425 lines
12 KiB
TypeScript
425 lines
12 KiB
TypeScript
import { DeesElement, property, html, customElement, domtools, type TemplateResult, type CSSResult, css, cssManager } from '@design.estate/dees-element';
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import { DeesInputBase } from '../dees-input-base.js';
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import { PdfManager } from '../dees-pdf-shared/PdfManager.js';
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import { viewerStyles } from './styles.js';
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import { demo as demoFunc } from './demo.js';
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import { DeesContextmenu } from '../dees-contextmenu.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-viewer': DeesPdfViewer;
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}
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}
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@customElement('dees-pdf-viewer')
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export class DeesPdfViewer extends DeesElement {
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public static demo = demoFunc;
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public static styles = viewerStyles;
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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 initialPage: number = 1;
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@property({ type: String })
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public initialZoom: 'auto' | 'page-fit' | 'page-width' | number = 'auto';
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@property({ type: Boolean })
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public showToolbar: boolean = true;
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@property({ type: Boolean })
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public showSidebar: boolean = false;
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@property({ type: Number })
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private currentPage: number = 1;
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@property({ type: Number })
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private totalPages: number = 1;
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@property({ type: Number })
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private currentZoom: number = 1;
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@property({ type: Boolean })
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private loading: boolean = false;
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private pdfDocument: any;
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private pageRendering: boolean = false;
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private pageNumPending: number | null = null;
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private canvas: HTMLCanvasElement;
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private ctx: CanvasRenderingContext2D;
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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 class="pdf-viewer ${this.showSidebar ? 'with-sidebar' : ''}">
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${this.showToolbar ? html`
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<div class="toolbar">
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<div class="toolbar-group">
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<button
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class="toolbar-button"
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@click=${this.previousPage}
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?disabled=${this.currentPage <= 1}
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>
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<dees-icon icon="lucide:ChevronLeft"></dees-icon>
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</button>
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<div class="page-info">
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<input
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type="number"
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min="1"
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max="${this.totalPages}"
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.value=${this.currentPage}
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@change=${this.handlePageInput}
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class="page-input"
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/>
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<span class="page-separator">/</span>
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<span class="page-total">${this.totalPages}</span>
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</div>
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<button
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class="toolbar-button"
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@click=${this.nextPage}
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?disabled=${this.currentPage >= this.totalPages}
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>
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<dees-icon icon="lucide:ChevronRight"></dees-icon>
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</button>
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</div>
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<div class="toolbar-group">
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<button
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class="toolbar-button"
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@click=${this.zoomOut}
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?disabled=${this.currentZoom <= 0.5}
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>
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<dees-icon icon="lucide:ZoomOut"></dees-icon>
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</button>
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<button
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class="toolbar-button"
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@click=${this.resetZoom}
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>
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<span class="zoom-level">${Math.round(this.currentZoom * 100)}%</span>
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</button>
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<button
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class="toolbar-button"
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@click=${this.zoomIn}
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?disabled=${this.currentZoom >= 3}
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>
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<dees-icon icon="lucide:ZoomIn"></dees-icon>
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</button>
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</div>
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<div class="toolbar-group">
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<button
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class="toolbar-button"
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@click=${this.fitToPage}
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title="Fit to page"
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>
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<dees-icon icon="lucide:Maximize"></dees-icon>
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</button>
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<button
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class="toolbar-button"
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@click=${this.fitToWidth}
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title="Fit to width"
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>
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<dees-icon icon="lucide:ArrowLeftRight"></dees-icon>
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</button>
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</div>
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<div class="toolbar-group toolbar-group--end">
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<button
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class="toolbar-button"
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@click=${this.downloadPdf}
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title="Download"
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>
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<dees-icon icon="lucide:Download"></dees-icon>
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</button>
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<button
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class="toolbar-button"
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@click=${this.printPdf}
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title="Print"
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>
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<dees-icon icon="lucide:Printer"></dees-icon>
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</button>
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</div>
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</div>
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` : ''}
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<div class="viewer-container">
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${this.showSidebar ? html`
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<div class="sidebar">
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<div class="sidebar-header">
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<span>Pages</span>
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<button
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class="sidebar-close"
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@click=${() => this.showSidebar = false}
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>
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<dees-icon icon="lucide:X"></dees-icon>
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</button>
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</div>
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<div class="sidebar-content">
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${Array(this.totalPages).fill(0).map((_, i) => html`
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<div
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class="thumbnail ${this.currentPage === i + 1 ? 'active' : ''}"
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@click=${() => this.goToPage(i + 1)}
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>
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<canvas class="thumbnail-canvas" data-page="${i + 1}"></canvas>
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<span class="thumbnail-number">${i + 1}</span>
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</div>
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`)}
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</div>
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</div>
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` : ''}
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<div class="viewer-main">
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${this.loading ? html`
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<div class="loading-container">
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<div class="loading-spinner"></div>
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<div class="loading-text">Loading PDF...</div>
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</div>
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` : html`
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<div class="canvas-container">
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<canvas id="pdf-canvas"></canvas>
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</div>
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`}
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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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public async connectedCallback() {
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super.connectedCallback();
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await this.updateComplete;
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if (this.pdfUrl) {
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await this.loadPdf();
