QwtLegendData类 参考

Attributes of an entry on a legend 更多...

#include <qwt_legend_data.h>

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

Public 成员函数
	QwtLegendData ()
	Constructor
	QwtLegendData (const QwtLegendData &)
	Copy constructor
	QwtLegendData (QwtLegendData &&) noexcept=default
	~QwtLegendData ()
	Destructor
QwtLegendData &	operator= (const QwtLegendData &)
	Copy assignment
QwtLegendData &	operator= (QwtLegendData &&) noexcept=default
void	setValues (const QMap< int, QVariant > &)
	Set the legend attributes
const QMap< int, QVariant > &	values () const
	Return the legend attributes
void	setValue (int role, const QVariant &)
	Set an attribute value
QVariant	value (int role) const
	Return the attribute value for a specific role
bool	hasRole (int role) const
	Check if a value exists for a specific role
bool	isValid () const
	Check if the legend data is valid
QwtGraphic	icon () const
	Return the icon
QwtText	title () const
	Return the title
Mode	mode () const
	Return the mode

详细描述

Attributes of an entry on a legend

QwtLegendData is an abstract container (like QAbstractModel) to exchange attributes that are only known between 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.

参见

QwtLegend, QwtPlotLegendItem

注解

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

成员枚举类型说明

Mode

enum QwtLegendData::Mode

Mode defining how a legend entry interacts

枚举值
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

Role

enum QwtLegendData::Role

Identifier how to interpret a QVariant

枚举值
ModeRole	The value is a Mode
TitleRole	The value is a title
IconRole	The value is an icon
UserRole	Values < UserRole are reserved for internal use

成员函数说明

hasRole()

bool QwtLegendData::hasRole

(

int

role

)

const

Check if a value exists for a specific role

参数

role	Attribute role

返回

True, when the internal map has an entry for role

参见

setValue(), value()

icon()

QwtGraphic QwtLegendData::icon

(

)

const

Return the icon

返回

Value of the IconRole attribute

参见

title(), mode()

isValid()

bool QwtLegendData::isValid

(

)

const

Check if the legend data is valid

返回

True, when the internal map is empty

参见

setValues(), setValue()

mode()

QwtLegendData::Mode QwtLegendData::mode

(

)

const

Return the mode

返回

Value of the ModeRole attribute

ReadOnly when no mode is set

参见

title(), icon()

setValue()

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

Set an attribute value

参数

role	Attribute role
data	Attribute value

参见

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

参数

map

Values

参见

values()

title()

QwtText QwtLegendData::title

(

)

const

Return the title

返回

Value of the TitleRole attribute

参见

icon(), mode()

value()

QVariant QwtLegendData::value

(

int

role

)

const

Return the attribute value for a specific role

参数

role	Attribute role

返回

Attribute value for a specific role

参见

setValue()

values()

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

(

)

const

Return the legend attributes

返回

Legend attributes

参见

setValues()

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该类的文档由以下文件生成:

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