fix
This commit is contained in:
@@ -0,0 +1,264 @@
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<script setup lang="ts">
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import { invoke } from "@tauri-apps/api/core";
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import {
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GlobalWorkerOptions,
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getDocument,
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type PDFDocumentLoadingTask,
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type PDFDocumentProxy,
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type RenderTask,
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} from "pdfjs-dist";
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import { computed, nextTick, onBeforeUnmount, ref, watch } from "vue";
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const props = defineProps<{
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localPath: string;
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scanUrl: string;
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title: string;
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}>();
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const show = defineModel<boolean>("show", { required: true });
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GlobalWorkerOptions.workerSrc = new URL(
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"pdfjs-dist/build/pdf.worker.min.mjs",
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import.meta.url,
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).toString();
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const canvasRef = ref<HTMLCanvasElement | null>(null);
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const pdfDocument = ref<PDFDocumentProxy | null>(null);
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const loading = ref(false);
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const error = ref("");
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const pageNumber = ref(1);
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const pageCount = ref(0);
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const scale = ref(1.1);
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let loadingTask: PDFDocumentLoadingTask | null = null;
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let renderTask: RenderTask | null = null;
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const pageInfo = computed(() => `${pageNumber.value} / ${pageCount.value}`);
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const canGoBack = computed(() => pageNumber.value > 1);
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const canGoForward = computed(() => pageNumber.value < pageCount.value);
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async function loadDocument() {
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resetDocument();
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loading.value = true;
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error.value = "";
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let task: PDFDocumentLoadingTask | null = null;
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try {
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const bytes = await invoke<number[]>("load_application_file", {
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localPath: props.localPath,
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scanUrl: props.scanUrl,
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});
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if (!bytes.length) {
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throw new Error("Файл пустой");
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}
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task = getDocument({ data: new Uint8Array(bytes) });
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loadingTask = task;
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const document = await task.promise;
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if (loadingTask !== task) {
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await document.destroy();
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return;
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}
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pdfDocument.value = document;
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pageCount.value = document.numPages;
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pageNumber.value = 1;
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scale.value = 1.1;
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await renderPage();
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} catch (err) {
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error.value = err instanceof Error ? err.message : "Не удалось открыть PDF";
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} finally {
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loading.value = false;
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if (task && loadingTask === task) {
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loadingTask = null;
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}
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}
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}
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async function renderPage() {
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const document = pdfDocument.value;
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const canvas = canvasRef.value;
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if (!document || !canvas) {
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return;
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}
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renderTask?.cancel();
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const page = await document.getPage(pageNumber.value);
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const viewport = page.getViewport({ scale: scale.value });
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const context = canvas.getContext("2d");
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if (!context) {
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error.value = "Не удалось создать canvas context";
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return;
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}
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const devicePixelRatio = window.devicePixelRatio || 1;
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canvas.width = Math.floor(viewport.width * devicePixelRatio);
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canvas.height = Math.floor(viewport.height * devicePixelRatio);
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canvas.style.width = `${viewport.width}px`;
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canvas.style.height = `${viewport.height}px`;
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context.setTransform(devicePixelRatio, 0, 0, devicePixelRatio, 0, 0);
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renderTask = page.render({ canvas: canvas, canvasContext: context, viewport });
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try {
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await renderTask.promise;
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} catch (err) {
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if (!(err instanceof Error) || err.name !== "RenderingCancelledException") {
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error.value = err instanceof Error ? err.message : "Не удалось отрисовать PDF";
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}
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}
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}
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function resetDocument() {
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renderTask?.cancel();
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renderTask = null;
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loadingTask?.destroy().catch(() => undefined);
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loadingTask = null;
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pdfDocument.value?.destroy().catch(() => undefined);
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pdfDocument.value = null;
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pageCount.value = 0;
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pageNumber.value = 1;
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loading.value = false;
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error.value = "";
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}
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async function goBack() {
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if (canGoBack.value) {
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pageNumber.value -= 1;
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await nextTick();
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await renderPage();
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}
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}
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async function goForward() {
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if (canGoForward.value) {
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pageNumber.value += 1;
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await nextTick();
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await renderPage();
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}
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}
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async function zoomIn() {
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scale.value = Math.min(scale.value + 0.2, 3);
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await nextTick();
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await renderPage();
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}
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async function zoomOut() {
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scale.value = Math.max(scale.value - 0.2, 0.5);
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await nextTick();
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await renderPage();
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}
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watch([show, () => props.localPath, () => props.scanUrl], async ([visible]) => {
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if (visible) {
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await nextTick();
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await loadDocument();
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} else {
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resetDocument();
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}
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});
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onBeforeUnmount(() => {
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resetDocument();
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});
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</script>
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<template>
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<van-popup v-model:show="show" round position="bottom" class="pdf-preview">
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<div class="pdf-preview__header">
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<div class="pdf-preview__title">{{ title }}</div>
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<van-button size="small" plain @click="show = false">Закрыть</van-button>
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</div>
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<div class="pdf-preview__toolbar">
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<van-button size="small" plain :disabled="!canGoBack" @click="goBack">
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Назад
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</van-button>
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<div class="pdf-preview__page-info">{{ pageInfo }}</div>
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<van-button size="small" plain :disabled="!canGoForward" @click="goForward">
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Вперед
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</van-button>
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<van-button size="small" plain @click="zoomOut">-</van-button>
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<van-button size="small" plain @click="zoomIn">+</van-button>
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</div>
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<div class="pdf-preview__body">
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<van-loading v-if="loading">Загрузка PDF...</van-loading>
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<van-empty v-else-if="error" :description="error" />
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<div v-else class="pdf-preview__canvas-wrap">
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<canvas ref="canvasRef" class="pdf-preview__canvas" />
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</div>
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</div>
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</van-popup>
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</template>
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<style scoped>
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.pdf-preview {
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display: flex;
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flex-direction: column;
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height: 92vh;
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background: #f5f7fb;
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}
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.pdf-preview__header,
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.pdf-preview__toolbar {
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display: flex;
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align-items: center;
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gap: 8px;
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padding: 12px 16px;
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background: #fff;
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}
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.pdf-preview__header {
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justify-content: space-between;
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border-bottom: 1px solid #eef0f4;
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}
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.pdf-preview__title {
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min-width: 0;
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font-size: 16px;
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font-weight: 600;
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overflow: hidden;
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text-overflow: ellipsis;
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white-space: nowrap;
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}
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.pdf-preview__toolbar {
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justify-content: center;
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flex-wrap: wrap;
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border-bottom: 1px solid #eef0f4;
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}
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.pdf-preview__page-info {
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min-width: 72px;
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text-align: center;
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color: #636b74;
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font-size: 13px;
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}
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.pdf-preview__body {
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flex: 1;
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min-height: 0;
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overflow: auto;
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padding: 16px;
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}
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.pdf-preview__canvas-wrap {
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display: flex;
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justify-content: center;
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}
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.pdf-preview__canvas {
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max-width: 100%;
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height: auto;
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background: #fff;
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box-shadow: 0 8px 28px rgba(15, 23, 42, 0.16);
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}
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</style>
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