1.1.0
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using System;
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using System.Linq;
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using System.Windows;
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using System.Windows.Documents;
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using System.Windows.Media;
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using Markdig;
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using Markdig.Extensions.TaskLists;
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using Markdig.Syntax;
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using Markdig.Syntax.Inlines;
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using MdBlock = Markdig.Syntax.Block;
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using MdInline = Markdig.Syntax.Inlines.Inline;
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using WpfBlock = System.Windows.Documents.Block;
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using WpfInline = System.Windows.Documents.Inline;
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using WpfList = System.Windows.Documents.List;
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namespace Kniip.Update;
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/// <summary>Zet markdown (releasenotes) om naar een WPF <see cref="FlowDocument"/>.</summary>
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public static class MarkdownRenderer
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{
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private static readonly MarkdownPipeline Pipeline = new MarkdownPipelineBuilder()
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.UseEmphasisExtras()
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.UseAutoLinks()
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.UseTaskLists()
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.Build();
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private static readonly FontFamily CodeFont = new("Cascadia Mono, Consolas");
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private static readonly Brush CodeBackground = Freeze(new SolidColorBrush(Color.FromRgb(0xF3, 0xF3, 0xF3)));
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private static readonly Brush QuoteBorder = Freeze(new SolidColorBrush(Color.FromRgb(0xD0, 0xD0, 0xD0)));
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private static Brush Accent => Resource("AccentBrush", Brushes.SteelBlue);
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private static Brush Subtle => Resource("SubtleTextBrush", Brushes.Gray);
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public static FlowDocument CreateDocument() => new()
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{
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FontFamily = new FontFamily("Segoe UI"),
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FontSize = 13,
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PagePadding = new Thickness(14, 10, 14, 10),
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TextAlignment = TextAlignment.Left,
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Background = Brushes.White,
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};
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/// <summary>Voegt de blokken van <paramref name="markdown"/> toe; relatieve links wijzen naar <paramref name="baseUri"/>.</summary>
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public static void Append(FlowDocument document, string markdown, Uri? baseUri = null)
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{
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MarkdownDocument parsed = Markdown.Parse(markdown ?? string.Empty, Pipeline);
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foreach (MdBlock block in parsed)
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{
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if (RenderBlock(block, baseUri) is { } rendered)
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{
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document.Blocks.Add(rendered);
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}
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}
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}
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public static Paragraph Heading(string text, double fontSize, Thickness margin) => new(new Run(text))
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{
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FontSize = fontSize,
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FontWeight = FontWeights.SemiBold,
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Margin = margin,
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};
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private static WpfBlock? RenderBlock(MdBlock block, Uri? baseUri)
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{
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switch (block)
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{
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case HeadingBlock heading:
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{
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var paragraph = new Paragraph
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{
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FontSize = heading.Level switch { 1 => 19, 2 => 16.5, 3 => 14.5, _ => 13 },
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FontWeight = FontWeights.SemiBold,
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Margin = new Thickness(0, heading.Level <= 2 ? 12 : 8, 0, 4),
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};
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AddInlines(paragraph.Inlines, heading.Inline, baseUri);
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return paragraph;
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}
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case ParagraphBlock paragraphBlock:
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{
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var paragraph = new Paragraph { Margin = new Thickness(0, 0, 0, 8) };
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AddInlines(paragraph.Inlines, paragraphBlock.Inline, baseUri);
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return paragraph;
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}
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case ListBlock listBlock:
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{
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var list = new WpfList
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{
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MarkerStyle = listBlock.IsOrdered ? TextMarkerStyle.Decimal : TextMarkerStyle.Disc,
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Margin = new Thickness(0, 0, 0, 8),
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Padding = new Thickness(20, 0, 0, 0),
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};
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if (listBlock.IsOrdered && int.TryParse(listBlock.OrderedStart, out int start) && start > 0)
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{
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list.StartIndex = start;
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}
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foreach (ListItemBlock itemBlock in listBlock.OfType<ListItemBlock>())
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{
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var item = new ListItem();
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foreach (MdBlock child in itemBlock)
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{
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if (RenderBlock(child, baseUri) is { } rendered)
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{
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rendered.Margin = new Thickness(0, 0, 0, 2);
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item.Blocks.Add(rendered);
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}
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}
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list.ListItems.Add(item);
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}
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return list;
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}
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case QuoteBlock quote:
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{
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var section = new Section
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{
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BorderBrush = QuoteBorder,
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BorderThickness = new Thickness(3, 0, 0, 0),
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Padding = new Thickness(10, 0, 0, 0),
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Margin = new Thickness(0, 0, 0, 8),
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Foreground = Subtle,
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};
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foreach (MdBlock child in quote)
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{
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if (RenderBlock(child, baseUri) is { } rendered)
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{
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section.Blocks.Add(rendered);
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}
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}
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return section;
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}
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case CodeBlock code:
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{
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var paragraph = new Paragraph
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{
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FontFamily = CodeFont,
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FontSize = 12,
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Background = CodeBackground,
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Padding = new Thickness(8, 6, 8, 6),
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Margin = new Thickness(0, 0, 0, 8),
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};
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string[] lines = code.Lines.ToString().Replace("\r\n", "\n").TrimEnd('\n').Split('\n');
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for (int i = 0; i < lines.Length; i++)
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{
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if (i > 0)
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{
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paragraph.Inlines.Add(new LineBreak());
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}
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paragraph.Inlines.Add(new Run(lines[i]));
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}
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return paragraph;
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}
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case ThematicBreakBlock:
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return new Paragraph
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{
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BorderBrush = QuoteBorder,
