Function start_dnd

pub fn start_dnd<T: 'static, R: 'static>(
    clipboard: &mut dyn Clipboard,
    internal: bool,
    source_surface: Option<DndSource>,
    icon_surface: Option<IconSurface<Element<'static, (), T, R>>>,
    content: Box<dyn AsMimeTypes + Send + 'static>,
    actions: DndAction,
)

Starts a DnD operation. icon surface is a tuple of the icon element and optionally the icon element state.