src/main/scala/reading/utils/Rx.scala


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package reading.utils

import scala.util.{ Failure, Success }

import org.scalajs.dom.Element

import scalatags.JsDom.all._
import rx._

import Ctx.Owner.Unsafe._

object RxTag {
  def apply(r: Ctx.Data => HtmlTag): HtmlTag =
    rxMod(Rx(r(implicitly[Ctx.Data])))

  private def rxMod(r: Rx[HtmlTag]): HtmlTag = {
    def rSafe = r.toTry match {
      case Success(v) => v.render
      case Failure(e) => span(e.toString, backgroundColor := "red").render
    }
    var last = rSafe
    r.trigger {
      val newLast = rSafe
      Option(last.parentElement).foreach {
        _.replaceChild(newLast, last)
      }
      last = newLast
    }
    span(
      bindNode(last)
    )
  }
}

object RxAttr {
  def apply[Builder, T: AttrValue](attr: scalatags.generic.Attr, v: Rx[T]) = {
    val attrValue = new AttrValue[Rx[T]] {
      def apply(t: Element, a: Attr, r: Rx[T]): Unit = {
        val _ = r.trigger { implicitly[AttrValue[T]].apply(t, a, r.now) }
      }
    }
    scalatags.generic.AttrPair(attr, v, attrValue)
  }
}