src/wolnelektury/static/js/contrib/jquery.scrollto.js

   1 /*!
   2  * jQuery.scrollTo
   3  * Copyright (c) 2007 Ariel Flesler - aflesler ○ gmail • com | https://github.com/flesler
   4  * Licensed under MIT
   5  * https://github.com/flesler/jquery.scrollTo
   6  * @projectDescription Lightweight, cross-browser and highly customizable animated scrolling with jQuery
   7  * @author Ariel Flesler
   8  * @version 2.1.3
   9  */
  10 ;(function(factory) {
  11         'use strict';
  12         if (typeof define === 'function' && define.amd) {
  13                 // AMD
  14                 define(['jquery'], factory);
  15         } else if (typeof module !== 'undefined' && module.exports) {
  16                 // CommonJS
  17                 module.exports = factory(require('jquery'));
  18         } else {
  19                 // Global
  20                 factory(jQuery);
  21         }
  22 })(function($) {
  23         'use strict';
  24
  25         var $scrollTo = $.scrollTo = function(target, duration, settings) {
  26                 return $(window).scrollTo(target, duration, settings);
  27         };
  28
  29         $scrollTo.defaults = {
  30                 axis:'xy',
  31                 duration: 0,
  32                 limit:true
  33         };
  34
  35         function isWin(elem) {
  36                 return !elem.nodeName ||
  37                         $.inArray(elem.nodeName.toLowerCase(), ['iframe','#document','html','body']) !== -1;
  38         }
  39
  40         function isFunction(obj) {
  41                 // Brought from jQuery since it's deprecated
  42                 return typeof obj === 'function'
  43         }
  44
  45         $.fn.scrollTo = function(target, duration, settings) {
  46                 if (typeof duration === 'object') {
  47                         settings = duration;
  48                         duration = 0;
  49                 }
  50                 if (typeof settings === 'function') {
  51                         settings = { onAfter:settings };
  52                 }
  53                 if (target === 'max') {
  54                         target = 9e9;
  55                 }
  56
  57                 settings = $.extend({}, $scrollTo.defaults, settings);
  58                 // Speed is still recognized for backwards compatibility
  59                 duration = duration || settings.duration;
  60                 // Make sure the settings are given right
  61                 var queue = settings.queue && settings.axis.length > 1;
  62                 if (queue) {
  63                         // Let's keep the overall duration
  64                         duration /= 2;
  65                 }
  66                 settings.offset = both(settings.offset);
  67                 settings.over = both(settings.over);
  68
  69                 return this.each(function() {
  70                         // Null target yields nothing, just like jQuery does
  71                         if (target === null) return;
  72
  73                         var win = isWin(this),
  74                                 elem = win ? this.contentWindow || window : this,
  75                                 $elem = $(elem),
  76                                 targ = target,
  77                                 attr = {},
  78                                 toff;
  79
  80                         switch (typeof targ) {
  81                                 // A number will pass the regex
  82                                 case 'number':
  83                                 case 'string':
  84                                         if (/^([+-]=?)?\d+(\.\d+)?(px|%)?$/.test(targ)) {
  85                                                 targ = both(targ);
  86                                                 // We are done
  87                                                 break;
  88                                         }
  89                                         // Relative/Absolute selector
  90                                         targ = win ? $(targ) : $(targ, elem);
  91                                         /* falls through */
  92                                 case 'object':
  93                                         if (targ.length === 0) return;
  94                                         // DOMElement / jQuery
  95                                         if (targ.is || targ.style) {
  96                                                 // Get the real position of the target
  97                                                 toff = (targ = $(targ)).offset();
  98                                         }
  99                         }
 100
 101                         var offset = isFunction(settings.offset) && settings.offset(elem, targ) || settings.offset;
 102
 103                         $.each(settings.axis.split(''), function(i, axis) {
 104                                 var Pos = axis === 'x' ? 'Left' : 'Top',
 105                                         pos = Pos.toLowerCase(),
 106                                         key = 'scroll' + Pos,
 107                                         prev = $elem[key](),
 108                                         max = $scrollTo.max(elem, axis);
 109
 110                                 if (toff) {// jQuery / DOMElement
 111                                         attr[key] = toff[pos] + (win ? 0 : prev - $elem.offset()[pos]);
 112
 113                                         // If it's a dom element, reduce the margin
 114                                         if (settings.margin) {
 115                                                 attr[key] -= parseInt(targ.css('margin'+Pos), 10) || 0;
 116                                                 attr[key] -= parseInt(targ.css('border'+Pos+'Width'), 10) || 0;
 117                                         }
 118
 119                                         attr[key] += offset[pos] || 0;
 120
 121                                         if (settings.over[pos]) {
 122                                                 // Scroll to a fraction of its width/height
 123                                                 attr[key] += targ[axis === 'x'?'width':'height']() * settings.over[pos];
 124                                         }
 125                                 } else {
 126                                         var val = targ[pos];
 127                                         // Handle percentage values
 128                                         attr[key] = val.slice && val.slice(-1) === '%' ?
