func (sv *ScrollView) updateScrollBars() { s := sv.composite.Size() clb := sv.ClientBounds() var si win.SCROLLINFO si.CbSize = uint32(unsafe.Sizeof(si)) si.FMask = win.SIF_PAGE | win.SIF_RANGE si.NMax = int32(s.Width - 1) si.NPage = uint32(clb.Width) win.SetScrollInfo(sv.hWnd, win.SB_HORZ, &si, false) sv.composite.SetX(sv.scroll(win.SB_HORZ, win.SB_THUMBPOSITION)) si.NMax = int32(s.Height - 1) si.NPage = uint32(clb.Height) win.SetScrollInfo(sv.hWnd, win.SB_VERT, &si, false) sv.composite.SetY(sv.scroll(win.SB_VERT, win.SB_THUMBPOSITION)) }