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In IE6/7 quirks mode and\n  // IE6 standards mode, this border can be overridden by setting the\n  // document element's border to zero -- thus, we cannot rely on the\n  // offset always being 2 pixels.\n\n  // In quirks mode, the offset can be determined by querying the body's\n  // clientLeft/clientTop, but in standards mode, it is found by querying\n  // the document element's clientLeft/clientTop.  Since we already called\n  // getClientBoundingRect we have already forced a reflow, so it is not\n  // too expensive just to query them all.\n\n  // ie 下应该减去窗口的边框吧，毕竟默认 absolute 都是相对窗口定位的\n  // 窗口边框标准是设 documentElement ,quirks 时设置 body\n  // 最好禁止在 body 和 html 上边框 ，但 ie < 9 html 默认有 2px ，减去\n  // 但是非 ie 不可能设置窗口边框，body html 也不是窗口 ,ie 可以通过 html,body 设置\n  // 标准 ie 下 docElem.clientTop 就是 border-top\n  // ie7 html 即窗口边框改变不了。永远为 2\n  // 但标准 firefox/chrome/ie9 下 docElem.clientTop 是窗口边框，即使设了 border-top 也为 0\n\n  x -= docElem.clientLeft || body.clientLeft || 0;\n  y -= docElem.clientTop || body.clientTop || 0;\n  return {\n    left: x,\n    top: y\n  };\n}\nfunction getScroll(w, top) {\n  var ret = w[\"page\".concat(top ? 'Y' : 'X', \"Offset\")];\n  var method = \"scroll\".concat(top ? 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CUSTOM_STYLE.height,CUSTOM_STYLE.width ,cssHook 解决@2011-08-19\n  // 在 ie 下不对，需要直接用 offset 方式\n  // borderWidth 等值也有问题，但考虑到 borderWidth 设为百分比的概率很小，这里就不考虑了\n\n  // From the awesome hack by Dean Edwards\n  // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291\n  // If we're not dealing with a regular pixel number\n  // but a number that has a weird ending, we need to convert it to pixels\n  // exclude left right for relativity\n  if (_RE_NUM_NO_PX.test(ret) && !RE_POS.test(name)) {\n    // Remember the original values\n    var style = elem.style;\n    var left = style[LEFT];\n    var rsLeft = elem[RUNTIME_STYLE][LEFT];\n\n    // prevent flashing of content\n    elem[RUNTIME_STYLE][LEFT] = elem[CURRENT_STYLE][LEFT];\n\n    // Put in the new values to get a computed value out\n    style[LEFT] = name === 'fontSize' ? '1em' : ret || 0;\n    ret = style.pixelLeft + PX;\n\n    // Revert the changed values\n    style[LEFT] = left;\n    elem[RUNTIME_STYLE][LEFT] = rsLeft;\n  }\n  return ret === '' ? 'auto' : ret;\n}\nif (typeof window !== 'undefined') {\n  getComputedStyleX = window.getComputedStyle ? _getComputedStyle : _getComputedStyleIE;\n}\nfunction getOffsetDirection(dir, option) {\n  if (dir === 'left') {\n    return option.useCssRight ? 'right' : dir;\n  }\n  return option.useCssBottom ? 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domUtils.viewportWidth(elem) : domUtils.viewportHeight(elem);\n  } else if (elem.nodeType === 9) {\n    return name === 'width' ? domUtils.docWidth(elem) : domUtils.docHeight(elem);\n  }\n  var which = name === 'width' ? ['Left', 'Right'] : ['Top', 'Bottom'];\n  var borderBoxValue = name === 'width' ? Math.floor(elem.getBoundingClientRect().width) : Math.floor(elem.getBoundingClientRect().height);\n  var isBorderBox = isBorderBoxFn(elem);\n  var cssBoxValue = 0;\n  if (borderBoxValue === null || borderBoxValue === undefined || borderBoxValue <= 0) {\n    borderBoxValue = undefined;\n    // Fall back to computed then un computed css if necessary\n    cssBoxValue = getComputedStyleX(elem, name);\n    if (cssBoxValue === null || cssBoxValue === undefined || Number(cssBoxValue) < 0) {\n      cssBoxValue = elem.style[name] || 0;\n    }\n    // Normalize '', auto, and prepare for extra\n    cssBoxValue = Math.floor(parseFloat(cssBoxValue)) || 0;\n  }\n  if (extra === undefined) {\n    extra = isBorderBox ? BORDER_INDEX : CONTENT_INDEX;\n  }\n  var borderBoxValueOrIsBorderBox = borderBoxValue !