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BorderThickness = new Thickness(0, 0, 0, 1),
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FontSize = 1,
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Margin = new Thickness(0, 4, 0, 10),
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};
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case HtmlBlock:
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return null;
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case ContainerBlock container:
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{
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var section = new Section();
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foreach (MdBlock child in container)
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{
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if (RenderBlock(child, baseUri) is { } rendered)
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{
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section.Blocks.Add(rendered);
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}
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}
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return section.Blocks.Count > 0 ? section : null;
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}
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case LeafBlock leaf when leaf.Inline != null:
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{
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var paragraph = new Paragraph { Margin = new Thickness(0, 0, 0, 8) };
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AddInlines(paragraph.Inlines, leaf.Inline, baseUri);
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return paragraph;
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}
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default:
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return null;
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}
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}
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private static void AddInlines(InlineCollection target, ContainerInline? container, Uri? baseUri)
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{
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if (container == null)
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{
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return;
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}
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foreach (MdInline inline in container)
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{
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if (RenderInline(inline, baseUri) is { } rendered)
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{
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target.Add(rendered);
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}
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}
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}
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private static WpfInline? RenderInline(MdInline inline, Uri? baseUri)
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{
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switch (inline)
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{
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case LiteralInline literal:
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return new Run(literal.Content.ToString());
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case CodeInline code:
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return new Run(code.Content)
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{
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FontFamily = CodeFont,
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FontSize = 12,
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Background = CodeBackground,
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};
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case LineBreakInline lineBreak:
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return lineBreak.IsHard ? new LineBreak() : new Run(" ");
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case TaskList task:
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return new Run(task.Checked ? "\u2611 " : "\u2610 ");
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case AutolinkInline autolink:
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return CreateLink(new Span(new Run(autolink.Url)), autolink.IsEmail ? "mailto:" + autolink.Url : autolink.Url, baseUri);
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case LinkInline link:
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{
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var span = new Span();
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AddInlines(span.Inlines, link, baseUri);
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if (span.Inlines.Count == 0)
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{
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span.Inlines.Add(new Run(link.Url ?? string.Empty));
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}
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return CreateLink(span, link.Url, baseUri);
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}
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case EmphasisInline emphasis:
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{
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var span = new Span();
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AddInlines(span.Inlines, emphasis, baseUri);
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if (emphasis.DelimiterChar == '~')
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{
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span.TextDecorations = TextDecorations.Strikethrough;
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}
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else if (emphasis.DelimiterCount >= 2)
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{
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span.FontWeight = FontWeights.SemiBold;
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}
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else
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{
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span.FontStyle = FontStyles.Italic;
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}
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return span;
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}
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case HtmlInline html when html.Tag.StartsWith("<br", StringComparison.OrdinalIgnoreCase):
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return new LineBreak();
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case HtmlEntityInline entity:
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return new Run(entity.Transcoded.ToString());
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case HtmlInline:
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return null;
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case ContainerInline container:
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{
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var span = new Span();
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AddInlines(span.Inlines, container, baseUri);
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return span;
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}
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default:
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return null;
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}
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}
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private static WpfInline CreateLink(Span content, string? url, Uri? baseUri)
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{
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Uri? target = ResolveUrl(url, baseUri);
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if (target == null)
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{
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return content;
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}
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var link = new Hyperlink(content)
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{
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Foreground = Accent,
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ToolTip = target.ToString(),
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NavigateUri = target,
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};
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link.RequestNavigate += (_, e) =>
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{
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OpenUrl(e.Uri);
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e.Handled = true;
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};
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return link;
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}
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private static Uri? ResolveUrl(string? url, Uri? baseUri)
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{
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if (string.IsNullOrWhiteSpace(url))
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{
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return null;
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}
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Uri? uri = Uri.TryCreate(url, UriKind.Absolute, out Uri? absolute) ? absolute
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: baseUri != null && Uri.TryCreate(baseUri, url, out Uri? relative) ? relative
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: null;
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return uri != null && (uri.Scheme == Uri.UriSchemeHttps || uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeMailto)
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? uri
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: null;
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}
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public static void OpenUrl(Uri uri)
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{
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try
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{
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System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(uri.AbsoluteUri) { UseShellExecute = true });
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}
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catch (Exception)
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{
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// Zonder standaardbrowser gebeurt er niets; de link staat in de tooltip.
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}
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}
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private static Brush Resource(string key, Brush fallback) =>
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Application.Current?.TryFindResource(key) as Brush ?? fallback;
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private static Brush Freeze(SolidColorBrush brush)
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{
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brush.Freeze();
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return brush;
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}
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}
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