| 1 | 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align.charAt(0);\n const H = align.charAt(1);\n const w = region.width;\n const h = region.height;\n let x = region.left;\n let y = region.top;\n if (V === 'c') {\n y += h / 2;\n }\n else if (V === 'b') {\n y += h;\n }\n if (H === 'c') {\n x += w / 2;\n }\n else if (H === 'r') {\n x += w;\n }\n return {\n left: x,\n top: y,\n };\n}\nfunction getElFuturePos(elRegion, refNodeRegion, points, offset, targetOffset) {\n const p1 = getAlignOffset(refNodeRegion, points[1]);\n const p2 = getAlignOffset(elRegion, points[0]);\n const diff = [p2.left - p1.left, p2.top - p1.top];\n return {\n left: elRegion.left - diff[0] + offset[0] - targetOffset[0],\n top: elRegion.top - diff[1] + offset[1] - targetOffset[1],\n };\n}\nfunction adjustForViewport(elFuturePos, elRegion, visibleRect, overflow) {\n const pos = { ...elFuturePos };\n const 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 // Left edge inside and right edge outside viewport, try to resize it.\n if (overflow.resizeWidth &&\n pos.left >= visibleRect.left &&\n pos.left + size.width > visibleRect.right) {\n size.width -= pos.left + size.width - visibleRect.right;\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 // Top edge outside viewport, try to move it.\n if (overflow.adjustY && pos.top < visibleRect.top) {\n pos.top = visibleRect.top;\n }\n // Top edge inside and bottom edge outside viewport, try to resize it.\n if (overflow.resizeHeight &&\n pos.top >= visibleRect.top &&\n pos.top + size.height > visibleRect.bottom) {\n size.height -= pos.top + size.height - visibleRect.bottom;\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 Object.assign(pos, size);\n}\n// function isFixedPosition(node: HTMLElement): boolean {\n// const { offsetParent, ownerDocument } = node;\n// if (\n// ownerDocument &&\n// offsetParent === ownerDocument.body &&\n// ownerDocument.defaultView &&\n// ownerDocument.defaultView.getComputedStyle(node).position !== 'fixed'\n// ) {\n// return false;\n// }\n// if (offsetParent) {\n// return isFixedPosition(offsetParent as HTMLElement);\n// }\n// return true;\n// }\nexport default function (el, refNode, align) {\n let points = align.points;\n let offset = (align.offset || [0, 0]).slice();\n let targetOffset = (align.targetOffset || [0, 0]).slice();\n const overflow = align.overflow || {};\n const target = align.target || refNode;\n const source = align.source || el;\n const newOverflowCfg = {};\n let fail = 0;\n const visibleRect = getVisibleRectForElement();\n const elRegion = getRegion(source);\n const refNodeRegion = getRegion(target);\n let elFuturePos = getElFuturePos(elRegion, refNodeRegion, points, offset, targetOffset);\n let newElRegion = Object.assign(elRegion, elFuturePos);\n const isTargetNotOutOfVisible = !isOutOfVisibleRect(target);\n if (visibleRect && (overflow.adjustX || overflow.adjustY) && isTargetNotOutOfVisible) {\n if (overflow.adjustX) {\n if (isFailX(elFuturePos, elRegion, visibleRect)) {\n const newPoints = flip(points, /[lr]/gi, {\n l: 'r',\n r: 'l',\n });\n const newOffset = flipOffset(offset, 0);\n const newTargetOffset = flipOffset(targetOffset, 0);\n const newElFuturePos = getElFuturePos(elRegion, refNodeRegion, 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 if (isFailY(elFuturePos, elRegion, visibleRect)) {\n const _newPoints = flip(points, /[tb]/gi, {\n t: 'b',\n b: 't',\n });\n const _newOffset = flipOffset(offset, 1);\n const _newTargetOffset = flipOffset(targetOffset, 1);\n const _newElFuturePos = getElFuturePos(elRegion, refNodeRegion, _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 if (fail) {\n elFuturePos = getElFuturePos(elRegion, refNodeRegion, points, offset, targetOffset);\n Object.assign(newElRegion, elFuturePos);\n }\n newOverflowCfg.adjustX = overflow.adjustX && isFailX(elFuturePos, elRegion, visibleRect);\n newOverflowCfg.adjustY = overflow.adjustY && isFailY(elFuturePos, elRegion, visibleRect);\n if (newOverflowCfg.adjustX || newOverflowCfg.adjustY) {\n newElRegion = adjustForViewport(elFuturePos, elRegion, visibleRect, newOverflowCfg);\n }\n }\n const { width, height } = newElRegion;\n if (width !== elRegion.width) {\n source.style.width = width ? pxToRem(width) : '0';\n }\n if (height !== elRegion.height) {\n source.style.height = height ? pxToRem(height) : '0';\n }\n // const isTargetFixed = isFixedPosition(target);\n const { offsetParent } = source;\n if (offsetParent) {\n const { left, top } = offsetParent.getBoundingClientRect();\n newElRegion.left -= left;\n newElRegion.top -= top;\n }\n Object.assign(source.style, {\n left: pxToRem(newElRegion.left),\n top: pxToRem(newElRegion.top),\n });\n // if (isTargetFixed) {\n // source.style.position = 'fixed';\n // } else {\n // source.style.position = '';\n // }\n return {\n points,\n offset,\n targetOffset,\n overflow: newOverflowCfg,\n };\n}\n"],"file":"domAlign.js"} |