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import japgolly.scalajs.react.React
import japgolly.scalajs.react.vdom.VDomBuilder
import scala.scalajs.js
import scala.scalajs.js.annotation.JSExport
import org.scalajs.dom
import org.scalajs.dom.extensions._
import scala.collection.mutable
import scalatags.JsDom.all._
case class Tree[T](name: T, children: Vector[Tree[T]])
@JSExport
object Controller{
def munge(name: String) = {
name.replace(" ", "")
}
def addClass(el: dom.HTMLElement, cls: String) = {
removeClass(el, cls)
el.className = el.className + " " + cls
}
def removeClass(el: dom.HTMLElement, cls: String) = {
el.className = el.className.split(' ').filter(_ != cls).mkString(" ")
}
def toggleClass(el: dom.HTMLElement, cls: String) = {
val frags = el.className.split(' ')
if (!frags.contains(cls)) addClass(el, cls)
else removeClass(el, cls)
}
@JSExport
def main(data: scala.scalajs.js.Any) = {
val structure = upickle.readJs[Tree[String]](upickle.json.readJs(data))
var i = 0
def recurse(t: Tree[String]): Tree[(String, String, Int)] = {
val curr = (t.name, munge(t.name), i)
i += 1
val children = t.children.map(recurse)
Tree(curr, children)
}
val Seq(main, menu, layout, menuLink) = Seq(
"main", "menu", "layout", "menuLink"
).map(dom.document.getElementById)
val snippets = dom.document.getElementsByClassName("highlight-me")
snippets.foreach(js.Dynamic.global.hljs.highlightBlock(_))
val headers = {
def offset(el: dom.HTMLElement, parent: dom.HTMLElement): Double = {
if (el == parent) 0
else el.offsetTop + offset(el.offsetParent.asInstanceOf[dom.HTMLElement], parent)
}
val menuItems = {
def rec(current: Tree[String]): Seq[String] = {
current.name +: current.children.flatMap(rec)
}
rec(structure).tail
}
menuItems.map(munge)
.map(dom.document.getElementById)
.map(offset(_, main))
.toVector
}
val menuBar = React.renderComponent(
Menu(recurse(structure)),
menu
)
menuLink.onclick = (e: dom.MouseEvent) => {
toggleClass(layout, "active")
toggleClass(menu, "active")
toggleClass(menuLink, "active")
}
var scrolling = false
main.onscroll = (e: dom.UIEvent) => {
if (!scrolling){
scrolling = true
dom.requestAnimationFrame{(d: Double) =>
scrolling = false
val threshold = main.scrollTop + main.clientHeight
var index = 0
while(index < headers.length && index >= 0){
index += 1
if (headers(index) > threshold) index *= -1
}
index = -index
menuBar.setState(index)
}
}
}
}
def isElementInViewport(el: dom.HTMLElement) = {
val rect = el.getBoundingClientRect()
rect.top >= 0 && rect.bottom <= dom.innerHeight
}
import japgolly.scalajs.react._ // React
import vdom.ReactVDom._ // Scalatags → React virtual DOM
import vdom.ReactVDom.all._ // Scalatags html & css (div, h1, textarea, etc.)
val Menu = ReactComponentB[Tree[(String, String, Int)]]("Menu")
.getInitialState(_ => 0)
.render{ (structure, _, index) =>
val contentList = {
var i = 0
def rec1(current: Tree[(String, String, Int)]): Tree[(String, String, Int, Boolean)] = {
val initialI = i
i += 1
val children = current.children.map(rec1)
val win = i >= index && initialI < index
Tree(
(current.name._1, current.name._2, current.name._3, win),
children
)
}
def rec(current: Tree[(String, String, Int, Boolean)],
depth: Int,
classes: String): Iterator[Tag] = {
val winIndex = current.children.indexWhere(_.name._4)
val (before, after) = current.children.splitAt(winIndex)
val myCls =
"menu-item" +
(if (depth <= 1) " menu-item-divided" else "")
val (name, munged, currIndex, win) = current.name
val frag =
li(paddingLeft := s"${depth * 15}px")(
a(
name,
href:="#"+munged,
cls:=myCls
),
cls:=classes + (if (win) " pure-menu-selected" else "")
)
val afterCls = if (!win) "hide" else ""
Iterator(frag) ++
before.flatMap(rec(_, depth+1, "lined")) ++
after.flatMap(rec(_, depth+1, afterCls))
}
rec(rec1(structure), 0, "")
}
val frag = div(cls:="pure-menu pure-menu-open")(
a(cls:="pure-menu-heading", href:="#")(
"Contents"
),
ul(cls:="menu-item-list")(
contentList.drop(1).toVector
)
)
frag
}.build
}
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