TekH
6da68cdc86
Updated `getSignatureNavState`, `goToNextSignature`, and `goToPreviousSignature` methods to enhance code readability by improving comments and clarifying logic. Fixed a minor bug in `goToPreviousSignature` where the wrong variable (`lastSig`) was used for page navigation, replacing it with the correct variable (`prevSignature`). Ensured `_lastViewedSignatureId` is updated correctly in navigation methods. No significant functional changes were introduced.
1020 lines
37 KiB
JavaScript
1020 lines
37 KiB
JavaScript
// PDF.js Viewer for Blazor WASM
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window.pdfViewer = {
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pdfDoc: null,
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pageNum: 1,
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pageRendering: false,
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pageNumPending: null,
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scale: 1.5,
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canvas: null,
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ctx: null,
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totalPages: 0,
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currentRenderTask: null,
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dotNetReference: null,
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wheelEventAttached: false,
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_renderLock: false, // Lock to prevent concurrent renders
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// Quality options (configurable from appsettings.json)
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qualityOptions: {
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thumbnailBaseScale: 0.75,
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thumbnailEnableHiDPI: true,
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thumbnailMaxDPR: 2.0,
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mainCanvasEnableHiDPI: true,
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mainCanvasMaxDPR: 2.0,
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enableSmoothZoom: true,
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zoomTransitionDuration: 150,
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renderingOpacity: 0.85,
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zoomStepPercentage: 5
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},
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setQualityOptions(options) {
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this.qualityOptions = { ...this.qualityOptions, ...options };
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// Apply CSS variables for dynamic styling
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document.documentElement.style.setProperty('--zoom-transition-duration', `${options.zoomTransitionDuration}ms`);
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document.documentElement.style.setProperty('--rendering-opacity', options.renderingOpacity);
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},
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async initialize(canvasId, pdfDataUrl, dotNetRef) {
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try {
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this.dotNetReference = dotNetRef;
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if (typeof window.pdfjsLib === 'undefined') {
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await this.waitForPdfJs();
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}
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const pdfjsLib = window.pdfjsLib;
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pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
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this.canvas = document.getElementById(canvasId);
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if (!this.canvas) {
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return false;
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}
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this.ctx = this.canvas.getContext('2d');
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this.attachWheelEvent();
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const uint8Array = this.base64ToUint8Array(pdfDataUrl);
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const loadingTask = pdfjsLib.getDocument({ data: uint8Array });
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this.pdfDoc = await loadingTask.promise;
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this.totalPages = this.pdfDoc.numPages;
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await this.renderPage(this.pageNum);
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return true;
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} catch (error) {
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console.error('PDF viewer initialization failed:', error);
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return false;
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}
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},
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attachWheelEvent() {
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if (this.wheelEventAttached) return;
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// Attach to the entire document body for global zoom control
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document.body.addEventListener('wheel', (e) => {
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// Check if Ctrl key is pressed (zoom gesture)
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if (e.ctrlKey || e.metaKey) {
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e.preventDefault();
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const step = this.qualityOptions.zoomStepPercentage / 100; // Convert to decimal
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if (e.deltaY < 0) {
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// Scroll up = Zoom In
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this.scale = Math.min(this.scale + step, 3.0);
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this.queueRenderPage(this.pageNum);
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if (this.dotNetReference) {
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this.dotNetReference.invokeMethodAsync('OnZoomChanged', this.scale);
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}
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} else {
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// Scroll down = Zoom Out
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this.scale = Math.max(this.scale - step, 0.5);
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this.queueRenderPage(this.pageNum);
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if (this.dotNetReference) {
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this.dotNetReference.invokeMethodAsync('OnZoomChanged', this.scale);
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}
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}
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}
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}, { passive: false });
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this.wheelEventAttached = true;
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},
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async waitForPdfJs() {
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for (let i = 0; i < 50; i++) {
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if (typeof window.pdfjsLib !== 'undefined') {
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return;
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}
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await new Promise(resolve => setTimeout(resolve, 100));
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}
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throw new Error('PDF.js failed to load after 5 seconds');
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},
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base64ToUint8Array(base64) {
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// Remove data URL prefix if present
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const base64String = base64.includes(',') ? base64.split(',')[1] : base64;
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const raw = atob(base64String);
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const uint8Array = new Uint8Array(raw.length);
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for (let i = 0; i < raw.length; i++) {
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uint8Array[i] = raw.charCodeAt(i);
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}
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return uint8Array;
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},
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async renderPage(num) {
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// CRITICAL: Single render at a time - use a lock
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if (this._renderLock) {
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// Another render is in progress, queue it
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this.pageNumPending = num;
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return;
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}
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this._renderLock = true;
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// Cancel any existing render task
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if (this.currentRenderTask) {
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try {
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this.currentRenderTask.cancel();
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await new Promise(resolve => setTimeout(resolve, 100));
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} catch (e) {
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// Ignore cancellation errors
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}
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this.currentRenderTask = null;
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}
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this.pageRendering = true;
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// Add rendering class for smooth transition (if enabled)
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if (this.qualityOptions.enableSmoothZoom) {
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this.canvas.classList.add('rendering');
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}
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try {
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// Get scroll container
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const container = this.canvas.closest('.pdf-canvas-wrapper');
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// Store scroll position and viewport center BEFORE rendering
