mainwidget.h Example File

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#ifndef MAINWIDGET_H
#define MAINWIDGET_H

#include <QtCharts/QChartGlobal>
#include <QtCharts/QChart>
#include <QtCharts/QChartView>
#include <QtWidgets/QWidget>
#include <QtWidgets/QGraphicsWidget>
#include <QtWidgets/QGridLayout>
#include <QtWidgets/QGraphicsGridLayout>
#include <QtWidgets/QDoubleSpinBox>
#include <QtWidgets/QGroupBox>
#include <QtCharts/QBarSeries>

QT_CHARTS_USE_NAMESPACE

class MainWidget : public QWidget
{
    Q_OBJECT
public:
    explicit MainWidget(QWidget *parent = 0);
    void createSeries();
    void showLegendSpinbox();
    void hideLegendSpinbox();

public Q_SLOTS:
    void toggleAttached();
    void addBarset();
    void removeBarset();

    void setLegendAlignment();

    void toggleBold();
    void toggleItalic();
    void fontSizeChanged();

    void updateLegendLayout();

private:
    QChart *m_chart;
    QBarSeries *m_series;

    QChartView *m_chartView;
    QGridLayout *m_mainLayout;
    QGridLayout *m_buttonLayout;
    QGridLayout *m_fontLayout;

    QDoubleSpinBox *m_fontSize;

    // For detached layout
    QGroupBox *m_legendSettings;
    QDoubleSpinBox *m_legendPosX;
    QDoubleSpinBox *m_legendPosY;
    QDoubleSpinBox *m_legendWidth;
    QDoubleSpinBox *m_legendHeight;
};

#endif // MAINWIDGET_H