https://cdn.gufo.me/js/tether.js

1/*! tether 1.4.0 */
2
3(function(root, factory) {
4  if (typeof define === 'function' && define.amd) {
5    define(factory);
6  } else if (typeof exports === 'object') {
7    module.exports = factory(require, exports, module);
8  } else {
9    root.Tether = factory();
10  }
11}(this, function(require, exports, module) {
12
13'use strict';
14
15var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();
16
17function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
18
19var TetherBase = undefined;
20if (typeof TetherBase === 'undefined') {
21  TetherBase = { modules: [] };
22}
23
24var zeroElement = null;
25
26// Same as native getBoundingClientRect, except it takes into account parent <frame> offsets
27// if the element lies within a nested document (<frame> or <iframe>-like).
28function getActualBoundingClientRect(node) {
29  var boundingRect = node.getBoundingClientRect();
30
31  // The original object returned by getBoundingClientRect is immutable, so we clone it
32  // We can't use extend because the properties are not considered part of the object by hasOwnProperty in IE9
33  var rect = {};
34  for (var k in boundingRect) {
35    rect[k] = boundingRect[k];
36  }
37
38  if (node.ownerDocument !== document) {
39    var _frameElement = node.ownerDocument.defaultView.frameElement;
40    if (_frameElement) {
41      var frameRect = getActualBoundingClientRect(_frameElement);
42      rect.top += frameRect.top;
43      rect.bottom += frameRect.top;
44      rect.left += frameRect.left;
45      rect.right += frameRect.left;
46    }
47  }
48
49  return rect;
50}
51
52function getScrollParents(el) {
53  // In firefox if the el is inside an iframe with display: none; window.getComputedStyle() will return null;
54  // https://bugzilla.mozilla.org/show_bug.cgi?id=548397
55  var computedStyle = getComputedStyle(el) || {};
56  var position = computedStyle.position;
57  var parents = [];
58
59  if (position === 'fixed') {
60    return [el];
61  }
62
63  var parent = el;
64  while ((parent = parent.parentNode) && parent && parent.nodeType === 1) {
65    var style = undefined;
66    try {
67      style = getComputedStyle(parent);
68    } catch (err) {}
69
70    if (typeof style === 'undefined' || style === null) {
71      parents.push(parent);
72      return parents;
73    }
74
75    var _style = style;
76    var overflow = _style.overflow;
77    var overflowX = _style.overflowX;
78    var overflowY = _style.overflowY;
79
80    if (/(auto|scroll)/.test(overflow + overflowY + overflowX)) {
81      if (position !== 'absolute' || ['relative', 'absolute', 'fixed'].indexOf(style.position) >= 0) {
82        parents.push(parent);
83      }
84    }
85  }
86
87  parents.push(el.ownerDocument.body);
88
89  // If the node is within a frame, account for the parent window scroll
90  if (el.ownerDocument !== document) {
91    parents.push(el.ownerDocument.defaultView);
92  }
93
94  return parents;
95}
96
97var uniqueId = (function () {
98  var id = 0;
99  return function () {
100    return ++id;
101  };
102})();
103
104var zeroPosCache = {};
105var getOrigin = function getOrigin() {
106  // getBoundingClientRect is unfortunately too accurate.  It introduces a pixel or two of
107  // jitter as the user scrolls that messes with our ability to detect if tw

107o positions
108  // are equivilant or not.  We place an element at the top left of the page that will
109  // get the same jitter, so we can cancel the two out.
110  var node = zeroElement;
111  if (!node || !document.body.contains(node)) {
112    node = document.createElement('div');
113    node.setAttribute('data-tether-id', uniqueId());
114    extend(node.style, {
115      top: 0,
116      left: 0,
117      position: 'absolute'
118    });
119
120    document.body.appendChild(node);
121
122    zeroElement = node;
123  }
124
125  var id = node.getAttribute('data-tether-id');
126  if (typeof zeroPosCache[id] === 'undefined') {
127    zeroPosCache[id] = getActualBoundingClientRect(node);
128
129    // Clear the cache when this position call is done
130    defer(function () {
131      delete zeroPosCache[id];
132    });
133  }
134
135  return zeroPosCache[id];
136};
137
138function removeUtilElements() {
139  if (zeroElement) {
140    document.body.removeChild(zeroElement);
141  }
142  zeroElement = null;
143};
144
145function getBounds(el) {
146  var doc = undefined;
147  if (el === document) {
148    doc = document;
149    el = document.documentElement;
150  } else {
151    doc = el.ownerDocument;
152  }
153
154  var docEl = doc.documentElement;
155
156  var box = getActualBoundingClientRect(el);
157
158  var origin = getOrigin();
159
160  box.top -= origin.top;
161  box.left -= origin.left;
162
163  if (typeof box.width === 'undefined') {
164    box.width = document.body.scrollWidth - box.left - box.right;
165  }
166  if (typeof box.height === 'undefined') {
167    box.height = document.body.scrollHeight - box.top - box.bottom;
168  }
169
170  box.top = box.top - docEl.clientTop;
171  box.left = box.left - docEl.clientLeft;
172  box.right = doc.body.clientWidth - box.width - box.left;
173  box.bottom = doc.body.clientHeight - box.height - box.top;
174
175  return box;
176}
177
178function getOffsetParent(el) {
179  return el.offsetParent || document.documentElement;
180}
181
182var _scrollBarSize = null;
183function getScrollBarSize() {
184  if (_scrollBarSize) {
185    return _scrollBarSize;
186  }
187  var inner = document.createElement('div');
188  inner.style.width = '100%';
189  inner.style.height = '200px';
190
191  var outer = document.createElement('div');
192  extend(outer.style, {
193    position: 'absolute',
194    top: 0,
195    left: 0,
196    pointerEvents: 'none',
197    visibility: 'hidden',
198    width: '200px',
199    height: '150px',
200    overflow: 'hidden'
201  });
202
203  outer.appendChild(inner);
204
205  document.body.appendChild(outer);
206
207  var widthContained = inner.offsetWidth;
208  outer.style.overflow = 'scroll';
209  var widthScroll = inner.offsetWidth;
210
211  if (widthContained === widthScroll) {
212    widthScroll = outer.clientWidth;
213  }
214
215  document.body.removeChild(outer);
216
217  var width = widthContained - widthScroll;
218
219  _scrollBarSize = { width: width, height: width };
220  return _scrollBarSize;
221}
222
223function extend() {
224  var out = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0];
225
226  var args = [];
227
228  Array.prototype.push.apply(args, arguments);
229
230  args.slice(1).forEach(function (obj) {
231    if (obj) {
232      for (var key in obj) {
233        if (({}).hasOwnProperty.call(obj, key)) {
234          out[key] = obj[key];
235        }
236      }
237    }
238  });
239
240  return out;
241}
242
243function removeClass(el, name) {
244  if (typeof el.classList !== 'undefined') {
245    name.split(' ').forEach(function (cls) {
246      if (cls.trim()) {
247        el.classList.remove(cls);
248      }
249    });
250  } else {
251    var regex = new RegExp('(^| )' + name.split(' ').join('|') + '( |$)', 'gi');
252    var className = getClassName(el).replace(regex, ' ');
253    setClassName(el, className);
254  }
255}
256
257function addClass(el, name) {
258  if (typeof el.classList !== 'undefined') {
259    name.split(' ').forEach(function (cls) {
260      if (cls.trim()) {
261        el.classList.add(cls);
262      }
263    });
264  } else {
265    removeClass(el, name);
266    var cls = getClassName(el) + (' ' + name);
267    setClassName(el, cls);
268  }
269}
270
271function hasClass(el, name) {
272  if (typeof el.classList !== 'undefined') {
273    return el.classList.contains(name);
274  }
275  var className = getClassName(el);
276  return new RegExp('(^| )' + name + '( |$)', 'gi').test(className);
277}
278
279function getClassName(el) {
280  // Can't use just SVGAnimatedString here since nodes within a Frame in IE have
281  // completely separately SVGAnimatedString base classes
282  if (el.className instanceof el.ownerDocument.defaultView.SVGAnimatedString) {
283    return el.className.baseVal;
284  }
285  return el.className;
286}
287
288function setClassName(el, className) {
289  el.setAttribute('class', className);
290}
291
292function updateClasses(el, add, all) {
293  // Of the set of 'all' classes, we need the 'add' classes, and only the
294  // 'add' classes to be set.
