├── .gitignore ├── package.json ├── LICENSE ├── example ├── css │ ├── playground.css │ └── foundation.min.css ├── js │ └── playground.js ├── playground.html └── index.html ├── README.md └── js └── reactive-listener.js /.gitignore: -------------------------------------------------------------------------------- 1 | *.swp 2 | .DS_Store 3 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "reactive-listener", 3 | "version": "0.0.1", 4 | "description": "JavaScript library for building reactive animations", 5 | "dependencies": {}, 6 | "devDependencies": {}, 7 | "repository": { 8 | "type": "git", 9 | "url": "git://github.com/zurb/reactive-listener.git" 10 | }, 11 | "author": "Kevin Ball ", 12 | "license": "MIT" 13 | } 14 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2017 ZURB 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /example/css/playground.css: -------------------------------------------------------------------------------- 1 | .hidden-area { 2 | padding-top: 40px; 3 | border: 1px dashed #ccc; 4 | opacity: 0; 5 | height: 0; 6 | overflow: hidden; 7 | margin-bottom: 0px; 8 | position: relative; 9 | top: -40px; 10 | } 11 | 12 | .open-container { 13 | position: relative; 14 | margin-top: 20px; 15 | } 16 | 17 | .open-container:before { 18 | content: ""; 19 | border-bottom: 1px dashed #ccc; 20 | width: 100%; 21 | position: absolute; 22 | left: 0; 23 | top: 50%; 24 | } 25 | 26 | .open-prompt { 27 | display: block; 28 | margin: auto; 29 | width: 50px; 30 | height: 50px; 31 | border-radius: 5000px; 32 | border: 1px solid #222; 33 | text-align: center; 34 | position: relative; 35 | background-color: #fff; 36 | z-index: 1; 37 | } 38 | .open-prompt:hover { 39 | box-shadow: inset 0 0 15px 0px #0ff; 40 | } 41 | 42 | .open-prompt .glow, .open-prompt .inner-glow { 43 | position: absolute; 44 | width: 50px; 45 | height: 50px; 46 | border-radius: 5000px; 47 | opacity: 0; 48 | left: -1px; 49 | top: -1px; 50 | box-shadow: 0 0 100px 10px #0ff; 51 | } 52 | 53 | 54 | .open-prompt:before { 55 | content: "+"; 56 | position: absolute; 57 | left: 50%; 58 | top: 50%; 59 | transform: translate(-50%, -50%); 60 | } 61 | .open-prompt.open:before { 62 | content: "-"; 63 | } 64 | -------------------------------------------------------------------------------- /example/js/playground.js: -------------------------------------------------------------------------------- 1 | var $opener = $('[data-open-prompt]'); 2 | 3 | ReactiveListener.add($('[data-open-prompt] .glow')[0], { 4 | 'Pointer2d': [{ 5 | property: 'opacity', 6 | unit: '', 7 | range: [1, 0], 8 | maxDist: 250, 9 | forceMax: true, 10 | directional: false, 11 | start: 0, 12 | relative: 'viewport' 13 | }, 14 | { 15 | property: 'opacity', 16 | unit: '', 17 | range: [0, 1], 18 | maxDist: 80, 19 | forceMax: false, 20 | directional: false, 21 | start: 0, 22 | relative: 'viewport' 23 | }, 24 | { 25 | callback: function(opts) { 26 | var dist = opts.dist['Pointer2d']; 27 | if(dist === 0) { 28 | return false; 29 | } else { 30 | if(dist < 50) { 31 | var height = ((50 - dist) / 50) * 150; 32 | $('#hidden-area').css({height: height, opacity: (50 - dist)/100}); 33 | } 34 | } 35 | } 36 | } 37 | ] 38 | }); 39 | 40 | ReactiveListener.start(); 41 | 42 | $opener.click(function() { 43 | if($opener.hasClass('open')) { 44 | $opener.removeClass('open'); 45 | ReactiveListener.start(); 46 | $('.hidden-area').animate({opacity: 0.5, height: '150px'}); 47 | } else { 48 | $opener.addClass('open'); 49 | ReactiveListener.stop(); 50 | $('.hidden-area').animate({opacity: 1, height: '300px'}); 51 | } 52 | }); 53 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## Installation 2 | 3 | `npm install reactive-listener` 4 | 5 | ## Basic Usage 6 | 7 | Start by adding the reactive listener javascript to your page 8 | 9 | 10 | <script