color_preview.hpp

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#ifndef COLOR_PREVIEW_HPP
#define COLOR_PREVIEW_HPP

#include <QWidget>

namespace color_widgets {

class  ColorPreview : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged DESIGNABLE true)
    Q_PROPERTY(QColor comparisonColor READ comparisonColor WRITE setComparisonColor DESIGNABLE true)
    Q_PROPERTY(DisplayMode display_mode READ displayMode WRITE setDisplayMode DESIGNABLE true)
    Q_PROPERTY(QBrush background READ background WRITE setBackground DESIGNABLE true)
    Q_ENUMS(DisplayMode)
public:
    enum DisplayMode
    {
        NoAlpha,    
        AllAlpha,   
        SplitAlpha, 
        SplitColor  
    };

    explicit ColorPreview(QWidget *parent = 0);
    ~ColorPreview();

    QBrush background() const;

    void setBackground(const QBrush &bk);

    DisplayMode displayMode() const;

    void setDisplayMode(DisplayMode dm);

    QColor color() const;

    QColor comparisonColor() const;

    QSize sizeHint () const;

    void paint(QPainter &painter, QRect rect) const;
    
public slots:
    void setColor(const QColor &c);

    void setComparisonColor(const QColor &c);

signals:
    void clicked();

    void colorChanged(QColor);

protected:
    void paintEvent(QPaintEvent *);
    void resizeEvent(QResizeEvent *);
    void mouseReleaseEvent(QMouseEvent *ev);
    void mouseMoveEvent(QMouseEvent *ev);

private:
    class Private;
    Private * const p;
};

} // namespace color_widgets

#endif // COLOR_PREVIEW_HPP