feat: Add PDF viewer and preview components with styling and functionality
- Implemented DeesPdfViewer for full-featured PDF viewing with toolbar and sidebar navigation. - Created DeesPdfPreview for lightweight PDF previews. - Introduced PdfManager for managing PDF document loading and caching. - Added CanvasPool for efficient canvas management. - Developed utility functions for performance monitoring and file size formatting. - Established styles for viewer and preview components to enhance UI/UX. - Included demo examples for showcasing PDF viewer capabilities.
This commit is contained in:
290
ts_web/elements/dees-pdf-preview/component.ts
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290
ts_web/elements/dees-pdf-preview/component.ts
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import { DeesElement, property, html, customElement, domtools, type TemplateResult, css, cssManager } 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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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 maxPages: number = 3;
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@property({ type: Number })
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public stackOffset: number = 8;
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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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private observer: IntersectionObserver;
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private pdfDocument: any;
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private canvases: PooledCanvas[] = [];
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private renderRequestId: number;
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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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>
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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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${!this.loading && !this.error ? html`
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<div class="preview-stack">
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${this.getStackedCanvases()}
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</div>
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${this.pageCount > 0 ? html`
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<div class="preview-info">
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<dees-icon icon="lucide:FileText"></dees-icon>
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<span class="preview-pages">${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 getStackedCanvases(): TemplateResult[] {
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const pagesToShow = Math.min(this.pageCount, this.maxPages);
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const canvases: TemplateResult[] = [];
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for (let i = pagesToShow - 1; i >= 0; i--) {
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const offset = i * this.stackOffset;
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canvases.push(html`
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<canvas
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class="preview-canvas"
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data-page="${i + 1}"
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style="
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top: ${offset}px;
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left: ${offset}px;
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z-index: ${pagesToShow - i};
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${i > 0 ? `box-shadow: 0 2px 8px rgba(0, 0, 0, ${0.1 + (i * 0.05)});` : ''}
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"
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></canvas>
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`);
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}
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return canvases;
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}
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public async connectedCallback() {
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super.connectedCallback();
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this.setupIntersectionObserver();
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}
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public async disconnectedCallback() {
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super.disconnectedCallback();
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this.cleanup();
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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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await this.updateComplete;
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await this.renderPages();
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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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} finally {
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this.loading = false;
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}
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}
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private async renderPages() {
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const canvasElements = this.shadowRoot?.querySelectorAll('.preview-canvas') as NodeListOf<HTMLCanvasElement>;
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const pagesToRender = Math.min(this.pageCount, this.maxPages);
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// Release old canvases
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this.clearCanvases();
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// Calculate available width for preview (container width minus padding and stacking offset)
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const containerWidth = 160; // 200px container - 40px padding
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const maxStackOffset = (pagesToRender - 1) * this.stackOffset;
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const availableWidth = containerWidth - maxStackOffset;
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// Render pages in reverse order (back to front for stacking)
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for (let i = 0; i < pagesToRender; i++) {
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const canvas = canvasElements[i];
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if (!canvas) continue;
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const pageNum = parseInt(canvas.dataset.page || '1');
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const page = await this.pdfDocument.getPage(pageNum);
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// Calculate scale to fit within available width
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const initialViewport = page.getViewport({ scale: 1 });
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const scale = Math.min(availableWidth / initialViewport.width, 0.5); // Cap at 0.5 for quality
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const viewport = page.getViewport({ scale });
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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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canvas.width = viewport.width;
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canvas.height = viewport.height;
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canvas.style.width = `${viewport.width}px`;
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canvas.style.height = `${viewport.height}px`;
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const ctx = canvas.getContext('2d');
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if (ctx) {
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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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}
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}
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private clearCanvases() {
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// Cancel any pending render
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if (this.renderRequestId) {
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cancelAnimationFrame(this.renderRequestId);
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this.renderRequestId = 0;
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}
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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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if (this.observer) {
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this.observer.disconnect();
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}
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this.clearCanvases();
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if (this.pdfUrl && this.pdfDocument) {
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PdfManager.releaseDocument(this.pdfUrl);
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this.pdfDocument = null;
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}
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this.rendered = 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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this.cleanup();
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this.rendered = false;
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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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}
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}
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189
ts_web/elements/dees-pdf-preview/demo.ts
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189
ts_web/elements/dees-pdf-preview/demo.ts
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import { html } from '@design.estate/dees-element';
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export const demo = () => {
