system_theme_detector.h

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#ifndef SYSTEM_THEME_DETECTOR_H
#define SYSTEM_THEME_DETECTOR_H
 
#include <QObject>
#include <QScopedPointer>

class SystemThemeDetector : public QObject
{
    Q_OBJECT
public:
    enum class Scheme {
        Unknown,    
        Light,
        Dark,
        Invalid     
    };
    Q_ENUM(Scheme)
 
    explicit SystemThemeDetector(QObject *parent = nullptr);
    ~SystemThemeDetector();

    Scheme currentScheme() const;

    static bool calibrateDefaultIsDark();

    static Scheme resolveDefault(Scheme s, bool defaultIsDark);
 
signals:
    void schemeChanged(Scheme scheme);
 
private:
    struct Impl;
    QScopedPointer<Impl> impl_;
};
 
#endif /* SYSTEM_THEME_DETECTOR_H */