[747e744] | 1 | (function (root, factory) { |
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| 2 | if (typeof exports === 'object') { |
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| 3 | module.exports = factory(); |
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| 4 | } else if (typeof define === 'function' && define.amd) { |
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| 5 | define([], factory); |
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| 6 | } else { |
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| 7 | root.Draggable = factory(); |
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| 8 | } |
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| 9 | }(this, function () { |
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| 10 | |
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| 11 | 'use strict'; |
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| 12 | |
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| 13 | var defaults = { |
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| 14 | |
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| 15 | // settings |
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| 16 | grid: 0, // grid cell size for snapping to on drag |
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| 17 | filterTarget: null, // disallow drag when target passes this test |
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| 18 | limit: { // limit the drag bounds |
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| 19 | x: null, // [minimum position, maximum position] || position |
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| 20 | y: null // [minimum position, maximum position] || position |
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| 21 | }, |
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| 22 | threshold: 0, // threshold to move before drag begins (in px) |
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| 23 | |
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| 24 | // flags |
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| 25 | setCursor: false, // change cursor to reflect draggable? |
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| 26 | setPosition: true, // change draggable position to absolute? |
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| 27 | smoothDrag: true, // snap to grid when dropped, but not during |
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| 28 | useGPU: true, // move graphics calculation/composition to the GPU |
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| 29 | |
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| 30 | // event hooks |
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| 31 | onDrag: noop, // function(element, X, Y, event) |
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| 32 | onDragStart: noop, // function(element, X, Y, event) |
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| 33 | onDragEnd: noop // function(element, X, Y, event) |
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| 34 | |
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| 35 | }; |
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| 36 | |
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| 37 | var env = { |
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| 38 | |
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| 39 | // CSS vendor-prefixed transform property |
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| 40 | transform: (function(){ |
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| 41 | |
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| 42 | var prefixes = ' -o- -ms- -moz- -webkit-'.split(' '); |
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| 43 | var style = document.body.style; |
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| 44 | |
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| 45 | for (var n = prefixes.length; n--;) { |
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| 46 | var property = prefixes[n] + 'transform'; |
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| 47 | if (property in style) { |
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| 48 | return property; |
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| 49 | } |
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| 50 | } |
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| 51 | |
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| 52 | })() |
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| 53 | |
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| 54 | }; |
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| 55 | |
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| 56 | var util = { |
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| 57 | |
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| 58 | assign: function () { |
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| 59 | |
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| 60 | var obj = arguments[0]; |
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| 61 | var count = arguments.length; |
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| 62 | |
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| 63 | for ( var n = 1; n < count; n++ ) { |
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| 64 | var argument = arguments[n]; |
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| 65 | for ( var key in argument ) { |
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| 66 | obj[key] = argument[key]; |
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| 67 | } |
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| 68 | } |
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| 69 | |
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| 70 | return obj; |
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| 71 | |
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| 72 | }, |
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| 73 | |
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| 74 | bind: function (fn, context) { |
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| 75 | return function() { |
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| 76 | fn.apply(context, arguments); |
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| 77 | } |
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| 78 | }, |
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| 79 | |
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| 80 | on: function (element, e, fn) { |
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| 81 | if (e && fn) { |
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| 82 | util.addEvent (element, e, fn); |
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| 83 | } else if (e) { |
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| 84 | for (var ee in e) { |
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| 85 | util.addEvent (element, ee, e[ee]); |
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| 86 | } |
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| 87 | } |
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| 88 | }, |
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| 89 | |
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| 90 | off: function (element, e, fn) { |
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| 91 | if (e && fn) { |
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| 92 | util.removeEvent (element, e, fn); |
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| 93 | } else if (e) { |
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| 94 | for (var ee in e) { |
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| 95 | util.removeEvent (element, ee, e[ee]); |
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| 96 | } |
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| 97 | } |
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| 98 | }, |
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| 99 | |
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| 100 | // Example: |
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| 101 | // |
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| 102 | // util.limit(x, limit.x) |
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| 103 | limit: function (n, limit) { |
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| 104 | // {Array} limit.x |
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| 105 | if (isArray(limit)) { |
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| 106 | limit = [+limit[0], +limit[1]]; |
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| 107 | if (n < limit[0]) n = limit[0]; |
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| 108 | else if (n > limit[1]) n = limit[1]; |
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| 109 | // {Number} limit.x |
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| 110 | } else { |
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| 111 | n = +limit; |
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| 112 | } |
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| 113 | |
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| 114 | return n; |
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| 115 | }, |
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| 116 | |
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| 117 | addEvent: ('attachEvent' in Element.prototype) |
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| 118 | ? function (element, e, fn) { element.attachEvent('on'+e, fn) } |
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| 119 | : function (element, e, fn) { element.addEventListener(e, fn, false) }, |
