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strict';\n\nfunction _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }\n\nvar typeFunc = require('type-func');\nvar animationFramePolyfill = require('animation-frame-polyfill');\nvar domSet = require('dom-set');\nvar domPlane = require('dom-plane');\nvar mousemoveDispatcher = _interopDefault(require('dom-mousemove-dispatcher'));\n\nfunction AutoScroller(elements, options){\n    if ( options === void 0 ) options = {};\n\n    var self = this;\n    var maxSpeed = 4, scrolling = false;\n\n    this.margin = options.margin || -1;\n    //this.scrolling = false;\n    this.scrollWhenOutside = options.scrollWhenOutside || false;\n\n    var point = {},\n        pointCB = domPlane.createPointCB(point),\n        dispatcher = mousemoveDispatcher(),\n        down = false;\n\n    window.addEventListener('mousemove', pointCB, false);\n    window.addEventListener('touchmove', pointCB, false);\n\n    if(!isNaN(options.maxSpeed)){\n        maxSpeed = options.maxSpeed;\n    }\n\n    this.autoScroll = typeFunc.boolean(options.autoScroll);\n    this.syncMove = typeFunc.boolean(options.syncMove, false);\n\n    this.destroy = function(forceCleanAnimation) {\n        window.removeEventListener('mousemove', pointCB, false);\n        window.removeEventListener('touchmove', pointCB, false);\n        window.removeEventListener('mousedown', onDown, false);\n        window.removeEventListener('touchstart', onDown, false);\n        window.removeEventListener('mouseup', onUp, false);\n        window.removeEventListener('touchend', onUp, false);\n        window.removeEventListener('pointerup', onUp, false);\n        window.removeEventListener('mouseleave', onMouseOut, false);\n\n        window.removeEventListener('mousemove', onMove, false);\n        window.removeEventListener('touchmove', onMove, false);\n\n        window.removeEventListener('scroll', setScroll, true);\n        elements = [];\n        if(forceCleanAnimation){\n          cleanAnimation();\n        }\n    };\n\n    this.add = function(){\n        var element = [], len = arguments.length;\n        while ( len-- ) element[ len ] = arguments[ len ];\n\n        domSet.addElements.apply(void 0, [ elements ].concat( element ));\n        return this;\n    };\n\n    this.remove = function(){\n        var element = [], len = arguments.length;\n        while ( len-- ) element[ len ] = arguments[ len ];\n\n        return domSet.removeElements.apply(void 0, [ elements ].concat( element ));\n    };\n\n    var hasWindow = null, windowAnimationFrame;\n\n    if(Object.prototype.toString.call(elements) !== '[object Array]'){\n        elements = [elements];\n    }\n\n    (function(temp){\n        elements = [];\n        temp.forEach(function(element){\n            if(element === window){\n                hasWindow = window;\n            }else{\n                self.add(element);\n            }\n        });\n    }(elements));\n\n    Object.defineProperties(this, {\n        down: {\n            get: function(){ return down; }\n        },\n        maxSpeed: {\n            get: function(){ return maxSpeed; }\n        },\n        point: {\n            get: function(){ return point; }\n        },\n        scrolling: {\n            get: function(){ return scrolling; }\n        }\n    });\n\n    var n = 0, current = null, animationFrame;\n\n    window.addEventListener('mousedown', onDown, false);\n    window.addEventListener('touchstart', onDown, false);\n    window.addEventListener('mouseup', onUp, false);\n    window.addEventListener('touchend', onUp, false);\n\n    /*\n    IE does not trigger mouseup event when scrolling.\n    It is a known issue that Microsoft won't fix.\n    https://connect.microsoft.com/IE/feedback/details/783058/scrollbar-trigger-mousedown-but-not-mouseup\n    IE supports pointer events instead\n    */\n    window.addEventListener('pointerup', onUp, false);\n\n    window.addEventListener('mousemove', onMove, false);\n    window.addEventListener('touchmove', onMove, false);\n\n    window.addEventListener('mouseleave', onMouseOut, false);\n\n    window.addEventListener('scroll', setScroll, true);\n\n    function setScroll(e){\n\n        for(var i=0; i<elements.length; i++){\n            if(elements[i] === e.target){\n                scrolling = true;\n                break;\n            }\n        }\n\n        if(scrolling){\n            animationFramePolyfill.requestAnimationFrame(function (){ return scrolling = false; });\n        }\n    }\n\n    function onDown(){\n        down = true;\n    }\n\n    function onUp(){\n        down = false;\n        cleanAnimation();\n    }\n    function cleanAnimation(){\n      animationFramePolyfill.cancelAnimationFrame(animationFrame);\n      animationFramePolyfill.cancelAnimationFrame(windowAnimationFrame);\n    }\n    function onMouseOut(){\n        down = false;\n    }\n\n    function getTarget(target){\n        if(!target){\n            return null;\n        }\n\n        