func (sv *ScrollView) scroll(sb int32, cmd uint16) int { var pos int32 var si win.SCROLLINFO si.CbSize = uint32(unsafe.Sizeof(si)) si.FMask = win.SIF_PAGE | win.SIF_POS | win.SIF_RANGE | win.SIF_TRACKPOS win.GetScrollInfo(sv.hWnd, sb, &si) pos = si.NPos switch cmd { case win.SB_LINELEFT: // == win.SB_LINEUP pos -= 20 case win.SB_LINERIGHT: // == win.SB_LINEDOWN pos += 20 case win.SB_PAGELEFT: // == win.SB_PAGEUP pos -= int32(si.NPage) case win.SB_PAGERIGHT: // == win.SB_PAGEDOWN pos += int32(si.NPage) case win.SB_THUMBTRACK: pos = si.NTrackPos } if pos < 0 { pos = 0 } if pos > si.NMax+1-int32(si.NPage) { pos = si.NMax + 1 - int32(si.NPage) } si.FMask = win.SIF_POS si.NPos = pos win.SetScrollInfo(sv.hWnd, sb, &si, true) return -int(pos) }