element-plus/es/components/watermark/src/watermark2.mjs.map

A Component Library for Vue 3

{"version":3,"file":"watermark2.mjs","sources":["../../../../../../packages/components/watermark/src/watermark.vue"],"sourcesContent":["<template>\n  <div ref=\"containerRef\" :style=\"[style]\">\n    <slot />\n  </div>\n</template>\n\n<script lang=\"ts\" setup>\nimport {\n  computed,\n  onBeforeUnmount,\n  onMounted,\n  ref,\n  shallowRef,\n  watch,\n} from 'vue'\nimport { useMutationObserver } from '@vueuse/core'\nimport { watermarkProps } from './watermark'\nimport { getPixelRatio, getStyleStr, reRendering } from './utils'\nimport useClips, { FontGap } from './useClips'\nimport type { WatermarkProps } from './watermark'\nimport type { CSSProperties } from 'vue'\n\ndefineOptions({\n  name: 'ElWatermark',\n})\n\nconst style: CSSProperties = {\n  position: 'relative',\n}\n\nconst props = defineProps(watermarkProps)\nconst color = computed(() => props.font?.color ?? 'rgba(0,0,0,.15)')\nconst fontSize = computed(() => props.font?.fontSize ?? 16)\nconst fontWeight = computed(() => props.font?.fontWeight ?? 'normal')\nconst fontStyle = computed(() => props.font?.fontStyle ?? 'normal')\nconst fontFamily = computed(() => props.font?.fontFamily ?? 'sans-serif')\nconst textAlign = computed(() => props.font?.textAlign ?? 'center')\nconst textBaseline = computed(() => props.font?.textBaseline ?? 'top')\n\nconst gapX = computed(() => props.gap[0])\nconst gapY = computed(() => props.gap[1])\nconst gapXCenter = computed(() => gapX.value / 2)\nconst gapYCenter = computed(() => gapY.value / 2)\nconst offsetLeft = computed(() => props.offset?.[0] ?? gapXCenter.value)\nconst offsetTop = computed(() => props.offset?.[1] ?? gapYCenter.value)\n\nconst getMarkStyle = () => {\n  const markStyle: CSSProperties = {\n    zIndex: props.zIndex,\n    position: 'absolute',\n    left: 0,\n    top: 0,\n    width: '100%',\n    height: '100%',\n    pointerEvents: 'none',\n    backgroundRepeat: 'repeat',\n  }\n\n  /** Calculate the style of the offset */\n  let positionLeft = offsetLeft.value - gapXCenter.value\n  let positionTop = offsetTop.value - gapYCenter.value\n  if (positionLeft > 0) {\n    markStyle.left = `${positionLeft}px`\n    markStyle.width = `calc(100% - ${positionLeft}px)`\n    positionLeft = 0\n  }\n  if (positionTop > 0) {\n    markStyle.top = `${positionTop}px`\n    markStyle.height = `calc(100% - ${positionTop}px)`\n    positionTop = 0\n  }\n  markStyle.backgroundPosition = `${positionLeft}px ${positionTop}px`\n\n  return markStyle\n}\n\nconst containerRef = shallowRef<HTMLDivElement | null>(null)\nconst watermarkRef = shallowRef<HTMLDivElement>()\nconst stopObservation = ref(false)\n\nconst destroyWatermark = () => {\n  if (watermarkRef.value) {\n    watermarkRef.value.remove()\n    watermarkRef.value = undefined\n  }\n}\nconst appendWatermark = (base64Url: string, markWidth: number) => {\n  if (containerRef.value && watermarkRef.value) {\n    stopObservation.value = true\n    watermarkRef.value.setAttribute(\n      'style',\n      getStyleStr({\n        ...getMarkStyle(),\n        backgroundImage: `url('${base64Url}')`,\n        backgroundSize: `${Math.floor(markWidth)}px`,\n      })\n    )\n    containerRef.value?.append(watermarkRef.value)\n    // Delayed execution\n    setTimeout(() => {\n      stopObservation.value = false\n    })\n  }\n}\n\n/**\n * Get the width and height of the watermark. The default values are as follows\n * Image: [120, 64]; Content: It's calculated by content;\n */\nconst getMarkSize = (ctx: CanvasRenderingContext2D) => {\n  let defaultWidth = 120\n  let defaultHeight = 64\n  const image = props.image\n  const content = props.content\n  const width = props.width\n  const height = props.height\n  if (!image && ctx.measureText) {\n    ctx.font = `${Number(fontSize.value)}px ${fontFamily.value}`\n    const contents = Array.isArray(content) ? content : [content]\n    const sizes = contents.map((item) => {\n      const metrics = ctx.measureText(item!)\n\n      return [\n        metrics.width,\n        // Using `actualBoundingBoxAscent` to be compatible with lower version browsers (eg: Firefox < 116)\n        metrics.fontBoundingBoxAscent !== undefined\n          ? metrics.fontBoundingBoxAscent + metrics.fontBoundingBoxDescent\n          : metrics.actualBoundingBoxAscent + metrics.actualBoundingBoxDescent,\n      ]\n    })\n    defaultWidth = Math.ceil(Math.max(...sizes.map((size) => size[0])))\n    defaultHeight =\n      Math.ceil(Math.max(...sizes.map((size) => size[1]))) * contents.length +\n      (contents.length - 1) * FontGap\n  }\n  return [width ?? defaultWidth, height ?? defaultHeight] as const\n}\n\nconst getClips = useClips()\n\nconst renderWatermark = () => {\n  const canvas = document.createElement('canvas')\n  const ctx = canvas.getContext('2d')\n  const image = props.image\n  const content = props.content\n  const rotate = props.rotate\n\n  if (ctx) {\n    if (!watermarkRef.value) {\n      watermarkRef.value = document.createElement('div')\n    }\n\n    const ratio = getPixelRatio()\n    const [markWidth, markHeight] = getMarkSize(ctx)\n\n    const drawCanvas = (\n      drawContent?: NonNullable<WatermarkProps['content']> | HTMLImageElement\n    ) => {\n      const [textClips, clipWidth] = getClips(\n        drawContent || '',\n        rotate,\n        ratio,\n        markWidth,\n        markHeight,\n        {\n          color: color.value,\n          fontSize: fontSize.value,\n          fontStyle: fontStyle.value,\n          fontWeight: fontWeight.value,\n          fontFamily: fontFamily.value,\n          textAlign: textAlign.value,\n          textBaseline: textBaseline.value,\n        },\n        gapX.value,\n        gapY.value\n      )\n\n      appendWatermark(textClips, clipWidth)\n    }\n\n    if (image) {\n      const img = new Image()\n      img.onload = () => {\n        drawCanvas(img)\n      }\n      img.onerror = () => {\n        drawCanvas(content)\n      }\n      img.crossOrigin = 'anonymous'\n      img.referrerPolicy = 'no-referrer'\n      img.src = image\n    } else {\n      drawCanvas(content)\n    }\n  }\n}\n\nonMounted(() => {\n  renderWatermark()\n})\n\nwatch(\n  () => props,\n  () => {\n    renderWatermark()\n  },\n  {\n    deep: true,\n    flush: 'post',\n  }\n)\n\nonBeforeUnmount(() => {\n  destroyWatermark()\n})\n\nconst onMutate = (mutations: MutationRecord[]) => {\n  if (stopObservation.value) {\n    return\n  }\n  mutations.forEach((mutation) => {\n    if (reRendering(mutation, watermarkRef.value)) {\n      destroyWatermark()\n      renderWatermark()\n    }\n  })\n}\n\nuseMutationObserver(containerRef, onMutate, {\n  attributes: true,\n  subtree: true,\n  childList: 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