mirror of
https://github.com/jerryc127/hexo-theme-butterfly.git
synced 2026-08-08 19:48:42 +08:00
365 lines
14 KiB
Plaintext
365 lines
14 KiB
Plaintext
script.
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(() => {
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const parseViewBox = viewBox => {
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if (!viewBox) return null
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const parts = viewBox.trim().split(/[\s,]+/).map(n => Number(n))
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if (parts.length !== 4 || parts.some(n => Number.isNaN(n))) return null
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return parts
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}
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const getSvgViewBox = svg => {
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const attr = parseViewBox(svg.getAttribute('viewBox'))
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if (attr) return attr
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// Fallback: use bbox to build a viewBox
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try {
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const bbox = svg.getBBox()
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if (bbox && bbox.width && bbox.height) return [bbox.x, bbox.y, bbox.width, bbox.height]
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} catch (e) {
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// getBBox may fail on some edge cases; ignore
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}
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const w = Number(svg.getAttribute('width')) || 0
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const h = Number(svg.getAttribute('height')) || 0
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if (w > 0 && h > 0) return [0, 0, w, h]
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return [0, 0, 100, 100]
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}
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const setSvgViewBox = (svg, vb) => {
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svg.setAttribute('viewBox', `${vb[0]} ${vb[1]} ${vb[2]} ${vb[3]}`)
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}
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const clamp = (v, min, max) => Math.max(min, Math.min(max, v))
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const openSvgInNewTab = ({ source, initViewBox }) => {
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const getClonedSvg = () => {
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if (typeof source === 'string') {
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const template = document.createElement('template')
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template.innerHTML = source.trim()
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const svg = template.content.querySelector('svg')
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return svg ? svg.cloneNode(true) : null
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}
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if (source && typeof source.cloneNode === 'function') {
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return source.cloneNode(true)
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}
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return null
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}
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const clone = getClonedSvg()
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if (!clone) return
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if (initViewBox && initViewBox.length === 4) {
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clone.setAttribute('viewBox', initViewBox.join(' '))
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}
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if (!clone.getAttribute('xmlns')) clone.setAttribute('xmlns', 'http://www.w3.org/2000/svg')
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if (!clone.getAttribute('xmlns:xlink') && clone.innerHTML.includes('xlink:')) {
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clone.setAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink')
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}
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// inject background to match current theme
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const isDark = document.documentElement.getAttribute('data-theme') === 'dark'
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const bg = getComputedStyle(document.body).backgroundColor || (isDark ? '#1e1e1e' : '#ffffff')
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if (!clone.style.background) clone.style.background = bg
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const serializer = new XMLSerializer()
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const svgSource = serializer.serializeToString(clone)
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const htmlSource = `<!doctype html><html><head><meta charset="utf-8" />
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<style>
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html, body { width: 100%; height: 100%; margin: 0; display: flex; align-items: center; justify-content: center; background: ${bg}; }
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svg { max-width: 100%; max-height: 100%; height: auto; width: auto; }
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</style>
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</head><body>${svgSource}</body></html>`
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const blob = new Blob([htmlSource], { type: 'text/html;charset=utf-8' })
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const url = URL.createObjectURL(blob)
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window.open(url, '_blank', 'noopener')
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setTimeout(() => URL.revokeObjectURL(url), 5000)
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}
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const attachMermaidViewerButton = wrap => {
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let btn = wrap.querySelector('.mermaid-open-btn')
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if (!btn) {
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btn = document.createElement('button')
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btn.type = 'button'
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btn.className = 'mermaid-open-btn'
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wrap.appendChild(btn)
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}
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btn.innerHTML = '<i class="fa fa-search fa-fw" aria-hidden="true"></i>'
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if (!btn.__mermaidViewerBound) {
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btn.addEventListener('click', e => {
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e.preventDefault()
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e.stopPropagation()
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const svg = wrap.__mermaidOriginalSvg || wrap.querySelector('svg')
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if (!svg) return
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const initViewBox = wrap.__mermaidInitViewBox
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openSvgInNewTab({ source: svg, initViewBox })
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})
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btn.__mermaidViewerBound = true
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}
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}
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// Zoom around a point (px, py) in the SVG viewport (in viewBox coordinates)
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const zoomAtPoint = (vb, factor, px, py) => {
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const w = vb[2] * factor
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const h = vb[3] * factor
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const nx = px - (px - vb[0]) * factor
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const ny = py - (py - vb[1]) * factor
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return [nx, ny, w, h]
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}
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const initMermaidGestures = wrap => {
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// Clean up previous event listeners and pending frames
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if (wrap.__mermaidAbortController) {
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wrap.__mermaidAbortController.abort()
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if (wrap.__mermaidRafId) cancelAnimationFrame(wrap.__mermaidRafId)
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}
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const ac = new AbortController()
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wrap.__mermaidAbortController = ac
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const svg = wrap.querySelector('svg')
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if (!svg) return
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// Ensure viewBox exists so gestures always work
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const initVb = getSvgViewBox(svg)