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| 120 | |
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| 121 | removeEvent: ('attachEvent' in Element.prototype) |
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| 122 | ? function (element, e, fn) { element.detachEvent('on'+e, fn) } |
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| 123 | : function (element, e, fn) { element.removeEventListener(e, fn) } |
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| 124 | |
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| 125 | }; |
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| 126 | |
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| 127 | /* |
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| 128 | usage: |
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| 129 | |
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| 130 | new Draggable (element, options) |
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| 131 | - or - |
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| 132 | new Draggable (element) |
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| 133 | */ |
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| 134 | |
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| 135 | function Draggable (element, options) { |
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| 136 | |
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| 137 | var me = this, |
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| 138 | start = util.bind(me.start, me), |
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| 139 | drag = util.bind(me.drag, me), |
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| 140 | stop = util.bind(me.stop, me); |
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| 141 | |
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| 142 | // sanity check |
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| 143 | if (!isElement(element)) { |
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| 144 | throw new TypeError('Draggable expects argument 0 to be an Element'); |
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| 145 | } |
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| 146 | |
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| 147 | options = util.assign({}, defaults, options); |
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| 148 | |
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| 149 | // set instance properties |
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| 150 | util.assign(me, { |
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| 151 | |
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| 152 | // DOM element |
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| 153 | element: element, |
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| 154 | handle: (options.handle && isElement(options.handle)) |
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| 155 | ? options.handle |
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| 156 | : element, |
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| 157 | |
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| 158 | // DOM event handlers |
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| 159 | handlers: { |
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| 160 | start: { |
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| 161 | mousedown: start, |
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| 162 | touchstart: start |
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| 163 | }, |
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| 164 | move: { |
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| 165 | mousemove: drag, |
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| 166 | mouseup: stop, |
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| 167 | touchmove: drag, |
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| 168 | touchend: stop |
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| 169 | } |
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| 170 | }, |
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| 171 | |
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| 172 | // options |
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| 173 | options: options |
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| 174 | |
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| 175 | }); |
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| 176 | |
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| 177 | // initialize |
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| 178 | me.initialize(); |
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| 179 | |
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| 180 | } |
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| 181 | |
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| 182 | util.assign (Draggable.prototype, { |
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| 183 | |
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| 184 | // public |
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| 185 | |
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| 186 | setOption: function (property, value) { |
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| 187 | |
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| 188 | var me = this; |
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| 189 | |
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| 190 | me.options[property] = value; |
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| 191 | me.initialize(); |
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| 192 | |
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| 193 | return me; |
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| 194 | |
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| 195 | }, |
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| 196 | |
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| 197 | get: function() { |
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| 198 | |
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| 199 | var dragEvent = this.dragEvent; |
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| 200 | |
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| 201 | return { |
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| 202 | x: dragEvent.x, |
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| 203 | y: dragEvent.y |
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| 204 | }; |
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| 205 | |
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| 206 | }, |
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| 207 | |
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| 208 | set: function (x, y) { |
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| 209 | |
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| 210 | var me = this, |
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| 211 | dragEvent = me.dragEvent; |
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| 212 | |
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| 213 | dragEvent.original = { |
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| 214 | x: dragEvent.x, |
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| 215 | y: dragEvent.y |
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| 216 | }; |
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| 217 | |
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| 218 | me.move(x, y); |
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| 219 | |
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| 220 | return me; |
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| 221 | |
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| 222 | }, |
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| 223 | |
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| 224 | // internal |
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| 225 | |
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| 226 | dragEvent: { |
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| 227 | started: false, |
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| 228 | x: 0, |
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| 229 | y: 0 |
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| 230 | }, |
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| 231 | |
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| 232 | initialize: function() { |
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| 233 | |
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| 234 | var me = this, |
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| 235 | element = me.element, |
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| 236 | handle = me.handle, |
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| 237 | style = element.style, |
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| 238 | compStyle = getStyle(element), |
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| 239 | options = me.options, |
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| 240 | transform = env.transform, |
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| 241 | oldTransform; |
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| 242 | |
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| 243 | // cache element dimensions (for performance) |
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| 244 | |
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| 245 | var _dimensions = me._dimensions = { |
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| 246 | height: element.offsetHeight, |