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let scrollLeft = 0, scrollTop = 0;
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let centerX = 0, centerY = 0;
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let oldWidth = this.canvas.width;
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let oldHeight = this.canvas.height;
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if (container) {
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scrollLeft = container.scrollLeft;
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scrollTop = container.scrollTop;
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centerX = scrollLeft + container.clientWidth / 2;
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centerY = scrollTop + container.clientHeight / 2;
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}
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const page = await this.pdfDoc.getPage(num);
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// HiDPI support for main canvas (configurable)
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const dpr = this.qualityOptions.mainCanvasEnableHiDPI
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? Math.min(window.devicePixelRatio || 1, this.qualityOptions.mainCanvasMaxDPR)
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: 1.0;
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const viewport = page.getViewport({ scale: this.scale * dpr });
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// Set internal canvas resolution (high quality)
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this.canvas.width = viewport.width;
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this.canvas.height = viewport.height;
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// Set CSS display size (visual size)
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this.canvas.style.width = `${viewport.width / dpr}px`;
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this.canvas.style.height = `${viewport.height / dpr}px`;
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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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// Enable high-quality rendering
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this.ctx.imageSmoothingEnabled = true;
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this.ctx.imageSmoothingQuality = 'high';
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// Start new render task
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this.currentRenderTask = page.render(renderContext);
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await this.currentRenderTask.promise;
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// Render text layer for copy-paste functionality
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await this.renderTextLayer(page, viewport, dpr);
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// Restore viewport center position AFTER rendering
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if (container && oldWidth > 0 && oldHeight > 0) {
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const scaleX = this.canvas.width / oldWidth;
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const scaleY = this.canvas.height / oldHeight;
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const newCenterX = centerX * scaleX;
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const newCenterY = centerY * scaleY;
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container.scrollLeft = newCenterX - container.clientWidth / 2;
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container.scrollTop = newCenterY - container.clientHeight / 2;
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}
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// Remove rendering class after completion
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if (this.qualityOptions.enableSmoothZoom) {
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this.canvas.classList.remove('rendering');
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}
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this.currentRenderTask = null;
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this.pageRendering = false;
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} catch (error) {
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if (error.name !== 'RenderingCancelledException') {
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console.error('Render error:', error);
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}
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this.canvas.classList.remove('rendering');
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this.currentRenderTask = null;
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this.pageRendering = false;
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} finally {
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// Always release lock
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this._renderLock = false;
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// Process pending render
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if (this.pageNumPending !== null) {
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const pendingPage = this.pageNumPending;
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this.pageNumPending = null;
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this.renderPage(pendingPage);
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}
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}
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},
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async renderTextLayer(page, viewport, dpr) {
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try {
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const textLayerDiv = document.getElementById('pdf-text-layer');
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if (!textLayerDiv) {
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return;
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}
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// Clear previous text layer
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textLayerDiv.innerHTML = '';
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// Set text layer dimensions to match canvas display size
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textLayerDiv.style.width = `${viewport.width / dpr}px`;
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textLayerDiv.style.height = `${viewport.height / dpr}px`;
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// Set --scale-factor CSS variable required by PDF.js
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textLayerDiv.style.setProperty('--scale-factor', this.scale);
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// Get text content from PDF
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const textContent = await page.getTextContent();
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// Create viewport for text layer (without DPR scaling for positioning)
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const textViewport = page.getViewport({ scale: this.scale });
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// Render text layer using PDF.js built-in function
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const pdfjsLib = window.pdfjsLib;
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await pdfjsLib.renderTextLayer({
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textContentSource: textContent,
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container: textLayerDiv,
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viewport: textViewport,
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textDivs: []
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}).promise;
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} catch (error) {
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// Silently handle text layer errors (non-critical feature)
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}
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},
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queueRenderPage(num) {
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// Always use pending mechanism to avoid race conditions
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if (this.pageRendering || this.currentRenderTask) {
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this.pageNumPending = num;
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} else {
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this.renderPage(num);
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}
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},
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nextPage() {
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if (this.pageNum >= this.totalPages) {
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return false;
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}
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this.pageNum++;
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this.queueRenderPage(this.pageNum);
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return true;
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},
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previousPage() {
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if (this.pageNum <= 1) {
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return false;
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}
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this.pageNum--;
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this.queueRenderPage(this.pageNum);
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return true;
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},
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goToPage(num) {
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if (num < 1 || num > this.totalPages) {
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return false;
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}
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this.pageNum = num;
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this.queueRenderPage(this.pageNum);
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return true;
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},
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zoomIn() {
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const step = this.qualityOptions.zoomStepPercentage / 100;
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this.scale = Math.min(this.scale + step, 3.0);
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this.queueRenderPage(this.pageNum);
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},
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zoomOut() {
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const step = this.qualityOptions.zoomStepPercentage / 100;
