Revamped Signing page to allow multiple signatures and images
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Saud Fatayerji
211
src/main/resources/static/js/draggable-utils.js
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211
src/main/resources/static/js/draggable-utils.js
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const DraggableUtils = {
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boxDragContainer: document.getElementById('box-drag-container'),
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pdfCanvas: document.getElementById('pdf-canvas'),
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nextId: 0,
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pdfDoc: null,
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pageIndex: 0,
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init() {
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interact('.draggable-canvas')
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.draggable({
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listeners: {
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move: (event) => {
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const target = event.target;
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const x = (parseFloat(target.getAttribute('data-x')) || 0) + event.dx;
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const y = (parseFloat(target.getAttribute('data-y')) || 0) + event.dy;
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target.style.transform = `translate(${x}px, ${y}px)`;
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target.setAttribute('data-x', x);
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target.setAttribute('data-y', y);
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this.onInteraction(target);
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},
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},
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})
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.resizable({
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edges: { left: true, right: true, bottom: true, top: true },
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listeners: {
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move: (event) => {
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var target = event.target
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var x = (parseFloat(target.getAttribute('data-x')) || 0)
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var y = (parseFloat(target.getAttribute('data-y')) || 0)
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// update the element's style
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target.style.width = event.rect.width + 'px'
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target.style.height = event.rect.height + 'px'
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// translate when resizing from top or left edges
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x += event.deltaRect.left
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y += event.deltaRect.top
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target.style.transform = 'translate(' + x + 'px,' + y + 'px)'
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target.setAttribute('data-x', x)
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target.setAttribute('data-y', y)
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target.textContent = Math.round(event.rect.width) + '\u00D7' + Math.round(event.rect.height)
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this.onInteraction(target);
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},
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},
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modifiers: [
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interact.modifiers.restrictSize({
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min: { width: 50, height: 50 },
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}),
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],
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inertia: true,
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});
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},
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onInteraction(target) {
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this.boxDragContainer.appendChild(target);
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},
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createDraggableCanvas() {
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const createdCanvas = document.createElement('canvas');
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createdCanvas.id = `draggable-canvas-${this.nextId++}`;
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createdCanvas.classList.add("draggable-canvas");
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const x = 0;
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const y = 0;
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createdCanvas.style.transform = `translate(${x}px, ${y}px)`;
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createdCanvas.setAttribute('data-x', x);
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createdCanvas.setAttribute('data-y', y);
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createdCanvas.onclick = e => this.onInteraction(e.target);
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this.boxDragContainer.appendChild(createdCanvas);
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return createdCanvas;
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},
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createDraggableCanvasFromUrl(dataUrl) {
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return new Promise((resolve) => {
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var myImage = new Image();
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myImage.src = dataUrl;
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myImage.onload = () => {
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var createdCanvas = this.createDraggableCanvas();
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createdCanvas.width = myImage.width;
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createdCanvas.height = myImage.height;
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const imgAspect = myImage.width / myImage.height;
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const pdfAspect = this.boxDragContainer.offsetWidth / this.boxDragContainer.offsetHeight;
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var scaleMultiplier;
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if (imgAspect > pdfAspect) {
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scaleMultiplier = this.boxDragContainer.offsetWidth / myImage.width;
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} else {
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scaleMultiplier = this.boxDragContainer.offsetHeight / myImage.height;
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}
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var newWidth = createdCanvas.width;
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var newHeight = createdCanvas.height;
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if (scaleMultiplier < 1) {
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newWidth = newWidth * scaleMultiplier;
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newHeight = newHeight * scaleMultiplier;
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}
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createdCanvas.style.width = newWidth+"px";
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createdCanvas.style.height = newHeight+"px";
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var myContext = createdCanvas.getContext("2d");
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myContext.drawImage(myImage,0,0);
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resolve(createdCanvas);
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}
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})
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},
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deleteDraggableCanvas(element) {
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element.remove();
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},
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deleteDraggableCanvasById(id) {
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this.deleteDraggableCanvas(document.getElementById(id));
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},
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getLastInteracted() {
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return this.boxDragContainer.querySelector(".draggable-canvas:last-of-type");
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},
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async renderPage(pdfDocument, pageIdx) {
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this.pdfDoc = pdfDocument ? pdfDocument : this.pdfDoc;
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this.pageIndex = pageIdx;
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const page = await this.pdfDoc.getPage(this.pageIndex+1);
