{
  "version": 3,
  "sources": ["node_modules/imba/src/imba/events/intersect.imba"],
  "sourcesContent": ["# imba$imbaPath=global\n\nimport {Event,CustomEvent,Element,Document} from '../dom/core'\nimport * as helpers from './helpers'\n\nexport def use_events_intersect\n\tyes\n\nconst observers = new (global.WeakMap || Map)\nexport const IntersectionEventDefaults = {threshold: [0]}\nconst viewport = {}\nconst defaults = IntersectionEventDefaults\n\ndef Event.intersect$handle\n\tlet obs = event.detail.observer\n\treturn modifiers._observer == obs\n\nclass IntersectionEvent < CustomEvent\n\t\n\tdef @in\n\t\treturn delta >= 0 and entry.isIntersecting\n\t\t\n\tdef @out\n\t\treturn delta < 0 # and entry.isIntersecting\n\t\t\n\tdef @css name = 'ratio'\n\t\ttarget.style.setProperty(\"--ratio\",ratio)\n\t\treturn yes\n\t\n\tdef @flag name, sel\n\t\tlet {state,step} = #context\n\t\tlet el = helpers.toElement(sel or '',target)\n\n\t\tif self.isIntersecting and !state[step]\n\t\t\tel.flags.incr(name)\n\t\t\tstate[step] = yes\n\t\telif state[step] and !self.isIntersecting\n\t\t\tel.flags.decr(name)\n\t\t\tstate[step] = no\n\t\treturn yes\n\n\ndef callback name, key\n\treturn do(entries,observer)\n\t\tlet map = observer.prevRatios ||= new WeakMap\n\t\t\n\t\tfor entry in entries\n\t\t\tlet prev = map.get(entry.target) or 0\n\t\t\tlet ratio = entry.intersectionRatio\n\t\t\tlet detail = {entry: entry, ratio: ratio, from: prev, delta: (ratio - prev), observer: observer }\n\t\t\tlet e = new CustomEvent(name, bubbles: false, detail: detail)\n\t\t\te.#extendType(IntersectionEvent)\n\t\t\te.entry = entry\n\t\t\te.isIntersecting = entry.isIntersecting\n\t\t\te.delta = detail.delta\n\t\t\te.ratio = detail.ratio\n\n\t\t\tmap.set(entry.target,ratio)\n\t\t\tentry.target.dispatchEvent(e)\n\t\treturn\n\ndef getIntersectionObserver opts = IntersectionEventDefaults\n\tlet key = opts.threshold.join('-') + opts.rootMargin\n\tif !opts.root and IntersectionEventDefaults.root\n\t\topts.root ||= IntersectionEventDefaults.root\n\tlet target = opts.root or viewport\n\tlet map = observers.get(target)\n\tmap || observers.set(target,map = {})\n\tmap[key] ||= new IntersectionObserver(callback('intersect',key),opts)\n\nextend class Element\n\tdef on$intersect mods,context,handler,o\n\t\tlet obs\n\t\tif mods.options\n\t\t\tlet th = [] \n\t\t\tlet opts = {threshold:th}\n\n\t\t\tfor arg in mods.options\n\t\t\t\tif arg isa Element or arg isa Document\n\t\t\t\t\topts.root = arg\n\t\t\t\telif typeof arg == 'number'\n\t\t\t\t\tth.push(arg)\n\t\t\t\telif typeof arg == 'string'\n\t\t\t\t\topts.rootMargin = arg\n\t\t\t\telif typeof arg == 'object'\n\t\t\t\t\tObject.assign(opts,arg)\n\t\t\t\t\t\n\t\t\tif th.length == 1\n\t\t\t\tlet num = th[0]\n\t\t\t\tif num > 1\n\t\t\t\t\tth[0] = 0\n\t\t\t\t\twhile th.length < num\n\t\t\t\t\t\tth.push(th.length / (num - 1))\n\n\t\t\tth.push(0) if th.length == 0\n\t\t\tobs = getIntersectionObserver(opts)\n\t\telse\n\t\t\tobs = getIntersectionObserver()\n\n\t\tmods._observer = obs\n\t\tobs.observe(this)\n\t\tself.addEventListener('intersect',handler,o)\n\t\treturn handler"],
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