src="js/reactive-listener.js"> 11 | 12 | 13 | Next, you'll need to identify the elements you want to animated, what property you want to animate, and what behavior they're going to be reacting to, for example x distance from mouse, y distance from mouse, or 2d distance from mouse. Once you have these, you'll initialize the reactive listener, and let it handle things from there. In the example above, we're animating opacity on a '.glow' element based on 2d distance once the mouse is within 450 pixels. For simplicity, lets show what this looks like with a single element with id 'glow' and a single animation: 14 | 15 | ``` 16 | var glow = document.getElementById('glow'); 17 | ReactiveListener.add(glow, { 18 | 'Pointer2d': [ 19 | property: 'opacity', 20 | range: [1, 0], 21 | unit: '', 22 | maxDist: 450, 23 | forceMax: true, 24 | directional: false, 25 | start: 0 26 | ] 27 | }) 28 | ReactiveListener.start(); 29 | ``` 30 | 31 | Breaking down the pieces, what we've done here is first find the element, then add a listener that will react to the 2d distance ('Pointer2d') with a particular configuration. What are those different configuration settings doing? 32 | 33 | * **property**: This is the property being animated, in this case opacity. 34 | * **range**: What range are we animating between? For opacity, we want to go between 1 (visible) and 0 (invisible) 35 | * **unit**: This is the unit being applied to the range... for opacity there is no unit, but if we were doing a translate or something similar, we might need a 'px' or a 'rem' as unit. 36 | * **maxDist**: What is the maximum distance where we want to have any sort of animation... in this case we don't want to do anything until we get below 450. 37 | * **forceMax**: If we're outside the max, should we do nothing? Or force the value to the max? In this case we want to force to the max (invisible), but if we were chaining another animation we might want to do nothing and let the later animation take control. 38 | * **directional**: Does it matter if we're positive or negative relative to the object? For 2d distance, we'll always be positive, but if we were listining to x or y only the concepts of positive and negative matter. 39 | * **start**: What value should the animation start at? 40 | 41 | The extra cool thing comes when we start to chain behaviors. A single element can have any number of reactive animations chained into the listener. Each animation is calculated in order, and then applied in bulk, so if there are multiple animations that apply to the same property (say you have two overlapping ranges), the last one in the array applies. 42 | 43 | NOTE: This library is currently a prototype. Please be liberal with filing issues and feature requests. 44 | 45 | ## Try It Out 46 | 47 | We've prepped a couple codepen examples to start playing with the possibilities here: 48 | 49 | http://codepen.io/kball/pen/egJGJz 50 | 51 | http://codepen.io/kball/pen/jMojNQ 52 | -------------------------------------------------------------------------------- /example/playground.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | ZURB Reactive Listener | Demo 8 | 9 | 10 | 11 | 12 | 13 |
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Reactive Listener Demo

