view.h

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** This file is part of the Qt Charts module of the Qt Toolkit.
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#pragma once

#include <QChartView>
#include <QtCharts/QChartGlobal>
#include <QtWidgets/QGraphicsView>

using namespace Qt::Literals;


class QGraphicsScene;
class QMouseEvent;
class QResizeEvent;


class QChart;

class Callout;

class ChartView final : public QChartView {
    Q_OBJECT

public:
    ChartView(QWidget* parent = 0);
    void setData(const QPolygonF& data);
    void setData2(const QPolygonF& data);
    void setDeltaData(const QPolygonF& data);
    void setPrec(int prec);

protected:
    void resizeEvent(QResizeEvent* event) override;
    void mouseMoveEvent(QMouseEvent* event) override;
    void wheelEvent(QWheelEvent* event) override;
    void mouseDoubleClickEvent(QMouseEvent* event) override;

    //    void mousePressEvent(QMouseEvent* event) override;
    //    void mouseReleaseEvent(QMouseEvent* event) override;

public slots:
    void keepCallout();
    void tooltip(QPointF point, bool state);

private:
    QGraphicsSimpleTextItem* coordX_{};
    QGraphicsSimpleTextItem* coordY_{};
    Callout* tooltip_{};
    QList<Callout*> callouts_;
    QPointF pos_;
    struct minMax {
        double min = +std::numeric_limits<double>::max();
        double max = -std::numeric_limits<double>::max();
        auto operator|=(minMax r) {
            min = std::min(min, r.min);
            max = std::max(max, r.max);
            return *this;
        }
    } mmx1, mmy1, mmx2, mmy2;
};