295  all.forEach(function (cls) {
296    if (add.indexOf(cls) === -1 && hasClass(el, cls)) {
297      removeClass(el, cls);
298    }
299  });
300

301  add.forEach(function (cls) {
302    if (!hasClass(el, cls)) {
303      addClass(el, cls);
304    }
305  });
306}
307
308var deferred = [];
309
310var defer = function defer(fn) {
311  deferred.push(fn);
312};
313
314var flush = function flush() {
315  var fn = undefined;
316  while (fn = deferred.pop()) {
317    fn();
318  }
319};
320
321var Evented = (function () {
322  function Evented() {
323    _classCallCheck(this, Evented);
324  }
325
326  _createClass(Evented, [{
327    key: 'on',
328    value: function on(event, handler, ctx) {
329      var once = arguments.length <= 3 || arguments[3] === undefined ? false : arguments[3];
330
331      if (typeof this.bindings === 'undefined') {
332        this.bindings = {};
333      }
334      if (typeof this.bindings[event] === 'undefined') {
335        this.bindings[event] = [];
336      }
337      this.bindings[event].push({ handler: handler, ctx: ctx, once: once });
338    }
339  }, {
340    key: 'once',
341    value: function once(event, handler, ctx) {
342      this.on(event, handler, ctx, true);
343    }
344  }, {
345    key: 'off',
346    value: function off(event, handler) {
347      if (typeof this.bindings === 'undefined' || typeof this.bindings[event] === 'undefined') {
348        return;
349      }
350
351      if (typeof handler === 'undefined') {
352        delete this.bindings[event];
353      } else {
354        var i = 0;
355        while (i < this.bindings[event].length) {
356          if (this.bindings[event][i].handler === handler) {
357            this.bindings[event].splice(i, 1);
358          } else {
359            ++i;
360          }
361        }
362      }
363    }
364  }, {
365    key: 'trigger',
366    value: function trigger(event) {
367      if (typeof this.bindings !== 'undefined' && this.bindings[event]) {
368        var i = 0;
369
370        for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
371          args[_key - 1] = arguments[_key];
372        }
373
374        while (i < this.bindings[event].length) {
375          var _bindings$event$i = this.bindings[event][i];
376          var handler = _bindings$event$i.handler;
377          var ctx = _bindings$event$i.ctx;
378          var once = _bindings$event$i.once;
379
380          var context = ctx;
381          if (typeof context === 'undefined') {
382            context = this;
383          }
384
385          handler.apply(context, args);
386
387          if (once) {
388            this.bindings[event].splice(i, 1);
389          } else {
390            ++i;
391          }
392        }
393      }
394    }
395  }]);
396
397  return Evented;
398})();
399
400TetherBase.Utils = {
401  getActualBoundingClientRect: getActualBoundingClientRect,
402  getScrollParents: getScrollParents,
403  getBounds: getBounds,
404  getOffsetParent: getOffsetParent,
405  extend: extend,
406  addClass: addClass,
407  removeClass: removeClass,
408  hasClass: hasClass,
409  updateClasses: updateClasses,
410  defer: defer,
411  flush: flush,
412  uniqueId: uniqueId,
413  Evented: Evented,
414  getScrollBarSize: getScrollBarSize,
415  removeUtilElements: removeUtilElements
416};
417/* globals TetherBase, performance */
418
419'use strict';
420
421var _slicedToArray = (function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i['return']) _i['return'](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError('Invalid attempt to destructure non-iterable instance'); } }; })();
422
423var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();
424
425var _get = function get(_x6, _x7, _x8) { var _again = true; _function: while (_again) { var object = _x6, property = _x7, receiver = _x8; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x6 = parent; _x7 = property; _x8 = receiver; _again = true; desc = parent = undefined; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };
426
427function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
428
429function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { c

429onstructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
430
431if (typeof TetherBase === 'undefined') {
432  throw new Error('You must include the utils.js file before tether.js');
433}
434
435var _TetherBase$Utils = TetherBase.Utils;
436var getScrollParents = _TetherBase$Utils.getScrollParents;
437var getBounds = _TetherBase$Utils.getBounds;
438var getOffsetParent = _TetherBase$Utils.getOffsetParent;
439var extend = _TetherBase$Utils.extend;
440var addClass = _TetherBase$Utils.addClass;
441var removeClass = _TetherBase$Utils.removeClass;
442var updateClasses = _TetherBase$Utils.updateClasses;
443var defer = _TetherBase$Utils.defer;
444var flush = _TetherBase$Utils.flush;
445var getScrollBarSize = _TetherBase$Utils.getScrollBarSize;
446var removeUtilElements = _TetherBase$Utils.removeUtilElements;
447
448function within(a, b) {
449  var diff = arguments.length <= 2 || arguments[2] === undefined ? 1 : arguments[2];
450
451  return a + diff >= b && b >= a - diff;
452}
453
454var transformKey = (function () {
455  if (typeof document === 'undefined') {
456    return '';
457  }
458  var el = document.createElement('div');
459
460  var transforms = ['transform', 'WebkitTransform', 'OTransform', 'MozTransform', 'msTransform'];
461  for (var i = 0; i < transforms.length; ++i) {
462    var key = transforms[i];
463    if (el.style[key] !== undefined) {
464      return key;
465    }
466  }
467})();
468
469var tethers = [];
470
471var position = function position() {
472  tethers.forEach(function (tether) {
473    tether.position(false);
474  });
475  flush();
476};
477
478function now() {
479  if (typeof performance !== 'undefined' && typeof performance.now !== 'undefined') {
480    return performance.now();
481  }
482  return +new Date();
483}
484
485(function () {
486  var lastCall = null;
487  var lastDuration = null;
488  var pendingTimeout = null;
489
490  var tick = function tick() {
491    if (typeof lastDuration !== 'undefined' && lastDuration > 16) {
492      // We voluntarily throttle ourselves if we can't manage 60fps
493      lastDuration = Math.min(lastDuration - 16, 250);
494
495      // Just in case this is the last event, remember to position just once more
496      pendingTimeout = setTimeout(tick, 250);
497      return;
498    }
499
500    if (typeof lastCall !== 'undefined' && now() - lastCall < 10) {
501      // Some browsers call events a little too frequently, refuse to run more than is reasonable
502      return;
503    }
504
505    if (pendingTimeout != null) {
506      clearTimeout(pendingTimeout);
507      pendingTimeout = null;
508    }
509
510    lastCall = now();
511    position();
512    lastDuration = now() - lastCall;
513  };
514
515  if (typeof window !== 'undefined' && typeof window.addEventListener !== 'undefined') {
516    ['resize', 'scroll', 'touchmove'].forEach(function (event) {
517      window.addEventListener(event, tick);
518    });
519  }
520})();
521
522var MIRROR_LR = {
523  center: 'center',
524  left: 'right',
525  right: 'left'
526};
527
528var MIRROR_TB = {
529  middle: 'middle',
530  top: 'bottom',
531  bottom: 'top'
532};
533
534var OFFSET_MAP = {
535  top: 0,
536  left: 0,
537  middle: '50%',
538  center: '50%',
539  bottom: '100%',
