113 lines
2.4 KiB
JavaScript
113 lines
2.4 KiB
JavaScript
function scroll (offsetTop) {
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[document.body, document.documentElement].forEach((ele) => {
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// eslint-disable-next-line
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TweenLite.to(
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ele,
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0.4,
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{
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scrollTop: offsetTop,
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ease: Power2.easeOut // eslint-disable-line
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}
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)
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})
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}
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function getAttrTag (line) {
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return `[data-source-line="${line}"]`
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}
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function getPreLineOffsetTop (line) {
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let currentLine = line - 1
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let ele = null
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while (currentLine > 0 && !ele) {
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ele = document.querySelector(getAttrTag(currentLine))
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if (!ele) {
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currentLine -= 1
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}
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}
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return [
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currentLine >= 0 ? currentLine : 0,
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ele ? ele.offsetTop : 0
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]
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}
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function getNextLineOffsetTop (line, len) {
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let currentLine = line + 1
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let ele = null
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while (currentLine < len && !ele) {
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ele = document.querySelector(getAttrTag(currentLine))
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if (!ele) {
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currentLine += 1
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}
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}
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return [
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currentLine < len ? currentLine : len - 1,
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ele ? ele.offsetTop : document.documentElement.scrollHeight
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]
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}
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function topOrBottom (line, len) {
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if (line === 0) {
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scroll(0)
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} else if (line === len - 1) {
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scroll(document.documentElement.scrollHeight)
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}
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}
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function relativeScroll (line, ratio, len) {
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let offsetTop = 0
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const lineEle = document.querySelector(`[data-source-line="${line}"]`)
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if (lineEle) {
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offsetTop = lineEle.offsetTop
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} else {
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const pre = getPreLineOffsetTop(line)
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const next = getNextLineOffsetTop(line, len)
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offsetTop = pre[1] + ((next[1] - pre[1]) * (line - pre[0]) / (next[0] - pre[0]))
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}
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scroll(offsetTop - document.documentElement.clientHeight * ratio)
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}
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export default {
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relative: function ({
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cursor,
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winline,
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winheight,
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len
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}) {
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const line = cursor - 1
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const ratio = winline / winheight
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if (line === 0 || line === len - 1) {
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topOrBottom(line, len)
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} else {
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relativeScroll(line, ratio, len)
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}
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},
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middle: function ({
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cursor,
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// winline,
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// winheight,
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len
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}) {
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const line = cursor - 1
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if (line === 0 || line === len - 1) {
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topOrBottom(line, len)
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} else {
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relativeScroll(line, 0.5, len)
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}
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},
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top: function ({
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cursor,
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winline,
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// winheight,
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len
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}) {
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let line = cursor - 1
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if (line === 0 || line === len - 1) {
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topOrBottom(line, len)
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} else {
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line = cursor - winline
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relativeScroll(line, 0, len)
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}
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}
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}
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