if(current === target){\n            return target;\n        }\n\n        if(domSet.hasElement(elements, target)){\n            return target;\n        }\n\n        while(target = target.parentNode){\n            if(domSet.hasElement(elements, target)){\n                return target;\n            }\n        }\n\n        return null;\n    }\n\n    function getElementUnderPoint(){\n        var underPoint = null;\n\n        for(var i=0; i<elements.length; i++){\n            if(inside(point, elements[i])){\n                underPoint = elements[i];\n            }\n        }\n\n        return underPoint;\n    }\n\n\n    function onMove(event){\n\n        if(!self.autoScroll()) { return; }\n\n        if(event['dispatched']){ return; }\n\n        var target = event.target, body = document.body;\n\n        if(current && !inside(point, current)){\n            if(!self.scrollWhenOutside){\n                current = null;\n            }\n        }\n\n        if(target && target.parentNode === body){\n            //The special condition to improve speed.\n            target = getElementUnderPoint();\n        }else{\n            target = getTarget(target);\n\n            if(!target){\n                target = getElementUnderPoint();\n            }\n        }\n\n\n        if(target && target !== current){\n            current = target;\n        }\n\n        if(hasWindow){\n            animationFramePolyfill.cancelAnimationFrame(windowAnimationFrame);\n            windowAnimationFrame = animationFramePolyfill.requestAnimationFrame(scrollWindow);\n        }\n\n\n        if(!current){\n            return;\n        }\n\n        animationFramePolyfill.cancelAnimationFrame(animationFrame);\n        animationFrame = animationFramePolyfill.requestAnimationFrame(scrollTick);\n    }\n\n    function scrollWindow(){\n        autoScroll(hasWindow);\n\n        animationFramePolyfill.cancelAnimationFrame(windowAnimationFrame);\n        windowAnimationFrame = animationFramePolyfill.requestAnimationFrame(scrollWindow);\n    }\n\n    function scrollTick(){\n\n        if(!current){\n            return;\n        }\n\n        autoScroll(current);\n\n        animationFramePolyfill.cancelAnimationFrame(animationFrame);\n        animationFrame = animationFramePolyfill.requestAnimationFrame(scrollTick);\n\n    }\n\n\n    function autoScroll(el){\n        var rect = domPlane.getClientRect(el), scrollx, scrolly;\n\n        if(point.x < rect.left + self.margin){\n            scrollx = Math.floor(\n                Math.max(-1, (point.x - rect.left) / self.margin - 1) * self.maxSpeed\n            );\n        }else if(point.x > rect.right - self.margin){\n            scrollx = Math.ceil(\n                Math.min(1, (point.x - rect.right) / self.margin + 1) * self.maxSpeed\n            );\n        }else{\n            scrollx = 0;\n        }\n\n        if(point.y < rect.top + self.margin){\n            scrolly = Math.floor(\n                Math.max(-1, (point.y - rect.top) / self.margin - 1) * self.maxSpeed\n            );\n        }else if(point.y > rect.bottom - self.margin){\n            scrolly = Math.ceil(\n                Math.min(1, (point.y - rect.bottom) / self.margin + 1) * self.maxSpeed\n            );\n        }else{\n            scrolly = 0;\n        }\n\n        if(self.syncMove()){\n            /*\n            Notes about mousemove event dispatch.\n            screen(X/Y) should need to be updated.\n            Some other properties might need to be set.\n            Keep the syncMove option default false until all inconsistencies are taken care of.\n            */\n            dispatcher.dispatch(el, {\n                pageX: point.pageX + scrollx,\n                pageY: point.pageY + scrolly,\n                clientX: point.x + scrollx,\n                clientY: point.y + scrolly\n            });\n        }\n\n        setTimeout(function (){\n\n            if(scrolly){\n                scrollY(el, scrolly);\n            }\n\n            if(scrollx){\n                scrollX(el, scrollx);\n            }\n\n        });\n    }\n\n    function scrollY(el, amount){\n        if(el === window){\n            window.scrollTo(el.pageXOffset, el.pageYOffset + amount);\n        }else{\n            el.scrollTop += amount;\n        }\n    }\n\n    function scrollX(el, amount){\n        if(el === window){\n            window.scrollTo(el.pageXOffset + amount, el.pageYOffset);\n        }else{\n            el.scrollLeft += amount;\n        }\n    }\n\n}\n\nfunction AutoScrollerFactory(element, options){\n    return new AutoScroller(element, options);\n}\n\nfunction inside(point, el, rect){\n    if(!rect){\n        return domPlane.pointInside(point, el);\n    }else{\n        return (point.y > rect.top && point.y < rect.bottom &&\n                point.x > rect.left && point.x < rect.right);\n    }\n}\n\n/*\ngit remote add origin https://github.com/hollowdoor/dom_autoscroller.git\ngit push -u origin 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