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this.scale = Math.max(this.scale - step, 0.5);
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this.queueRenderPage(this.pageNum);
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},
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setScale(scale) {
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if (scale >= 0.5 && scale <= 3.0) {
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this.scale = scale;
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this.queueRenderPage(this.pageNum);
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}
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},
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async fitToWidth() {
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const container = this.canvas.closest('.pdf-frame');
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if (!container || !this.pdfDoc) return;
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try {
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const page = await this.pdfDoc.getPage(this.pageNum);
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const viewport = page.getViewport({ scale: 1.0 });
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const containerWidth = container.clientWidth - 80;
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const optimalScale = containerWidth / viewport.width;
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this.scale = Math.min(Math.max(optimalScale, 0.5), 3.0);
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this.queueRenderPage(this.pageNum);
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} catch (error) {
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console.error('Error fitting to width:', error);
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}
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},
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async renderThumbnail(pageNum, canvasId) {
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if (!this.pdfDoc) {
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return;
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}
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try {
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// Wait for canvas to be in DOM
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let canvas = document.getElementById(canvasId);
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let retries = 0;
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while (!canvas && retries < 10) {
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await new Promise(resolve => setTimeout(resolve, 100));
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canvas = document.getElementById(canvasId);
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retries++;
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}
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if (!canvas) {
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return;
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}
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// Check if canvas is already being used by a render task
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if (canvas._renderTask) {
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try {
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await canvas._renderTask;
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} catch (e) {
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// Ignore cancellation errors
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}
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}
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const page = await this.pdfDoc.getPage(pageNum);
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// High-quality rendering with HiDPI support (configurable)
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const dpr = this.qualityOptions.thumbnailEnableHiDPI
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? Math.min(window.devicePixelRatio || 1, this.qualityOptions.thumbnailMaxDPR)
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: 1.0;
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const baseScale = this.qualityOptions.thumbnailBaseScale;
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const scale = baseScale * dpr;
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const viewport = page.getViewport({ scale: scale });
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// Set actual canvas pixel dimensions (internal resolution)
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canvas.width = viewport.width;
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canvas.height = viewport.height;
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// Remove any inline styles - let CSS handle display size
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canvas.style.width = '';
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canvas.style.height = '';
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const ctx = canvas.getContext('2d');
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// Enable maximum quality rendering
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ctx.imageSmoothingEnabled = true;
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ctx.imageSmoothingQuality = 'high';
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const renderContext = {
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canvasContext: ctx,
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viewport: viewport
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};
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// Store render task on canvas to track active renders
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const renderTask = page.render(renderContext);
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canvas._renderTask = renderTask.promise;
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await renderTask.promise;
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// Clear the task when done
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delete canvas._renderTask;
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} catch (error) {
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// Silently handle thumbnail errors (non-critical)
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}
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},
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getCurrentPage() {
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return this.pageNum;
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},
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getTotalPages() {
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return this.totalPages;
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},
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getScale() {
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return this.scale;
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},
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dispose() {
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if (this.wheelEventAttached) {
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this.wheelEventAttached = false;
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this.dotNetReference = null;
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}
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this.detachResizeListeners();
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},
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// Resizable splitter functionality
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isResizing: false,
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resizeMouseMoveHandler: null,
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resizeMouseUpHandler: null,
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attachResizeListeners(dotNetRef) {
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this.dotNetReference = dotNetRef;
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this.resizeMouseMoveHandler = (e) => {
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if (this.isResizing && this.dotNetReference) {
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this.dotNetReference.invokeMethodAsync('OnSplitterMouseMove', e.clientX);
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}
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};
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this.resizeMouseUpHandler = () => {
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if (this.isResizing && this.dotNetReference) {
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this.isResizing = false;
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this.dotNetReference.invokeMethodAsync('OnSplitterMouseUp');
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}
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};
|
||
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document.addEventListener('mousemove', this.resizeMouseMoveHandler);
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||
document.addEventListener('mouseup', this.resizeMouseUpHandler);
|
||
},
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||
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detachResizeListeners() {
|
||
if (this.resizeMouseMoveHandler) {
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||
document.removeEventListener('mousemove', this.resizeMouseMoveHandler);
|
||
this.resizeMouseMoveHandler = null;
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}
|
||
if (this.resizeMouseUpHandler) {
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document.removeEventListener('mouseup', this.resizeMouseUpHandler);
|
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this.resizeMouseUpHandler = null;
|
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}
|
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this.isResizing = false;
|
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},
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||
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startResize() {
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||
this.isResizing = true;
|
||
},
|
||
|
||
// Signature button functionality
|
||
signatureButtons: [],
|
||
appliedSignatures: [], // Track which signatures have been applied
|
||
_lastViewedSignatureId: null, // Track last viewed signature for navigation
|
||
|
||
/**
|
||
* Gets signature navigation state (for toolbar display)
|
||
* @returns {object} { total, signed, unsigned, currentIndex, canGoPrev, canGoNext }
|
||
*/
|
||
getSignatureNavState() {
|
||
// Global imza listesi yoksa bo? state d<>n
|
||
if (!this._allSignatures || this._allSignatures.length === 0) {
|
||
return {
|
||
total: 0,
|
||
signed: 0,
|
||
unsigned: 0,
|
||
currentIndex: -1,
|
||
canGoPrev: false,
|
||
canGoNext: false
|
||
};
|
||
}
|
||
|
||
// T<>M sayfalardaki imzalar? say (database'den gelen global liste)
|
||
const total = this._allSignatures.length; // Global: Toplam imza say?s?
