theme_styler.h

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#ifndef THEME_STYLER_H
#define THEME_STYLER_H
 
#include <QProxyStyle>
 
class QStyleOptionButton;
#ifdef Q_OS_MACOS
namespace NativePushButton { struct BezelState; }
#endif
 
class ThemeStyler : public QProxyStyle {
    Q_OBJECT
public:
    ThemeStyler(QStyle *style = nullptr);
    ThemeStyler(const QString &key);
 
    int styleHint(StyleHint hint, const QStyleOption *option = nullptr,
        const QWidget *widget = nullptr, QStyleHintReturn *returnData = nullptr) const override;

    int pixelMetric(PixelMetric metric, const QStyleOption *option = nullptr,
        const QWidget *widget = nullptr) const override;

    QSize sizeFromContents(ContentsType type, const QStyleOption *option,
        const QSize &contentsSize, const QWidget *widget = nullptr) const override;

    void drawPrimitive(PrimitiveElement element, const QStyleOption *option,
        QPainter *painter, const QWidget *widget = nullptr) const override;
 
    using QProxyStyle::polish;
    using QProxyStyle::unpolish;

    void drawControl(ControlElement element, const QStyleOption *option,
        QPainter *painter, const QWidget *widget = nullptr) const override;

    void polish(QWidget *widget) override;

    void unpolish(QWidget *widget) override;
 
    // The object name of the underlying (native) style, e.g. "windows11",
    // "windowsvista", "fusion", or "macos". QApplication::style() returns
    // either this proxy or a QStyleSheetStyle wrapping it, neither of which
    // has a useful objectName().
    static QString baseStyleName();

    static QString buttonStyleSheet(const QString &objectname, const QColor &baseColor);
 
protected:
    bool eventFilter(QObject *watched, QEvent *event) override;
 
private:
    // Nesting depth of pixelMetric() calls. Styles run on the GUI thread
    // only, so a plain counter is enough.
    mutable int metric_depth_ = 0;
 
#ifdef Q_OS_MACOS
    int pushButtonBezelHeight(const QStyleOptionButton *button, int contentsWidth,
        const QWidget *widget) const;

    bool takesFlexibleBezel(const QStyleOptionButton *button, const QWidget *widget) const;

    static bool pushButtonEmphasized(const QStyleOptionButton *button);

    static NativePushButton::BezelState flexibleBezelState(const QStyleOptionButton *button);

    QRect flexibleBezelRect(const QStyleOptionButton *button, const QWidget *widget) const;
#endif
};
 
 
#endif /* THEME_STYLER_H */