 129                                                 parseFloat(val) / 100 * max
 130                                                 : val;
 131                                 }
 132
 133                                 // Number or 'number'
 134                                 if (settings.limit && /^\d+$/.test(attr[key])) {
 135                                         // Check the limits
 136                                         attr[key] = attr[key] <= 0 ? 0 : Math.min(attr[key], max);
 137                                 }
 138
 139                                 // Don't waste time animating, if there's no need.
 140                                 if (!i && settings.axis.length > 1) {
 141                                         if (prev === attr[key]) {
 142                                                 // No animation needed
 143                                                 attr = {};
 144                                         } else if (queue) {
 145                                                 // Intermediate animation
 146                                                 animate(settings.onAfterFirst);
 147                                                 // Don't animate this axis again in the next iteration.
 148                                                 attr = {};
 149                                         }
 150                                 }
 151                         });
 152
 153                         animate(settings.onAfter);
 154
 155                         function animate(callback) {
 156                                 var opts = $.extend({}, settings, {
 157                                         // The queue setting conflicts with animate()
 158                                         // Force it to always be true
 159                                         queue: true,
 160                                         duration: duration,
 161                                         complete: callback && function() {
 162                                                 callback.call(elem, targ, settings);
 163                                         }
 164                                 });
 165                                 $elem.animate(attr, opts);
 166                         }
 167                 });
 168         };
 169
 170         // Max scrolling position, works on quirks mode
 171         // It only fails (not too badly) on IE, quirks mode.
 172         $scrollTo.max = function(elem, axis) {
 173                 var Dim = axis === 'x' ? 'Width' : 'Height',
 174                         scroll = 'scroll'+Dim;
 175
 176                 if (!isWin(elem))
 177                         return elem[scroll] - $(elem)[Dim.toLowerCase()]();
 178
 179                 var size = 'client' + Dim,
 180                         doc = elem.ownerDocument || elem.document,
 181                         html = doc.documentElement,
 182                         body = doc.body;
 183
 184                 return Math.max(html[scroll], body[scroll]) - Math.min(html[size], body[size]);
 185         };
 186
 187         function both(val) {
 188                 return isFunction(val) || $.isPlainObject(val) ? val : { top:val, left:val };
 189         }
 190
 191         // Add special hooks so that window scroll properties can be animated
 192         $.Tween.propHooks.scrollLeft =
 193         $.Tween.propHooks.scrollTop = {
 194                 get: function(t) {
 195                         return $(t.elem)[t.prop]();
 196                 },
 197                 set: function(t) {
 198                         var curr = this.get(t);
 199                         // If interrupt is true and user scrolled, stop animating
 200                         if (t.options.interrupt && t._last && t._last !== curr) {
 201                                 return $(t.elem).stop();
 202                         }
 203                         var next = Math.round(t.now);
 204                         // Don't waste CPU
 205                         // Browsers don't render floating point scroll
 206                         if (curr !== next) {
 207                                 $(t.elem)[t.prop](next);
 208                                 t._last = this.get(t);
 209                         }
 210                 }
 211         };
 212
 213         // AMD requirement
 214         return $scrollTo;
 215 });