538 lines
16 KiB
TypeScript
538 lines
16 KiB
TypeScript
import { DeesElement, property, html, customElement, type TemplateResult } from '@design.estate/dees-element';
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import { PdfManager } from '../dees-pdf-shared/PdfManager.js';
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import { CanvasPool, type PooledCanvas } from '../dees-pdf-shared/CanvasPool.js';
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import { PerformanceMonitor, throttle } from '../dees-pdf-shared/utils.js';
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import { previewStyles } from './styles.js';
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import { demo as demoFunc } from './demo.js';
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import '../dees-icon.js';
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declare global {
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interface HTMLElementTagNameMap {
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'dees-pdf-preview': DeesPdfPreview;
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}
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}
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@customElement('dees-pdf-preview')
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export class DeesPdfPreview extends DeesElement {
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public static demo = demoFunc;
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public static styles = previewStyles;
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@property({ type: String })
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public pdfUrl: string = '';
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@property({ type: Number })
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public currentPreviewPage: number = 1;
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@property({ type: Boolean })
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public clickable: boolean = true;
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@property({ type: Number })
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private pageCount: number = 0;
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@property({ type: Boolean })
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private loading: boolean = false;
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@property({ type: Boolean })
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private rendered: boolean = false;
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@property({ type: Boolean })
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private error: boolean = false;
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@property({ type: Boolean })
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private isHovering: boolean = false;
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@property({ type: Boolean })
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private isA4Format: boolean = true;
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private renderPagesTask: Promise<void> | null = null;
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private renderPagesQueued: boolean = false;
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private observer: IntersectionObserver;
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private pdfDocument: any;
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private canvases: PooledCanvas[] = [];
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private resizeObserver?: ResizeObserver;
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private previewContainer: HTMLElement | null = null;
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private stackElement: HTMLElement | null = null;
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private loadedPdfUrl: string | null = null;
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constructor() {
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super();
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}
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public render(): TemplateResult {
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return html`
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<div
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class="preview-container ${this.loading ? 'loading' : ''} ${this.error ? 'error' : ''} ${this.clickable ? 'clickable' : ''}"
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@click=${this.handleClick}
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@mouseenter=${this.handleMouseEnter}
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@mouseleave=${this.handleMouseLeave}
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@mousemove=${this.handleMouseMove}
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>
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${this.loading ? html`
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<div class="preview-loading">
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<div class="preview-spinner"></div>
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<div class="preview-text">Loading preview...</div>
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</div>
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` : ''}
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${this.error ? html`
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<div class="preview-error">
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<dees-icon icon="lucide:FileX"></dees-icon>
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<div class="preview-text">Failed to load PDF</div>
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</div>
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` : ''}
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${!this.loading && !this.error ? html`
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<div class="preview-stack ${!this.isA4Format ? 'non-a4' : ''}">
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<canvas
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class="preview-canvas"
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data-page="${this.currentPreviewPage}"
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></canvas>
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</div>
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${this.pageCount > 1 && this.isHovering ? html`
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<div class="preview-page-indicator">
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Page ${this.currentPreviewPage} of ${this.pageCount}
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</div>
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` : ''}
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${this.pageCount > 0 && !this.isHovering ? html`
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<div class="preview-info">
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<dees-icon icon="lucide:FileText"></dees-icon>
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<span class="preview-pages">${this.pageCount} page${this.pageCount > 1 ? 's' : ''}</span>
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</div>
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` : ''}
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${this.clickable ? html`
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<div class="preview-overlay">
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<dees-icon icon="lucide:Eye"></dees-icon>
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<span>View PDF</span>
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</div>
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` : ''}
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` : ''}
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</div>
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`;
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}
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private handleMouseEnter() {
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this.isHovering = true;
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}
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private handleMouseLeave() {
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this.isHovering = false;
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// Reset to first page when not hovering
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if (this.currentPreviewPage !== 1) {
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this.currentPreviewPage = 1;
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void this.scheduleRenderPages();
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}
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}
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private handleMouseMove(e: MouseEvent) {
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if (!this.isHovering || this.pageCount <= 1) return;
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const rect = this.getBoundingClientRect();
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const x = e.clientX - rect.left;
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const width = rect.width;
