PreviewImageItem.hxx

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#ifndef PREVIEW_IMAGEITEM_HXX
#define PREVIEW_IMAGEITEM_HXX
 
#include <memory>
 
#include <QQuickItem>
#include <QUrl>
#include <QImage>
#include <QNetworkReply>
 
class QNetworkAccessManager;
 
class PreviewImageItem : public QQuickItem
{
    Q_OBJECT
 
    Q_PROPERTY(QUrl imageUrl READ imageUrl WRITE setImageUrl NOTIFY imageUrlChanged)
 
    Q_PROPERTY(QSize sourceSize READ sourceSize NOTIFY sourceSizeChanged)
 
    Q_PROPERTY(bool isLoading READ isLoading NOTIFY isLoadingChanged)
 
    Q_PROPERTY(float aspectRatio READ aspectRatio NOTIFY sourceSizeChanged)
public:
    PreviewImageItem(QQuickItem* parent = nullptr);
    ~PreviewImageItem();
 
    QSGNode* updatePaintNode(QSGNode *, UpdatePaintNodeData *) override;
 
    QUrl imageUrl() const;
 
    QSize sourceSize() const;
 
    static void setGlobalNetworkAccess(QNetworkAccessManager* netAccess);
 
    bool isLoading() const;
 
    float aspectRatio() const;

    Q_INVOKABLE void clear();
signals:
    void imageUrlChanged();
    void sourceSizeChanged();
    void isLoadingChanged();
 
public slots:
 
    void setImageUrl(QUrl url);
 
private slots:
    void onDownloadError(QNetworkReply::NetworkError errorCode);
 
    void onFinished();
private:
    void setImage(QImage image);
    void startDownload();
 
    QUrl m_imageUrl;
 
    bool m_imageDirty = false;
    QImage m_image;
    unsigned int m_downloadRetryCount = 0;
    bool m_requestActive = false;
};
 
#endif // PREVIEW_IMAGEITEM_HXX