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const samplePdfs = [
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'https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/examples/learning/helloworld.pdf',
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'https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/web/compressed.tracemonkey-pldi-09.pdf',
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];
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const generateGridItems = (count: number) => {
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const items = [];
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for (let i = 0; i < count; i++) {
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const pdfUrl = samplePdfs[i % samplePdfs.length];
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items.push(html`
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<dees-pdf-preview
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pdfUrl="${pdfUrl}"
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maxPages="3"
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stackOffset="6"
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clickable="true"
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grid-mode
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@pdf-preview-click=${(e: CustomEvent) => {
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console.log('PDF Preview clicked:', e.detail);
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alert(`PDF clicked: ${e.detail.pageCount} pages`);
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}}
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></dees-pdf-preview>
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`);
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}
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return items;
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};
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return html`
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<style>
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.demo-container {
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padding: 40px;
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background: #f5f5f5;
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}
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.demo-section {
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margin-bottom: 60px;
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}
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h3 {
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margin-bottom: 20px;
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font-size: 18px;
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font-weight: 600;
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}
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.preview-grid {
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display: grid;
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grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
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gap: 24px;
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}
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.preview-row {
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display: flex;
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gap: 24px;
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align-items: center;
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margin-bottom: 20px;
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}
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.preview-label {
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font-size: 14px;
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font-weight: 500;
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min-width: 100px;
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}
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.performance-stats {
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margin-top: 20px;
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padding: 16px;
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background: white;
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border-radius: 8px;
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font-size: 14px;
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}
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.stats-grid {
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display: grid;
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grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
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gap: 12px;
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margin-top: 12px;
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}
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.stat-item {
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display: flex;
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flex-direction: column;
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gap: 4px;
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}
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.stat-label {
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font-size: 12px;
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color: #666;
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}
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.stat-value {
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font-size: 16px;
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font-weight: 600;
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}
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</style>
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<div class="demo-container">
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<div class="demo-section">
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<h3>Single PDF Preview with Stacked Pages</h3>
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<dees-pdf-preview
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pdfUrl="https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/web/compressed.tracemonkey-pldi-09.pdf"
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maxPages="3"
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stackOffset="8"
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clickable="true"
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></dees-pdf-preview>
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</div>
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<div class="demo-section">
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<h3>Different Sizes</h3>
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<div class="preview-row">
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<div class="preview-label">Small:</div>
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<dees-pdf-preview
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size="small"
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pdfUrl="https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/examples/learning/helloworld.pdf"
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maxPages="2"
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stackOffset="6"
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clickable="true"
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></dees-pdf-preview>
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</div>
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<div class="preview-row">
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<div class="preview-label">Default:</div>
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<dees-pdf-preview
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pdfUrl="https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/examples/learning/helloworld.pdf"
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maxPages="3"
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stackOffset="8"
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clickable="true"
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></dees-pdf-preview>
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</div>
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<div class="preview-row">
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<div class="preview-label">Large:</div>
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<dees-pdf-preview
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size="large"
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pdfUrl="https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/examples/learning/helloworld.pdf"
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maxPages="4"
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stackOffset="10"
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clickable="true"
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></dees-pdf-preview>
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</div>
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</div>
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<div class="demo-section">
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<h3>Non-Clickable Preview</h3>
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<dees-pdf-preview
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pdfUrl="https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/examples/learning/helloworld.pdf"
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maxPages="3"
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stackOffset="8"
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clickable="false"
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></dees-pdf-preview>
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</div>
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<div class="demo-section">
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<h3>Performance Grid - 50 PDFs with Lazy Loading</h3>
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<p style="margin-bottom: 20px; font-size: 14px; color: #666;">
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This grid demonstrates the performance optimizations with 50 PDF previews.