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wrap.__mermaidInitViewBox = initVb
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wrap.__mermaidCurViewBox = initVb.slice()
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setSvgViewBox(svg, initVb)
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// Disable default gestures to prevent scroll chaining and pinch-zoom penetration in Chrome
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svg.style.touchAction = 'none'
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// Cache BoundingClientRect, throttled on scroll to reduce reflow
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let cachedRect = svg.getBoundingClientRect()
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let rectDirty = false
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const markRectDirty = () => { rectDirty = true }
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window.addEventListener('resize', markRectDirty, { signal: ac.signal })
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window.addEventListener('scroll', markRectDirty, { signal: ac.signal, capture: true })
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const getRect = () => {
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if (rectDirty) {
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cachedRect = svg.getBoundingClientRect()
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rectDirty = false
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}
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return cachedRect
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}
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// Precompute clamp bounds from initial viewBox
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const minW = initVb[2] * 0.1
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const maxW = initVb[2] * 10
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const minH = initVb[3] * 0.1
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const maxH = initVb[3] * 10
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const clampVb = vb => {
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const out = vb.slice()
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out[2] = clamp(out[2], minW, maxW)
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out[3] = clamp(out[3], minH, maxH)
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return out
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}
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// Throttle DOM updates using requestAnimationFrame
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let pendingVb = null
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let rafId = null
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const applyVb = () => {
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if (pendingVb) {
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wrap.__mermaidCurViewBox = pendingVb
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setSvgViewBox(svg, pendingVb)
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pendingVb = null
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}
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rafId = null
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wrap.__mermaidRafId = null
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}
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const setCurVb = vb => {
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pendingVb = clampVb(vb)
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if (!rafId) {
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rafId = requestAnimationFrame(applyVb)
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wrap.__mermaidRafId = rafId
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}
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}
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const state = {
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pointers: new Map(),
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startVb: null,
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startDist: 0,
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lastPointerX: 0,
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lastPointerY: 0
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}
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const onPointerDown = e => {
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if (e.pointerType === 'mouse' && e.button !== 0) return
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svg.setPointerCapture(e.pointerId)
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const curVb = wrap.__mermaidCurViewBox
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state.pointers.set(e.pointerId, { x: e.clientX, y: e.clientY })
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if (state.pointers.size === 1) {
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state.startVb = curVb.slice()
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state.lastPointerX = e.clientX
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state.lastPointerY = e.clientY
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} else if (state.pointers.size === 2) {
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const pts = [...state.pointers.values()]
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const dx = pts[0].x - pts[1].x
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const dy = pts[0].y - pts[1].y
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state.startDist = Math.hypot(dx, dy)
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state.startVb = curVb.slice()
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}
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}
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const onPointerMove = e => {
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if (!state.pointers.has(e.pointerId)) return
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state.pointers.set(e.pointerId, { x: e.clientX, y: e.clientY })
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const curVb = wrap.__mermaidCurViewBox
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const rect = getRect()
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if (state.pointers.size === 1 && state.startVb) {
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const p = state.pointers.values().next().value
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const dxClient = p.x - state.lastPointerX
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const dyClient = p.y - state.lastPointerY
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state.lastPointerX = p.x
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state.lastPointerY = p.y
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const dx = dxClient * (curVb[2] / rect.width)
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const dy = dyClient * (curVb[3] / rect.height)
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setCurVb([curVb[0] - dx, curVb[1] - dy, curVb[2], curVb[3]])
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return
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}
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if (state.pointers.size === 2 && state.startVb && state.startDist > 0) {
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const pts = [...state.pointers.values()]
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const dx = pts[0].x - pts[1].x
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const dy = pts[0].y - pts[1].y
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const dist = Math.hypot(dx, dy)
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if (!dist) return
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const factor = state.startDist / dist
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const cx = (pts[0].x + pts[1].x) / 2
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const cy = (pts[0].y + pts[1].y) / 2
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const px = curVb[0] + (cx - rect.left) * (curVb[2] / rect.width)
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const py = curVb[1] + (cy - rect.top) * (curVb[3] / rect.height)
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setCurVb(zoomAtPoint(state.startVb, factor, px, py))
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}
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}
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const onPointerUpOrCancel = e => {
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// Release PointerCapture to avoid event capture anomalies
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if (svg.hasPointerCapture && svg.hasPointerCapture(e.pointerId)) {
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svg.releasePointerCapture(e.pointerId)
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}
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state.pointers.delete(e.pointerId)
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if (state.pointers.size === 0) {
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state.startVb = null
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state.startDist = 0
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} else if (state.pointers.size === 1) {
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const p = state.pointers.values().next().value
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state.lastPointerX = p.x