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| 247 | left: element.offsetLeft, |
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| 248 | top: element.offsetTop, |
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| 249 | width: element.offsetWidth |
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| 250 | }; |
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| 251 | |
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| 252 | // shift compositing over to the GPU if the browser supports it (for performance) |
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| 253 | |
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| 254 | if (options.useGPU && transform) { |
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| 255 | |
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| 256 | // concatenate to any existing transform |
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| 257 | // so we don't accidentally override it |
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| 258 | oldTransform = compStyle[transform]; |
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| 259 | |
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| 260 | if (oldTransform === 'none') { |
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| 261 | oldTransform = ''; |
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| 262 | } |
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| 263 | |
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| 264 | style[transform] = oldTransform + ' translate3d(0,0,0)'; |
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| 265 | } |
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| 266 | |
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| 267 | // optional styling |
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| 268 | |
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| 269 | if (options.setPosition) { |
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| 270 | style.display = 'block'; |
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| 271 | style.left = _dimensions.left + 'px'; |
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| 272 | style.top = _dimensions.top + 'px'; |
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| 273 | style.bottom = style.right = 'auto'; |
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| 274 | style.margin = 0; |
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| 275 | style.position = 'absolute'; |
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| 276 | } |
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| 277 | |
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| 278 | if (options.setCursor) { |
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| 279 | style.cursor = 'move'; |
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| 280 | } |
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| 281 | |
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| 282 | // set limit |
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| 283 | me.setLimit(options.limit); |
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| 284 | |
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| 285 | // set position in model |
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| 286 | util.assign(me.dragEvent, { |
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| 287 | x: _dimensions.left, |
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| 288 | y: _dimensions.top |
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| 289 | }); |
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| 290 | |
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| 291 | // attach mousedown event |
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| 292 | util.on(me.handle, me.handlers.start); |
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| 293 | |
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| 294 | }, |
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| 295 | |
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| 296 | start: function (e) { |
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| 297 | |
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| 298 | var me = this; |
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| 299 | var cursor = me.getCursor(e); |
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| 300 | var element = me.element; |
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| 301 | |
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| 302 | // filter the target? |
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| 303 | if (!me.useTarget(e.target || e.srcElement)) { |
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| 304 | return; |
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| 305 | } |
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| 306 | |
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| 307 | // prevent browsers from visually dragging the element's outline |
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| 308 | if (e.preventDefault) { |
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| 309 | e.preventDefault(); |
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| 310 | } else { |
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| 311 | e.returnValue = false; // IE10 |
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| 312 | } |
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| 313 | |
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| 314 | // set a high z-index, just in case |
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| 315 | me.dragEvent.oldZindex = element.style.zIndex; |
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| 316 | element.style.zIndex = 10000; |
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| 317 | |
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| 318 | // set initial position |
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| 319 | me.setCursor(cursor); |
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| 320 | me.setPosition(); |
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| 321 | me.setZoom(); |
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| 322 | |
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| 323 | // add event listeners |
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| 324 | util.on(document, me.handlers.move); |
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| 325 | |
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| 326 | }, |
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| 327 | |
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| 328 | drag: function (e) { |
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| 329 | |
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| 330 | var me = this, |
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| 331 | dragEvent = me.dragEvent, |
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| 332 | element = me.element, |
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| 333 | initialCursor = me._cursor, |
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| 334 | initialPosition = me._dimensions, |
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| 335 | options = me.options, |
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| 336 | zoom = initialPosition.zoom, |
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| 337 | cursor = me.getCursor(e), |
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| 338 | threshold = options.threshold, |
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| 339 | x = (cursor.x - initialCursor.x)/zoom + initialPosition.left, |
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| 340 | y = (cursor.y - initialCursor.y)/zoom + initialPosition.top; |
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| 341 | |
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| 342 | // check threshold |
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| 343 | if (!dragEvent.started && threshold && |
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| 344 | (Math.abs(initialCursor.x - cursor.x) < threshold) && |
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| 345 | (Math.abs(initialCursor.y - cursor.y) < threshold) |
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| 346 | ) { |
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| 347 | return; |
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| 348 | } |
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| 349 | |
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| 350 | // save original position? |
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| 351 | if (!dragEvent.original) { |
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| 352 | dragEvent.original = { x: x, y: y }; |
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| 353 | } |
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| 354 | |
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| 355 | // trigger start event? |
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| 356 | if (!dragEvent.started) { |
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| 357 | options.onDragStart(element, x, y, e); |
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| 358 | dragEvent.started = true; |
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| 359 | } |
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| 360 | |
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| 361 | // move the element |
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| 362 | if (me.move(x, y)) { |
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| 363 | |