|
||
const signed = this.appliedSignatures.length; // ?mzalananlar
|
||
const unsigned = total - signed; // Hesaplanan: ?mzalanmayanlar
|
||
|
||
return {
|
||
total: total,
|
||
signed: signed,
|
||
unsigned: unsigned,
|
||
currentIndex: signed,
|
||
canGoPrev: total > 0, // Her zaman aktif (e?er imza varsa)
|
||
canGoNext: total > 0 // Her zaman aktif (e?er imza varsa)
|
||
};
|
||
},
|
||
|
||
/**
|
||
* Navigates to the next unsigned signature button.
|
||
* Scrolls to button position and changes page if necessary.
|
||
* Cross-page navigation: searches ALL pages for next unsigned signature.
|
||
*/
|
||
async goToNextSignature(dotNetRef) {
|
||
// Global imza listesi yoksa <20>?k
|
||
if (!this._allSignatures || this._allSignatures.length === 0) {
|
||
return false;
|
||
}
|
||
|
||
// Mevcut g<>r<EFBFBD>nt<6E>lenen imzan?n index'ini bul
|
||
let currentIndex = -1;
|
||
if (this._lastViewedSignatureId) {
|
||
currentIndex = this._allSignatures.findIndex(s => s.id === this._lastViewedSignatureId);
|
||
}
|
||
|
||
// Bir sonraki imzay? al (imzalanm?? olup olmad???na bakmadan)
|
||
let nextIndex = currentIndex + 1;
|
||
|
||
// Sonsuz d<>ng<6E>: Son imzadaysa ilk imzaya d<>n
|
||
if (nextIndex >= this._allSignatures.length) {
|
||
nextIndex = 0; // ?lk imzaya d<>n
|
||
}
|
||
|
||
const nextSignature = this._allSignatures[nextIndex];
|
||
|
||
// Farkl? sayfadaysa sayfa de?i?tir
|
||
if (nextSignature.page !== this.pageNum) {
|
||
// Sayfa de?i?tir
|
||
this.pageNum = nextSignature.page;
|
||
this.queueRenderPage(this.pageNum);
|
||
|
||
// Render tamamlanana kadar bekle
|
||
let waitCount = 0;
|
||
while (this.pageRendering && waitCount < 20) {
|
||
await new Promise(resolve => setTimeout(resolve, 100));
|
||
waitCount++;
|
||
}
|
||
|
||
// Blazor'a haber ver - signature butonlar?n? yeniden ?iz
|
||
if (dotNetRef) {
|
||
await dotNetRef.invokeMethodAsync('OnPageChangedBySignatureNav', this.pageNum);
|
||
}
|
||
|
||
// Butonlar?n DOM'a eklenmesini bekle
|
||
await new Promise(resolve => setTimeout(resolve, 150));
|
||
}
|
||
|
||
// Son g<>r<EFBFBD>nt<6E>lenen imzay? kaydet
|
||
this._lastViewedSignatureId = nextSignature.id;
|
||
|
||
// ?mza imzalanm?? m? kontrol et
|
||
const isApplied = this.appliedSignatures.some(s => s.id === nextSignature.id);
|
||
|
||
if (isApplied) {
|
||
// ?mzalanm?? - overlay container'? bul ve scroll yap
|
||
const container = document.querySelector(`.applied-signature[data-signature-id="${nextSignature.id}"]`);
|
||
if (container) {
|
||
this.scrollToElement(container);
|
||
}
|
||
} else {
|
||
// ?mzalanmam?? - butonu bul ve scroll yap
|
||
const button = this.signatureButtons.find(btn =>
|
||
parseInt(btn.getAttribute('data-signature-id')) === nextSignature.id
|
||
);
|
||
if (button) {
|
||
this.scrollToButton(button);
|
||
}
|
||
}
|
||
|
||
// Counter'? g<>ncelle (Blazor'a bildir)
|
||
if (dotNetRef) {
|
||
dotNetRef.invokeMethodAsync('OnSignatureNavChanged');
|
||
}
|
||
|
||
return true;
|
||
},
|
||
|
||
/**
|
||
* Navigates to the previous signature (last applied one).
