FranklinWH-wiki/docs/.vitepress/theme/components/ExcalidrawView.vue

<template>
  <div ref="canvasContainer" class="excalidraw-wrapper" @click="showCanvasTop" />
  <div ref="canvasFloating" v-if="showFullView" class="floating-canvas" @click="closeFullView" />
</template>

<script setup lang="ts">
import { onMounted, ref, nextTick } from 'vue'
import { withBase } from 'vitepress';
import { exportToCanvas } from '@excalidraw/excalidraw'
import { ExportedDataState } from '@excalidraw/excalidraw/data/types'

interface Props {
  filePath: string;
}

const props = defineProps<Props>()

const canvasContainer = ref<HTMLCanvasElement | null>(null)
const canvasFloating = ref<HTMLCanvasElement | null>(null)

const showFullView = ref(false);

let excalidrawJson: ExportedDataState | undefined = undefined

function showCanvasTop() {
  showFullView.value = true;

  // 等待 DOM 渲染后复制内容
  nextTick(async () => {
    if (canvasFloating.value && excalidrawJson) {
      const canvas = await drawCanvas(excalidrawJson, canvasFloating.value.clientWidth, canvasFloating.value.clientHeight)

      if (canvas) {
        canvasFloating.value.appendChild(canvas)
      }
    }
  });
}

function closeFullView() {
  showFullView.value = false;
}

// 可选：窗口大小变化时自适应
// window.addEventListener("resize", resizeCanvas);

const getExcalidraw = async (path: string): Promise<ExportedDataState | undefined> => {
  const res = await fetch(withBase(path)).catch((err) => {
    console.log("excalidraw file err: ", err)
  })
  if (!res) return undefined

  const json = await res.json()
  return json
}

const drawCanvas = async (data: ExportedDataState, width: number, height: number): Promise<HTMLCanvasElement> => {
  // const maxWidthOrHeight = width > height ? height : width
  // 改为只限制宽度，因为渲染前父窗口高度可能为0，导致maxWidthOrHeight不生效
  const maxWidthOrHeight = width
  const canvas = await exportToCanvas({
    ...data,
    maxWidthOrHeight,// 绘制的最大高度或宽度，设置maxWidthOrHeight后getDimensions则不生效
    // getDimensions: (width: number, height: number) => {
    //   return {
    //     width,
    //     height,
    //     scale: 1
    //   }
    // }, // 参数为原始绘制尺寸，返回尺寸和比例 {width: number; height: number; scale: number}
    exportPadding: 10 // 添加边距，默认10
  })
  return canvas
}

onMounted(async () => {
  console.log("excalidrawJson: ", props.filePath)
  excalidrawJson = await getExcalidraw(props.filePath)
  if (excalidrawJson && canvasContainer.value) {
    let excalidrawCanvas = await drawCanvas(excalidrawJson, canvasContainer.value.clientWidth, canvasContainer.value.clientHeight)

    if (excalidrawCanvas) {
      canvasContainer.value.appendChild(excalidrawCanvas)
    }

    // 使用 ResizeObserver 监听父容器宽度变化
    const resizeObserver = new ResizeObserver(async (entries: ResizeObserverEntry[]) => {
      for (const entry of entries) {
        const el = entry.target
        if (el === canvasContainer.value && excalidrawJson) {
          excalidrawCanvas = await drawCanvas(excalidrawJson, el.clientWidth, el.clientHeight)
        }
      }
    });
    resizeObserver.observe(canvasContainer.value!);
  }
})
</script>

<style scoped>
.excalidraw-wrapper {
  width: 100%;
  border: 1px solid #ddd;
}
.floating-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.8);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
}
.floating-canvas canvas {
  max-width: 90vw;
  max-height: 90vh;
  box-shadow: 0 0 12px #fff;
}
</style>