CssQmlUnitConverter.h

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/*
 *  SPDX-FileCopyrightText: 2025 Wolthera van Hövell tot Westerflier <griffinvalley@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
#ifndef CSSQMLUNITCONVERTER_H
#define CSSQMLUNITCONVERTER_H
 
#include <QObject>
#include <QVariant>
 
class KoSvgTextPropertiesModel;
class CssQmlUnitConverter : public QObject
{
    Q_OBJECT
 
    Q_PROPERTY(qreal dpi READ dpi WRITE setDpi NOTIFY dpiChanged)
 
    
    Q_PROPERTY(qreal dataMultiplier READ dataMultiplier WRITE setDataMultiplier NOTIFY dataMultiplierChanged)
 
    Q_PROPERTY(qreal dataValue READ dataValue WRITE setDataValue NOTIFY dataValueChanged)
    Q_PROPERTY(int dataUnit READ dataUnit WRITE setDataUnit NOTIFY dataUnitChanged)
 
    Q_PROPERTY(qreal userValue READ userValue WRITE setUserValue NOTIFY userValueChanged)
    Q_PROPERTY(int userUnit READ userUnit WRITE setUserUnit NOTIFY userUnitChanged)
 
    Q_PROPERTY(QVariantList userUnitModel READ userUnitModel NOTIFY userUnitModelChanged)
 
    Q_PROPERTY(QString symbol READ symbol NOTIFY userUnitChanged)
 
    Q_PROPERTY(qreal percentageReference READ percentageReference WRITE setPercentageReference NOTIFY percentageReferenceChanged)
 
public:
    CssQmlUnitConverter(QObject *parent = nullptr);
 
    ~CssQmlUnitConverter();
 
    enum UserUnits {
        Px, 
        Pt, 
        Mm, 
        Cm, 
        Inch,
        //
        Percentage,
        // Font Relative
        Em, 
        Ex, 
        Cap,
        Ch, 
        Ic, 
        Lh, 
        // unique for certain properties
        Lines,  
        Spaces, 
    };
 
    Q_ENUM(UserUnits)
 
    
    Q_INVOKABLE void setDataUnitMap(const QVariantList &unitMap);
 
    Q_INVOKABLE void setFontMetricsFromTextPropertiesModel(KoSvgTextPropertiesModel *textPropertiesModel, bool isFontSize = false, bool isLineHeight = false);
 
    Q_INVOKABLE void setFromNormalLineHeight();
 
    Q_INVOKABLE void setDataValueAndUnit(const qreal value, const int unit);
 
    qreal dpi() const;
    void setDpi(qreal newDpi);
 
    qreal dataMultiplier() const;
    void setDataMultiplier(qreal newDataMultiplier);
 
    qreal dataValue() const;
    void setDataValue(qreal newDataValue);
 
    int dataUnit() const;
    void setDataUnit(int newDataUnit);
 
    qreal userValue() const;
    void setUserValue(qreal newUserValue);
 
    int userUnit() const;
    void setUserUnit(int newUserUnit);
 
    QVariantList userUnitModel() const;
 
    QString symbol() const;
 
    qreal percentageReference() const;
    void setPercentageReference(qreal newPercentageReference);
 
Q_SIGNALS:
 
    void dpiChanged();
    void dataMultiplierChanged();
 
    void dataValueChanged();
 
    void dataUnitChanged();
 
    void userValueChanged();
 
    void userUnitChanged();
 
    void userUnitModelChanged();
 
    void percentageReferenceChanged();
 
private:
    // Converts from a relative value (font or percentage) to pt.
    qreal convertFromRelativeValue(const qreal value, const UserUnits type) const;
    // Converts from pt to the given relative value (font or percentage).
    qreal convertToRelativeValue(const qreal value, const UserUnits type)const ;
 
    struct Private;
    const QScopedPointer<Private> d;
};
 
#endif // CSSQMLUNITCONVERTER_H