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| 364 | // trigger drag event |
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| 365 | options.onDrag(element, dragEvent.x, dragEvent.y, e); |
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| 366 | } |
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| 367 | |
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| 368 | }, |
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| 369 | |
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| 370 | move: function (x, y) { |
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| 371 | |
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| 372 | var me = this, |
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| 373 | dragEvent = me.dragEvent, |
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| 374 | options = me.options, |
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| 375 | grid = options.grid, |
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| 376 | style = me.element.style, |
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| 377 | pos = me.limit(x, y, dragEvent.original.x, dragEvent.original.y); |
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| 378 | |
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| 379 | // snap to grid? |
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| 380 | if (!options.smoothDrag && grid) { |
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| 381 | pos = me.round (pos, grid); |
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| 382 | } |
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| 383 | |
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| 384 | // move it |
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| 385 | if (pos.x !== dragEvent.x || pos.y !== dragEvent.y) { |
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| 386 | |
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| 387 | dragEvent.x = pos.x; |
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| 388 | dragEvent.y = pos.y; |
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| 389 | style.left = pos.x + 'px'; |
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| 390 | style.top = pos.y + 'px'; |
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| 391 | |
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| 392 | return true; |
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| 393 | } |
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| 394 | |
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| 395 | return false; |
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| 396 | |
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| 397 | }, |
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| 398 | |
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| 399 | stop: function (e) { |
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| 400 | |
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| 401 | var me = this, |
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| 402 | dragEvent = me.dragEvent, |
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| 403 | element = me.element, |
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| 404 | options = me.options, |
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| 405 | grid = options.grid, |
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| 406 | pos; |
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| 407 | |
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| 408 | // remove event listeners |
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| 409 | util.off(document, me.handlers.move); |
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| 410 | |
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| 411 | // resent element's z-index |
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| 412 | element.style.zIndex = dragEvent.oldZindex; |
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| 413 | |
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| 414 | // snap to grid? |
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| 415 | if (options.smoothDrag && grid) { |
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| 416 | pos = me.round({ x: dragEvent.x, y: dragEvent.y }, grid); |
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| 417 | me.move(pos.x, pos.y); |
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| 418 | util.assign(me.dragEvent, pos); |
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| 419 | } |
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| 420 | |
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| 421 | // trigger dragend event |
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| 422 | if (me.dragEvent.started) { |
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| 423 | options.onDragEnd(element, dragEvent.x, dragEvent.y, e); |
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| 424 | } |
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| 425 | |
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| 426 | // clear temp vars |
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| 427 | me.reset(); |
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| 428 | |
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| 429 | }, |
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| 430 | |
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| 431 | reset: function() { |
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| 432 | |
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| 433 | this.dragEvent.started = false; |
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| 434 | |
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| 435 | }, |
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| 436 | |
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| 437 | round: function (pos) { |
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| 438 | |
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| 439 | var grid = this.options.grid; |
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| 440 | |
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| 441 | return { |
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| 442 | x: grid * Math.round(pos.x/grid), |
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| 443 | y: grid * Math.round(pos.y/grid) |
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| 444 | }; |
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| 445 | |
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| 446 | }, |
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| 447 | |
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| 448 | getCursor: function (e) { |
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| 449 | |
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| 450 | return { |
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| 451 | x: (e.targetTouches ? e.targetTouches[0] : e).clientX, |
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| 452 | y: (e.targetTouches ? e.targetTouches[0] : e).clientY |
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| 453 | }; |
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| 454 | |
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| 455 | }, |
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| 456 | |
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| 457 | setCursor: function (xy) { |
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| 458 | |
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| 459 | this._cursor = xy; |
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| 460 | |
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| 461 | }, |
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| 462 | |
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| 463 | setLimit: function (limit) { |
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| 464 | |
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| 465 | var me = this, |
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| 466 | _true = function (x, y) { |
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| 467 | return { x:x, y:y }; |
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| 468 | }; |
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| 469 | |
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| 470 | // limit is a function |
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| 471 | if (isFunction(limit)) { |
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| 472 | |
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| 473 | me.limit = limit; |
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| 474 | |
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| 475 | } |
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| 476 | |
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| 477 | // limit is an element |
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| 478 | else if (isElement(limit)) { |
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| 479 | |
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| 480 | var draggableSize = me._dimensions, |
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| 481 | height = limit.scrollHeight - draggableSize.height, |
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| 482 | width = limit.scrollWidth - draggableSize.width; |
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| 483 | |
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| 484 | me.limit = function (x, y) { |
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| 485 | return { |
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| 486 | x: util.limit(x, [0, width]), |
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| 487 | y: util.limit(y, [0, height]) |
