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updated to version 2.0.0 using vanilla-js only
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@@ -41,3 +41,4 @@ Icon | |
| Network Trash Folder | ||
| Temporary Items | ||
| .apdisk | ||
| /jQuery.fakeScroll.js | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| ;(function(){ | ||
| raf = window.requestAnimationFrame || function(cb) { return window.setTimeout(cb, 1000 / 60) }; | ||
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| function FakeScroll(targetElm, settings){ | ||
| if( !targetElm ) return; | ||
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| this.settings = Object.assign({}, this.defaults, settings || {}); | ||
| this.settings.offset = this.settings.offset.split(' '); // convert offset String to Array | ||
| this.callback = settings.callback ? settings.callback : null; | ||
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| this.state = {}; | ||
| this.listeners = {}; | ||
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| this.DOM = this.build(targetElm); | ||
| this.events.binding.call(this, this.DOM); | ||
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| // run "moveBar" once | ||
| setTimeout(this.moveBar.bind(this)); | ||
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| } | ||
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| FakeScroll.prototype = { | ||
| defaults : { | ||
| classname : "", | ||
| track : false, | ||
| offset : "0 0 0 0" | ||
| }, | ||
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| /** | ||
| * Build the DOM needed | ||
| */ | ||
| build( targetElm ){ | ||
| var DOM = {}; | ||
| scopeHTML = `<div class="fakeScroll__wrap"> | ||
| <div class="fakeScroll__content"></div> | ||
| </div> | ||
| <div class='fakeScroll__track'> | ||
| <div class="fakeScroll__bar ${this.settings.classname}"></div> | ||
| </div>`, | ||
| fragment = document.createDocumentFragment(); | ||
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| // move all the children of the target element into a fragment | ||
| while( targetElm.childNodes.length ){ | ||
| fragment.appendChild(targetElm.childNodes[0]); | ||
| } | ||
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| targetElm.insertAdjacentHTML('afterbegin', scopeHTML); | ||
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| DOM.scrollWrap = targetElm.firstElementChild; | ||
| DOM.scrollContent = DOM.scrollWrap.firstElementChild; | ||
| DOM.scrollContent.appendChild(fragment); | ||
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| DOM.track = DOM.scrollWrap.nextElementSibling; | ||
| DOM.bar = DOM.track.firstElementChild; | ||
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| return DOM; | ||
| }, | ||
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| events : { | ||
| on(elm, eName, cbName){ | ||
| // to be able tp unbind the events, callback refferece must be saved somewhere | ||
| eName.split(' ').forEach(e => { | ||
| if( !(cbName in this.events.callbacks) ) console.warn(cbName, " doesn't exist in Callbacks: ", this.events.callbacks); | ||
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| this.listeners[e] = this.events.callbacks[cbName].bind(this); | ||
| elm.addEventListener(e, this.listeners[e]) | ||
| }); | ||
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| return this.events; | ||
| }, | ||
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| off(elm, eName, cbName){ | ||
| eName.split(' ').forEach(e => elm.removeEventListener(e, this.listeners[e])) | ||
| return this.events; | ||
| }, | ||
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| binding(DOM){ | ||
| this.events.on.call(this, DOM.scrollContent, 'scroll mouseenter', 'onScrollResize') | ||
| .on.call(this, window, 'resize', 'onScrollResize') | ||
| .on.call(this, DOM.bar, 'mousedown', 'onBarMouseDown') | ||
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| if( this.settings.track ) | ||
| this.events.on.call(this, DOM.track, 'click', 'onTrackClick') | ||
| }, | ||
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| /** | ||
| * events only binded when Bar element gets a "mousedown" event | ||
| * @param {[type]} onOff [description] | ||
| * @return {[type]} [description] | ||
| */ | ||
| drag(onOff){ | ||
| this.events[onOff].call(this, document, 'mousemove', 'onDrag') | ||
| [onOff].call(this, document, 'mouseup', 'onStopDrag') | ||
| }, | ||
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| callbacks : { | ||
| onScrollResize(e){ | ||
| this.moveBar.call(this) | ||
| }, | ||
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| onDrag(e){ | ||
| var delta = e.pageY - this.state.lastPageY; | ||
| this.state.lastPageY = e.pageY; | ||
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| raf(() => { | ||
| this.DOM.scrollContent.scrollTop += delta / this.scrollRatio; | ||
| }); | ||
| }, | ||
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| onStopDrag(e){ | ||
| [this.DOM.bar, document.body].map(el => el.classList.remove('fakeScroll--grabbed')) | ||
| this.events.drag.call(this, 'off'); | ||
| setTimeout(()=>{ this.state.drag = false }) | ||
| }, | ||
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| onBarMouseDown(e){ | ||
| this.state.drag = true; | ||
| this.state.lastPageY = e.pageY; | ||
| [this.DOM.bar, document.body].map(el => el.classList.add('fakeScroll--grabbed')) | ||
| this.events.drag.call(this, 'on'); | ||
| }, | ||
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| onTrackClick(e){ | ||
| if( this.state.drag ) return; | ||
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| var bounds = e.target.getBoundingClientRect(), | ||
| styles = window.getComputedStyle(e.target, null), | ||
| boundsPad = [parseInt(styles.paddingTop, 10), 0, parseInt(styles.paddingBottom, 10), 0], | ||
| perc = (e.clientY - bounds.top) / (bounds.height - boundsPad[0] - boundsPad[2]), | ||
| scrollHeight = this.DOM.scrollContent.scrollHeight, | ||
| ownHeight = this.DOM.scrollWrap.clientHeight, | ||
| newScrollTop = perc * (scrollHeight - ownHeight); | ||
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| if( this.settings.track == 'smooth' ){ | ||
| this.DOM.scrollContent.style.scrollBehavior = 'smooth'; | ||
| setTimeout(()=>{ this.DOM.scrollContent.style.scrollBehavior = 'unset' }, 500) | ||
| } | ||
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| this.DOM.scrollContent.scrollTop = newScrollTop; | ||
| } | ||
| } | ||
| }, | ||
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| destroy(){ | ||
| this.events.off.call(this, window, 'resize', 'onScrollResize'); | ||
| }, | ||
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| moveBar(){ | ||
| // if( !this.DOM.scrollContent ) return false; | ||
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| var _scrollContent = this.DOM.scrollContent, | ||
| scrollHeight = _scrollContent.scrollHeight, | ||
| ownHeight = this.DOM.scrollWrap.clientHeight; | ||
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| this.scrollRatio = ownHeight / scrollHeight; | ||
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| // update fake scrollbar location on the Y axis using requestAnimationFrame | ||
| raf(()=> { | ||
| var height = (ownHeight / scrollHeight) * 100, | ||
| top = (_scrollContent.scrollTop / scrollHeight ) * 100; | ||
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| this.DOM.bar.style.cssText = `height : calc(${height}% - ${this.settings.offset[0]}px); | ||
| top : calc(${top}% + ${this.settings.offset[0]}px); | ||
| display : ${scrollHeight <= ownHeight ? 'none' : ''}`; | ||
| }); | ||
| } | ||
| } | ||
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| Element.prototype.fakeScroll = function( settings ){ | ||
| this._fakeScroll = this._fakeScroll || new FakeScroll(this, settings || {}); | ||
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| return this._fakeScroll; | ||
| } | ||
| })(); |
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