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// Calculate which page to show based on horizontal position
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const percentage = Math.max(0, Math.min(1, x / width));
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const newPage = Math.ceil(percentage * this.pageCount) || 1;
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if (newPage !== this.currentPreviewPage) {
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this.currentPreviewPage = newPage;
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void this.scheduleRenderPages();
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}
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}
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public async connectedCallback() {
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await super.connectedCallback();
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this.setupIntersectionObserver();
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await this.updateComplete;
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this.cacheElements();
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this.setupResizeObserver();
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}
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public async disconnectedCallback() {
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await super.disconnectedCallback();
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this.cleanup();
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if (this.observer) {
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this.observer.disconnect();
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}
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this.resizeObserver?.disconnect();
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this.resizeObserver = undefined;
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}
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private setupIntersectionObserver() {
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const options = {
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root: null,
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rootMargin: '200px',
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threshold: 0.01,
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};
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this.observer = new IntersectionObserver(
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throttle((entries) => {
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for (const entry of entries) {
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if (entry.isIntersecting && !this.rendered && this.pdfUrl) {
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this.loadAndRenderPreview();
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} else if (!entry.isIntersecting && this.rendered) {
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// Optional: Clear canvases when out of view for memory optimization
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// this.clearCanvases();
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}
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}
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}, 100),
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options
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);
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this.observer.observe(this);
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}
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private async loadAndRenderPreview() {
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if (this.rendered || this.loading) return;
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this.loading = true;
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this.error = false;
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PerformanceMonitor.mark(`preview-load-${this.pdfUrl}`);
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try {
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this.pdfDocument = await PdfManager.loadDocument(this.pdfUrl);
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this.pageCount = this.pdfDocument.numPages;
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this.currentPreviewPage = 1;
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this.loadedPdfUrl = this.pdfUrl;
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// Force an update to ensure the canvas element is in the DOM
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this.loading = false;
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await this.updateComplete;
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this.cacheElements();
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// Now render the first page
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await this.scheduleRenderPages();
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this.rendered = true;
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const duration = PerformanceMonitor.measure(`preview-render-${this.pdfUrl}`, `preview-load-${this.pdfUrl}`);
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console.log(`PDF preview rendered in ${duration}ms`);
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} catch (error) {
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console.error('Failed to load PDF preview:', error);
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this.error = true;
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this.loading = false;
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}
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}
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private scheduleRenderPages(): Promise<void> {
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if (!this.pdfDocument) {
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return Promise.resolve();
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}
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if (this.renderPagesTask) {
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this.renderPagesQueued = true;
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return this.renderPagesTask;
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}
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this.renderPagesTask = (async () => {
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try {
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await this.performRenderPages();
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} catch (error) {
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console.error('Failed to render PDF preview pages:', error);
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}
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})().finally(() => {
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this.renderPagesTask = null;
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if (this.renderPagesQueued) {
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this.renderPagesQueued = false;
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void this.scheduleRenderPages();
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}
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});
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return this.renderPagesTask;
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}
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private async performRenderPages() {
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if (!this.pdfDocument) return;
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// Wait a frame to ensure DOM is ready
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await new Promise(resolve => requestAnimationFrame(resolve));
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const canvas = this.shadowRoot?.querySelector('.preview-canvas') as HTMLCanvasElement;
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if (!canvas) {
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console.warn('Preview canvas not found in DOM');
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return;
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}
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// Release old canvases
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this.clearCanvases();
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this.cacheElements();
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// Get available size for the preview
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const { availableWidth, availableHeight } = this.getAvailableSize();
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try {
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// Get the page to render
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const pageNum = this.currentPreviewPage;
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const page = await this.pdfDocument.getPage(pageNum);
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// Calculate scale to fit within available area while keeping aspect ratio
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// Use higher scale for sharper rendering
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const initialViewport = page.getViewport({ scale: 1 });