|
||
* Scrolls to signature position and changes page if necessary.
|
||
*/
|
||
async goToPreviousSignature(dotNetRef) {
|
||
if (!this._allSignatures || this._allSignatures.length === 0) {
|
||
return false;
|
||
}
|
||
|
||
// Mevcut g<>r<EFBFBD>nt<6E>lenen imzan?n index'ini bul
|
||
let currentIndex = this._allSignatures.length; // Varsay?lan: son imzadan sonra
|
||
if (this._lastViewedSignatureId) {
|
||
currentIndex = this._allSignatures.findIndex(s => s.id === this._lastViewedSignatureId);
|
||
}
|
||
|
||
// Bir <20>nceki imzay? al
|
||
let prevIndex = currentIndex - 1;
|
||
|
||
// Sonsuz d<>ng<6E>: ?lk imzadaysa son imzaya git
|
||
if (prevIndex < 0) {
|
||
prevIndex = this._allSignatures.length - 1; // Son imzaya git
|
||
}
|
||
|
||
const prevSignature = this._allSignatures[prevIndex];
|
||
|
||
// Change page if needed
|
||
if (prevSignature.page !== this.pageNum) {
|
||
// Sayfa de?i?tir
|
||
this.pageNum = prevSignature.page;
|
||
this.queueRenderPage(this.pageNum);
|
||
|
||
// Render tamamlanana kadar bekle
|
||
let waitCount = 0;
|
||
while (this.pageRendering && waitCount < 20) {
|
||
await new Promise(resolve => setTimeout(resolve, 100));
|
||
waitCount++;
|
||
}
|
||
|
||
// Blazor'a haber ver - signature butonlar?n? yeniden <20>iz
|
||
if (dotNetRef) {
|
||
await dotNetRef.invokeMethodAsync('OnPageChangedBySignatureNav', this.pageNum);
|
||
}
|
||
|
||
// DOM g<>ncellenmesini bekle
|
||
await new Promise(resolve => setTimeout(resolve, 150));
|
||
}
|
||
|
||
// Son g<>r<EFBFBD>nt<6E>lenen imzay? kaydet
|
||
this._lastViewedSignatureId = prevSignature.id;
|
||
|
||
// ?mza imzalanm?? m? kontrol et
|
||
const isApplied = this.appliedSignatures.some(s => s.id === prevSignature.id);
|
||
|
||
if (isApplied) {
|
||
// ?mzalanm?? - overlay container'? bul ve scroll yap
|
||
const container = document.querySelector(`.applied-signature[data-signature-id="${prevSignature.id}"]`);
|
||
if (container) {
|
||
this.scrollToElement(container);
|
||
}
|
||
} else {
|
||
// ?mzalanmam?? - butonu bul ve scroll yap
|
||
const button = this.signatureButtons.find(btn =>
|
||
parseInt(btn.getAttribute('data-signature-id')) === prevSignature.id
|
||
);
|
||
if (button) {
|
||
this.scrollToButton(button);
|
||
}
|
||
}
|
||
|
||
// Notify Blazor
|
||
if (dotNetRef) {
|
||
dotNetRef.invokeMethodAsync('OnSignatureNavChanged');
|
||
}
|
||
|
||
return true;
|
||
},
|
||
|
||
/**
|
||
* Scrolls to center a button in the viewport
|
||
*/
|
||
scrollToButton(button) {
|
||
const wrapper = this.canvas.closest('.pdf-canvas-wrapper');
|
||
if (!wrapper) return;
|
||
|
||
const buttonRect = button.getBoundingClientRect();
|
||
const wrapperRect = wrapper.getBoundingClientRect();
|
||
|
||
// Calculate scroll to center button
|
||
const scrollLeft = wrapper.scrollLeft + buttonRect.left - wrapperRect.left - (wrapperRect.width / 2) + (buttonRect.width / 2);
|
||
const scrollTop = wrapper.scrollTop + buttonRect.top - wrapperRect.top - (wrapperRect.height / 2) + (buttonRect.height / 2);
|
||
|
||
wrapper.scrollTo({
|
||
left: scrollLeft,
|
||
top: scrollTop,
|
||
behavior: 'smooth'
|
||
});
|
||
},
|
||
|
||
/**
|
||
* Scrolls to center an element in the viewport
|
||
*/
|
||
scrollToElement(element) {
|
||
const wrapper = this.canvas.closest('.pdf-canvas-wrapper');
|
||
if (!wrapper) return;
|
||
|
||
const elemRect = element.getBoundingClientRect();
|
||
const wrapperRect = wrapper.getBoundingClientRect();
|
||
|
||
const scrollLeft = wrapper.scrollLeft + elemRect.left - wrapperRect.left - (wrapperRect.width / 2) + (elemRect.width / 2);
|
||
const scrollTop = wrapper.scrollTop + elemRect.top - wrapperRect.top - (wrapperRect.height / 2) + (elemRect.height / 2);
|
||
|
||
wrapper.scrollTo({
|
||
left: scrollLeft,
|
||
top: scrollTop,
|
||
behavior: 'smooth'
|
||
});
|
||
},
|
||
|
||
/**
|
||
* Renders clickable signature buttons on the PDF canvas.
