\n
\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\n\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\n if (!skipStatic) {\n return element.nodeName.toLowerCase() === 'html' ? null : getParent(element);\n }\n\n for (parent = getParent(element); parent && parent !== body && parent.nodeType !== 9; parent = getParent(parent)) {\n positionStyle = utils.css(parent, 'position');\n\n if (positionStyle !== 'static') {\n return parent;\n }\n }\n\n return null;\n}\n\nvar getParent$1 = utils.getParent;\n\nfunction isAncestorFixed(element) {\n if (utils.isWindow(element) || element.nodeType === 9) {\n return false;\n }\n\n var doc = utils.getDocument(element);\n var body = doc.body;\n var parent = null;\n\n for (parent = getParent$1(element); parent && parent !== body; parent = getParent$1(parent)) {\n var positionStyle = utils.css(parent, 'position');\n\n if (positionStyle === 'fixed') {\n return true;\n }\n }\n\n return false;\n}\n/**\n * 获得元素的显示部分的区域\n */\n\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; // Determine the size of the visible rect by climbing the dom accounting for\n // all scrollable containers.\n\n while (el) {\n // clientWidth is zero for inline block elements in ie.\n if ((navigator.userAgent.indexOf('MSIE') === -1 || el.clientWidth !== 0) && // 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); // add border\n\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, // 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\n el = getOffsetParent(el);\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\n\n var originalPosition = null;\n\n if (!utils.isWindow(element) && element.nodeType !== 9) {\n originalPosition = element.style.position;\n var position = utils.css(element, 'position');\n\n if (position === 'absolute') {\n element.style.position = 'fixed';\n }\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; // scrollXXX on html is sync with body which means overflow: hidden on body gets wrong scrollXXX.\n // We should cut this ourself.\n\n var bodyStyle = window.getComputedStyle(body);\n\n if (bodyStyle.overflowX === 'hidden') {\n documentWidth = win.innerWidth;\n }\n\n if (bodyStyle.overflowY === 'hidden') {\n documentHeight = win.innerHeight;\n } // Reset element position after calculate the visible area\n\n\n if (element.style) {\n element.style.position = originalPosition;\n }\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\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\n if (overflow.adjustX && pos.left < visibleRect.left) {\n pos.left = visibleRect.left;\n } // Left edge inside and right edge outside viewport, try to resize it.\n\n\n if (overflow.resizeWidth && pos.left >= visibleRect.left && pos.left + size.width > visibleRect.right) {\n size.width -= pos.left + size.width - visibleRect.right;\n } // Right edge outside viewport, try to move it.\n\n\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 } // Top edge outside viewport, try to move it.\n\n\n if (overflow.adjustY && pos.top < visibleRect.top) {\n pos.top = visibleRect.top;\n } // Top edge inside and bottom edge outside viewport, try to resize it.\n\n\n if (overflow.resizeHeight && pos.top >= visibleRect.top && pos.top + size.height > visibleRect.bottom) {\n size.height -= pos.top + size.height - visibleRect.bottom;\n } // Bottom edge outside viewport, try to move it.\n\n\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\n return utils.mix(pos, size);\n}\n\nfunction getRegion(node) {\n var offset;\n var w;\n var h;\n\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\n offset.width = w;\n offset.height = h;\n return offset;\n}\n/**\n * 获取 node 上的 align 对齐点 相对于页面的坐标\n */\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\n if (V === 'c') {\n y += h / 2;\n } else if (V === 'b') {\n y += h;\n }\n\n if (H === 'c') {\n x += w / 2;\n } else if (H === 'r') {\n x += w;\n }\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 * align dom node flexibly\n * @author yiminghe@gmail.com\n */\n\n\nfunction isFailX(elFuturePos, elRegion, visibleRect) {\n