native_title_bar.h

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#ifndef NATIVE_TITLE_BAR_H
#define NATIVE_TITLE_BAR_H
 
#include <QColor>
#include <QObject>
 
class QEvent;
class QWidget;

class NativeTitleBar : public QObject
{
    Q_OBJECT
public:
    struct Style {
        QColor background;          
        QColor text;                
        bool darkBackground = false; 
        bool appDark = false;       
    };

    explicit NativeTitleBar(QObject *parent = nullptr);

    void applyToAll();

    static Style previewStyle(bool declaresWindow, const QColor &window, const QColor &windowText);
 
protected:
    bool eventFilter(QObject *watched, QEvent *event) override;
 
private:
    static Style currentStyle();

    static Style styleFor(bool tinted, const QColor &window, const QColor &windowText);

    static bool isSupported();
    static bool hasTitleBar(const QWidget *widget);
    static void applyTo(QWidget *window, const Style &style);
    static bool applyAndMark(QWidget *window, const Style &style);

    static bool applyNative(QWidget *window, const Style &style);
};
 
#endif /* NATIVE_TITLE_BAR_H */