qt-everywhere-src-5.15.1/qtdeclarative/src/quick/items/qquickloader_p.h

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#ifndef QQUICKLOADER_P_H
#define QQUICKLOADER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qquickimplicitsizeitem_p.h"

QT_BEGIN_NAMESPACE

class QQuickLoaderPrivate;
class Q_AUTOTEST_EXPORT QQuickLoader : public QQuickImplicitSizeItem
{
    Q_OBJECT

    Q_PROPERTY(bool active READ active WRITE setActive NOTIFY activeChanged)
    Q_PROPERTY(QUrl source READ source WRITE setSource NOTIFY sourceChanged)
    Q_PROPERTY(QQmlComponent *sourceComponent READ sourceComponent WRITE setSourceComponent RESET resetSourceComponent NOTIFY sourceComponentChanged)
    Q_PROPERTY(QObject *item READ item NOTIFY itemChanged)
    Q_PROPERTY(Status status READ status NOTIFY statusChanged)
    Q_PROPERTY(qreal progress READ progress NOTIFY progressChanged)
    Q_PROPERTY(bool asynchronous READ asynchronous WRITE setAsynchronous NOTIFY asynchronousChanged)
    QML_NAMED_ELEMENT(Loader)

public:
    QQuickLoader(QQuickItem *parent = nullptr);
    virtual ~QQuickLoader();

    bool active() const;
    void setActive(bool newVal);

    Q_INVOKABLE void setSource(QQmlV4Function *);

    QUrl source() const;
    void setSource(const QUrl &);

    QQmlComponent *sourceComponent() const;
    void setSourceComponent(QQmlComponent *);
    void resetSourceComponent();

    enum Status { Null, Ready, Loading, Error };
    Q_ENUM(Status)
    Status status() const;
    qreal progress() const;

    bool asynchronous() const;
    void setAsynchronous(bool a);

    QObject *item() const;

Q_SIGNALS:
    void itemChanged();
    void activeChanged();
    void sourceChanged();
    void sourceComponentChanged();
    void statusChanged();
    void progressChanged();
    void loaded();
    void asynchronousChanged();

protected:
    void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) override;
    void componentComplete() override;
    void itemChange(ItemChange change, const ItemChangeData &value) override;

private:
    void setSource(const QUrl &sourceUrl, bool needsClear);
    void loadFromSource();
    void loadFromSourceComponent();
    Q_DISABLE_COPY(QQuickLoader)
    Q_DECLARE_PRIVATE(QQuickLoader)
    Q_PRIVATE_SLOT(d_func(), void _q_sourceLoaded())
    Q_PRIVATE_SLOT(d_func(), void _q_updateSize())
};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QQuickLoader)

#endif // QQUICKLOADER_P_H