|
||
* @param {Array} signatures - Array of SignatureDto objects with x, y coordinates in PDF POINTS
|
||
* @param {number} currentPageNum - Current page number (1-based)
|
||
* @param {object} dotNetRef - .NET reference for callbacks
|
||
*/
|
||
async renderSignatureButtons(signatures, currentPageNum, dotNetRef) {
|
||
// Clear existing buttons (NOT applied signatures!)
|
||
this.clearSignatureButtons();
|
||
|
||
if (!this.pdfDoc || !signatures || signatures.length === 0) {
|
||
return;
|
||
}
|
||
|
||
this.dotNetReference = dotNetRef;
|
||
this._allSignatures = signatures; // Store for navigation
|
||
|
||
try {
|
||
// CRITICAL: Filter OUT already applied signatures!
|
||
const appliedIds = new Set(this.appliedSignatures.map(s => s.id));
|
||
const pageSignatures = signatures.filter(sig =>
|
||
sig.page === currentPageNum && !appliedIds.has(sig.id) // ? Skip applied ones!
|
||
);
|
||
|
||
if (pageSignatures.length === 0) {
|
||
return;
|
||
}
|
||
|
||
// Get current page and viewport
|
||
const page = await this.pdfDoc.getPage(currentPageNum);
|
||
const dpr = this.qualityOptions.mainCanvasEnableHiDPI
|
||
? Math.min(window.devicePixelRatio || 1, this.qualityOptions.mainCanvasMaxDPR)
|
||
: 1.0;
|
||
const viewport = page.getViewport({ scale: this.scale * dpr });
|
||
|
||
// Get signature layer container
|
||
const signatureLayer = document.getElementById('pdf-signature-layer');
|
||
if (!signatureLayer) {
|
||
console.warn('Signature layer not found');
|
||
return;
|
||
}
|
||
|
||
// Set signature layer dimensions to match canvas display size
|
||
signatureLayer.style.width = `${viewport.width / dpr}px`;
|
||
signatureLayer.style.height = `${viewport.height / dpr}px`;
|
||
|
||
// Create button for each UNSIGNED signature
|
||
pageSignatures.forEach(sig => {
|
||
// Coordinates are in PDF POINTS - convert to display pixels
|
||
const xPx = (sig.x * this.scale);
|
||
const yPx = (sig.y * this.scale);
|
||
|
||
// Create button element
|
||
const button = document.createElement('button');
|
||
button.className = 'signature-button';
|
||
button.setAttribute('data-signature-id', sig.id);
|
||
button.setAttribute('type', 'button');
|
||
button.setAttribute('tabindex', '0');
|
||
button.style.position = 'absolute';
|
||
button.style.left = `${xPx}px`;
|
||
button.style.top = `${yPx}px`;
|
||
button.style.width = '150px';
|
||
button.style.height = '60px';
|
||
button.style.backgroundColor = '#4F46E5';
|
||
button.style.color = 'white';
|
||
button.style.border = 'none';
|
||
button.style.borderRadius = '8px';
|
||
button.style.cursor = 'pointer';
|
||
button.style.fontSize = '16px';
|
||
button.style.fontWeight = '600';
|
||
button.style.display = 'flex';
|
||
button.style.flexDirection = 'column';
|
||
button.style.alignItems = 'center';
|
||
button.style.justifyContent = 'center';
|
||
button.style.gap = '4px';
|
||
button.style.boxShadow = '0 2px 8px rgba(0,0,0,0.15)';
|
||
button.style.transition = 'all 0.2s ease';
|
||
button.style.zIndex = '100';
|
||
|
||
// Add text
|
||
const textDiv = document.createElement('div');
|
||
textDiv.textContent = 'Unterschreiben';
|
||
textDiv.style.fontSize = '18px';
|
||
textDiv.style.fontWeight = '700';
|
||
|
||
// Add SVG icon
|
||
const svgNS = 'http://www.w3.org/2000/svg';
|
||
