Function PrivateData

dgl/src/ImageBaseWidgets.cpp:119–123

    ImageType imageDown;

    PrivateData(const ImageType& normal, const ImageType& hover, const ImageType& down)
        : callback(nullptr),
          imageNormal(normal),
          imageHover(hover),
          imageDown(down) {}

    void buttonClicked(SubWidget* widget, int button) override
    {