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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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await this.loadPdf();
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}
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}
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private async loadPdf() {
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this.loading = true;
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try {
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this.pdfDocument = await PdfManager.loadDocument(this.pdfUrl);
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this.totalPages = this.pdfDocument.numPages;
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this.currentPage = this.initialPage;
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await this.updateComplete;
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this.canvas = this.shadowRoot?.querySelector('#pdf-canvas') as HTMLCanvasElement;
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this.ctx = this.canvas?.getContext('2d') as CanvasRenderingContext2D;
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await this.renderPage(this.currentPage);
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if (this.showSidebar) {
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this.renderThumbnails();
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}
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} catch (error) {
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console.error('Error loading PDF:', error);
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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 renderPage(pageNum: number) {
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if (!this.pdfDocument || !this.canvas || !this.ctx) return;
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this.pageRendering = true;
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try {
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const page = await this.pdfDocument.getPage(pageNum);
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let viewport;
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if (this.initialZoom === 'auto' || this.initialZoom === 'page-fit') {
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const tempViewport = page.getViewport({ scale: 1 });
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const containerWidth = this.canvas.parentElement?.clientWidth || 800;
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const containerHeight = this.canvas.parentElement?.clientHeight || 600;
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const scaleX = containerWidth / tempViewport.width;
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const scaleY = containerHeight / tempViewport.height;
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this.currentZoom = Math.min(scaleX, scaleY);
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viewport = page.getViewport({ scale: this.currentZoom });
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} else if (this.initialZoom === 'page-width') {
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const tempViewport = page.getViewport({ scale: 1 });
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const containerWidth = this.canvas.parentElement?.clientWidth || 800;
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this.currentZoom = containerWidth / tempViewport.width;
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viewport = page.getViewport({ scale: this.currentZoom });
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} else {
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this.currentZoom = typeof this.initialZoom === 'number' ? this.initialZoom : 1;
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viewport = page.getViewport({ scale: this.currentZoom });
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}
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this.canvas.height = viewport.height;
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this.canvas.width = viewport.width;
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const renderContext = {
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canvasContext: this.ctx,
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viewport: viewport,
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};
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await page.render(renderContext).promise;
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this.pageRendering = false;
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if (this.pageNumPending !== null) {
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await this.renderPage(this.pageNumPending);
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this.pageNumPending = null;
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}
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} catch (error) {
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console.error('Error rendering page:', error);
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this.pageRendering = false;
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}
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}
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private queueRenderPage(pageNum: number) {
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if (this.pageRendering) {
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this.pageNumPending = pageNum;
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} else {
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this.renderPage(pageNum);
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}
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}
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private async renderThumbnails() {
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await this.updateComplete;
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const thumbnails = this.shadowRoot?.querySelectorAll('.thumbnail-canvas') as NodeListOf<HTMLCanvasElement>;
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const thumbnailWidth = 176; // Fixed width for thumbnails (200px container - 24px padding)
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for (const canvas of Array.from(thumbnails)) {
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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 thumbnail width while maintaining aspect ratio
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const initialViewport = page.getViewport({ scale: 1 });
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const scale = thumbnailWidth / initialViewport.width;
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const viewport = page.getViewport({ scale });
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// Set canvas dimensions to actual render size
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canvas.width = viewport.width;
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canvas.height = viewport.height;
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// Also set the display size via style to ensure proper display
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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 context = canvas.getContext('2d');
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const renderContext = {
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canvasContext: context,
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viewport: viewport,
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};
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await page.render(renderContext).promise;
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}
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}
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private previousPage() {
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if (this.currentPage > 1) {
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this.currentPage--;
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this.queueRenderPage(this.currentPage);
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}
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}
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private nextPage() {
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if (this.currentPage < this.totalPages) {
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this.currentPage++;
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this.queueRenderPage(this.currentPage);
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}
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}
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private goToPage(pageNum: number) {
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if (pageNum >= 1 && pageNum <= this.totalPages) {
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this.currentPage = pageNum;
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this.queueRenderPage(this.currentPage);
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}
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}
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private handlePageInput(e: Event) {
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const input = e.target as HTMLInputElement;
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const pageNum = parseInt(input.value);
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this.goToPage(pageNum);
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}
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private zoomIn() {
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if (this.currentZoom < 3) {
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this.currentZoom = Math.min(3, this.currentZoom * 1.2);
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this.queueRenderPage(this.currentPage);
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}
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}
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private zoomOut() {
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if (this.currentZoom > 0.5) {
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this.currentZoom = Math.max(0.5, this.currentZoom / 1.2);
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this.queueRenderPage(this.currentPage);
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}
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}
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private resetZoom() {
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this.currentZoom = 1;
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this.queueRenderPage(this.currentPage);
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}
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private fitToPage() {
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this.initialZoom = 'page-fit';
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this.queueRenderPage(this.currentPage);
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}
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private fitToWidth() {
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this.initialZoom = 'page-width';
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this.queueRenderPage(this.currentPage);
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}
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private downloadPdf() {
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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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private printPdf() {
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window.open(this.pdfUrl, '_blank')?.print();
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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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return [
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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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this.downloadPdf();
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}
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},
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{
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name: 'Print PDF',
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iconName: 'lucide:Printer',
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action: async () => {
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this.printPdf();
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}
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}
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];
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}
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} |