mavigator-cockpit/src/main/scala/mavigator/index/Util.scala


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

package mavigator.index

import scala.language.implicitConversions

import org.scalajs.dom.html

import rx._

import scala.util.Try
import scala.util.Success
import scala.util.Failure

import scalatags.JsDom.all._

object Util {

  /**
   * Copied from https://github.com/lihaoyi/workbench-example-app/blob/todomvc/src/main/scala/example/Framework.scala
   *
   * Sticks some Rx into a Scalatags fragment, which means hooking up an Obs
   * to propagate changes into the DOM via the element's ID. Monkey-patches
   * the Obs onto the element itself so we have a reference to kill it when
   * the element leaves the DOM (e.g. it gets deleted).
   */
  implicit def rxMod(r: Rx[HtmlTag])(implicit owner: Ctx.Owner): Frag = {
    def rSafe = r.toTry match {
      case Success(v) => v.render
      case Failure(e) => span(e.toString, backgroundColor := "red").render
    }
    var last = rSafe
    r.triggerLater{
      val newLast = rSafe
      last.parentElement.replaceChild(newLast, last)
      last = newLast
    }
    bindNode(last)
  }

}