GObject
    ├── ApertureCamera
    ├── ApertureDeviceManager
    ╰── GInitiallyUnowned
        ╰── GtkWidget
            ╰── GtkContainer
                ╰── GtkBin
                    ╰── ApertureViewfinder
    GEnum
    ├── ApertureBarcode
    ├── ApertureMediaCaptureError
    ╰── ApertureViewfinderState