Function fltk_sys::tree::Fl_Tree_Item_draw_item_content

pub unsafe extern "C" fn Fl_Tree_Item_draw_item_content(
    item: *mut Fl_Tree_Item,
    cb: Option<unsafe extern "C" fn(self_: *mut Fl_Tree_Item, arg1: c_int, arg2: *mut c_void) -> c_int>,
    data: *mut c_void
)