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// Check if this is standard paper format (A4 or US Letter)
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const aspectRatio = initialViewport.height / initialViewport.width;
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// Common paper format ratios
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const a4PortraitRatio = 1.414; // 297mm / 210mm
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const a4LandscapeRatio = 0.707; // 210mm / 297mm
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const letterPortraitRatio = 1.294; // 11" / 8.5"
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const letterLandscapeRatio = 0.773; // 8.5" / 11"
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// Check for standard formats with 5% tolerance
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const tolerance = 0.05;
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const isA4Portrait = Math.abs(aspectRatio - a4PortraitRatio) < (a4PortraitRatio * tolerance);
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const isA4Landscape = Math.abs(aspectRatio - a4LandscapeRatio) < (a4LandscapeRatio * tolerance);
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const isLetterPortrait = Math.abs(aspectRatio - letterPortraitRatio) < (letterPortraitRatio * tolerance);
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const isLetterLandscape = Math.abs(aspectRatio - letterLandscapeRatio) < (letterLandscapeRatio * tolerance);
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// Consider it standard format if it matches A4 or US Letter
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this.isA4Format = isA4Portrait || isA4Landscape || isLetterPortrait || isLetterLandscape;
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// Debug logging
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console.log(`PDF aspect ratio: ${aspectRatio.toFixed(3)}, standard format: ${this.isA4Format}`)
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// Adjust available size for non-A4 documents (account for padding)
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const adjustedWidth = this.isA4Format ? availableWidth : availableWidth - 24;
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const adjustedHeight = this.isA4Format ? availableHeight : availableHeight - 24;
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const scaleX = adjustedWidth > 0 ? adjustedWidth / initialViewport.width : 0;
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const scaleY = adjustedHeight > 0 ? adjustedHeight / initialViewport.height : 0;
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// Increase scale by 2x for sharper rendering, but limit to 3.0 max
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const baseScale = Math.min(scaleX || 0.5, scaleY || scaleX || 0.5);
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const renderScale = Math.min(baseScale * 2, 3.0);
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if (!Number.isFinite(renderScale) || renderScale <= 0) {
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page.cleanup?.();
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return;
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}
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const viewport = page.getViewport({ scale: renderScale });
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// Acquire canvas from pool
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const pooledCanvas = CanvasPool.acquire(viewport.width, viewport.height);
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this.canvases.push(pooledCanvas);
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// Render to pooled canvas first
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const renderContext = {
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canvasContext: pooledCanvas.ctx,
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viewport: viewport,
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};
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await page.render(renderContext).promise;
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// Transfer to display canvas
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// Set actual canvas resolution for sharpness
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canvas.width = viewport.width;
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canvas.height = viewport.height;
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// Scale down display size to fit the container while keeping high resolution
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// For A4, fill the container; for non-A4, respect padding
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const displayWidth = adjustedWidth;
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const displayHeight = (viewport.height / viewport.width) * adjustedWidth;
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// If it fits height-wise better, scale by height instead
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if (displayHeight > adjustedHeight) {
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const altDisplayHeight = adjustedHeight;
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const altDisplayWidth = (viewport.width / viewport.height) * adjustedHeight;
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canvas.style.width = `${altDisplayWidth}px`;
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canvas.style.height = `${altDisplayHeight}px`;
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} else {
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canvas.style.width = `${displayWidth}px`;
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canvas.style.height = `${displayHeight}px`;
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}
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const ctx = canvas.getContext('2d');
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if (ctx) {
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// Enable image smoothing for better quality
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ctx.imageSmoothingEnabled = true;
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ctx.imageSmoothingQuality = 'high';
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ctx.drawImage(pooledCanvas.canvas, 0, 0);
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}
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// Release page to free memory
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page.cleanup();
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} catch (error) {
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console.error(`Failed to render page ${this.currentPreviewPage}:`, error);
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}
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}
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private clearCanvases() {
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// Release pooled canvases
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for (const pooledCanvas of this.canvases) {
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CanvasPool.release(pooledCanvas);
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}
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this.canvases = [];
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}
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private cleanup() {
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this.clearCanvases();
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if (this.pdfDocument) {
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PdfManager.releaseDocument(this.loadedPdfUrl ?? this.pdfUrl);
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this.pdfDocument = null;
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}
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this.renderPagesQueued = false;
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this.pageCount = 0;
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this.currentPreviewPage = 1;
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this.isHovering = false;
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this.isA4Format = true;
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this.previewContainer = null;
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this.stackElement = null;
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this.loadedPdfUrl = null;
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this.rendered = false;
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this.loading = false;
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this.error = false;
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}
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private handleClick() {
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if (!this.clickable) return;
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// Dispatch custom event for parent to handle
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this.dispatchEvent(new CustomEvent('pdf-preview-click', {
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detail: {
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pdfUrl: this.pdfUrl,
