MyCommonStyle.h

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#ifndef MYCOMMONSTYLE_H
#define MYCOMMONSTYLE_H
 
#include <QString>
#include <QStyle>
#include <QStyleOption>
 
class MyCommonStyleBase {
protected:
    bool x_styleHint(int *value, QStyle::StyleHint hint, const QStyleOption *option, const QWidget *widget, QStyleHintReturn *returnData) const;
    bool x_pixelMetric(int *value, QStyle::PixelMetric metric, const QStyleOption *option, const QWidget *widget) const;
    void x_sizeFromContents(QSize *value, QStyle::ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const;
public:
    static void drawFrame(QPainter *pr, int x, int y, int w, int h, QColor color_topleft, QColor color_bottomright);
    static void drawShadedFrame(QPainter *p, QRect const &rect, QPalette const &palette, QStyle::State state);
    static void drawFrame(QPainter *pr, const QRect &r, const QColor &color_topleft, const QColor &color_bottomright);
};
 
template <typename T> class MyCommonStyle : public MyCommonStyleBase, public T {
private:
    using Base = T;
public:
    MyCommonStyle() = default;
    ~MyCommonStyle() override = default;
    int styleHint(QStyle::StyleHint hint, const QStyleOption *option, const QWidget *widget = nullptr, QStyleHintReturn *returnData = nullptr) const override
    {
        int value;
        if (x_styleHint(&value, hint, option, widget, returnData)) {
            return value;
        }
        return Base::styleHint(hint, option, widget, returnData);
    }
    int pixelMetric(QStyle::PixelMetric metric, const QStyleOption *option, const QWidget *widget) const override
    {
        int value;
        if (x_pixelMetric(&value, metric, option, widget)) {
            return value;
        }
        return Base::pixelMetric(metric, option, widget);
    }
    QSize sizeFromContents(QStyle::ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const override
    {
        QSize value = Base::sizeFromContents(type, option, size, widget);
        x_sizeFromContents(&value, type, option, size, widget);
        return value;
    }
};
 
#endif // MYCOMMONSTYLE_H