::values () const
- Returns
Legend attributes
- See also
setValues()
Definition at line 42 of file qwt_legend_data.cpp.
Author
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