QwtLegendData(3)

💅 QwtLegendData(3) — Library Functions Manual ✨

okay bestie, welcome to the Library Functions Manual era of your life 🎀 this is QwtLegendData, and it's lowkey iconic.

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🌸 NAME 🌸

QwtLegendData — literally the attributes of an entry on a legend. that's the whole vibe.

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✨ SYNOPSIS ✨

#include <qwt_legend_data.h>

🫶 Public Types

• enum Mode { ReadOnly, Clickable, Checkable } — the Mode that defines how a legend entry interacts with you 👀
• enum Role { ModeRole, TitleRole, IconRole, UserRole = 32 } — the identifier for 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

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💜 Detailed Description 💜

Attributes of an entry on a legend. main character behavior fr.

QwtLegendData is an abstract container ( like QAbstractModel ) whose whole job is exchanging attributes — and those attributes are only known between the plot item and the legend. like, it's the group chat between them 🫶

and here's the slay part: by overloading QwtPlotItem::legendData() you can use any other set of attributes, as long as a modified ( or completely different ) implementation of a legend can handle them. customization queen 👑

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.

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🎀 Member Enumeration Documentation 🎀

enum QwtLegendData::Mode

Mode defining how a legend entry interacts. periodt.

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.

enum QwtLegendData::Role

Identifier how to interpret a QVariant 🧚

Definition at line 53 of file qwt_legend_data.h.

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🌈 Constructor & Destructor Documentation 🌈

QwtLegendData::QwtLegendData ()

Constructor. she's born 💖

Definition at line 15 of file qwt_legend_data.cpp.

QwtLegendData::~QwtLegendData ()

Destructor. she's gone 😭

Definition at line 20 of file qwt_legend_data.cpp.

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⭐ 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 (yep, that's what it says, no cap) 💀

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.

plot twist 🫢 QwtLegendData actually is a QMap<int, QVariant> with some convenience interfaces. she's not like a map, she is the map.

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.

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👑 Author 👑

Generated automatically by Doxygen for Qwt User's Guide from the source code.

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