== undefined || isBorderBox;\n  var val = borderBoxValue || cssBoxValue;\n  if (extra === CONTENT_INDEX) {\n    if (borderBoxValueOrIsBorderBox) {\n      return val - getPBMWidth(elem, ['border', 'padding'], which);\n    }\n    return cssBoxValue;\n  } else if (borderBoxValueOrIsBorderBox) {\n    if (extra === BORDER_INDEX) {\n      return val;\n    }\n    return val + (extra === PADDING_INDEX ? -getPBMWidth(elem, ['border'], which) : getPBMWidth(elem, ['margin'], which));\n  }\n  return cssBoxValue + getPBMWidth(elem, BOX_MODELS.slice(extra), which);\n}\nvar cssShow = {\n  position: 'absolute',\n  visibility: 'hidden',\n  display: 'block'\n};\n\n// fix #119 : https://github.com/kissyteam/kissy/issues/119\nfunction getWHIgnoreDisplay() {\n  for (var _len = arguments.length, args = new Array(_len), _key2 = 0; _key2 < _len; _key2++) {\n    args[_key2] = arguments[_key2];\n  }\n  var val;\n  var elem = args[0];\n  // in case elem is window\n  // elem.offsetWidth === undefined\n  if (elem.offsetWidth !== 0) {\n    val = getWH.apply(undefined, args);\n  } else {\n    swap(elem, cssShow, function () {\n      val = getWH.apply(undefined, args);\n    });\n  }\n  return val;\n}\neach(['width', 'height'], function (name) {\n  var first = name.charAt(0).toUpperCase() + name.slice(1);\n  domUtils[\"outer\".concat(first)] = function (el, includeMargin) {\n    return el && getWHIgnoreDisplay(el, name, includeMargin ? MARGIN_INDEX : BORDER_INDEX);\n  };\n  var which = name === 'width' ? ['Left', 'Right'] : ['Top', 'Bottom'];\n  domUtils[name] = function (elem, v) {\n    var val = v;\n    if (val !== undefined) {\n      if (elem) {\n        var isBorderBox = isBorderBoxFn(elem);\n        if (isBorderBox) {\n          val += getPBMWidth(elem, ['padding', 'border'], which);\n        }\n        return css(elem, name, val);\n      }\n      return undefined;\n    }\n    return elem && getWHIgnoreDisplay(elem, name, CONTENT_INDEX);\n  };\n});\nfunction mix(to, from) {\n  for (var i in from) {\n    if (from.hasOwnProperty(i)) {\n      to[i] = from[i];\n    }\n  }\n  return to;\n}\nvar utils = {\n  getWindow: function getWindow(node) {\n    if (node && node.document && node.setTimeout) {\n      return node;\n    }\n    var doc = node.ownerDocument || node;\n    return doc.defaultView || doc.parentWindow;\n  },\n  getDocument: getDocument,\n  offset: function offset(el, value, option) {\n    if (typeof value !== 'undefined') {\n      setOffset(el, value, option || {});\n    } else {\n      return getOffset(el);\n    }\n  },\n  isWindow: isWindow,\n  each: each,\n  css: css,\n  clone: function clone(obj) {\n    var i;\n    var ret = {};\n    for (i in obj) {\n      if (obj.hasOwnProperty(i)) {\n        ret[i] = obj[i];\n      }\n    }\n    var overflow = obj.overflow;\n    if (overflow) {\n      for (i in obj) {\n        if (obj.hasOwnProperty(i)) {\n          ret.overflow[i] = obj.overflow[i];\n        }\n      }\n    }\n    return ret;\n  },\n  mix: mix,\n  getWindowScrollLeft: function getWindowScrollLeft(w) {\n    return getScrollLeft(w);\n  },\n  getWindowScrollTop: function getWindowScrollTop(w) {\n    return getScrollTop(w);\n  },\n  merge: function merge() {\n    var ret = {};\n    for (var i = 0; i < arguments.length; i++) {\n      utils.mix(ret, i < 0 || arguments.length <= i ? undefined : arguments[i]);\n    }\n    return ret;\n  },\n  viewportWidth: 0,\n  viewportHeight: 0\n};\nmix(utils, domUtils);\n\n/**\n * 得到会导致元素显示不全的祖先元素\n */\nvar getParent = utils.getParent;\nfunction getOffsetParent(element) {\n  if (utils.isWindow(element) || element.nodeType === 9) {\n    return null;\n  }\n  // ie 这个也不是完全可行\n  /*\n   <div style=\"width: 50px;height: 100px;overflow: hidden\">\n   <div style=\"width: 50px;height: 100px;position: relative;\" id=\"d6\">\n   元素 6 高 100px 宽 50px<br/>\n   </div>\n   </div>\n   */\n  // element.offsetParent does the right thing in ie7 and below. Return parent with layout!\n  //  In other browsers it only includes elements with position absolute, relative or\n  // fixed, not elements with overflow set to auto or scroll.\n  //        if (UA.ie && ieMode < 8) {\n  //            return element.offsetParent;\n  //        }\n  // 统一的 offsetParent 方法\n  var doc = utils.getDocument(element);\n  var body = doc.body;\n  var parent;\n  var positionStyle = utils.css(element, 'position');\n  var skipStatic = positionStyle === 'fixed' || positionStyle === 'absolute';\n  if (!skipStatic) {\n    return element.nodeName.toLowerCase() === 'html' ? null : getParent(element);\n  }\n  for (parent = getParent(element); parent && parent !== body && parent.nodeType !== 9; parent = getParent(parent)) {\n    positionStyle = utils.css(parent, 'position');\n    if (positionStyle !== 'static') {\n      return parent;\n    }\n  }\n  return null;\n}\n\nvar getParent$1 = utils.getParent;\nfunction isAncestorFixed(element) {\n  if (utils.isWindow(element) || element.nodeType === 9) {\n    return false;\n  }\n  var doc = utils.getDocument(element);\n  var body = doc.body;\n  var parent = null;\n  for (parent = getParent$1(element);\n  // 修复元素位于 document.documentElement 下导致崩溃问题\n  parent && parent !== body && parent !== doc; parent = getParent$1(parent)) {\n    var positionStyle = utils.css(parent, 'position');\n    if (positionStyle === 'fixed') {\n      return true;\n    }\n  }\n  return false;\n}\n\n/**\n * 获得元素的显示部分的区域\n */\nfunction getVisibleRectForElement(element, alwaysByViewport) {\n  var visibleRect = {\n    left: 0,\n    right: Infinity,\n    top: 0,\n    bottom: Infinity\n  };\n  var el = getOffsetParent(element);\n  var doc = utils.getDocument(element);\n  var win = doc.defaultView || doc.parentWindow;\n  var body = doc.body;\n  var documentElement = doc.documentElement;\n\n  // Determine the size of the visible rect by climbing the dom accounting for\n  // all scrollable containers.\n  while (el) {\n    // clientWidth is zero for inline block elements in ie.\n    if ((navigator.userAgent.indexOf('MSIE') === -1 || el.clientWidth !== 0) &&\n    // body may have overflow set on it, yet we still get the entire\n    // viewport. In some browsers, el.offsetParent may be\n    // document.documentElement, so check for that too.\n    el !== body && el !== documentElement && utils.css(el, 'overflow') !