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state.lastPointerY = p.y
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}
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}
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const onWheel = e => {
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// Prevent event bubbling from triggering external scroll
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e.preventDefault()
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e.stopPropagation()
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// Normalize deltaY across deltaMode (Chrome uses pixels, Safari uses lines)
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let delta = e.deltaY
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if (e.deltaMode === 1) delta *= 16
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else if (e.deltaMode === 2) delta *= 400
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// Continuous zoom factor: smoother than fixed 1.1/0.9 steps
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const zoomFactor = Math.pow(1.001, delta)
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const curVb = wrap.__mermaidCurViewBox
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const rect = getRect()
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const px = curVb[0] + (e.clientX - rect.left) * (curVb[2] / rect.width)
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const py = curVb[1] + (e.clientY - rect.top) * (curVb[3] / rect.height)
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setCurVb(zoomAtPoint(curVb, zoomFactor, px, py))
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}
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const onDblClick = () => {
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const init = wrap.__mermaidInitViewBox
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if (init) setCurVb(init)
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}
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svg.addEventListener('pointerdown', onPointerDown, { signal: ac.signal })
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svg.addEventListener('pointermove', onPointerMove, { signal: ac.signal })
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svg.addEventListener('pointerup', onPointerUpOrCancel, { signal: ac.signal })
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svg.addEventListener('pointercancel', onPointerUpOrCancel, { signal: ac.signal })
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svg.addEventListener('wheel', onWheel, { passive: false, signal: ac.signal })
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svg.addEventListener('dblclick', onDblClick, { signal: ac.signal })
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}
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const runMermaid = ele => {
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window.loadMermaid = true
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const theme = document.documentElement.getAttribute('data-theme') === 'dark' ? '!{theme.mermaid.theme.dark}' : '!{theme.mermaid.theme.light}'
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ele.forEach((item, index) => {
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const mermaidSrc = item.firstElementChild
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// Clean up event listeners before removing old SVG
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if (item.__mermaidAbortController) {
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item.__mermaidAbortController.abort()
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}
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const oldSvg = item.querySelector('svg')
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if (oldSvg) oldSvg.remove()
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let config = {}
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try {
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config = mermaidSrc.dataset.config ? JSON.parse(mermaidSrc.dataset.config) : {}
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} catch (e) {
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console.warn('[mermaid] failed to parse dataset.config:', e)
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}
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if (!config.theme) {
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config.theme = theme
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}
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const mermaidThemeConfig = `%%{init: ${JSON.stringify(config)}}%%\n`
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const mermaidID = `mermaid-${index}`
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const mermaidDefinition = mermaidThemeConfig + mermaidSrc.textContent
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const renderMermaid = svg => {
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mermaidSrc.insertAdjacentHTML('afterend', svg)
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if (!{theme.mermaid.zoom_pan}) initMermaidGestures(item)
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item.__mermaidOriginalSvg = svg
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if (!{theme.mermaid.open_in_new_tab}) attachMermaidViewerButton(item)
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}
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const handleError = err => {
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console.error(`[mermaid] render failed for block #${index}:`, err)
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const errorEl = document.createElement('div')
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errorEl.className = 'mermaid-error'
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errorEl.textContent = `Mermaid render error: ${err.message || err}`
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mermaidSrc.insertAdjacentElement('afterend', errorEl)
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}
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try {
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const renderFn = mermaid.render(mermaidID, mermaidDefinition)
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// mermaid v9 and v10 compatibility
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if (typeof renderFn === 'string') {
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renderMermaid(renderFn)
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} else {
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renderFn.then(({ svg }) => renderMermaid(svg)).catch(handleError)
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}
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} catch (err) {
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handleError(err)
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}
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})
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}
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const codeToMermaid = $article => {
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const codeMermaidEle = $article.querySelectorAll('pre > code.mermaid')
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if (codeMermaidEle.length === 0) return
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codeMermaidEle.forEach(ele => {
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const preEle = document.createElement('pre')
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preEle.className = 'mermaid-src'
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preEle.hidden = true
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preEle.textContent = ele.textContent
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const newEle = document.createElement('div')
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newEle.className = 'mermaid-wrap'
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newEle.appendChild(preEle)
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ele.parentNode.replaceWith(newEle)
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})
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}
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const loadMermaid = () => {
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const $article = document.getElementById('article-container')
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if (!$article) return
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if (!{theme.mermaid.code_write}) codeToMermaid($article)
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const $mermaid = $article.querySelectorAll('.mermaid-wrap')
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if ($mermaid.length === 0) return
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const runMermaidFn = () => runMermaid($mermaid)
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btf.addGlobalFn('themeChange', runMermaidFn, 'mermaid')
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window.loadMermaid ? runMermaidFn() : btf.getScript('!{url_for(theme.asset.mermaid)}').then(runMermaidFn)
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}
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btf.addGlobalFn('encrypt', loadMermaid, 'mermaid')
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window.pjax ? loadMermaid() : document.addEventListener('DOMContentLoaded', loadMermaid)
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})()
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