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| 488 | } |
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| 489 | }; |
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| 490 | |
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| 491 | } |
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| 492 | |
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| 493 | // limit is defined |
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| 494 | else if (limit) { |
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| 495 | |
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| 496 | var defined = { |
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| 497 | x: isDefined(limit.x), |
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| 498 | y: isDefined(limit.y) |
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| 499 | }; |
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| 500 | var _x, _y; |
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| 501 | |
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| 502 | // {Undefined} limit.x, {Undefined} limit.y |
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| 503 | if (!defined.x && !defined.y) { |
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| 504 | |
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| 505 | me.limit = _true; |
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| 506 | |
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| 507 | } else { |
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| 508 | |
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| 509 | me.limit = function (x, y) { |
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| 510 | return { |
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| 511 | x: defined.x ? util.limit(x, limit.x) : x, |
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| 512 | y: defined.y ? util.limit(y, limit.y) : y |
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| 513 | }; |
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| 514 | }; |
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| 515 | |
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| 516 | } |
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| 517 | } |
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| 518 | |
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| 519 | // limit is `null` or `undefined` |
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| 520 | else { |
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| 521 | |
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| 522 | me.limit = _true; |
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| 523 | |
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| 524 | } |
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| 525 | |
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| 526 | }, |
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| 527 | |
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| 528 | setPosition: function() { |
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| 529 | |
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| 530 | var me = this, |
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| 531 | element = me.element, |
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| 532 | style = element.style; |
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| 533 | |
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| 534 | util.assign(me._dimensions, { |
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| 535 | left: parse(style.left) || element.offsetLeft, |
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| 536 | top: parse(style.top) || element.offsetTop |
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| 537 | }); |
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| 538 | |
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| 539 | }, |
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| 540 | |
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| 541 | setZoom: function() { |
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| 542 | |
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| 543 | var me = this; |
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| 544 | var element = me.element; |
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| 545 | var zoom = 1; |
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| 546 | |
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| 547 | while (element = element.offsetParent) { |
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| 548 | |
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| 549 | var z = getStyle(element).zoom; |
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| 550 | |
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| 551 | if (z && z !== 'normal') { |
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| 552 | zoom = z; |
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| 553 | break; |
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| 554 | } |
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| 555 | |
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| 556 | } |
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| 557 | |
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| 558 | me._dimensions.zoom = zoom; |
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| 559 | |
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| 560 | }, |
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| 561 | |
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| 562 | useTarget: function (element) { |
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| 563 | |
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| 564 | var filterTarget = this.options.filterTarget; |
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| 565 | |
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| 566 | if (filterTarget instanceof Function) { |
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| 567 | return filterTarget(element); |
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| 568 | } |
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| 569 | |
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| 570 | return true; |
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| 571 | |
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| 572 | }, |
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| 573 | |
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| 574 | destroy: function () { |
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| 575 | |
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| 576 | util.off(this.handle, this.handlers.start); |
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| 577 | util.off(document, this.handlers.move); |
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| 578 | |
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| 579 | } |
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| 580 | |
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| 581 | }); |
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| 582 | |
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| 583 | // helpers |
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| 584 | |
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| 585 | function parse (string) { |
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| 586 | return parseInt(string, 10); |
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| 587 | } |
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| 588 | |
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| 589 | function getStyle (element) { |
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| 590 | return 'currentStyle' in element ? element.currentStyle : getComputedStyle(element); |
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| 591 | } |
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| 592 | |
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| 593 | function isArray (thing) { |
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| 594 | return thing instanceof Array; // HTMLElement |
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| 595 | } |
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| 596 | |
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| 597 | function isDefined (thing) { |
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| 598 | return thing !== void 0 && thing !== null; |
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| 599 | } |
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| 600 | |
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| 601 | function isElement (thing) { |
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| 602 | return thing instanceof Element || typeof HTMLDocument !== 'undefined' && thing instanceof HTMLDocument; |
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| 603 | } |
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| 604 | |
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| 605 | function isFunction (thing) { |
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| 606 | return thing instanceof Function; |
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| 607 | } |
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| 608 | |
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| 609 | function noop (){}; |
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| 610 | |
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| 611 | return Draggable; |
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| 612 | |
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| 613 | })); |
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