Parse epub CSS

2025-09-13 11:09:06 +00:00 · 2018-07-16 12:13:40 +02:00
parent 917c3c0bb8
commit 02911d9550
4 changed files with 96 additions and 33 deletions
--- a/QuickLook.Plugin/QuickLook.Plugin.EpubViewer/BookHtmlContent.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.EpubViewer/BookHtmlContent.cs
@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Media.Imaging;
+using TheArtOfDev.HtmlRenderer.Core.Entities;
+using TheArtOfDev.HtmlRenderer.WPF;
+using VersOne.Epub;
+
+namespace QuickLook.Plugin.EpubViewer
+{
+    public class BookHtmlContent : HtmlPanel
+    {
+        public static readonly DependencyProperty ChapterRefProperty = DependencyProperty.Register("ChapterRef", typeof(EpubChapterRef), typeof(BookHtmlContent), new PropertyMetadata(OnChapterRefChanged));
+
+        public EpubChapterRef ChapterRef
+        {
+            get { return (EpubChapterRef)GetValue(ChapterRefProperty); }
+            set { SetValue(ChapterRefProperty, value); }
+        }
+
+        public static readonly DependencyProperty EpubBookProperty = DependencyProperty.Register("EpubBook", typeof(EpubBookRef), typeof(BookHtmlContent), new PropertyMetadata(null));
+
+        public EpubBookRef EpubBook
+        {
+            get { return (EpubBookRef)GetValue(EpubBookProperty); }
+            set { SetValue(EpubBookProperty, value); }
+        }
+
+        protected override void OnStylesheetLoad(HtmlStylesheetLoadEventArgs args)
+        {
+            string styleSheetFilePath = GetFullPath(ChapterRef.ContentFileName, args.Src);
+            if (EpubBook.Content.Css.TryGetValue(styleSheetFilePath, out EpubTextContentFileRef styleSheetContent))
+            {
+                args.SetStyleSheet = styleSheetContent.ReadContentAsText();
+            }
+        }
+
+        protected override async void OnImageLoad(HtmlImageLoadEventArgs args)
+        {
+            string imageFilePath = GetFullPath(ChapterRef.ContentFileName, args.Src);
+            if (EpubBook.Content.Images.TryGetValue(imageFilePath, out EpubByteContentFileRef imageContent))
+            {
+                using (MemoryStream imageStream = new MemoryStream(await imageContent.ReadContentAsBytesAsync()))
+                {
+                    BitmapImage bitmapImage = new BitmapImage();
+                    bitmapImage.BeginInit();
+                    bitmapImage.StreamSource = imageStream;
+                    bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
+                    bitmapImage.EndInit();
+                    bitmapImage.Freeze();
+                    args.Callback(bitmapImage);
+                }
+                args.Handled = true;
+            }
+        }
+
+        private string GetFullPath(string htmlFilePath, string relativePath)
+        {
+            if (relativePath.StartsWith("/"))
+            {
+                return relativePath.Length > 1 ? relativePath.Substring(1) : String.Empty;
+            }
+            string basePath = System.IO.Path.GetDirectoryName(htmlFilePath);
+            while (relativePath.StartsWith("../"))
+            {
+                relativePath = relativePath.Length > 3 ? relativePath.Substring(3) : String.Empty;
+                basePath = System.IO.Path.GetDirectoryName(basePath);
+            }
+            string fullPath = String.Concat(basePath.Replace('\\', '/'), '/', relativePath);
+            return fullPath.Length > 1 ? fullPath.Substring(1) : String.Empty;
+        }
+
+        private static async void OnChapterRefChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
+        {
+            BookHtmlContent bookHtmlContent = dependencyObject as BookHtmlContent;
+            if (bookHtmlContent == null || bookHtmlContent.ChapterRef == null)
+            {
+                return;
+            }
+            bookHtmlContent.Text = await bookHtmlContent.ChapterRef.ReadHtmlContentAsync();
+        }
+    }
+}