{
  "version": 3,
  "sources": ["../../src/es6/Shimmer.js", "../../src/es6/Shimmer2.js", "../../src/es6/Basic.js"],
  "sourcesContent": ["\n/**\n * Shimmer applies styles and animations to an element based on a few computations.\n * The first computation is whether the element is below-screen, on-screen or above-screen.\n */\nexport class Shimmer {\n\tconstructor(e) {\n\t\tthis.el = e;\n\n\t\tlet k = Shimmer.findKeyframe(e.getAttribute(`data-keyframe`));\n\t\tif (!k) {\n\t\t\tconsole.log(`failed to find @keyframe ${e.getAttribute(`data-keyframe`)}`);\n\t\t\treturn;\n\t\t}\n\t\tdocument.addEventListener(`scroll`, evt=>{\n\t\t\tthis.scroll(evt);\t\t\t\n\t\t}, { passive: true });\n\t\tdocument.addEventListener(`resize`, evt=>{\n\t\t\tthis.apply();\n\t\t}, { passive: true });\n\t\tthis.keyframes = new KeyframeEffect(this.el,\n\t\t\tk,\n\t\t\t{\n\t\t\t\tduration: 3000, \n\t\t\t\tfill: `forwards`,\n\t\t\t\trepeat: 1,\n\t\t\t\t// easing: \"none\",\n\t\t\t}\n  \t\t\t);\n\n\t\tthis.animate = new Animation(this.keyframes, document.timeline);\n\t\tthis.animate.startTime = 0;\n\t\tthis.animate.pause();\n\t\tthis.animate.currentTime = 1500;\n\t\tthis.apply();\n\t}\n\n\t/**\n\t * Camelize a string, cutting the string by multiple separators like\n\t * hyphens, underscores and spaces.\n\t * \n\t * @param {text} string Text to camelize\n\t * @return string Camelized text\n\t */\n\tstatic camelize(text) {\n\t    return text.replace(/^([A-Z])|[\\s-_]+(\\w)/g, function(match, p1, p2, offset) {\n\t        if (p2) return p2.toUpperCase();\n\t        return p1.toLowerCase();        \n\t    });\n\t}\n\t/**\n\t *  findKeyframe finds the last named keyframe sequence with the given\n\t * name, and converts it to a keyframe format per \n\t * https://developer.mozilla.org/en-US/docs/Web/API/Web_Animations_API/Keyframe_Formats\n\t */\n\tstatic findKeyframe(name) {\n\t\tlet lastRule = null;\n\t\tfor (let s of document.styleSheets) {\n\t\t\tfor (let c of s.cssRules) {\n\t\t\t\tif (c.name==name && c.type==c.KEYFRAMES_RULE) {\n\t\t\t\t\tlastRule = c;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tif (!lastRule) return null;\n\t\t// Convert lastRule into a Keyframe format\n\t\tlet ks = [];\n\t\tfor (let r of lastRule.cssRules) {\n\t\t\tlet s = {};\n\t\t\tfor (let i=0; i<r.style.length; i++) {\n\t\t\t\tlet p = r.style[i];\n\t\t\t\ts[Shimmer.camelize(p)] = r.style.getPropertyValue(p);\n\t\t\t}\n\t\t\tlet p = parseInt(r.keyText);\n\t\t\ts[`offset`] = p/100.0;\n\t\t\tks.push(s);\n\t\t}\n\t\tconsole.log(`ks = `, ks);\n\t\treturn ks;\n\t}\n\t// apply applies the computation and sets styles based on the computed computation.\n\tapply() {\n\t\tif (!this.el.classList.contains(`Shimmer`))\n\t\t\tthis.el.classList.add(`Shimmer`);\n\n\t\t/*\n\t\t * We are going to scale our animation through a range [0,1], such that 0 occurs when the bottom\n\t\t * of the element passes off screen to the top, and 1 happens when the \n\t\t * TOP of the element passes off the bottom of the screen.