540  right: '100%'
541};
542
543var autoToFixedAttachment = function autoToFixedAttachment(attachment, relativeToAttachment) {
544  var left = attachment.left;
545  var top = attachment.top;
546
547  if (left === 'auto') {
548    left = MIRROR_LR[relativeToAttachment.left];
549  }
550
551  if (top === 'auto') {
552    top = MIRROR_TB[relativeToAttachment.top];
553  }
554
555  return { left: left, top: top };
556};
557
558var attachmentToOffset = function attachmentToOffset(attachment) {
559  var left = attachment.left;
560  var top = attachment.top;
561
562  if (typeof OFFSET_MAP[attachment.left] !== 'undefined') {
563    left = OFFSET_MAP[attachment.left];
564  }
565
566  if (typeof OFFSET_MAP[attachment.top] !== 'undefined') {
567    top = OFFSET_MAP[attachment.top];
568  }
569
570  return { left: left, top: top };
571};
572
573function addOffset() {
574  var out = { top: 0, left: 0 };
575
576  for (var _len = arguments.length, offsets = Array(_len), _key = 0; _key < _len; _key++) {
577    offsets[_key] = arguments[_key];
578  }
579
580  offsets.forEach(function (_ref) {
581    var top = _ref.top;
582    var left = _ref.left;
583
584    if (typeof top === 'string') {
585      top = parseFloat(top, 10);
586    }
587    if (typeof left === 'string') {
588      left = parseFloat(left, 10);
589    }
590
591    out.top += top;
592    out.left += left;
593  });
594
595  return out;
596}
597
598function offsetToPx(offset, size) {
599  if (typeof offset.left === 'string' && offset.left.indexOf('%') !== -1) {
600    offset.left = parseFloat(offset.left, 10) / 100 * size.width;
601  }
602  if (typeof offset.top === 'string' && offset.top.indexOf('%') !== -1) {
603    offset.top = parseFloat(offset.top, 10) / 100 * size.height;
604  }
605
606  return offset;
607}
608
609var parseOffset = function parseOffset(value) {
610  var _value$split = value.split(' ');
611
612  var _value$split2 = _slicedToArray(_value$split, 2);
613
614  var top = _value$split2[0];
615  var left = _value$split2[1];
616
617  return { top: top, left: left };
618};
619var parseAttachment = parseOffset;
620
621var TetherClass = (function (_Evented) {
622  _inherits(TetherClass, _Evented);
623
624  function TetherClass(options) {
625    var _this = this;
626
627    _classCallCheck(this, TetherClass);
628
629    _get(Object.getPrototypeOf(TetherClass.prototype), 'constructor', this).call(this);
630    this.position = this.position.bind(this);
631
632    tethers.push(this);
633
634    this.history = [];
635
636    this.setOptions(options, false);
637

638    TetherBase.modules.forEach(function (module) {
639      if (typeof module.initialize !== 'undefined') {
640        module.initialize.call(_this);
641      }
642    });
643
644    this.position();
645  }
646
647  _createClass(TetherClass, [{
648    key: 'getClass',
649    value: function getClass() {
650      var key = arguments.length <= 0 || arguments[0] === undefined ? '' : arguments[0];
651      var classes = this.options.classes;
652
653      if (typeof classes !== 'undefined' && classes[key]) {
654        return this.options.classes[key];
655      } else if (this.options.classPrefix) {
656        return this.options.classPrefix + '-' + key;
657      } else {
658        return key;
659      }
660    }
661  }, {
662    key: 'setOptions',
663    value: function setOptions(options) {
664      var _this2 = this;
665
666      var pos = arguments.length <= 1 || arguments[1] === undefined ? true : arguments[1];
667
668      var defaults = {
669        offset: '0 0',
670        targetOffset: '0 0',
671        targetAttachment: 'auto auto',
672        classPrefix: 'tether'
673      };
674
675      this.options = extend(defaults, options);
676
677      var _options = this.options;
678      var element = _options.element;
679      var target = _options.target;
680      var targetModifier = _options.targetModifier;
681
682      this.element = element;
683      this.target = target;
684      this.targetModifier = targetModifier;
685
686      if (this.target === 'viewport') {
687        this.target = document.body;
688        this.targetModifier = 'visible';
689      } else if (this.target === 'scroll-handle') {
690        this.target = document.body;
691        this.targetModifier = 'scroll-handle';
692      }
693
694      ['element', 'target'].forEach(function (key) {
695        if (typeof _this2[key] === 'undefined') {
696          throw new Error('Tether Error: Both element and target must be defined');
697        }
698
699        if (typeof _this2[key].jquery !== 'undefined') {
700          _this2[key] = _this2[key][0];
701        } else if (typeof _this2[key] === 'string') {
702          _this2[key] = document.querySelector(_this2[key]);
703        }
704      });
705
706      addClass(this.element, this.getClass('element'));
707      if (!(this.options.addTargetClasses === false)) {
708        addClass(this.target, this.getClass('target'));
709      }
710
711      if (!this.options.attachment) {
712        throw new Error('Tether Error: You must provide an attachment');
713      }
714
715      this.targetAttachment = parseAttachment(this.options.targetAttachment);
716      this.attachment = parseAttachment(this.options.attachment);
717      this.offset = parseOffset(this.options.offset);
718      this.targetOffset = parseOffset(this.options.targetOffset);
719
720      if (typeof this.scrollParents !== 'undefined') {
721        this.disable();
722      }
723
724      if (this.targetModifier === 'scroll-handle') {
725        this.scrollParents = [this.target];
726      } else {
727        this.scrollParents = getScrollParents(this.target);
728      }
729
730      if (!(this.options.enabled === false)) {
731        this.enable(pos);
732      }
733    }
734  }, {
735    key: 'getTargetBounds',
736    value: function getTargetBounds() {
737      if (typeof this.targetModifier !== 'undefined') {
738        if (this.targetModifier === 'visible') {
739          if (this.target === document.body) {
740            return { top: pageYOffset, left: pageXOffset, height: innerHeight, width: innerWidth };
741          } else {
742            var bounds = getBounds(this.target);
743
744            var out = {
745              height: bounds.height,
746              width: bounds.width,
747              top: bounds.top,
748              left: bounds.left
749            };
750
751            out.height = Math.min(out.height, bounds.height - (pageYOffset - bounds.top));
752            out.height = Math.min(out.height, bounds.height - (bounds.top + bounds.height - (pageYOffset + innerHeight)));
753            out.height = Math.min(innerHeight, out.height);
754            out.height -= 2;
755
756            out.width = Math.min(out.width, bounds.width - (pageXOffset - bounds.left));
757            out.width = Math.min(out.width, bounds.width - (bounds.left + bounds.width - (pageXOffset + innerWidth)));
758            out.width = Math.min(innerWidth, out.width);
759            out.width -= 2;
760
761            if (out.top < pageYOffset) {
762              out.top = pageYOffset;
763            }
764            if (out.left < pageXOffset) {
765              out.left = pageXOffset;
766            }
767
768            return out;
769          }
770        } else if (this.targetModifier === 'scroll-handle') {
771          var bounds = undefined;
772          var target = this.target;
