imageitem.h

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#ifndef IMAGEITEM_H
#define IMAGEITEM_H
 
#include <QImage>
#include <QPainter>
#include <QQuickItem>
#include <QQuickPaintedItem>
 
class ImageItem : public QQuickPaintedItem
{
    Q_OBJECT
    Q_PROPERTY(QSize sourceSize READ sourceSize NOTIFY sourceSizeChanged)
    Q_PROPERTY(QSize boundsSize READ boundsSize WRITE setBoundsSize NOTIFY boundsSizeChanged)
    Q_PROPERTY(QImage sourceImage READ sourceImage NOTIFY sourceImageChanged)
 
public:
    explicit ImageItem(QQuickItem* parent = nullptr);
    void paint(QPainter* painter) override;
 
    QSize sourceSize();
    QSize boundsSize();
    QImage sourceImage();
 
    Q_INVOKABLE void setImage(const QImage& image);
    Q_INVOKABLE void saveSourceImage(const QString& url);
    Q_INVOKABLE void fitToBounds();
 
signals:
    void sourceSizeChanged();
    void boundsSizeChanged();
    void sourceImageChanged();
    void sizeChanged(QSizeF size);
 
public slots:
    void setBoundsSize(QSize newSize);
 
private:
    QImage m_qimage;
    QImage m_sourceImage;
    QSize m_sourceSize;
    QSize m_boundsSize;
    qreal m_currentScale = 1;
};
 
#endif // IMAGEITEM_H