# tooltip_text.ludic - a title in the program's language (whole when the translator knows it whole,
# else line by line, and not inside translate="no"), and a title for the keyboard's focus
# the focused element, when the keyboard put the focus there and it has a title; else null
function tt_focused(ui_st: mut UiState, scope: UiNode, x: float, y: float) -> UiNode {
  if ui_st.in_last.x != x or ui_st.in_last.y != y { ui_st.tt_by_keys = false }
  if ui_st.fc_visible and ui_st.fc_key != "" and ui_st.fc_key != ui_st.tt_focus_seen { ui_st.tt_by_keys = true }
  ui_st.tt_focus_seen = ui_st.fc_key
  if not ui_st.tt_by_keys or not ui_st.fc_visible { return null }
  let n = fr_node(scope, ui_st.fc_key)
  if n == null or n.akeys == null or ui_attr_text(n, "title") == "" { return null }
  return n
}
@alloc_ok("on a title's change: tt_track keeps what it made")
function tt_translate(ui_st: mut UiState, n: UiNode, s: string) -> string {
  var at = n
  while at != null {
    let say = ui_attr_text(at, "translate")
    if say == "no" { return s }
    if say == "yes" { break }
    at = at.parent
  }
  let whole = ui_tr(ui_st, s)
  if whole != s { return whole }
  let lines = tt_lines(ui_st, s)
  if len(lines) < 2 { return whole }
  var out = ui_tr(ui_st, lines[0])
  for i in 1 .. len(lines) { out = out + "\n" + ui_tr(ui_st, lines[i]) }
  return out
}