773          if (target === document.body) {
774            target = document.documentElement;
775
776            bounds = {
777              left: pageXOffset,
778              top: pageYOffset,

779              height: innerHeight,
780              width: innerWidth
781            };
782          } else {
783            bounds = getBounds(target);
784          }
785
786          var style = getComputedStyle(target);
787
788          var hasBottomScroll = target.scrollWidth > target.clientWidth || [style.overflow, style.overflowX].indexOf('scroll') >= 0 || this.target !== document.body;
789
790          var scrollBottom = 0;
791          if (hasBottomScroll) {
792            scrollBottom = 15;
793          }
794
795          var height = bounds.height - parseFloat(style.borderTopWidth) - parseFloat(style.borderBottomWidth) - scrollBottom;
796
797          var out = {
798            width: 15,
799            height: height * 0.975 * (height / target.scrollHeight),
800            left: bounds.left + bounds.width - parseFloat(style.borderLeftWidth) - 15
801          };
802
803          var fitAdj = 0;
804          if (height < 408 && this.target === document.body) {
805            fitAdj = -0.00011 * Math.pow(height, 2) - 0.00727 * height + 22.58;
806          }
807
808          if (this.target !== document.body) {
809            out.height = Math.max(out.height, 24);
810          }
811
812          var scrollPercentage = this.target.scrollTop / (target.scrollHeight - height);
813          out.top = scrollPercentage * (height - out.height - fitAdj) + bounds.top + parseFloat(style.borderTopWidth);
814
815          if (this.target === document.body) {
816            out.height = Math.max(out.height, 24);
817          }
818
819          return out;
820        }
821      } else {
822        return getBounds(this.target);
823      }
824    }
825  }, {
826    key: 'clearCache',
827    value: function clearCache() {
828      this._cache = {};
829    }
830  }, {
831    key: 'cache',
832    value: function cache(k, getter) {
833      // More than one module will often need the same DOM info, so
834      // we keep a cache which is cleared on each position call
835      if (typeof this._cache === 'undefined') {
836        this._cache = {};
837      }
838
839      if (typeof this._cache[k] === 'undefined') {
840        this._cache[k] = getter.call(this);
841      }
842
843      return this._cache[k];
844    }
845  }, {
846    key: 'enable',
847    value: function enable() {
848      var _this3 = this;
849
850      var pos = arguments.length <= 0 || arguments[0] === undefined ? true : arguments[0];
851
852      if (!(this.options.addTargetClasses === false)) {
853        addClass(this.target, this.getClass('enabled'));
854      }
855      addClass(this.element, this.getClass('enabled'));
856      this.enabled = true;
857
858      this.scrollParents.forEach(function (parent) {
859        if (parent !== _this3.target.ownerDocument) {
860          parent.addEventListener('scroll', _this3.position);
861        }
862      });
863
864      if (pos) {
865        this.position();
866      }
867    }
868  }, {
869    key: 'disable',
870    value: function disable() {
871      var _this4 = this;
872
873      removeClass(this.target, this.getClass('enabled'));
874      removeClass(this.element, this.getClass('enabled'));
875      this.enabled = false;
876
877      if (typeof this.scrollParents !== 'undefined') {
878        this.scrollParents.forEach(function (parent) {
879          parent.removeEventListener('scroll', _this4.position);
880        });
881      }
882    }
883  }, {
884    key: 'destroy',
885    value: function destroy() {
886      var _this5 = this;
887
888      this.disable();
889
890      tethers.forEach(function (tether, i) {
891        if (tether === _this5) {
892          tethers.splice(i, 1);
893        }
894      });
895
896      // Remove any elements we were using for convenience from the DOM
897      if (tethers.length === 0) {
898        removeUtilElements();
899      }
900    }
901  }, {
902    key: 'updateAttachClasses',
903    value: function updateAttachClasses(elementAttach, targetAttach) {
904      var _this6 = this;
905
906      elementAttach = elementAttach || this.attachment;
907      targetAttach = targetAttach || this.targetAttachment;
908      var sides = ['left', 'top', 'bottom', 'right', 'middle', 'center'];
909
910      if (typeof this._addAttachClasses !== 'undefined' && this._addAttachClasses.length) {
911        // updateAttachClasses can be called more than once in a position call, so
912        // we need to clean up after ourselves such that when the last defer gets
913        // ran it doesn't add any extra classes from previous calls.
914        this._addAttachClasses.splice(0, this._addAttachClasses.length);
915      }
916
917      if (typeof this._addAttachClasses === 'undefined') {
918        this._addAttachClasses = [];
919      }
920      var add = this._addAttachClasses;
921
922      if (elementAttach.top) {
923        add.push(this.getClass('element-attached') + '-' + elementAttach.top);
924      }
925      if (elementAttach.left) {
926        add.push(this.getClass('element-attached') + '-' + elementAttach.left);
927      }
928      if (targetAttach.top) {
929        add.push(this.getClass('target-attached') + '-' + targetAttach.top);
930      }
931      if (targetAttach.left) {
932        add.push(this.getClass('target-attached') + '-' + targetAttach.left);
933      }
934
935      var all = [];

936      sides.forEach(function (side) {
937        all.push(_this6.getClass('element-attached') + '-' + side);
938        all.push(_this6.getClass('target-attached') + '-' + side);
939      });
940
941      defer(function () {
942        if (!(typeof _this6._addAttachClasses !== 'undefined')) {
943          return;
944        }
945
946        updateClasses(_this6.element, _this6._addAttachClasses, all);
947        if (!(_this6.options.addTargetClasses === false)) {
948          updateClasses(_this6.target, _this6._addAttachClasses, all);
949        }
950
951        delete _this6._addAttachClasses;
952      });
953    }
954  }, {
955    key: 'position',
956    value: function position() {
957      var _this7 = this;
958
959      var flushChanges = arguments.length <= 0 || arguments[0] === undefined ? true : arguments[0];
960
961      // flushChanges commits the changes immediately, leave true unless you are positioning multiple
962      // tethers (in which case call Tether.Utils.flush yourself when you're done)
963
964      if (!this.enabled) {
965        return;
966      }
967
968      this.clearCache();
969
970      // Turn 'auto' attachments into the appropriate corner or edge
971      var targetAttachment = autoToFixedAttachment(this.targetAttachment, this.attachment);
972
973      this.updateAttachClasses(this.attachment, targetAttachment);
974
975      var elementPos = this.cache('element-bounds', function () {
976        return getBounds(_this7.element);
977      });
978
979      var width = elementPos.width;
980      var height = elementPos.height;
981
982      if (width === 0 && height === 0 && typeof this.lastSize !== 'undefined') {
983        var _lastSize = this.lastSize;
984
985        // We cache the height and width to make it possible to position elements that are
986        // getting hidden.
