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annotate src/main/webapp/resources/js/jquery.doubleScroll.js @ 35:89a5ca7d44f7

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new: rename branch to task, add fields in task table, add scroll bar
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Thu, 19 Nov 2015 17:14:06 +0100
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35
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1 /*
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2 * @name DoubleScroll
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3 * @desc displays scroll bar on top and on the bottom of the div
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4 * @requires jQuery
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5 *
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6 * @author Pawel Suwala - http://suwala.eu/
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7 * @author Antoine Vianey - http://www.astek.fr/
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8 * @version 0.4 (18-06-2014)
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9 *
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10 * Dual licensed under the MIT and GPL licenses:
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11 * http://www.opensource.org/licenses/mit-license.php
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12 * http://www.gnu.org/licenses/gpl.html
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13 *
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14 * Usage:
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15 * https://github.com/avianey/jqDoubleScroll
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16 */
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17
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18 jQuery.fn.doubleScroll = function(userOptions) {
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19 var $ = jQuery;
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20 // Default options
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21 var options = {
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22 contentElement: undefined, // Widest element, if not specified first child element will be used
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23 scrollCss: {
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24 'overflow-x': 'auto',
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25 'overflow-y': 'hidden'
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26 },
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27 contentCss: {
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28 'overflow-x': 'auto',
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29 'overflow-y': 'hidden'
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30 },
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31 onlyIfScroll: true, // top scrollbar is not shown if the bottom one is not present
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32 resetOnWindowResize: true, // recompute the top ScrollBar requirements when the window is resized
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33 timeToWaitForResize: 30 // wait for the last update event (usefull when browser fire resize event constantly during ressing)
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34 };
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35 $.extend(true, options, userOptions);
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36 // do not modify
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37 // internal stuff
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38 $.extend(options, {
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39 topScrollBarMarkup: '<div class="doubleScroll-scroll-wrapper" style="height: 20px;"><div class="doubleScroll-scroll" style="height: 20px;"></div></div>',
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40 topScrollBarWrapperSelector: '.doubleScroll-scroll-wrapper',
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41 topScrollBarInnerSelector: '.doubleScroll-scroll'
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42 });
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43
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44 var _showScrollBar = function($self, options) {
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45
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46 if (options.onlyIfScroll && $self.get(0).scrollWidth <= $self.width()) {
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47 // content doesn't scroll
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48 // remove any existing occurrence...
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49 $self.prev(options.topScrollBarWrapperSelector).remove();
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50 return;
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51 }
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52
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53 // add div that will act as an upper scroll only if not already added to the DOM
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54 var $topScrollBar = $self.prev(options.topScrollBarWrapperSelector);
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55 if ($topScrollBar.length == 0) {
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56
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57 // creating the scrollbar
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58 // added before in the DOM
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59 $topScrollBar = $(options.topScrollBarMarkup);
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60 $self.before($topScrollBar);
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61
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62 // apply the css
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63 $topScrollBar.css(options.scrollCss);
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64 $self.css(options.contentCss);
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65
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66 // bind upper scroll to bottom scroll
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67 $topScrollBar.bind('scroll.doubleScroll', function() {
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68 $self.scrollLeft($topScrollBar.scrollLeft());
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69 });
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70
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71 // bind bottom scroll to upper scroll
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72 var selfScrollHandler = function() {
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73 $topScrollBar.scrollLeft($self.scrollLeft());
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74 };
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75 $self.bind('scroll.doubleScroll', selfScrollHandler);
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76 }
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77
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78 // find the content element (should be the widest one)
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79 var $contentElement;
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80 if (options.contentElement !== undefined && $self.find(options.contentElement).length !== 0) {
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81 $contentElement = $self.find(options.contentElement);
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82 } else {
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83 $contentElement = $self.find('>:first-child');
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84 }
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85
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86 // set the width of the wrappers
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87 $(options.topScrollBarInnerSelector, $topScrollBar).width($contentElement.outerWidth());
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88 $topScrollBar.width($self.width());
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89 $topScrollBar.scrollLeft($self.scrollLeft());
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90
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91 }
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92
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93 return this.each(function() {
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94 var $self = $(this);
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95 _showScrollBar($self, options);
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96
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97 // bind the resize handler
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98 // do it once
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99 if (options.resetOnWindowResize) {
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100 var id;
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101 var handler = function(e) {
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102 _showScrollBar($self, options);
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103 };
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104 $(window).bind('resize.doubleScroll', function() {
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105 // adding/removing/replacing the scrollbar might resize the window
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106 // so the resizing flag will avoid the infinite loop here...
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107 clearTimeout(id);
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108 id = setTimeout(handler, options.timeToWaitForResize);
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109 });
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110 }
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111 });
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112 }