== 'visible') {\n      var pos = utils.offset(el);\n      // add border\n      pos.left += el.clientLeft;\n      pos.top += el.clientTop;\n      visibleRect.top = Math.max(visibleRect.top, pos.top);\n      visibleRect.right = Math.min(visibleRect.right,\n      // consider area without scrollBar\n      pos.left + el.clientWidth);\n      visibleRect.bottom = Math.min(visibleRect.bottom, pos.top + el.clientHeight);\n      visibleRect.left = Math.max(visibleRect.left, pos.left);\n    } else if (el === body || el === documentElement) {\n      break;\n    }\n    el = getOffsetParent(el);\n  }\n\n  // Set element position to fixed\n  // make sure absolute element itself don't affect it's visible area\n  // https://github.com/ant-design/ant-design/issues/7601\n  var originalPosition = null;\n  if (!utils.isWindow(element) && element.nodeType !== 9) {\n    originalPosition = element.style.position;\n    var position = utils.css(element, 'position');\n    if (position === 'absolute') {\n      element.style.position = 'fixed';\n    }\n  }\n  var scrollX = utils.getWindowScrollLeft(win);\n  var scrollY = utils.getWindowScrollTop(win);\n  var viewportWidth = utils.viewportWidth(win);\n  var viewportHeight = utils.viewportHeight(win);\n  var documentWidth = documentElement.scrollWidth;\n  var documentHeight = documentElement.scrollHeight;\n\n  // scrollXXX on html is sync with body which means overflow: hidden on body gets wrong scrollXXX.\n  // We should cut this ourself.\n  var bodyStyle = window.getComputedStyle(body);\n  if (bodyStyle.overflowX === 'hidden') {\n    documentWidth = win.innerWidth;\n  }\n  if (bodyStyle.overflowY === 'hidden') {\n    documentHeight = win.innerHeight;\n  }\n\n  // Reset element position after calculate the visible area\n  if (element.style) {\n    element.style.position = originalPosition;\n  }\n  if (alwaysByViewport || isAncestorFixed(element)) {\n    // Clip by viewport's size.\n    visibleRect.left = Math.max(visibleRect.left, scrollX);\n    visibleRect.top = Math.max(visibleRect.top, scrollY);\n    visibleRect.right = Math.min(visibleRect.right, scrollX + viewportWidth);\n    visibleRect.bottom = Math.min(visibleRect.bottom, scrollY + viewportHeight);\n  } else {\n    // Clip by document's size.\n    var maxVisibleWidth = Math.max(documentWidth, scrollX + viewportWidth);\n    visibleRect.right = Math.min(visibleRect.right, maxVisibleWidth);\n    var maxVisibleHeight = Math.max(documentHeight, scrollY + viewportHeight);\n    visibleRect.bottom = Math.min(visibleRect.bottom, maxVisibleHeight);\n  }\n  return visibleRect.top >= 0 && visibleRect.left >= 0 && visibleRect.bottom > visibleRect.top && visibleRect.right > visibleRect.left ? visibleRect : null;\n}\n\nfunction adjustForViewport(elFuturePos, elRegion, visibleRect, overflow) {\n  var pos = utils.clone(elFuturePos);\n  var size = {\n    width: elRegion.width,\n    height: elRegion.height\n  };\n  if (overflow.adjustX && pos.left < visibleRect.left) {\n    pos.left = visibleRect.left;\n  }\n\n  // Left edge inside and right edge outside viewport, try to resize it.\n  if (overflow.resizeWidth && pos.left >= visibleRect.left && pos.left + size.width > visibleRect.right) {\n    size.width -= pos.left + size.width - visibleRect.right;\n  }\n\n  // Right edge outside viewport, try to move it.\n  if (overflow.adjustX && pos.left + size.width > visibleRect.right) {\n    // 保证左边界和可视区域左边界对齐\n    pos.left = Math.max(visibleRect.right - size.width, visibleRect.left);\n  }\n\n  // Top edge outside viewport, try to move it.