987        width = _lastSize.width;
988        height = _lastSize.height;
989      } else {
990        this.lastSize = { width: width, height: height };
991      }
992
993      var targetPos = this.cache('target-bounds', function () {
994        return _this7.getTargetBounds();
995      });
996      var targetSize = targetPos;
997
998      // Get an actual px offset from the attachment
999      var offset = offsetToPx(attachmentToOffset(this.attachment), { width: width, height: height });
1000      var targetOffset = offsetToPx(attachmentToOffset(targetAttachment), targetSize);
1001
1002      var manualOffset = offsetToPx(this.offset, { width: width, height: height });
1003      var manualTargetOffset = offsetToPx(this.targetOffset, targetSize);
1004
1005      // Add the manually provided offset
1006      offset = addOffset(offset, manualOffset);
1007      targetOffset = addOffset(targetOffset, manualTargetOffset);
1008
1009      // It's now our goal to make (element position + offset) == (target position + target offset)
1010      var left = targetPos.left + targetOffset.left - offset.left;
1011      var top = targetPos.top + targetOffset.top - offset.top;
1012
1013      for (var i = 0; i < TetherBase.modules.length; ++i) {
1014        var _module2 = TetherBase.modules[i];
1015        var ret = _module2.position.call(this, {
1016          left: left,
1017          top: top,
1018          targetAttachment: targetAttachment,
1019          targetPos: targetPos,
1020          elementPos: elementPos,
1021          offset: offset,
1022          targetOffset: targetOffset,
1023          manualOffset: manualOffset,
1024          manualTargetOffset: manualTargetOffset,
1025          scrollbarSize: scrollbarSize,
1026          attachment: this.attachment
1027        });
1028
1029        if (ret === false) {
1030          return false;
1031        } else if (typeof ret === 'undefined' || typeof ret !== 'object') {
1032          continue;
1033        } else {
1034          top = ret.top;
1035          left = ret.left;
1036        }
1037      }
1038
1039      // We describe the position three different ways to give the optimizer
1040      // a chance to decide the best possible way to position the element
1041      // with the fewest repaints.
1042      var next = {
1043        // It's position relative to the page (absolute positioning when
1044        // the element is a child of the body)
1045        page: {
1046          top: top,
1047          left: left
1048        },
1049
1050        // It's position relative to the viewport (fixed positioning)
1051        viewport: {
1052          top: top - pageYOffset,

1053          bottom: pageYOffset - top - height + innerHeight,
1054          left: left - pageXOffset,
1055          right: pageXOffset - left - width + innerWidth
1056        }
1057      };
1058
1059      var doc = this.target.ownerDocument;
1060      var win = doc.defaultView;
1061
1062      var scrollbarSize = undefined;
1063      if (win.innerHeight > doc.documentElement.clientHeight) {
1064        scrollbarSize = this.cache('scrollbar-size', getScrollBarSize);
1065        next.viewport.bottom -= scrollbarSize.height;
1066      }
1067
1068      if (win.innerWidth > doc.documentElement.clientWidth) {
1069        scrollbarSize = this.cache('scrollbar-size', getScrollBarSize);
1070        next.viewport.right -= scrollbarSize.width;
1071      }
1072
1073      if (['', 'static'].indexOf(doc.body.style.position) === -1 || ['', 'static'].indexOf(doc.body.parentElement.style.position) === -1) {
1074        // Absolute positioning in the body will be relative to the page, not the 'initial containing block'
1075        next.page.bottom = doc.body.scrollHeight - top - height;
1076        next.page.right = doc.body.scrollWidth - left - width;
1077      }
1078
1079      if (typeof this.options.optimizations !== 'undefined' && this.options.optimizations.moveElement !== false && !(typeof this.targetModifier !== 'undefined')) {
1080        (function () {
1081          var offsetParent = _this7.cache('target-offsetparent', function () {
1082            return getOffsetParent(_this7.target);
1083          });
1084          var offsetPosition = _this7.cache('target-offsetparent-bounds', function () {
1085            return getBounds(offsetParent);
1086          });
1087          var offsetParentStyle = getComputedStyle(offsetParent);
1088          var offsetParentSize = offsetPosition;
1089
1090          var offsetBorder = {};
1091          ['Top', 'Left', 'Bottom', 'Right'].forEach(function (side) {
1092            offsetBorder[side.toLowerCase()] = parseFloat(offsetParentStyle['border' + side + 'Width']);
1093          });
1094
1095          offsetPosition.right = doc.body.scrollWidth - offsetPosition.left - offsetParentSize.width + offsetBorder.right;
1096          offsetPosition.bottom = doc.body.scrollHeight - offsetPosition.top - offsetParentSize.height + offsetBorder.bottom;
1097
1098          if (next.page.top >= offsetPosition.top + offsetBorder.top && next.page.bottom >= offsetPosition.bottom) {
1099            if (next.page.left >= offsetPosition.left + offsetBorder.left && next.page.right >= offsetPosition.right) {
1100              // We're within the visible part of the target's scroll parent
1101              var scrollTop = offsetParent.scrollTop;
1102              var scrollLeft = offsetParent.scrollLeft;
1103
1104              // It's position relative to the target's offset parent (absolute positioning when
1105              // the element is moved to be a child of the target's offset parent).
1106              next.offset = {
1107                top: next.page.top - offsetPosition.top + scrollTop - offsetBorder.top,
1108                left: next.page.left - offsetPosition.left + scrollLeft - offsetBorder.left
1109              };
1110            }
1111          }
1112        })();
1113      }
1114
1115      // We could also travel up the DOM and try each containing context, rather than only
1116      // looking at the body, but we're gonna get diminishing returns.
