93 lines
3.1 KiB
JavaScript
93 lines
3.1 KiB
JavaScript
/**
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* @fileoverview dragscroll - scroll area by dragging
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* @version 0.0.8
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*
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* @license MIT, see http://github.com/asvd/dragscroll
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* @copyright 2015 asvd <heliosframework@gmail.com>
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*/
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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define(['exports'], factory);
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} else if (typeof exports !== 'undefined') {
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factory(exports);
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} else {
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factory((root.dragscroll = {}));
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}
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}(this, function (exports) {
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var _window = window;
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var _document = document;
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var mousemove = 'mousemove';
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var mouseup = 'mouseup';
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var mousedown = 'mousedown';
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var EventListener = 'EventListener';
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var addEventListener = 'add'+EventListener;
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var removeEventListener = 'remove'+EventListener;
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var newScrollX, newScrollY;
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var dragged = [];
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var reset = function(i, el) {
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for (i = 0; i < dragged.length;) {
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el = dragged[i++];
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el = el.container || el;
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el[removeEventListener](mousedown, el.md, 0);
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_window[removeEventListener](mouseup, el.mu, 0);
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_window[removeEventListener](mousemove, el.mm, 0);
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}
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// cloning into array since HTMLCollection is updated dynamically
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dragged = [].slice.call(_document.getElementsByClassName('dragscroll'));
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for (i = 0; i < dragged.length;) {
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(function(el, lastClientX, lastClientY, pushed, scroller, cont){
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(cont = el.container || el)[addEventListener](
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mousedown,
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cont.md = function(e) {
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if (!el.hasAttribute('nochilddrag') ||
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_document.elementFromPoint(
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e.pageX, e.pageY
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) == cont
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) {
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pushed = 1;
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lastClientX = e.clientX;
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lastClientY = e.clientY;
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e.preventDefault();
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}
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}, 0
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);
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_window[addEventListener](
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mouseup, cont.mu = function() {pushed = 0;}, 0
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);
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_window[addEventListener](
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mousemove,
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cont.mm = function(e) {
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if (pushed) {
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(scroller = el.scroller||el).scrollLeft -=
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newScrollX = (- lastClientX + (lastClientX=e.clientX));
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scroller.scrollTop -=
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newScrollY = (- lastClientY + (lastClientY=e.clientY));
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if (el == _document.body) {
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(scroller = _document.documentElement).scrollLeft -= newScrollX;
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scroller.scrollTop -= newScrollY;
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}
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}
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}, 0
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);
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})(dragged[i++]);
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}
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}
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if (_document.readyState == 'complete') {
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reset();
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} else {
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_window[addEventListener]('load', reset, 0);
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}
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exports.reset = reset;
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}));
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