Method insertItemAt

listbox.go:208–216

insert one item from list model

(index int)

//insert one item from list model
func (lb *ListBox) insertItemAt(index int) error {
	str := lb.itemString(index)
	lp := uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(str)))
	ret := int(lb.SendMessage(win.LB_INSERTSTRING, uintptr(index), lp))
	if ret == win.LB_ERRSPACE || ret == win.LB_ERR {
		return newError("SendMessage(LB_INSERTSTRING)")
	}
	return nil
}

func (lb *ListBox) removeItem(index int) error {
	if win.LB_ERR == int(lb.SendMessage(win.LB_DELETESTRING, uintptr(index), 0)) {