Embed custom colour palettes

Clippit.Tests/PowerPoint/PtUtilTests.cs

@@ -2,6 +2,9 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 using System.IO;
+using System.Linq;
+using Clippit.PowerPoint;
+using DocumentFormat.OpenXml.Packaging;
 using Xunit;
 
 #if !ELIDE_XUNIT_TESTS
@@ -10,6 +13,10 @@ namespace Clippit.Tests.PowerPoint
 {
     public class PtUtilTests
     {
+        public static string SourceDirectory = "../../../../TestFiles/PublishSlides/";
+        public static string TargetDirectory = "../../../../TestFiles/PublishSlides/output";
+        private static string customColorsFilePath = "../../../../TestFiles/PublishSlides/custom_colors.xml";
+
         [Theory]
         [InlineData("PU/PU001-Test001.mht")]
         public void PU001(string name)
@@ -22,8 +29,20 @@ public void PU001(string name)
             Assert.True(p.MimeVersion != null);
             Assert.True(p.Parts.Length != 0);
             Assert.DoesNotContain(p.Parts, part => part.ContentType == null || part.ContentLocation == null);
-        }
+        } 
+
+        [Theory]
+        [InlineData("EPAM_AccountStory.pptx")]
+        public void AddCustomColorsToPresentation(string fileName)
+        {
+            var file = Path.Combine(SourceDirectory, fileName);
+            var document = new PmlDocument(file);
+
+            // Load custom colors from XML file
+            var customColors = PresentationBuilder.LoadCustomColors(customColorsFilePath);
 
+            PresentationBuilder.ModifyPresentationWithCustomColors(file, customColors);
+        }
     }
 }
 

Clippit/PowerPoint/PresentationBuilder.cs

@@ -5,6 +5,8 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
+using System.Xml.Linq;
+using DocumentFormat.OpenXml.Drawing;
 using DocumentFormat.OpenXml.Packaging;
 
 namespace Clippit.PowerPoint
@@ -128,7 +130,49 @@ private static void ExtractSlide(PresentationDocument srcDoc, int slideNumber, P
                 throw;
             }
         }
-
+
+        public static void ModifyPresentationWithCustomColors(string presentationFilePath, IEnumerable<XElement> customColors)
+        {
+            using (PresentationDocument presentationDocument = PresentationDocument.Open(presentationFilePath, true))
+            {
+                var presentationPart = presentationDocument.PresentationPart;
+                var slideMasterPart = presentationPart.SlideMasterParts.First();
+                var themePart = slideMasterPart.ThemePart;
+                var theme = themePart.Theme;
+                ModifyCustomColors(theme, customColors);
+
+                // Save the changes
+                themePart.Theme.Save();
+            }
+        }
+        public static void ModifyCustomColors(Theme theme, IEnumerable<XElement> colors)
+        {
+            var customColors = new List<CustomColor>();
+            XNamespace ns = "http://schemas.openxmlformats.org/drawingml/2006/main";
+            foreach (var color in colors)
+            {
+                customColors.Add(new CustomColor(
+                    new RgbColorModelHex()
+                    {
+                        Val = color.Element(ns + "srgbClr")
+                            .Attribute("val").Value
+                    }
+                )
+                {
+                    Name = color.Attribute("name").Value
+                });
+            }
+            theme.CustomColorList = new CustomColorList(customColors);
+        }
+
+        public static IEnumerable<XElement> LoadCustomColors(string filePath)
+        {
+            var doc = XDocument.Load(filePath);
+            XNamespace a = "http://schemas.openxmlformats.org/drawingml/2006/main";
+
+            return doc.Root.Elements(A.custClrLst).Elements(A.custClr);
+        }
+
         private static void BuildPresentation(List<SlideSource> sources, PresentationDocument output)
         {
             using var fluentBuilder = new FluentPresentationBuilder(output);