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pageCount: this.pageCount,
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},
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bubbles: true,
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composed: true,
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}));
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}
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public async updated(changedProperties: Map<PropertyKey, unknown>) {
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super.updated(changedProperties);
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if (changedProperties.has('pdfUrl') && this.pdfUrl) {
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const previousUrl = changedProperties.get('pdfUrl') as string | undefined;
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if (previousUrl) {
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PdfManager.releaseDocument(previousUrl);
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}
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this.cleanup();
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this.rendered = false;
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this.currentPreviewPage = 1;
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// Check if in viewport and render if so
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if (this.observer) {
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const rect = this.getBoundingClientRect();
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if (rect.top < window.innerHeight && rect.bottom > 0) {
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this.loadAndRenderPreview();
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}
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}
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}
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if (changedProperties.has('currentPreviewPage') && this.rendered) {
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await this.scheduleRenderPages();
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}
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}
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/**
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* Provide context menu items for right-click functionality
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*/
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public getContextMenuItems() {
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const items: any[] = [];
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// If clickable, add option to view the PDF
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if (this.clickable) {
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items.push({
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name: 'View PDF',
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iconName: 'lucide:Eye',
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action: async () => {
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this.handleClick();
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}
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});
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items.push({ divider: true });
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}
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items.push(
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{
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name: 'Open PDF in New Tab',
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iconName: 'lucide:ExternalLink',
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action: async () => {
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window.open(this.pdfUrl, '_blank');
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}
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},
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{ divider: true },
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{
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name: 'Copy PDF URL',
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iconName: 'lucide:Copy',
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action: async () => {
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await navigator.clipboard.writeText(this.pdfUrl);
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}
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},
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{
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name: 'Download PDF',
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iconName: 'lucide:Download',
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action: async () => {
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const link = document.createElement('a');
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link.href = this.pdfUrl;
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link.download = this.pdfUrl.split('/').pop() || 'document.pdf';
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link.click();
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}
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}
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);
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// Add page count info as a disabled item
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if (this.pageCount > 0) {
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items.push(
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{ divider: true },
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{
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name: `${this.pageCount} page${this.pageCount > 1 ? 's' : ''}`,
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iconName: 'lucide:FileText',
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disabled: true,
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action: async () => {}
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}
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);
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}
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return items;
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}
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private cacheElements() {
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if (!this.previewContainer) {
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this.previewContainer = this.shadowRoot?.querySelector('.preview-container') as HTMLElement;
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}
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if (!this.stackElement) {
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this.stackElement = this.shadowRoot?.querySelector('.preview-stack') as HTMLElement;
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}
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}
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private setupResizeObserver() {
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if (!this.previewContainer || this.resizeObserver) return;
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this.resizeObserver = new ResizeObserver(() => {
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if (this.rendered && this.pdfDocument && !this.loading) {
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void this.scheduleRenderPages();
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}
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});
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this.resizeObserver.observe(this);
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}
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private getAvailableSize() {
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if (!this.stackElement) {
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// Try to get the stack element if it's not cached
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this.stackElement = this.shadowRoot?.querySelector('.preview-stack') as HTMLElement;
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}
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if (!this.stackElement) {
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// Fallback to default size if element not found
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return {
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availableWidth: 200, // Full container width
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availableHeight: 260, // Full container height
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};
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}
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const rect = this.stackElement.getBoundingClientRect();
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const availableWidth = Math.max(rect.width, 0) || 200;
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const availableHeight = Math.max(rect.height, 0) || 260;
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return { availableWidth, availableHeight };
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}
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}
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