\n\t\t *\n\t\t * So, in terms of the TOP of the element, we first find the element height:\n\t\t */\n\t\tlet r = this.el.getBoundingClientRect();\n\t\t/*\n\t\t * Now \n\t\t *     height = r.height\n\t\t * , and \n\t\t *     absTop = r.top + window.scrollY;\n\t\t *\n\t\t * So the bottom of the element passes off the top of the screen when \n\t\t * the absTop <= window.scrollY - height\n\t\t *\n\t\t * and the top of the element passes off the bottom of the screen when\n\t\t * absTop > scrollY + top.innerHeight\t\t \n\t\t */\n\t\tlet yTop = r.top + window.scrollY;\n\t\tlet yProp = (yTop - (window.scrollY - r.height)) / (top.innerHeight + r.height);\n\t\tyProp = 1-Math.min(Math.max(yProp, 0), 1);\n\t\tthis.animate.currentTime = yProp * 3000;\n\n\t}\n\tscroll(evt) {\n\t\tthis.apply();\n\t}\n\tstatic init() {\n\t\tfor (let e of document.querySelectorAll(`[data-instance=\"Shimmer\"]`)) {\n\t\t\tnew Shimmer(e);\n\t\t}\n\t}\n}", "export class Shimmer2 {\n\tconstructor(e) {\n\t\tthis.el = e;\n\t\tthis.classes = [];\n\t\tthis.classes[-1] = this.el.getAttribute(`data-aboveclass`);\n\t\tthis.classes[0] = this.el.getAttribute(`data-onclass`);\n\t\tthis.classes[1] = this.el.getAttribute(`data-belowclass`);\n\n\t\tdocument.addEventListener(`scroll`, evt=>{\n\t\t\tthis.apply();\n\t\t}, { passive: true });\n\t\tdocument.addEventListener(`resize`, evt=>{\n\t\t\tthis.apply();\n\t\t}, { passive: true });\n\t\tthis._position = false;\n\t\tthis.apply();\n\t}\n\n\tapply() {\n\t\tlet p = this.position();\n\t\tif (p===this._position) return;\n\t\tconsole.log(`Shimmer2 applying...`);\n\t\tthis._position = p;\n\t\tfor (let i=-1; i<=1; i++) {\n\t\t\tif (p===i) {\n\t\t\t\tthis.el.classList.add(this.classes[i]);\n\t\t\t} else {\n\t\t\t\tthis.el.classList.remove(this.classes[i]);\n\t\t\t}\n\t\t}\n\t}\n\n\t// position returns -1 if we are 'above' the element (ie scrolling down, the element is still to come),\n\t// 0 if we are 'on' the element,\n\t// and 1 if we are 'below' the element (ie we have scrolled past the element)\n\tposition() {\n\t\tlet midline = window.scrollY + top.innerHeight/2;\n\t\tlet delta = top.innerHeight/4;\n\t\tlet r = this.el.getBoundingClientRect();\n\t\tlet elTop = window.scrollY + r.top;\n\t\tlet elBottom = elTop + r.height;\n\n\t\tif (elTop > midline + delta) {\n\t\t\treturn -1;\n\t\t}\n\t\tif (elBottom < midline-delta) {\n\t\t\treturn 1;\n\t\t}\n\t\treturn 0;\t// we are 'on' the element\n\t}\n\tstatic init() {\n\t\tfor (let e of document.querySelectorAll(`[data-instance=\"Shimmer2\"]`)) {\n\t\t\tnew Shimmer2(e);\n\t\t}\n\t}\n}", "import {Shimmer} from './Shimmer.js';\nimport {Shimmer2} from './Shimmer2.js';\n\nclass Basic {\n\tstatic init() {\n\t\tconsole.log(`Basic::init()`);\n\t\tShimmer.init();\n\t\tShimmer2.init();\n\t}\t\n}\n\ndocument.addEventListener(`DOMContentLoaded`, Basic.init);"],
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