const svg = document.createElementNS(svgNS, 'svg');
|
||
svg.setAttribute('width', '24');
|
||
svg.setAttribute('height', '24');
|
||
svg.setAttribute('viewBox', '0 8 32 36');
|
||
svg.setAttribute('fill', 'none');
|
||
svg.style.filter = 'drop-shadow(0 1px 2px rgba(0,0,0,0.2))';
|
||
|
||
const path = document.createElementNS(svgNS, 'path');
|
||
path.setAttribute('fill-rule', 'evenodd');
|
||
path.setAttribute('clip-rule', 'evenodd');
|
||
path.setAttribute('d', 'M25.061 6.90625L23.7115 8.25503C23.2861 8.05188 22.8241 7.9503 22.3621 7.9503C21.5605 7.9503 20.7589 8.25613 20.1483 8.86778L8.18147 20.8336L6.70565 26.7379H6.70557V27.7817H26.5372V26.7379H6.70671L12.6102 25.2623L24.576 13.2955C25.5404 12.3318 25.7445 10.8952 25.1882 9.73146L26.5369 8.38214L25.061 6.90625ZM23.174 10.27C22.9569 10.0539 22.6688 9.93388 22.362 9.93388C22.0551 9.93388 21.767 10.0539 21.5499 10.27L13.5323 18.2876L15.1564 19.9117L23.174 11.8941C23.6218 11.4463 23.6218 10.7177 23.174 10.27ZM14.4922 20.5759L12.868 18.9518L9.97241 21.8475L9.43069 24.0133L11.5965 23.4716L14.4922 20.5759Z');
|
||
path.setAttribute('fill', 'white');
|
||
|
||
svg.appendChild(path);
|
||
button.appendChild(textDiv);
|
||
button.appendChild(svg);
|
||
|
||
// Add hover effect
|
||
button.addEventListener('mouseenter', () => {
|
||
button.style.backgroundColor = '#4338CA';
|
||
button.style.transform = 'scale(1.05)';
|
||
button.style.boxShadow = '0 4px 12px rgba(79, 70, 229, 0.4)';
|
||
});
|
||
button.addEventListener('mouseleave', () => {
|
||
button.style.backgroundColor = '#4F46E5';
|
||
button.style.transform = 'scale(1)';
|
||
button.style.boxShadow = '0 2px 8px rgba(0,0,0,0.15)';
|
||
});
|
||
|
||
// Add click handler
|
||
button.addEventListener('click', () => {
|
||
if (this.dotNetReference) {
|
||
this.dotNetReference.invokeMethodAsync('OnSignatureButtonClick', sig.id);
|
||
}
|
||
});
|
||
|
||
signatureLayer.appendChild(button);
|
||
this.signatureButtons.push(button);
|
||
});
|
||
|
||
} catch (error) {
|
||
console.error('Error rendering signature buttons:', error);
|
||
}
|
||
},
|
||
|
||
/**
|
||
* Clears all signature buttons from the canvas.
|
||
* Also hides applied signatures that don't belong to current page.
|
||
*/
|
||
clearSignatureButtons() {
|
||
// Remove unsigned signature buttons
|
||
this.signatureButtons.forEach(button => {
|
||
if (button.parentNode) {
|
||
button.parentNode.removeChild(button);
|
||
}
|
||
});
|
||
this.signatureButtons = [];
|
||
|
||
// Hide/show applied signatures based on current page
|
||
const signatureLayer = document.getElementById('pdf-signature-layer');
|
||
if (signatureLayer) {
|
||
const appliedContainers = signatureLayer.querySelectorAll('.applied-signature');
|
||
appliedContainers.forEach(container => {
|
||
const signatureId = parseInt(container.getAttribute('data-signature-id'));
|
||
const signature = this._allSignatures?.find(s => s.id === signatureId);
|
||
|
||
if (signature) {
|
||
// Show only if on current page, hide otherwise
|
||
if (signature.page === this.pageNum) {
|
||
container.style.display = ''; // Show
|
||
} else {
|
||
container.style.display = 'none'; // Hide
|
||
}
|
||
}
|
||
});
|
||
}
|
||
},
|
||
|
||
/**
|
||
* Applies a signature to a specific signature field, removing the button and rendering the signature.