\n  if (overflow.adjustY && pos.top < visibleRect.top) {\n    pos.top = visibleRect.top;\n  }\n\n  // Top edge inside and bottom edge outside viewport, try to resize it.\n  if (overflow.resizeHeight && pos.top >= visibleRect.top && pos.top + size.height > visibleRect.bottom) {\n    size.height -= pos.top + size.height - visibleRect.bottom;\n  }\n\n  // Bottom edge outside viewport, try to move it.\n  if (overflow.adjustY && pos.top + size.height > visibleRect.bottom) {\n    // 保证上边界和可视区域上边界对齐\n    pos.top = Math.max(visibleRect.bottom - size.height, visibleRect.top);\n  }\n  return utils.mix(pos, size);\n}\n\nfunction getRegion(node) {\n  var offset;\n  var w;\n  var h;\n  if (!utils.isWindow(node) && node.nodeType !== 9) {\n    offset = utils.offset(node);\n    w = utils.outerWidth(node);\n    h = utils.outerHeight(node);\n  } else {\n    var win = utils.getWindow(node);\n    offset = {\n      left: utils.getWindowScrollLeft(win),\n      top: utils.getWindowScrollTop(win)\n    };\n    w = utils.viewportWidth(win);\n    h = utils.viewportHeight(win);\n  }\n  offset.width = w;\n  offset.height = h;\n  return offset;\n}\n\n/**\n * 获取 node 上的 align 对齐点 相对于页面的坐标\n */\n\nfunction getAlignOffset(region, align) {\n  var V = align.charAt(0);\n  var H = align.charAt(1);\n  var w = region.width;\n  var h = region.height;\n  var x = region.left;\n  var y = region.top;\n  if (V === 'c') {\n    y += h / 2;\n  } else if (V === 'b') {\n    y += h;\n  }\n  if (H === 'c') {\n    x += w / 2;\n  } else if (H === 'r') {\n    x += w;\n  }\n  return {\n    left: x,\n    top: y\n  };\n}\n\nfunction getElFuturePos(elRegion, refNodeRegion, points, offset, targetOffset) {\n  var p1 = getAlignOffset(refNodeRegion, points[1]);\n  var p2 = getAlignOffset(elRegion, points[0]);\n  var diff = [p2.left - p1.left, p2.top - p1.top];\n  return {\n    left: Math.round(elRegion.left - diff[0] + offset[0] - targetOffset[0]),\n    top: Math.round(elRegion.top - diff[1] + offset[1] - targetOffset[1])\n  };\n}\n\n/**\n * align dom node flexibly\n * @author yiminghe@gmail.com\n */\n\n// http://yiminghe.iteye.com/blog/1124720\n\nfunction isFailX(elFuturePos, elRegion, visibleRect) {\n  return elFuturePos.left < visibleRect.left || elFuturePos.left + elRegion.width > visibleRect.right;\n}\nfunction isFailY(elFuturePos, elRegion, visibleRect) {\n  return elFuturePos.top < visibleRect.top || elFuturePos.top + elRegion.height > visibleRect.bottom;\n}\nfunction isCompleteFailX(elFuturePos, elRegion, visibleRect) {\n  return elFuturePos.left > visibleRect.right || elFuturePos.left + elRegion.width < visibleRect.left;\n}\nfunction isCompleteFailY(elFuturePos, elRegion, visibleRect) {\n  return elFuturePos.top > visibleRect.bottom || elFuturePos.top + elRegion.height < visibleRect.top;\n}\nfunction flip(points, reg, map) {\n  var ret = [];\n  utils.each(points, function (p) {\n    ret.push(p.replace(reg, function (m) {\n      return map[m];\n    }));\n  });\n  return ret;\n}\nfunction flipOffset(offset, index) {\n  offset[index] = -offset[index];\n  return offset;\n}\nfunction convertOffset(str, offsetLen) {\n  var n;\n  if (/%$/.test(str)) {\n    n = parseInt(str.substring(0, str.length - 1), 10) / 100 * offsetLen;\n  } else {\n    n = parseInt(str, 10);\n  }\n  return n || 0;\n}\nfunction normalizeOffset(offset, el) {\n  offset[0] = convertOffset(offset[0], el.width);\n  offset[1] = convertOffset(offset[1], el.height);\n}\n\n/**\n * @param el\n * @param tgtRegion 参照节点所占的区域: { left, top, width, height }\n * @param align\n */\nfunction doAlign(el, tgtRegion, align, isTgtRegionVisible) {\n  var points = align.points;\n  var offset = align.offset || [0, 0];\n  var targetOffset = align.targetOffset || [0, 0];\n  var overflow = align.overflow;\n  var source = align.source || el;\n  offset = [].concat(offset);\n  targetOffset = [].concat(targetOffset);\n  overflow = overflow || {};\n  var newOverflowCfg = {};\n  var fail = 0;\n  var alwaysByViewport = !!