# ui_anim.ludic — CSS animation and transition on ludic.ui's frame clock (sixty frames a second
# when the renderer gives no clock of its own): a fade-in from @keyframes, a pulse that loops back
# and forth, and a transition easing an opacity that changed.
import "ludic.ui"
program UiAnim {
  numbers float
  state UiAnimState {
    dim: bool = false
  }
  view Anim (ui_anim_st: UiAnimState) {
    dim = ui_anim_st.dim
  }
  const PAGE: string = "<ui><style>@keyframes fade { from { opacity: 0 } to { opacity: 1 } }\n@keyframes pulse { from { opacity: 1 } to { opacity: 0.5 } }\n.in { animation: fade 1s }\n.beat { animation: pulse 0.5s infinite alternate }\n.soft { transition: opacity 1s }\n.dim { opacity: 0.2 }</style><screen name='a'><p class='in'>a</p><p class='beat'>b</p><p class=\"soft {dim ? 'dim' : ''}\">c</p></screen></ui>"
  function at(ui_st: mut UiState) -> string {
    ui_show(ui_st, "a", view_anim(), 0.0, 0.0, 200.0, 200.0)
    let r: UiNode = ui_nodes(ui_st, "a", view_anim())
    return `{int(r.children[0].alpha * 100.0)} {int(r.children[1].alpha * 100.0)} {int(r.children[2].alpha * 100.0)}`
  }
  entry (ui_anim_st: mut UiAnimState, ui_st: mut UiState) {
    ui_load_text(ui_st, PAGE, "a.xml")
    var out = at(ui_st)
    for i in 0 .. 29 { at(ui_st) }
    out = out + " | " + at(ui_st)
    ui_anim_st.dim = true
    for i in 0 .. 29 { at(ui_st) }
    out = out + " | " + at(ui_st)
    print(out)
  }
}