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Scroll to see lazy loading in action - previews render only when visible.
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</p>
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<div class="preview-grid">
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${generateGridItems(50)}
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</div>
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<div class="performance-stats">
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<h4>Performance Features</h4>
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<div class="stats-grid">
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<div class="stat-item">
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<span class="stat-label">Lazy Loading</span>
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<span class="stat-value">✓ Enabled</span>
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</div>
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<div class="stat-item">
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<span class="stat-label">Canvas Pooling</span>
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<span class="stat-value">✓ Active</span>
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</div>
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<div class="stat-item">
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<span class="stat-label">Memory Management</span>
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<span class="stat-value">✓ Optimized</span>
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</div>
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<div class="stat-item">
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<span class="stat-label">Intersection Observer</span>
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<span class="stat-value">200px margin</span>
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</div>
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</div>
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</div>
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</div>
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</div>
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`;
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};
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1
ts_web/elements/dees-pdf-preview/index.ts
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1
ts_web/elements/dees-pdf-preview/index.ts
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@@ -0,0 +1 @@
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export * from './component.js';
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177
ts_web/elements/dees-pdf-preview/styles.ts
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177
ts_web/elements/dees-pdf-preview/styles.ts
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@@ -0,0 +1,177 @@
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import { css, cssManager } from '@design.estate/dees-element';
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export const previewStyles = [
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cssManager.defaultStyles,
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css`
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:host {
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display: inline-block;
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position: relative;
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}
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.preview-container {
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position: relative;
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width: 200px;
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height: 260px;
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background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(215 20% 16%)')};
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border: 1px solid ${cssManager.bdTheme('hsl(214 31% 91%)', 'hsl(217 25% 26%)')};
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border-radius: 12px;
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overflow: hidden;