1117
1118      this.move(next);
1119
1120      this.history.unshift(next);
1121
1122      if (this.history.length > 3) {
1123        this.history.pop();
1124      }
1125
1126      if (flushChanges) {
1127        flush();
1128      }
1129
1130      return true;
1131    }
1132
1133    // THE ISSUE
1134  }, {
1135    key: 'move',
1136    value: function move(pos) {
1137      var _this8 = this;
1138
1139      if (!(typeof this.element.parentNode !== 'undefined')) {
1140        return;
1141      }
1142
1143      var same = {};
1144
1145      for (var type in pos) {
1146        same[type] = {};
1147
1148        for (var key in pos[type]) {
1149          var found = false;
1150
1151          for (var i = 0; i < this.history.length; ++i) {
1152            var point = this.history[i];
1153            if (typeof point[type] !== 'undefined' && !within(point[type][key], pos[type][key])) {
1154              found = true;
1155              break;
1156            }
1157          }
1158
1159          if (!found) {
1160            same[type][key] = true;
1161          }
1162        }
1163      }
1164
1165      var css = { top: '', left: '', right: '', bottom: '' };
1166

1167      var transcribe = function transcribe(_same, _pos) {
1168        var hasOptimizations = typeof _this8.options.optimizations !== 'undefined';
1169        var gpu = hasOptimizations ? _this8.options.optimizations.gpu : null;
1170        if (gpu !== false) {
1171          var yPos = undefined,
1172              xPos = undefined;
1173          if (_same.top) {
1174            css.top = 0;
1175            yPos = _pos.top;
1176          } else {
1177            css.bottom = 0;
1178            yPos = -_pos.bottom;
1179          }
1180
1181          if (_same.left) {
1182            css.left = 0;
1183            xPos = _pos.left;
1184          } else {
1185            css.right = 0;
1186            xPos = -_pos.right;
1187          }
1188
1189          if (window.matchMedia) {
1190            // HubSpot/tether#207
1191            var retina = window.matchMedia('only screen and (min-resolution: 1.3dppx)').matches || window.matchMedia('only screen and (-webkit-min-device-pixel-ratio: 1.3)').matches;
1192            if (!retina) {
1193              xPos = Math.round(xPos);
1194              yPos = Math.round(yPos);
1195            }
1196          }
1197
1198          css[transformKey] = 'translateX(' + xPos + 'px) translateY(' + yPos + 'px)';
1199
1200          if (transformKey !== 'msTransform') {
1201            // The Z transform will keep this in the GPU (faster, and prevents artifacts),
1202            // but IE9 doesn't support 3d transforms and will choke.
1203            css[transformKey] += " translateZ(0)";
1204          }
1205        } else {

1206          if (_same.top) {
1207            css.top = _pos.top + 'px';
1208          } else {
1209            css.bottom = _pos.bottom + 'px';
1210          }
1211
1212          if (_same.left) {
1213            css.left = _pos.left + 'px';
1214          } else {
1215            css.right = _pos.right + 'px';
1216          }
1217        }
1218      };
1219
1220      var moved = false;
1221      if ((same.page.top || same.page.bottom) && (same.page.left || same.page.right)) {
1222        css.position = 'absolute';
1223        transcribe(same.page, pos.page);
1224      } else if ((same.viewport.top || same.viewport.bottom) && (same.viewport.left || same.viewport.right)) {
1225        css.position = 'fixed';
1226        transcribe(same.viewport, pos.viewport);
1227      } else if (typeof same.offset !== 'undefined' && same.offset.top && same.offset.left) {
1228        (function () {
1229          css.position = 'absolute';
1230          var offsetParent = _this8.cache('target-offsetparent', function () {
1231            return getOffsetParent(_this8.target);
1232          });
1233
1234          if (getOffsetParent(_this8.element) !== offsetParent) {
1235            defer(function () {
1236              _this8.element.parentNode.removeChild(_this8.element);
1237              offsetParent.appendChild(_this8.element);
1238            });
1239          }
1240
1241          transcribe(same.offset, pos.offset);
1242          moved = true;
1243        })();
1244      } else {
1245        css.position = 'absolute';
1246        transcribe({ top: true, left: true }, pos.page);
1247      }
1248
1249      if (!moved) {
1250        if (this.options.bodyElement) {
1251          this.options.bodyElement.appendChild(this.element);
1252        } else {
1253          var offsetParentIsBody = true;
1254          var currentNode = this.element.parentNode;
1255          while (currentNode && currentNode.nodeType === 1 && currentNode.tagName !== 'BODY') {
1256            if (getComputedStyle(currentNode).position !== 'static') {
1257              offsetParentIsBody = false;
1258              break;
1259            }
1260
1261            currentNode = currentNode.parentNode;
1262          }
1263
1264          if (!offsetParentIsBody) {
1265            this.element.parentNode.removeChild(this.element);
1266            this.element.ownerDocument.body.appendChild(this.element);
1267          }
1268        }
1269      }
1270
1271      // Any css change will trigger a repaint, so let's avoid one if nothing changed
1272      var writeCSS = {};
1273      var write = false;
1274      for (var key in css) {
1275        var val = css[key];
1276        var elVal = this.element.style[key];
1277
1278        if (elVal !== val) {
1279          write = true;
1280          writeCSS[key] = val;
1281        }
1282      }
1283
1284      if (write) {
1285        defer(function () {
1286          extend(_this8.element.style, writeCSS);
1287          _this8.trigger('repositioned');
1288        });
1289      }
1290    }
1291  }]);
1292
1293  return TetherClass;
1294})(Evented);
1295
1296TetherClass.modules = [];
1297
1298TetherBase.position = position;
1299
1300var Tether = extend(TetherClass, TetherBase);
1301/* globals TetherBase */
1302
1303'use strict';
1304
1305var _slicedToArray = (function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i['return']) _i['return'](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError('Invalid attempt to destructure non-iterable instance'); } }; })();
1306
1307var _TetherBase$Utils = TetherBase.Utils;
1308var getBounds = _TetherBase$Utils.getBounds;
1309var extend = _TetherBase$Utils.extend;
1310var updateClasses = _TetherBase$Utils.updateClasses;
1311var defer = _TetherBase$Utils.defer;
1312
1313var BOUNDS_FORMAT = ['left', 'top', 'right', 'bottom'];
1314
1315function getBoundingRect(tether, to) {
1316  if (to === 'scrollParent') {
1317    to = tether.scrollParents[0];
1318  } else if (to === 'window') {
1319    to = [pageXOffset, pageYOffset, innerWidth + pageXOffset, innerHeight + pageYOffset];
1320  }
1321
1322  if (to === document) {
1323    to = to.documentElement;
1324  }
1325
1326  if (typeof to.nodeType !== 'undefined') {
1327    (function () {
1328      var node = to;
1329      var size = getBounds(to);
1330      var pos = size;
1331      var style = getComputedStyle(to);
1332
1333      to = [pos.left, pos.top, size.width + pos.left, size.height + pos.top];
1334
1335      // Account any parent Frames scroll offset
1336      if (node.ownerDocument !== document) {
1337        var win = node.ownerDocument.defaultView;
1338        to[0] += win.pageXOffset;
1339        to[1] += win.pageYOffset;
1340        to[2] += win.pageXOffset;
1341        to[3] += win.pageYOffset;
1342      }
1343