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// set the canvas size to the size of the page
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if (page.rotate == 90 || page.rotate == 270) {
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this.pdfCanvas.width = page.view[3];
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this.pdfCanvas.height = page.view[2];
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} else {
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this.pdfCanvas.width = page.view[2];
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this.pdfCanvas.height = page.view[3];
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}
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// render the page onto the canvas
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var renderContext = {
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canvasContext: this.pdfCanvas.getContext("2d"),
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viewport: page.getViewport({ scale: 1 })
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};
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await page.render(renderContext).promise;
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//return pdfCanvas.toDataURL();
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},
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async incrementPage() {
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if (this.pageIndex < this.pdfDoc.numPages-1) {
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return await this.renderPage(this.pdfDoc, this.pageIndex+1)
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}
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},
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async decrementPage() {
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if (this.pageIndex > 0) {
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return await this.renderPage(this.pdfDoc, this.pageIndex-1)
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}
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},
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parseTransform(element) {
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const tansform = element.style.transform.replace(/[^.,-\d]/g, '');
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const transformComponents = tansform.split(",");
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return {
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x: parseFloat(transformComponents[0]),
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y: parseFloat(transformComponents[1]),
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width: element.offsetWidth,
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height: element.offsetHeight,
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}
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},
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async getOverlayedPdfDocument() {
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const pdfBytes = await this.pdfDoc.getData();
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const pdfDocModified = await PDFLib.PDFDocument.load(pdfBytes);
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const draggables = this.boxDragContainer.querySelectorAll(".draggable-canvas");
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for (const draggable of draggables) {
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// embed the draggable canvas
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const dataURL = draggable.toDataURL();
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const response = await fetch(dataURL);
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const draggableImgBytes = await response.arrayBuffer();
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const pdfImageObject = await pdfDocModified.embedPng(draggableImgBytes);
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const page = pdfDocModified.getPage(this.pageIndex);
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const draggablePositionPixels = this.parseTransform(draggable);
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const draggablePositionRelative = {
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x: draggablePositionPixels.x / this.pdfCanvas.offsetWidth,
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y: draggablePositionPixels.y / this.pdfCanvas.offsetHeight,
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width: draggablePositionPixels.width / this.pdfCanvas.offsetWidth,
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height: draggablePositionPixels.height / this.pdfCanvas.offsetHeight,
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}
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const draggablePositionPdf = {
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x: draggablePositionRelative.x * page.getWidth(),
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y: draggablePositionRelative.y * page.getHeight(),
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width: draggablePositionRelative.width * page.getWidth(),
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height: draggablePositionRelative.height * page.getHeight(),
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}
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page.drawImage(pdfImageObject, {
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x: draggablePositionPdf.x,
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y: page.getHeight() - draggablePositionPdf.y - draggablePositionPdf.height,
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width: draggablePositionPdf.width,
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height: draggablePositionPdf.height,
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});
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}
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return pdfDocModified;
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},
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}
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document.addEventListener("DOMContentLoaded", () => {
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DraggableUtils.init();
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});
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39
src/main/resources/static/js/tab-container.js
Normal file
39
src/main/resources/static/js/tab-container.js
Normal file
@@ -0,0 +1,39 @@
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TabContainer = {
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initTabGroups() {
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const groups = document.querySelectorAll(".tab-group");
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const unloadedGroups = [...groups].filter(g => !g.initialised);
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unloadedGroups.forEach(group => {
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const containers = group.querySelectorAll(".tab-container");
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const tabTitles = [...containers].map(c => c.getAttribute("title"));
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const tabList = document.createElement("div");
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tabList.classList.add("tab-buttons");
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tabTitles.forEach(title => {
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const tabButton = document.createElement("button");
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tabButton.innerHTML = title;
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tabButton.onclick = e => {
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this.setActiveTab(e.target);
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}
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tabList.appendChild(tabButton);
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});
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group.prepend(tabList);
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this.setActiveTab(tabList.firstChild);
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group.initialised = true;
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});
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},
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setActiveTab(tabButton) {
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const group = tabButton.closest(".tab-group")
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group.querySelectorAll(".active").forEach(el => el.classList.remove("active"));
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tabButton.classList.add("active");
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group.querySelector(`[title="${tabButton.innerHTML}"]`).classList.add("active");
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},
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}
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document.addEventListener("DOMContentLoaded", () => {
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TabContainer.initTabGroups();
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})
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