chore(demos): add editor watermark with pdf export example

Telerik.Examples.Mvc/NuGet.config

@@ -4,6 +4,9 @@
         <clear /> <!-- ensure only the sources defined below are used -->
 		<add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
         <add key="Telerik.UI.for.AspNet.Core.Trial.2022.2.510" value=".\\nuget" />
+        <add key="Telerik.Zip.Trial.2021.3.909" value=".\\nuget" />
+        <add key="Telerik.Core.Export.Trial.2021.3.914" value=".\\nuget" />
+        <add key="Telerik.Documents.Fixed.Trial.2021.3.909" value=".\\nuget" />
     </packageSources>
 </configuration> 
 

Telerik.Examples.Mvc/Telerik.Examples.Mvc/Controllers/Editor/WatermarkController.cs

@@ -0,0 +1,114 @@
+using System;
+using System.IO;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Hosting;
+using Telerik.Windows.Documents.Fixed.Model;
+using Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Streaming;
+using Telerik.Windows.Documents.Fixed.Model.Editing;
+using Telerik.Documents.Primitives;
+using Telerik.Windows.Documents.Fixed.Model.ColorSpaces;
+using Kendo.Core.Export;
+
+namespace Telerik.Examples.Mvc.Controllers.Editor
+{
+    public class WatermarkController : Controller
+    {
+        private readonly IWebHostEnvironment _hostingEnvironment;
+
+        public WatermarkController(IWebHostEnvironment webHostEnvironment)
+        {
+            this._hostingEnvironment = webHostEnvironment;
+        }
+        public IActionResult Watermark()
+        {
+            return View();
+        }
+        [HttpPost]
+        public ActionResult Export(EditorExportData data)
+        {
+            string fileDownloadName = data.FileName + ".pdf";
+            string mimeType = "application/pdf";
+
+            var settings = new EditorDocumentsSettings();
+            settings.HtmlImportSettings.LoadImageFromUri += HtmlImportSettings_LoadImageFromUri;
+
+            try
+            {
+                var filestream = EditorExport.Export(data, settings).FileStream;
+
+                RadFixedPage foregroundContentOwner = GenerateForegroundTextContent("CONFIDENTIAL");
+                MemoryStream ms = new MemoryStream();
+                byte[] renderedBytes = null;
+
+                using (PdfFileSource fileSource = new PdfFileSource(filestream))
+                {
+                    using (PdfStreamWriter fileWriter = new PdfStreamWriter(ms, true))
+                    {
+                        foreach (PdfPageSource pageSource in fileSource.Pages)
+                        {
+                            using (PdfPageStreamWriter pageWriter = fileWriter.BeginPage(pageSource.Size, pageSource.Rotation))
+                            {
+                                pageWriter.WriteContent(pageSource);
+
+                                using (pageWriter.SaveContentPosition())
+                                {
+                                    double xCenteringTranslation = (pageSource.Size.Width - foregroundContentOwner.Size.Width) / 2;
+                                    double yCenteringTranslation = (pageSource.Size.Height - foregroundContentOwner.Size.Height) / 2;
+                                    pageWriter.ContentPosition.Translate(xCenteringTranslation, yCenteringTranslation);
+                                    pageWriter.WriteContent(foregroundContentOwner);
+                                }
+                            }
+                        }
+                    }
+                }
+                renderedBytes = ms.ToArray();
+                return File(renderedBytes, mimeType, fileDownloadName);
+            }
+            catch
+            {
+                return RedirectToAction("Error", "Home");
+            }
+        }
+        private void HtmlImportSettings_LoadImageFromUri(object sender, Telerik.Windows.Documents.Flow.FormatProviders.Html.LoadImageFromUriEventArgs e)
+        {
+            var uri = e.Uri;
+            var absoluteUrl = uri.StartsWith("http://") || uri.StartsWith("www.");
+
+            if (!absoluteUrl)
+            {
+                var trimmedUri = uri.Trim().TrimStart(Path.AltDirectorySeparatorChar).Replace("aspnet-core" + Path.AltDirectorySeparatorChar.ToString(), "").Replace('/','\\');
+                var webRootPath = _hostingEnvironment.WebRootPath;
+                var filePath = Path.Combine(webRootPath, trimmedUri);
+
+                using (var fileStream = System.IO.File.OpenRead(filePath))
+                {
+                    using (var memoryStream = new MemoryStream())
+                    {
+                        fileStream.CopyTo(memoryStream);
+                        e.SetImageInfo(memoryStream.ToArray(),"png");
+                    }
+                }
+            }
+        }
+        private static RadFixedPage GenerateForegroundTextContent(string text)
+        {
+            Block block = new Block();
+            block.BackgroundColor = new RgbColor(50, 0, 0, 0);
+            block.GraphicProperties.FillColor = new RgbColor(255, 0, 0);
+            block.TextProperties.FontSize = 120;
+            block.InsertText(text);
+            Size horizontalTextSize = block.Measure();
+            double rotatedTextSquareSize = (horizontalTextSize.Width + horizontalTextSize.Height) / Math.Sqrt(2);
+
+            RadFixedPage foregroundContentOwner = new RadFixedPage();
+            foregroundContentOwner.Size = new Size(rotatedTextSquareSize, rotatedTextSquareSize);
+            FixedContentEditor foregroundEditor = new FixedContentEditor(foregroundContentOwner);
+            foregroundEditor.Position.Translate(horizontalTextSize.Height / Math.Sqrt(2), 0);
+            foregroundEditor.Position.Rotate(45);
+            foregroundEditor.DrawBlock(block);
+
+            return foregroundContentOwner;
+        }
+
+    }
+}