1344      BOUNDS_FORMAT.forEach(function (side, i) {
1345        side = side[0].toUpperCase() + side.substr(1);
1346        if (side === 'Top' || side === 'Left') {
1347          to[i] += parseFloat(style['border' + side + 'Width']);
1348        } else {
1349          to[i] -= parseFloat(style['border' + side + 'Width']);
1350        }
1351      });
1352    })();
1353  }
1354
1355  return to;
1356}
1357
1358TetherBase.modules.push({
1359  position: function position(_ref) {
1360    var _this = this;
1361
1362    var top = _ref.top;
1363    var left = _ref.left;
1364    var targetAttachment = _ref.targetAttachment;
1365
1366    if (!this.options.constraints) {
1367      return true;
1368    }
1369
1370    var _cache = this.cache('element-bounds', function () {
1371      return getBounds(_this.element);
1372    });
1373
1374    var height = _cache.height;
1375    var width = _cache.width;
1376
1377    if (width === 0 && height === 0 && typeof this.lastSize !== 'undefined') {
1378      var _lastSize = this.lastSize;
1379
1380      // Handle the item getting hidden as a result of our positioning without glitching
1381      // the classes in and out
1382      width = _lastSize.width;
1383      height = _lastSize.height;
1384    }
1385
1386    var targetSize = this.cache('target-bounds', function () {
1387      return _this.getTargetBounds();
1388    });
1389
1390    var targetHeight = targetSize.height;
1391    var targetWidth = targetSize.width;
1392
1393    var allClasses = [this.getClass('pinned'), this.getClass('out-of-bounds')];
1394

1395    this.options.constraints.forEach(function (constraint) {
1396      var outOfBoundsClass = constraint.outOfBoundsClass;
1397      var pinnedClass = constraint.pinnedClass;
1398
1399      if (outOfBoundsClass) {
1400        allClasses.push(outOfBoundsClass);
1401      }
1402      if (pinnedClass) {
1403        allClasses.push(pinnedClass);
1404      }
1405    });
1406
1407    allClasses.forEach(function (cls) {
1408      ['left', 'top', 'right', 'bottom'].forEach(function (side) {
1409        allClasses.push(cls + '-' + side);
1410      });
1411    });
1412
1413    var addClasses = [];
1414
1415    var tAttachment = extend({}, targetAttachment);
1416    var eAttachment = extend({}, this.attachment);
1417
1418    this.options.constraints.forEach(function (constraint) {
1419      var to = constraint.to;
1420      var attachment = constraint.attachment;
1421      var pin = constraint.pin;
1422
1423      if (typeof attachment === 'undefined') {
1424        attachment = '';
1425      }
1426
1427      var changeAttachX = undefined,
1428          changeAttachY = undefined;
1429      if (attachment.indexOf(' ') >= 0) {
1430        var _attachment$split = attachment.split(' ');
1431
1432        var _attachment$split2 = _slicedToArray(_attachment$split, 2);
1433
1434        changeAttachY = _attachment$split2[0];
1435        changeAttachX = _attachment$split2[1];
1436      } else {
1437        changeAttachX = changeAttachY = attachment;
1438      }
1439
1440      var bounds = getBoundingRect(_this, to);
1441
1442      if (changeAttachY === 'target' || changeAttachY === 'both') {
1443        if (top < bounds[1] && tAttachment.top === 'top') {
1444          top += targetHeight;
1445          tAttachment.top = 'bottom';
1446        }
1447
1448        if (top + height > bounds[3] && tAttachment.top === 'bottom') {
1449          top -= targetHeight;
1450          tAttachment.top = 'top';
1451        }
1452      }
1453
1454      if (changeAttachY === 'together') {
1455        if (tAttachment.top === 'top') {
1456          if (eAttachment.top === 'bottom' && top < bounds[1]) {
1457            top += targetHeight;
1458            tAttachment.top = 'bottom';
1459
1460            top += height;
1461            eAttachment.top = 'top';
1462          } else if (eAttachment.top === 'top' && top + height > bounds[3] && top - (height - targetHeight) >= bounds[1]) {
1463            top -= height - targetHeight;
1464            tAttachment.top = 'bottom';
1465
1466            eAttachment.top = 'bottom';
1467          }
1468        }
1469
1470        if (tAttachment.top === 'bottom') {
1471          if (eAttachment.top === 'top' && top + height > bounds[3]) {
1472            top -= targetHeight;
1473            tAttachment.top = 'top';
1474
1475            top -= height;
1476            eAttachment.top = 'bottom';
1477          } else if (eAttachment.top === 'bottom' && top < bounds[1] && top + (height * 2 - targetHeight) <= bounds[3]) {
1478            top += height - targetHeight;
1479            tAttachment.top = 'top';
1480
1481            eAttachment.top = 'top';
1482          }
1483        }
1484
1485        if (tAttachment.top === 'middle') {
1486          if (top + height > bounds[3] && eAttachment.top === 'top') {
1487            top -= height;
1488            eAttachment.top = 'bottom';
1489          } else if (top < bounds[1] && eAttachment.top === 'bottom') {
1490            top += height;
1491            eAttachment.top = 'top';
1492          }
1493        }
1494      }
1495
1496      if (changeAttachX === 'target' || changeAttachX === 'both') {
1497        if (left < bounds[0] && tAttachment.left === 'left') {
1498          left += targetWidth;
1499          tAttachment.left = 'right';
1500        }
1501
1502        if (left + width > bounds[2] && tAttachment.left === 'right') {
1503          left -= targetWidth;
1504          tAttachment.left = 'left';
1505        }
1506      }
1507
1508      if (changeAttachX === 'together') {
1509        if (left < bounds[0] && tAttachment.left === 'left') {
1510          if (eAttachment.left === 'right') {
1511            left += targetWidth;
1512            tAttachment.left = 'right';
1513
1514            left += width;
1515            eAttachment.left = 'left';
1516          } else if (eAttachment.left === 'left') {
1517            left += targetWidth;
1518            tAttachment.left = 'right';
1519
1520            left -= width;
1521            eAttachment.left = 'right';
1522          }
1523        } else if (left + width > bounds[2] && tAttachment.left === 'right') {
1524          if (eAttachment.left === 'left') {
1525            left -= targetWidth;
1526            tAttachment.left = 'left';
1527
1528            left -= width;
1529            eAttachment.left = 'right';
1530          } else if (eAttachment.left === 'right') {
1531            left -= targetWidth;
1532            tAttachment.left = 'left';
1533
1534            left += width;
1535            eAttachment.left = 'left';
1536          }
1537        } else if (tAttachment.left === 'center') {
1538          if (left + width > bounds[2] && eAttachment.left === 'left') {
1539            left -= width;
1540            eAttachment.left = 'right';
1541          } else if (left < bounds[0] && eAttachment.left === 'right') {
1542            left += width;
1543            eAttachment.left = 'left';
1544          }
1545        }
1546      }
1547
1548      if (changeAttachY === 'element' || changeAttachY === 'both') {
1549        if (top < bounds[1] && eAttachment.top === 'bottom') {
1550          top += height;
1551          eAttachment.top = 'top';
1552        }
1553
1554        if (top + height > bounds[3] && eAttachment.top === 'top') {
1555          top -= height;
1556          eAttachment.top = 'bottom';
1557        }
1558      }
1559
1560      if (changeAttachX === 'element' || changeAttachX === 'both') {
1561        if (left < bounds[0]) {
1562          if (eAttachment.left === 'right') {
