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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(" ", "")
}
@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], depth: Int): Tree[(dom.HTMLElement, Int, Int)] = {
val curr =
li(
a(
t.name,
href:="#"+munge(t.name),
cls:="menu-item"
)
)
val originalI = i
i += 1
val children = t.children.map(recurse(_, depth + 1))
Tree(
(
curr(ul(paddingLeft := "15px",children.map(_.name._1))).render,
originalI,
if (children.length > 0) children.map(_.name._3).max else originalI + 1
),
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(_))
def offset(el: dom.HTMLElement, parent: dom.HTMLElement): Double = {
if (el == parent) 0
else el.offsetTop + offset(el.offsetParent.asInstanceOf[dom.HTMLElement], parent)
}
val headers = {
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
}
println(headers)
val domTrees = structure.children.map(recurse(_, 0))
menu.appendChild(
div(cls:="pure-menu pure-menu-open")(
a(cls:="pure-menu-heading", href:="#")(
"Contents"
),
ul(cls:="menu-item-list")(
domTrees.map(_.name._1)
)
).render
)
menuLink.onclick = (e: dom.MouseEvent) => {
layout.classList.toggle("active")
menu.classList.toggle("active")
menuLink.classList.toggle("active")
}
var scrolling = false
var lastSelected: dom.HTMLElement = null
def start() ={
scrolling = false
val threshold = main.scrollTop + main.clientHeight
def walkTree(tree: Tree[(dom.HTMLElement, Int, Int)]): Boolean = {
val Tree((menuItem, index, next), children) = tree
val before = headers(index) < threshold
val after = (next >= headers.length) || headers(next) > threshold
val win = before && after
if (win){
menuItem.classList.remove("hide")
var winFound = false
for(c <- tree.children){
val newWinFound = walkTree(c)
if (!winFound) c.name._1.classList.add("selected")
else c.name._1.classList.remove("selected")
winFound = winFound | newWinFound
}
if (!winFound) {
tree.children.foreach(_.name._1.classList.remove("selected"))
if (lastSelected != null)
lastSelected.children(0).classList.remove("pure-menu-selected")
menuItem.children(0).classList.add("pure-menu-selected")
lastSelected = menuItem
}
}else{
menuItem.classList.add("hide")
menuItem.classList.remove("selected")
}
win
}
domTrees.map(walkTree)
}
main.onscroll = (e: dom.UIEvent) => if (!scrolling){
scrolling = true
dom.requestAnimationFrame((d: Double) => start())
}
}
def isElementInViewport(el: dom.HTMLElement) = {
val rect = el.getBoundingClientRect()
rect.top >= 0 && rect.bottom <= dom.innerHeight
}
}
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