(overflow && overflow.alwaysByViewport);\n  // 当前节点可以被放置的显示区域\n  var visibleRect = getVisibleRectForElement(source, alwaysByViewport);\n  // 当前节点所占的区域, left/top/width/height\n  var elRegion = getRegion(source);\n  // 将 offset 转换成数值，支持百分比\n  normalizeOffset(offset, elRegion);\n  normalizeOffset(targetOffset, tgtRegion);\n  // 当前节点将要被放置的位置\n  var elFuturePos = getElFuturePos(elRegion, tgtRegion, points, offset, targetOffset);\n  // 当前节点将要所处的区域\n  var newElRegion = utils.merge(elRegion, elFuturePos);\n\n  // 如果可视区域不能完全放置当前节点时允许调整\n  if (visibleRect && (overflow.adjustX || overflow.adjustY) && isTgtRegionVisible) {\n    if (overflow.adjustX) {\n      // 如果横向不能放下\n      if (isFailX(elFuturePos, elRegion, visibleRect)) {\n        // 对齐位置反下\n        var newPoints = flip(points, /[lr]/gi, {\n          l: 'r',\n          r: 'l'\n        });\n        // 偏移量也反下\n        var newOffset = flipOffset(offset, 0);\n        var newTargetOffset = flipOffset(targetOffset, 0);\n        var newElFuturePos = getElFuturePos(elRegion, tgtRegion, newPoints, newOffset, newTargetOffset);\n        if (!isCompleteFailX(newElFuturePos, elRegion, visibleRect)) {\n          fail = 1;\n          points = newPoints;\n          offset = newOffset;\n          targetOffset = newTargetOffset;\n        }\n      }\n    }\n    if (overflow.adjustY) {\n      // 如果纵向不能放下\n      if (isFailY(elFuturePos, elRegion, visibleRect)) {\n        // 对齐位置反下\n        var _newPoints = flip(points, /[tb]/gi, {\n          t: 'b',\n          b: 't'\n        });\n        // 偏移量也反下\n        var _newOffset = flipOffset(offset, 1);\n        var _newTargetOffset = flipOffset(targetOffset, 1);\n        var _newElFuturePos = getElFuturePos(elRegion, tgtRegion, _newPoints, _newOffset, _newTargetOffset);\n        if (!isCompleteFailY(_newElFuturePos, elRegion, visibleRect)) {\n          fail = 1;\n          points = _newPoints;\n          offset = _newOffset;\n          targetOffset = _newTargetOffset;\n        }\n      }\n    }\n\n    // 如果失败，重新计算当前节点将要被放置的位置\n    if (fail) {\n      elFuturePos = getElFuturePos(elRegion, tgtRegion, points, offset, targetOffset);\n      utils.mix(newElRegion, elFuturePos);\n    }\n    var isStillFailX = isFailX(elFuturePos, elRegion, visibleRect);\n    var isStillFailY = isFailY(elFuturePos, elRegion, visibleRect);\n    // 检查反下后的位置是否可以放下了，如果仍然放不下：\n    // 1. 复原修改过的定位参数\n    if (isStillFailX || isStillFailY) {\n      var _newPoints2 = points;\n\n      // 重置对应部分的翻转逻辑\n      if (isStillFailX) {\n        _newPoints2 = flip(points, /[lr]/gi, {\n          l: 'r',\n          r: 'l'\n        });\n      }\n      if (isStillFailY) {\n        _newPoints2 = flip(points, /[tb]/gi, {\n          t: 'b',\n          b: 't'\n        });\n      }\n      points = _newPoints2;\n      offset = align.offset || [0, 0];\n      targetOffset = align.targetOffset || [0, 0];\n    }\n    // 2. 