qwt_legend_data.h

/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_LEGEND_DATA_H
#define QWT_LEGEND_DATA_H
 
#include "qwt_global.h"
 
#include <qvariant.h>
#include <qmap.h>
 
class QwtText;
class QwtGraphic;
 
class QWT_EXPORT QwtLegendData
{
public:
    enum Mode
    {
        ReadOnly,
 
        Clickable,
 
        Checkable
    };
 
    enum Role
    {
        ModeRole,
 
        TitleRole,
 
        IconRole,
 
        UserRole = 32
    };
 
    // Constructor
    QwtLegendData();
    // Copy constructor
    QwtLegendData(const QwtLegendData&);
    // Move constructor
    QwtLegendData(QwtLegendData&&) noexcept = default;
    // Destructor
    ~QwtLegendData();
    // Copy assignment
    QwtLegendData& operator=(const QwtLegendData&);
    // Move assignment
    QwtLegendData& operator=(QwtLegendData&&) noexcept = default;
 
    // Set all values
    void setValues(const QMap< int, QVariant >&);
    // Return all values
    const QMap< int, QVariant >& values() const;
 
    // Set a value for a specific role
    void setValue(int role, const QVariant&);
    // Return the value for a specific role
    QVariant value(int role) const;
 
    // Check if a value exists for a specific role
    bool hasRole(int role) const;
    // Check if the legend data is valid
    bool isValid() const;
 
    // Return the icon
    QwtGraphic icon() const;
    // Return the title
    QwtText title() const;
    // Return the mode
    Mode mode() const;
 
private:
    QMap< int, QVariant > m_map;
};
 
#endif