hexo-theme-butterfly/layout/includes/third-party/math/chartjs.pug

- const { fontColor, borderColor, scale_ticks_backdropColor } = theme.chartjs

script.
  (() => {
    const applyThemeDefaultsConfig = theme => {
      if (theme === 'dark-mode') {
        Chart.defaults.color = "!{fontColor.dark}"
        Chart.defaults.borderColor = "!{borderColor.dark}"
        Chart.defaults.scale.ticks.backdropColor = "!{scale_ticks_backdropColor.dark}"
      } else {
        Chart.defaults.color = "!{fontColor.light}"
        Chart.defaults.borderColor = "!{borderColor.light}"
        Chart.defaults.scale.ticks.backdropColor = "!{scale_ticks_backdropColor.light}"
      }
    }

    // Recursively traverse the config object and automatically apply theme-specific color schemes
    const applyThemeConfig = (obj, theme) => {
      if (typeof obj !== 'object' || obj === null) return

      Object.keys(obj).forEach(key => {
        const value = obj[key]
        // If the property is an object and has theme-specific options, apply them
        if (typeof value === 'object' && value !== null) {
          if (theme in value) {
            obj[key] = value[theme] // Apply the value for the current theme
          } else {
            // Recursively process child objects
            applyThemeConfig(value, theme)
          }
        }
      })
    }

    const destroyChart = canvas => {
      const chart = canvas && window.Chart && Chart.getChart(canvas)
      if (chart) chart.destroy()
    }

    const runChartJS = ele => {
      window.loadChartJS = true

      Array.from(ele).forEach((item, index) => {
        const chartSrc = item.firstElementChild
        const chartID = item.getAttribute('data-chartjs-id') || ('chartjs-' + index) // Use custom ID or default ID
        const width = item.getAttribute('data-width')
        const existingCanvas = document.getElementById(chartID)

        // If a canvas already exists, destroy its chart and remove it to avoid rendering duplicates
        if (existingCanvas) {
          destroyChart(existingCanvas)
          existingCanvas.parentNode.remove()
        }

        const chartDefinition = chartSrc.textContent
        const canvas = document.createElement('canvas')
        canvas.id = chartID

        const div = document.createElement('div')
        div.className = 'chartjs-wrap'

        if (width) {
          div.style.width = width
        }

        div.appendChild(canvas)
        chartSrc.insertAdjacentElement('afterend', div)

        const ctx = document.getElementById(chartID).getContext('2d')

        const config = JSON.parse(chartDefinition)

        const theme = document.documentElement.getAttribute('data-theme') === 'dark' ? 'dark-mode' : 'light-mode'

        // Set default styles (initial setup)
        applyThemeDefaultsConfig(theme)

        // Automatically traverse the config and apply dual-mode color schemes
        applyThemeConfig(config, theme)

        new Chart(ctx, config)
      })
    }

    const loadChartJS = () => {
      const chartJSEle = document.querySelectorAll('#article-container .chartjs-container')
      if (chartJSEle.length === 0) return

      window.loadChartJS ? runChartJS(chartJSEle) : btf.getScript('!{url_for(theme.asset.chartjs)}').then(() => runChartJS(chartJSEle))
    }

    // Destroy all charts before navigating away to avoid leaks
    btf.addGlobalFn('pjaxSendOnce', () => {
      document.querySelectorAll('.chartjs-wrap canvas').forEach(destroyChart)
    }, 'chartjs')

    // Listen for theme change events
    btf.addGlobalFn('themeChange', loadChartJS, 'chartjs')
    btf.addGlobalFn('encrypt', loadChartJS, 'chartjs')

    window.pjax ? loadChartJS() : document.addEventListener('DOMContentLoaded', loadChartJS)
  })()