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Editing: dragscroll.js

/**
 * @fileoverview dragscroll - scroll area by dragging
 * @version 0.0.8
 * 
 * @license MIT, see http://github.com/asvd/dragscroll
 * @copyright 2015 asvd <heliosframework@gmail.com> 
 */

var dragged = [];
    var reset = function(i, el) {
        for (i = 0; i < dragged.length;) {
            el = dragged[i++];
            el = el.container || el;
            el[removeEventListener](mousedown, el.md, 0);
            _window[removeEventListener](mouseup, el.mu, 0);
            _window[removeEventListener](mousemove, el.mm, 0);
        }

// cloning into array since HTMLCollection is updated dynamically
        dragged = [].slice.call(_document.getElementsByClassName('dragscroll'));
        for (i = 0; i < dragged.length;) {
            (function(el, lastClientX, lastClientY, pushed, scroller, cont){
                (cont = el.container || el)[addEventListener](
                    mousedown,
                    cont.md = function(e) {
                        if (!el.hasAttribute('nochilddrag') ||
                            _document.elementFromPoint(
                                e.pageX, e.pageY
                            ) == cont
                        ) {
                            pushed = 1;
                            lastClientX = e.clientX;
                            lastClientY = e.clientY;

e.preventDefault();
                        }
                    }, 0
                );

_window[addEventListener](
                    mouseup, cont.mu = function() {pushed = 0;}, 0
                );

_window[addEventListener](
                    mousemove,
                    cont.mm = function(e) {
                        if (pushed) {
                            (scroller = el.scroller||el).scrollLeft -=
                                newScrollX = (- lastClientX + (lastClientX=e.clientX));
                            scroller.scrollTop -=
                                newScrollY = (- lastClientY + (lastClientY=e.clientY));
                            if (el == _document.body) {
                                (scroller = _document.documentElement).scrollLeft -= newScrollX;
                                scroller.scrollTop -= newScrollY;
                            }
                        }
                    }, 0
                );
             })(dragged[i++]);
        }
    }

if (_document.readyState == 'complete') {
        reset();
    } else {
        _window[addEventListener]('load', reset, 0);
    }

exports.reset = reset;
}));

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