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||||
transition: transform 0.2s ease, box-shadow 0.2s ease;
|
||||
}
|
||||
|
||||
.preview-container.clickable {
|
||||
cursor: pointer;
|
||||
}
|
||||
|
||||
.preview-container.clickable:hover {
|
||||
transform: translateY(-2px);
|
||||
box-shadow: 0 8px 24px ${cssManager.bdTheme('rgba(0, 0, 0, 0.12)', 'rgba(0, 0, 0, 0.3)')};
|
||||
}
|
||||
|
||||
.preview-container.clickable:hover .preview-overlay {
|
||||
opacity: 1;
|
||||
}
|
||||
|
||||
.preview-stack {
|
||||
position: relative;
|
||||
width: 100%;
|
||||
height: 100%;
|
||||
padding: 20px;
|
||||
box-sizing: border-box;
|
||||
}
|
||||
|
||||
.preview-canvas {
|
||||
position: absolute;
|
||||
background: white;
|
||||
border: 1px solid ${cssManager.bdTheme('hsl(214 31% 88%)', 'hsl(217 25% 30%)')};
|
||||
border-radius: 4px;
|
||||
display: block;
|
||||
image-rendering: -webkit-optimize-contrast;
|
||||
image-rendering: crisp-edges;
|
||||
}
|
||||
|
||||
.preview-info {
|
||||
position: absolute;
|
||||
bottom: 12px;
|
||||
left: 12px;
|
||||
right: 12px;
|
||||
padding: 8px 12px;
|
||||
background: ${cssManager.bdTheme('hsl(0 0% 100% / 0.95)', 'hsl(215 20% 12% / 0.95)')};
|
||||
border: 1px solid ${cssManager.bdTheme('hsl(214 31% 91%)', 'hsl(217 25% 26%)')};
|
||||
border-radius: 8px;
|
||||
display: flex;
|
||||
align-items: center;
|
||||
gap: 8px;
|
||||
font-size: 13px;
|
||||
color: ${cssManager.bdTheme('hsl(215 16% 45%)', 'hsl(215 16% 75%)')};
|
||||
backdrop-filter: blur(8px);
|
||||
z-index: 10;
|
||||
}
|
||||
|
||||
.preview-info dees-icon {
|
||||
font-size: 14px;
|
||||
color: ${cssManager.bdTheme('hsl(217 91% 60%)', 'hsl(213 93% 68%)')};
|
||||
}
|
||||
|
||||
.preview-pages {
|
||||
font-weight: 500;
|
||||
}
|
||||
|
||||
.preview-overlay {
|
||||
position: absolute;
|
||||
top: 0;
|
||||
left: 0;
|
||||
right: 0;
|
||||
bottom: 0;
|
||||
background: ${cssManager.bdTheme('rgba(0, 0, 0, 0.7)', 'rgba(0, 0, 0, 0.8)')};
|
||||
display: flex;
|
||||
flex-direction: column;
|
||||
align-items: center;
|
||||
justify-content: center;
|
||||
gap: 8px;
|
||||
opacity: 0;
|
||||
transition: opacity 0.2s ease;
|
||||
z-index: 20;
|
||||
}
|
||||
|
||||
.preview-overlay dees-icon {
|
||||
font-size: 24px;
|
||||
color: white;
|
||||
}
|
||||
|
||||
.preview-overlay span {
|
||||
font-size: 14px;
|
||||
font-weight: 500;
|
||||
color: white;
|
||||
}
|
||||
|
||||
.preview-loading,
|
||||
.preview-error {
|
||||
position: absolute;
|
||||
top: 0;
|
||||
left: 0;
|
||||
right: 0;
|
||||
bottom: 0;
|
||||
display: flex;
|
||||
flex-direction: column;
|
||||
align-items: center;
|
||||
justify-content: center;
|
||||
gap: 12px;
|
||||
color: ${cssManager.bdTheme('hsl(215 16% 45%)', 'hsl(215 16% 75%)')};
|
||||
}
|
||||
|
||||
.preview-loading {
|
||||
background: ${cssManager.bdTheme('hsl(0 0% 99%)', 'hsl(215 20% 14%)')};
|
||||
}
|
||||
|
||||
.preview-error {
|
||||
background: ${cssManager.bdTheme('hsl(0 72% 98%)', 'hsl(0 62% 20%)')};
|
||||
color: ${cssManager.bdTheme('hsl(0 72% 40%)', 'hsl(0 70% 68%)')};
|
||||
}
|
||||
|
||||
.preview-spinner {
|
||||
width: 24px;
|
||||
height: 24px;
|
||||
border-radius: 50%;
|
||||
border: 2px solid ${cssManager.bdTheme('hsl(214 31% 86%)', 'hsl(217 25% 28%)')};
|
||||
border-top-color: ${cssManager.bdTheme('hsl(217 91% 60%)', 'hsl(213 93% 68%)')};
|
||||
animation: spin 0.8s linear infinite;
|
||||
}
|
||||
|
||||
@keyframes spin {
|
||||
to {
|
||||
transform: rotate(360deg);
|
||||
}
|
||||
}
|
||||
|
||||
.preview-text {
|
||||
font-size: 13px;
|
||||
font-weight: 500;
|
||||
}
|
||||
|
||||
.preview-error dees-icon {
|
||||
font-size: 32px;
|
||||
}
|
||||
|
||||
/* Responsive sizes */
|
||||
:host([size="small"]) .preview-container {
|
||||
width: 150px;
|
||||
height: 195px;
|
||||
}
|
||||
|
||||
:host([size="large"]) .preview-container {
|
||||
width: 250px;
|
||||
height: 325px;
|
||||
}
|
||||
|
||||
/* Grid optimizations */
|
||||
:host([grid-mode]) .preview-container {
|
||||
will-change: auto;
|
||||
}
|
||||
|
||||
:host([grid-mode]) .preview-canvas {
|
||||
image-rendering: -webkit-optimize-contrast;
|
||||
image-rendering: crisp-edges;
|
||||
}
|
||||
`,
|
||||
];
|
||||
Reference in New Issue
Block a user