return elFuturePos.left < visibleRect.left || elFuturePos.left + elRegion.width > visibleRect.right;\n}\n\nfunction isFailY(elFuturePos, elRegion, visibleRect) {\n return elFuturePos.top < visibleRect.top || elFuturePos.top + elRegion.height > visibleRect.bottom;\n}\n\nfunction isCompleteFailX(elFuturePos, elRegion, visibleRect) {\n return elFuturePos.left > visibleRect.right || elFuturePos.left + elRegion.width < visibleRect.left;\n}\n\nfunction isCompleteFailY(elFuturePos, elRegion, visibleRect) {\n return elFuturePos.top > visibleRect.bottom || elFuturePos.top + elRegion.height < visibleRect.top;\n}\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}\n\nfunction flipOffset(offset, index) {\n offset[index] = -offset[index];\n return offset;\n}\n\nfunction convertOffset(str, offsetLen) {\n var n;\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\n return n || 0;\n}\n\nfunction normalizeOffset(offset, el) {\n offset[0] = convertOffset(offset[0], el.width);\n offset[1] = convertOffset(offset[1], el.height);\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 */\n\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); // 当前节点可以被放置的显示区域\n\n var visibleRect = getVisibleRectForElement(source, alwaysByViewport); // 当前节点所占的区域, left/top/width/height\n\n var elRegion = getRegion(source); // 将 offset 转换成数值，支持百分比\n\n normalizeOffset(offset, elRegion);\n normalizeOffset(targetOffset, tgtRegion); // 当前节点将要被放置的位置\n\n var elFuturePos = getElFuturePos(elRegion, tgtRegion, points, offset, targetOffset); // 当前节点将要所处的区域\n\n var newElRegion = utils.merge(elRegion, elFuturePos); // 如果可视区域不能完全放置当前节点时允许调整\n\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 }); // 偏移量也反下\n\n var newOffset = flipOffset(offset, 0);\n var newTargetOffset = flipOffset(targetOffset, 0);\n var newElFuturePos = getElFuturePos(elRegion, tgtRegion, newPoints, newOffset, newTargetOffset);\n\n if (!isCompleteFailX(newElFuturePos, elRegion, visibleRect)) {\n fail = 1;\n points = newPoints;\n offset = newOffset;\n targetOffset = newTargetOffset;\n }\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 }); // 偏移量也反下\n\n\n var _newOffset = flipOffset(offset, 1);\n\n var _newTargetOffset = flipOffset(targetOffset, 1);\n\n var _newElFuturePos = getElFuturePos(elRegion, tgtRegion, _newPoints, _newOffset, _newTargetOffset);\n\n if (!isCompleteFailY(_newElFuturePos, elRegion, visibleRect)) {\n fail = 1;\n points = _newPoints;\n offset = _newOffset;\n targetOffset = _newTargetOffset;\n }\n }\n } // 如果失败，重新计算当前节点将要被放置的位置\n\n\n if (fail) {\n elFuturePos = getElFuturePos(elRegion, tgtRegion, points, offset, targetOffset);\n utils.mix(newElRegion, elFuturePos);\n }\n\n var isStillFailX = isFailX(elFuturePos, elRegion, visibleRect);\n var isStillFailY = isFailY(elFuturePos, elRegion, visibleRect); // 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\n if (isStillFailX || isStillFailY) {\n var _newPoints2 = points; // 重置对应部分的翻转逻辑\n\n if (isStillFailX) {\n _newPoints2 = flip(points, /[lr]/gi, {\n l: 'r',\n r: 'l'\n });\n }\n\n if (isStillFailY) {\n _newPoints2 = flip(points, /[tb]/gi, {\n t: 'b',\n b: 't'\n });\n }\n\n points = _newPoints2;\n offset = align.offset || [0, 0];\n targetOffset = align.targetOffset || [0, 0];\n } // 2. 只有指定了可以调整当前方向才调整\n\n\n newOverflowCfg.adjustX = overflow.adjustX && isStillFailX;\n newOverflowCfg.adjustY = overflow.adjustY && isStillFailY; // 确实要调整，甚至可能会调整高度宽度\n\n if (newOverflowCfg.adjustX || newOverflowCfg.adjustY) {\n newElRegion = adjustForViewport(elFuturePos, elRegion, visibleRect, newOverflowCfg);\n }\n } // need judge to in case set fixed with in css on height auto element\n\n\n if (newElRegion.width !== elRegion.width) {\n utils.css(source, 'width', utils.width(source) + newElRegion.width - elRegion.width);\n }\n\n if (newElRegion.height !== elRegion.height) {\n utils.css(source, 'height', utils.height(source) + newElRegion.height - elRegion.height);\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 \n 元素 6 高 100px 宽 50px
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