Telerik.Examples.Mvc/Telerik.Examples.Mvc/Telerik.Examples.Mvc.csproj

@@ -21,6 +21,9 @@
     <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.0.0" />
     <PackageReference Include="System.Drawing.Common" Version="5.0.2" />
     <PackageReference Include="Telerik.UI.for.AspNet.Core.Trial" Version="2022.2.510" />
+    <PackageReference Include="Telerik.Zip.Trial" Version="2021.3.909" />
+    <PackageReference Include="Telerik.Documents.Fixed.Trial" Version="2021.3.909" />
+    <PackageReference Include="Telerik.Core.Export.Trial" Version="2021.3.914" />
   </ItemGroup>
 
   <ItemGroup>

Telerik.Examples.Mvc/Telerik.Examples.Mvc/Views/Editor/Watermark.cshtml

@@ -0,0 +1,59 @@
+@{
+    ViewData["Title"] = "Editor Watermark PDF Export";
+}
+
+<h3>@ViewData["Title"]</h3>
+
+@(Html.Kendo().Editor()
+        .Name("editor")
+        .HtmlAttributes(new { style = "height:440px; width: 100%; height:470px", aria_label = "editor" })
+        .Tools(tools => tools
+            .Clear()
+            .ExportAs(export => {
+                export.Add("PDF","pdf");
+            })
+        )
+        .ExportAs(exportAs => exportAs
+            .FileName("Watermark_Example")
+            .Proxy("Export", "Watermark")
+        )
+        .Value(@<text>
+                <br/>
+                <p style="text-align:center;">
+                    <span style="font-family:Verdana, Geneva, sans-serif;font-size:large;">
+                        <strong>One of the Most Beautiful Islands on Earth - Tenerife</strong>
+                    </span>
+                </p>
+                <p>
+                    <span style="font-family:Verdana, Geneva, sans-serif;font-size:medium;">
+                        <strong>Overview</strong>
+                    </span>
+                </p>
+                <p style="font-size: small;">
+                    <strong>Tenerife </strong>is the largest and most populated island of the eight <a href="https://en.wikipedia.org/wiki/Canary_Islands" target="_blank"> Canary Islands</a>. It is also the most populated island of <strong>Spain</strong>, with a land area of 2,034.38 square kilometers(785 sq mi) and 904,713 inhabitants, 43 % of the total population of the <strong>Canary Islands</strong>. The archipelago's beaches, climate, and important natural attractions make it a major tourist destination with over 12 million visitors per year.
+                </p>
+                <br />
+                <img src="@Url.Content("~/shared/editor/tenerife.png")" style="float: right;" alt="" width="350" height="206" />
+                <p>
+                    <span style="font-family:Verdana, Geneva, sans-serif;font-size:medium;">
+                        <strong>Trip Highlights in Tenerife</strong>
+                    </span>
+                </p>
+                <ul>
+                    <li>
+                        <strong style="color: rgb(0,80,5);">Trip to Loro Parque </strong> <br /> Our top tip is to visit the famous <em>Loro Parque</em> or 'Loro Park. It is a 13.5-hectare zoo on the outskirts of Puerto de la Cruz in Tenerife, Spain where it houses an extensive and diverse reserve of animal and plant species.
+                        <br />
+                        <br />
+                    </li>
+                    <li>
+                        <strong><span style="color: rgb(46,125,50);">Whale and Dolphin Watching Tour&nbsp;<br /></span></strong> Another great option is to take boat excursion with almost guaranteed sightings of whales and dolphins. This is a day-long trip that includes lunch, island visits, fishing, and amazing views of ocean sceneries.
+                        <br />
+                        <br />
+                    </li>
+                    <li>
+                        <strong><span style="color: rgb(96,173,94);">Teide National Park Stargazing</span></strong><br />Last, but not least you can take a stargazing trip to Teide National Park, the 3rd best place in the world to view stars and described by NASA as a window to the universe.
+                        <br />
+                    </li>
+                </ul>
+        </text>)
+)