1563            left += width;
1564            eAttachment.left = 'left';
1565          } else if (eAttachment.left === 'center') {
1566            left += width / 2;
1567            eAttachment.left = 'left';
1568          }
1569        }
1570
1571        if (left + width > bounds[2]) {
1572          if (eAttachment.left === 'left') {
1573            left -= width;
1574            eAttachment.left = 'right';
1575          } else if (eAttachment.left === 'center') {
1576            left -= width / 2;
1577            eAttachment.left = 'right';
1578          }
1579        }
1580      }
1581
1582      if (typeof pin === 'string') {
1583        pin = pin.split(',').map(function (p) {
1584          return p.trim();
1585        });
1586      } else if (pin === true) {
1587        pin = ['top', 'left', 'right', 'bottom'];
1588      }
1589
1590      pin = pin || [];
1591
1592      var pinned = [];
1593      var oob = [];
1594
1595      if (top < bounds[1]) {
1596        if (pin.indexOf('top') >= 0) {
1597          top = bounds[1];
1598          pinned.push('top');
1599        } else {
1600          oob.push('top');
1601        }
1602      }
1603
1604      if (top + height > bounds[3]) {
1605        if (pin.indexOf('bottom') >= 0) {
1606          top = bounds[3] - height;
1607          pinned.push('bottom');
1608        } else {
1609          oob.push('bottom');
1610        }
1611      }
1612
1613      if (left < bounds[0]) {
1614        if (pin.indexOf('left') >= 0) {
1615          left = bounds[0];
1616          pinned.push('left');
1617        } else {
1618          oob.push('left');
1619        }
1620      }
1621
1622      if (left + width > bounds[2]) {
1623        if (pin.indexOf('right') >= 0) {
1624          left = bounds[2] - width;
1625          pinned.push('right');
1626        } else {
1627          oob.push('right');
1628        }
1629      }
1630
1631      if (pinned.length) {
1632        (function () {
1633          var pinnedClass = undefined;
1634          if (typeof _this.options.pinnedClass !== 'undefined') {
1635            pinnedClass = _this.options.pinnedClass;
1636          } else {
1637            pinnedClass = _this.getClass('pinned');
1638          }
1639
1640          addClasses.push(pinnedClass);
1641          pinned.forEach(function (side) {
1642            addClasses.push(pinnedClass + '-' + side);
1643          });
1644        })();
1645      }
1646
1647      if (oob.length) {
1648        (function () {
1649          var oobClass = undefined;
1650          if (typeof _this.options.outOfBoundsClass !== 'undefined') {
1651            oobClass = _this.options.outOfBoundsClass;
1652          } else {
1653            oobClass = _this.getClass('out-of-bounds');
1654          }
1655
1656          addClasses.push(oobClass);
1657          oob.forEach(function (side) {
1658            addClasses.push(oobClass + '-' + side);
1659          });
1660        })();
1661      }
1662
1663      if (pinned.indexOf('left') >= 0 || pinned.indexOf('right') >= 0) {
1664        eAttachment.left = tAttachment.left = false;

1665      }
1666      if (pinned.indexOf('top') >= 0 || pinned.indexOf('bottom') >= 0) {
1667        eAttachment.top = tAttachment.top = false;
1668      }
1669
1670      if (tAttachment.top !== targetAttachment.top || tAttachment.left !== targetAttachment.left || eAttachment.top !== _this.attachment.top || eAttachment.left !== _this.attachment.left) {
1671        _this.updateAttachClasses(eAttachment, tAttachment);
1672        _this.trigger('update', {
1673          attachment: eAttachment,
1674          targetAttachment: tAttachment
1675        });
1676      }
1677    });
1678
1679    defer(function () {
1680      if (!(_this.options.addTargetClasses === false)) {
1681        updateClasses(_this.target, addClasses, allClasses);
1682      }
1683      updateClasses(_this.element, addClasses, allClasses);
1684    });
1685
1686    return { top: top, left: left };
1687  }
1688});
1689/* globals TetherBase */
1690
1691'use strict';
1692
1693var _TetherBase$Utils = TetherBase.Utils;
1694var getBounds = _TetherBase$Utils.getBounds;
1695var updateClasses = _TetherBase$Utils.updateClasses;
1696var defer = _TetherBase$Utils.defer;
1697
1698TetherBase.modules.push({
1699  position: function position(_ref) {
1700    var _this = this;
1701
1702    var top = _ref.top;
1703    var left = _ref.left;
1704
1705    var _cache = this.cache('element-bounds', function () {
1706      return getBounds(_this.element);
1707    });
1708
1709    var height = _cache.height;
1710    var width = _cache.width;
1711
1712    var targetPos = this.getTargetBounds();
1713
1714    var bottom = top + height;
1715    var right = left + width;
1716
1717    var abutted = [];
1718    if (top <= targetPos.bottom && bottom >= targetPos.top) {
1719      ['left', 'right'].forEach(function (side) {
1720        var targetPosSide = targetPos[side];
1721        if (targetPosSide === left || targetPosSide === right) {
1722          abutted.push(side);
1723        }
1724      });
1725    }
1726
1727    if (left <= targetPos.right && right >= targetPos.left) {
1728      ['top', 'bottom'].forEach(function (side) {
1729        var targetPosSide = targetPos[side];
1730        if (targetPosSide === top || targetPosSide === bottom) {
1731          abutted.push(side);
1732        }
1733      });
1734    }
1735
1736    var allClasses = [];
1737    var addClasses = [];
1738
1739    var sides = ['left', 'top', 'right', 'bottom'];
1740    allClasses.push(this.getClass('abutted'));
1741    sides.forEach(function (side) {
1742      allClasses.push(_this.getClass('abutted') + '-' + side);
1743    });
1744
1745    if (abutted.length) {
1746      addClasses.push(this.getClass('abutted'));
1747    }
1748
1749    abutted.forEach(function (side) {
1750      addClasses.push(_this.getClass('abutted') + '-' + side);
1751    });
1752
1753    defer(function () {
1754      if (!(_this.options.addTargetClasses === false)) {
1755        updateClasses(_this.target, addClasses, allClasses);
1756      }
1757      updateClasses(_this.element, addClasses, allClasses);
1758    });
1759
1760    return true;
1761  }
1762});
1763/* globals TetherBase */
1764
1765'use strict';
1766
1767var _slicedToArray = (function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i['return']) _i['return'](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError('Invalid attempt to destructure non-iterable instance'); } }; })();
1768
1769TetherBase.modules.push({
1770  position: function position(_ref) {
1771    var top = _ref.top;
1772    var left = _ref.left;
1773
1774    if (!this.options.shift) {
1775      return;
1776    }
1777
1778    var shift = this.options.shift;
1779    if (typeof this.options.shift === 'function') {
1780      shift = this.options.shift.call(this, { top: top, left: left });
1781    }
1782
1783    var shiftTop = undefined,
1784        shiftLeft = undefined;
1785    if (typeof shift === 'string') {
1786      shift = shift.split(' ');
1787      shift[1] = shift[1] || shift[0];
1788
1789      var _shift = shift;
1790
1791      var _shift2 = _slicedToArray(_shift, 2);
1792
1793      shiftTop = _shift2[0];
1794      shiftLeft = _shift2[1];
1795
1796      shiftTop = parseFloat(shiftTop, 10);
1797      shiftLeft = parseFloat(shiftLeft, 10);
1798    } else {
1799      shiftTop = shift.top;
1800      shiftLeft = shift.left;
1801    }
1802
1803    top += shiftTop;
1804    left += shiftLeft;
1805
1806    return { top: top, left: left };
1807  }
1808});
1809return Tether;
1810
1811}));