diff --git a/examples/text-selection/css/minimal.css b/examples/text-selection/css/minimal.css new file mode 100644 index 000000000..9a2451ff5 --- /dev/null +++ b/examples/text-selection/css/minimal.css @@ -0,0 +1,57 @@ +body { + font-family: arial, verdana, sans-serif; +} + +.pdf-content { + border: 1px solid #000000; +} + +/* CSS classes used by TextLayerBuilder to style the text layer divs */ + +/* This stuff is important! Otherwise when you select the text, the text in the divs will show up! */ +::selection { background:rgba(0,0,255,0.3); } +::-moz-selection { background:rgba(0,0,255,0.3); } + +.textLayer { + position: absolute; + left: 0; + top: 0; + right: 0; + bottom: 0; + color: #000; + font-family: sans-serif; + overflow: hidden; +} + +.textLayer > div { + color: transparent; + position: absolute; + line-height: 1; + white-space: pre; + cursor: text; +} + +.textLayer .highlight { + margin: -1px; + padding: 1px; + + background-color: rgba(180, 0, 170, 0.2); + border-radius: 4px; +} + +.textLayer .highlight.begin { + border-radius: 4px 0px 0px 4px; +} + +.textLayer .highlight.end { + border-radius: 0px 4px 4px 0px; +} + +.textLayer .highlight.middle { + border-radius: 0px; +} + +.textLayer .highlight.selected { + background-color: rgba(0, 100, 0, 0.2); +} + diff --git a/examples/text-selection/index.html b/examples/text-selection/index.html new file mode 100644 index 000000000..3d158a4f6 --- /dev/null +++ b/examples/text-selection/index.html @@ -0,0 +1,29 @@ + + + Minimal pdf.js text-selection demo + + + + + + + + + + + + + + + + + + This is a minimal pdf.js text-selection demo. The existing minimal-example shows you how to render a PDF, but not + how to enable text-selection. This example shows you how to do both.

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+ + diff --git a/examples/text-selection/js/minimal.js b/examples/text-selection/js/minimal.js new file mode 100644 index 000000000..8ffa5f7e7 --- /dev/null +++ b/examples/text-selection/js/minimal.js @@ -0,0 +1,99 @@ +//Minimal PDF rendering and text-selection example using pdf.js by Vivin Suresh Paliath (http://vivin.net) +//This example uses a built version of pdf.js that contains all modules that it requires. +// +// +//The problem with understanding text selection was that the text selection code has heavily intertwined +//with viewer.html and viewer.js. I have extracted the parts I need out of viewer.js into a separate file +//which contains the bare minimum required to implement text selection. The key component is TextLayerBuilder, +//which is the object that handles the creation of text-selection divs. I have added this code as an external +//resource. +// +//This demo uses a PDF that only has one page. You can render other pages if you wish, but the focus here is +//just to show you how you can render a PDF with text selection. Hence the code only loads up one page. +// +//The CSS used here is also very important since it sets up the CSS for the text layer divs overlays that +//you actually end up selecting. + +window.onload = function () { + + var scale = 1.5; //Set this to whatever you want. This is basically the "zoom" factor for the PDF. + PDFJS.workerSrc = '../../src/worker_loader.js'; + + function loadPdf(pdfPath) { + var pdf = PDFJS.getDocument(pdfPath); + pdf.then(renderPdf); + } + + function renderPdf(pdf) { + pdf.getPage(1).then(renderPage); + } + + function renderPage(page) { + var viewport = page.getViewport(scale); + var $canvas = jQuery(""); + + //Set the canvas height and width to the height and width of the viewport + var canvas = $canvas.get(0); + var context = canvas.getContext("2d"); + canvas.height = viewport.height; + canvas.width = viewport.width; + + //Append the canvas to the pdf container div + var $pdfContainer = jQuery("#pdfContainer"); + $pdfContainer.css("height", canvas.height + "px").css("width", canvas.width + "px"); + $pdfContainer.append($canvas); + + var canvasOffset = $canvas.offset(); + var $textLayerDiv = jQuery("
") + .addClass("textLayer") + .css("height", viewport.height + "px") + .css("width", viewport.width + "px") + .offset({ + top: canvasOffset.top, + left: canvasOffset.left + }); + + //The following few lines of code set up scaling on the context if we are on a HiDPI display + var outputScale = getOutputScale(); + if (outputScale.scaled) { + var cssScale = 'scale(' + (1 / outputScale.sx) + ', ' + + (1 / outputScale.sy) + ')'; + CustomStyle.setProp('transform', canvas, cssScale); + CustomStyle.setProp('transformOrigin', canvas, '0% 0%'); + + if ($textLayerDiv.get(0)) { + CustomStyle.setProp('transform', $textLayerDiv.get(0), cssScale); + CustomStyle.setProp('transformOrigin', $textLayerDiv.get(0), '0% 0%'); + } + } + + context._scaleX = outputScale.sx; + context._scaleY = outputScale.sy; + if (outputScale.scaled) { + context.scale(outputScale.sx, outputScale.sy); + } + + $pdfContainer.append($textLayerDiv); + + page.getTextContent().then(function (textContent) { + + var textLayer = new TextLayerBuilder({ + textLayerDiv: $textLayerDiv.get(0), + pageIndex: 0 + }); + + textLayer.setTextContent(textContent); + + var renderContext = { + canvasContext: context, + viewport: viewport, + textLayer: textLayer + }; + + page.render(renderContext); + }); + } + + loadPdf('pdf/TestDocument.pdf'); +}; + diff --git a/examples/text-selection/pdf/TestDocument.pdf b/examples/text-selection/pdf/TestDocument.pdf new file mode 100644 index 000000000..843fd9d2b Binary files /dev/null and b/examples/text-selection/pdf/TestDocument.pdf differ