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97 | 98 | 99 | 159 | 160 | 161 | -------------------------------------------------------------------------------- /js/reactive-listener.js: -------------------------------------------------------------------------------- 1 | (function() { 2 | var ReactiveListener = window.ReactiveListener = { 3 | elements: [] 4 | }; 5 | 6 | 7 | // For now use options that look something like: 8 | //{ 9 | // 'PointerX': { 10 | // property: 'translateX', 11 | // range: ['-50%','50%'], 12 | // relative: 'viewport' 13 | // }, 14 | // 'PointerY': { 15 | // property: 'translateY', 16 | // range: ['-10%','10%'], 17 | // relative: 'viewport' 18 | // }, 19 | //} 20 | ReactiveListener.add = function(elem, options) { 21 | var i, item = {elem: elem, options: options}; 22 | for (var key in options) { 23 | if(Array.isArray(options[key])) { 24 | for(i = 0; i < options[key].length; i++) { 25 | item.options[key][i].current = options[key][i].start || 0; 26 | } 27 | } else { 28 | item.options[key].current = options[key].start || 0; 29 | } 30 | } 31 | // TODO: I think we'll need to do this at least on resize & scroll, 32 | // to account for things like fixed positioning. 33 | item = ReactiveListener.addLocationAndDimensions(item); 34 | ReactiveListener.elements.push(item); 35 | }; 36 | 37 | 38 | ReactiveListener.addLocationAndDimensions = function(item) { 39 | 40 | // TODO: Refactor window pieces so we can loop over elems without recalculating 41 | var rect = item.elem.getBoundingClientRect(), 42 | winY = window.pageYOffset, 43 | winX = window.pageXOffset; 44 | 45 | item.box = { 46 | left: rect.left + winX, 47 | right: rect.left + rect.width + winX, 48 | top: rect.top + winY, 49 | bottom: rect.top + winY + rect.height 50 | }; 51 | return item; 52 | } 53 | 54 | // TODO: Look up standards 55 | ReactiveListener.setMouseProperties = function(event) { 56 | ReactiveListener.mouse = { 57 | x: event.x, 58 | y: event.y, 59 | pageX: event.pageX, 60 | pageY: event.pageY 61 | } 62 | }; 63 | 64 | ReactiveListener.handleMouseMove = function(event) { 65 | // TODO: Debounce 66 | ReactiveListener.setMouseProperties(event); 67 | window.requestAnimationFrame(ReactiveListener.render); 68 | }; 69 | 70 | function ease(current, target, ease) { 71 | if(Math.abs(target - current) < (ease || 0.5)) { 72 | return target; 73 | } 74 | return current + (target - current) * ( ease || 0.05 ); 75 | } 76 | 77 | function distVal(x, y) { 78 | return Math.sqrt(x*x + y*y); 79 | } 80 | 81 | function calculateTargetAndEase(transform, trigger, dist) { 82 | var near = transform.range[0], 83 | far = transform.range[1], 84 | range = Math.abs(far - near), 85 | mid = near + far / 2, 86 | maxDist, target, easer, bounds; 87 | if(trigger === 'PointerX') { 88 | bounds = transform.maxDist || ReactiveListener.winRect.width; 89 | } else if (trigger === 'PointerY') { 90 | bounds = transform.maxDist || ReactiveListener.winRect.height; 91 | } else { 92 | bounds = transform.maxDist || distVal(ReactiveListener.winRect.height, ReactiveListener.winRect.width); 93 | } 94 | 95 | if(!transform.directional) { dist = Math.abs(dist) } 96 | 97 | if(dist > bounds) { 98 | target = far; 99 | } else if (dist < -bounds) { 100 | target = near; 101 | } else { 102 | if(transform.directional) { 103 | if(dist < 0) { 104 | target = mid - ((near - mid) * (dist / bounds)); 105 | } else if(dist > 0){ 106 | target = mid + ((far - mid) * (dist / bounds)); 107 | } else { 108 | target = mid; 109 | } 110 | } else { 111 | target = near + ((far - near) * (dist / bounds)); 112 | } 113 | } 114 | var easer = Math.min(range / 20.0, 0.05); 115 | return {target: target, newValue: ease(transform.current, target, easer)} 116 | } 117 | 118 | ReactiveListener.setWindowDims = function() { 119 | ReactiveListener.winRect = document.body.getBoundingClientRect(); 120 | ReactiveListener.winY = window.pageYOffset; 121 | ReactiveListener.winX = window.pageXOffset; 122 | }; 123 | 124 | function calcYDist(item) { 125 | if(ReactiveListener.mouse.pageY > item.box.bottom) { 126 | return ReactiveListener.mouse.pageY - item.box.bottom; 127 | } else if(ReactiveListener.mouse.pageY < item.box.top) { 128 | return ReactiveListener.mouse.pageY - item.box.top; 129 | } else { 130 | return 0; 131 | } 132 | } 133 | function calcXDist(item) { 134 | if(ReactiveListener.mouse.pageX > item.box.right) { 135 | return ReactiveListener.mouse.pageX - item.box.right; 136 | } else if(ReactiveListener.mouse.pageX < item.box.left) { 137 | return ReactiveListener.mouse.pageX - item.box.left; 138 | } else { 139 | return 0; 140 | } 141 | } 142 | 143 | function calc2dDist(item) { 144 | return distVal(calcXDist(item), calcYDist(item)); 145 | } 146 | 147 | ReactiveListener.render = function() { 148 | var i, j, item, box, dist, trigger, changeSet, changeStrs, change, 149 | transforms, changed = false; 150 | ReactiveListener.setWindowDims(); // TODO: Should this go here? Or only on scroll/resize? 151 | if(ReactiveListener.mouse) { 152 | for(i = 0; i < ReactiveListener.elements.length; i++) { 153 | item = ReactiveListener.elements[i]; 154 | box = item.box; 155 | dist = {'PointerX': calcXDist(item), 'PointerY': calcYDist(item), 'Pointer2d': calc2dDist(item) }; 156 | changeStrs = {}; 157 | for(trigger in item.options) { 158 | if(Array.isArray(item.options[trigger])) { 159 | transforms = item.options[trigger]; 160 | } else { 161 | transforms = [item.options[trigger]] 162 | } 163 | for (j = 0; j < transforms.length; j++) { 164 | 165 | // Thresholds 166 | if((transforms[j].forceMin === false) && transforms[j].minDist && (transforms[j].minDist > Math.abs(dist[trigger]))) { continue; } 167 | if((transforms[j].forceMax === false) && transforms[j].maxDist && (transforms[j].maxDist < Math.abs(dist[trigger]))) { continue; } 168 | 169 | 170 | // JS Callback 171 | if(transforms[j].callback) { 172 | var resp = transforms[j].callback({item: item, dist: dist, mousePosition: ReactiveListener.mouse}); 173 | // if callback returns false, apply no changes to this elem. 174 | if(resp === false) { 175 | changeStrs = []; 176 | break; 177 | } else { 178 | continue; 179 | } 180 | } 181 | // Straight CSS properties 182 | changeSet = calculateTargetAndEase(transforms[j], trigger, dist[trigger]); 183 | transforms[j].current = changeSet.newValue; 184 | if(transforms[j].property === 'transform') { 185 | changeStrs['transform'] = changeStrs['transform'] || ''; 186 | changeStrs['transform'] = changeStrs['transform'] + transforms[j].transform + '(' + changeSet.newValue + transforms[j].unit + ') '; 187 | } else { 188 | changeStrs[transforms[j].property] = '' + changeSet.newValue + transforms[j].unit; 189 | } 190 | if(changeSet.newValue != changeSet.target) { 191 | changed = true; 192 | } 193 | } 194 | } 195 | for(change in changeStrs) { 196 | item.elem.style[change]= changeStrs[change]; 197 | } 198 | } 199 | if(changed == true) { 200 | window.requestAnimationFrame(ReactiveListener.render); 201 | } 202 | } 203 | 204 | //window.requestAnimationFrame(ReactiveListener.render); 205 | // TODO: Do we ever want to not be requesting? Probably... 206 | }; 207 | 208 | ReactiveListener.start = function() { 209 | document.addEventListener('mousemove', ReactiveListener.handleMouseMove); 210 | } 211 | 212 | ReactiveListener.stop = function() { 213 | document.removeEventListener('mousemove', ReactiveListener.handleMouseMove); 214 | } 215 | 216 | })(); 217 | -------------------------------------------------------------------------------- /example/css/foundation.min.css: -------------------------------------------------------------------------------- 1 | @charset "UTF-8"; 2 | /*! normalize.css v3.0.3 | MIT License | github.com/necolas/normalize.css 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(orientation:portrait){.hide-for-landscape,.show-for-portrait{display:block!important}}.float-left{float:left!important}.float-right{float:right!important}.float-center{display:block;margin-left:auto;margin-right:auto}.clearfix:after,.clearfix:before{content:' ';display:table}.clearfix:after{clear:both} --------------------------------------------------------------------------------