|
||
* German standard: Signature image + Name, Position, Place, Date
|
||
* @param {number} signatureId - ID of the signature field
|
||
* @param {string} signatureDataUrl - Base64 PNG data URL of signature
|
||
* @param {string} fullName - Signer's full name
|
||
* @param {string} position - Signer's position (optional, can be empty)
|
||
* @param {string} place - Signing place
|
||
*/
|
||
async applySignature(signatureId, signatureDataUrl, fullName, position, place) {
|
||
try {
|
||
// Find and remove the button
|
||
const buttonIndex = this.signatureButtons.findIndex(btn => {
|
||
return btn.getAttribute('data-signature-id') == signatureId;
|
||
});
|
||
|
||
if (buttonIndex === -1) {
|
||
console.warn(`Signature button #${signatureId} not found`);
|
||
return;
|
||
}
|
||
|
||
const button = this.signatureButtons[buttonIndex];
|
||
const signatureLayer = document.getElementById('pdf-signature-layer');
|
||
|
||
if (!signatureLayer) {
|
||
console.error('Signature layer not found');
|
||
return;
|
||
}
|
||
|
||
// Get button position before removing it
|
||
const left = button.style.left;
|
||
const top = button.style.top;
|
||
|
||
// Find signature data for tracking
|
||
const signature = this._allSignatures?.find(s => s.id === signatureId);
|
||
|
||
// Remove button
|
||
if (button.parentNode) {
|
||
button.parentNode.removeChild(button);
|
||
}
|
||
this.signatureButtons.splice(buttonIndex, 1);
|
||
|
||
// Track applied signature
|
||
if (signature) {
|
||
this.appliedSignatures.push({
|
||
id: signatureId,
|
||
page: signature.page
|
||
});
|
||
}
|
||
|
||
// Create signature container
|
||
const signatureContainer = document.createElement('div');
|
||
signatureContainer.className = 'applied-signature';
|
||
signatureContainer.setAttribute('data-signature-id', signatureId);
|
||
signatureContainer.style.position = 'absolute';
|
||
signatureContainer.style.left = left;
|
||
signatureContainer.style.top = top;
|
||
signatureContainer.style.width = '230px';
|
||
signatureContainer.style.backgroundColor = '#f8f9fa';
|
||
signatureContainer.style.border = '1px solid #dee2e6';
|
||
signatureContainer.style.borderRadius = '6px';
|
||
signatureContainer.style.padding = '12px';
|
||
signatureContainer.style.boxShadow = '0 2px 8px rgba(0,0,0,0.1)';
|
||
signatureContainer.style.fontFamily = "'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif";
|
||
|
||
// Signature image
|
||
const signatureImg = document.createElement('img');
|
||
signatureImg.src = signatureDataUrl;
|
||
signatureImg.alt = 'Unterschrift';
|
||
signatureImg.style.width = '100%';
|
||
signatureImg.style.height = 'auto';
|
||
signatureImg.style.maxHeight = '70px';
|
||
signatureImg.style.display = 'block';
|
||
signatureImg.style.objectFit = 'contain';
|
||
signatureImg.style.marginBottom = '6px';
|
||
|
||
// Separator line (German standard)
|
||
const separator = document.createElement('div');
|
||
separator.style.width = '100%';
|
||
separator.style.height = '1px';
|
||
separator.style.backgroundColor = '#495057';
|
||
separator.style.marginBottom = '8px';
|
||
|
||
// Text information container
|
||
const infoContainer = document.createElement('div');
|
||
infoContainer.style.fontSize = '9px';
|
||
infoContainer.style.lineHeight = '1.4';
|
||
infoContainer.style.color = '#495057';
|
||
infoContainer.style.fontWeight = '400';
|
||
|
||
// Format date (German style: dd.MM.yyyy)
|
||
const today = new Date();
|
||
const dateStr = today.toLocaleDateString('de-DE', {
|
||
day: '2-digit',
|
||
month: '2-digit',
|
||
year: 'numeric'
|
||
});
|
||
|
||
// Build text lines (German standard format)
|
||
const lines = [];
|
||
lines.push(`<strong style="font-weight: 600; color: #212529;">${this.escapeHtml(fullName)}</strong>`);
|
||
|
||
if (position && position.trim() !== '') {
|
||
lines.push(`${this.escapeHtml(position)}`);
|
||
}
|
||
|
||
lines.push(`${this.escapeHtml(place)}, ${dateStr}`);
|
||
|
||
infoContainer.innerHTML = lines.join('<br>');
|
||
|
||
// Assemble container
|
||
signatureContainer.appendChild(signatureImg);
|
||
signatureContainer.appendChild(separator);
|
||
signatureContainer.appendChild(infoContainer);
|
||
|
||
// Add to signature layer
|
||
signatureLayer.appendChild(signatureContainer);
|
||
|
||
console.log(`Signature #${signatureId} applied successfully`);
|
||
|
||
} catch (error) {
|
||
console.error('Error applying signature:', error);
|
||
}
|
||
},
|
||
|
||
/**
|
||
* Escapes HTML to prevent XSS attacks
|
||
*/
|
||
escapeHtml(text) {
|
||
const div = document.createElement('div');
|
||
div.textContent = text;
|
||
return div.innerHTML;
|
||
}
|
||
};
|
||
|
||
|
||
|
||
|
||
|
||
|