只有指定了可以调整当前方向才调整\n    newOverflowCfg.adjustX = overflow.adjustX && isStillFailX;\n    newOverflowCfg.adjustY = overflow.adjustY && isStillFailY;\n\n    // 确实要调整，甚至可能会调整高度宽度\n    if (newOverflowCfg.adjustX || newOverflowCfg.adjustY) {\n      newElRegion = adjustForViewport(elFuturePos, elRegion, visibleRect, newOverflowCfg);\n    }\n  }\n\n  // need judge to in case set fixed with in css on height auto element\n  if (newElRegion.width !== elRegion.width) {\n    utils.css(source, 'width', utils.width(source) + newElRegion.width - elRegion.width);\n  }\n  if (newElRegion.height !== elRegion.height) {\n    utils.css(source, 'height', utils.height(source) + newElRegion.height - elRegion.height);\n  }\n\n  // https://github.com/kissyteam/kissy/issues/190\n  // 相对于屏幕位置没变，而 left/top 变了\n  // 例如 <div 'relative'><el absolute></div>\n  utils.offset(source, {\n    left: newElRegion.left,\n    top: newElRegion.top\n  }, {\n    useCssRight: align.useCssRight,\n    useCssBottom: align.useCssBottom,\n    useCssTransform: align.useCssTransform,\n    ignoreShake: align.ignoreShake\n  });\n  return {\n    points: points,\n    offset: offset,\n    targetOffset: targetOffset,\n    overflow: newOverflowCfg\n  };\n}\n/**\n *  2012-04-26 yiminghe@gmail.com\n *   - 优化智能对齐算法\n *   - 慎用 resizeXX\n *\n *  2011-07-13 yiminghe@gmail.com note:\n *   - 增加智能对齐，以及大小调整选项\n **/\n\nfunction isOutOfVisibleRect(target, alwaysByViewport) {\n  var visibleRect = getVisibleRectForElement(target, alwaysByViewport);\n  var targetRegion = getRegion(target);\n  return !visibleRect || targetRegion.left + targetRegion.width <= visibleRect.left || targetRegion.top + targetRegion.height <= visibleRect.top || targetRegion.left >= visibleRect.right || targetRegion.top >= visibleRect.bottom;\n}\nfunction alignElement(el, refNode, align) {\n  var target = align.target || refNode;\n  var refNodeRegion = getRegion(target);\n  var isTargetNotOutOfVisible = !isOutOfVisibleRect(target, align.overflow && align.overflow.alwaysByViewport);\n  return doAlign(el, refNodeRegion, align, isTargetNotOutOfVisible);\n}\nalignElement.__getOffsetParent = getOffsetParent;\nalignElement.__getVisibleRectForElement = getVisibleRectForElement;\n\n/**\n * `tgtPoint`: { pageX, pageY } or { clientX, clientY }.\n * If client position provided, will internal convert to page position.\n */\n\nfunction alignPoint(el, tgtPoint, align) {\n  var pageX;\n  var pageY;\n  var doc = utils.getDocument(el);\n  var win = doc.defaultView || doc.parentWindow;\n  var scrollX = utils.getWindowScrollLeft(win);\n  var scrollY = utils.getWindowScrollTop(win);\n  var viewportWidth = utils.viewportWidth(win);\n  var viewportHeight = utils.viewportHeight(win);\n  if ('pageX' in tgtPoint) {\n    pageX = tgtPoint.pageX;\n  } else {\n    pageX = scrollX + tgtPoint.clientX;\n  }\n  if ('pageY' in tgtPoint) {\n    pageY = tgtPoint.pageY;\n  } else {\n    pageY = scrollY + tgtPoint.clientY;\n  }\n  var tgtRegion = {\n    left: pageX,\n    top: pageY,\n    width: 0,\n    height: 0\n  };\n  var pointInView = pageX >= 0 && pageX <= scrollX + viewportWidth && pageY >= 0 && pageY <= scrollY + viewportHeight;\n\n  // Provide default target point\n  var points = [align.points[0], 'cc'];\n  return doAlign(el, tgtRegion, _objectSpread2(_objectSpread2({}, align), {}, {\n    points: points\n  }), pointInView);\n}\n\nexport default alignElement;\nexport { alignElement, alignPoint };\n//# sourceMappingURL=index.js.map\n"],"sourceRoot":""}