From 20b612f9e09644b4b42ad1a2fd7fb098eb6cdbc0 Mon Sep 17 00:00:00 2001
From: John Lewin <lewin76@gmail.com>
Date: Sat, 23 Jun 2018 10:24:09 -0700
Subject: [PATCH] Add seemingly functional Markdown link support

- Issue MatterHackers/MCCentral#3726
---
 Submodules/agg-sharp                          |  2 +-
 .../Inlines/AggLinkInlineRenderer.cs          | 42 ++++++++++++++++---
 2 files changed, 37 insertions(+), 7 deletions(-)

diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index b22228763..f38d68ae2 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit b22228763c87cb90dab2055a1f0a42b9f1597fc5
+Subproject commit f38d68ae2c71343c909b43c7a497ed8bf1a7d23a
diff --git a/Utilities/MarkdigAgg/Inlines/AggLinkInlineRenderer.cs b/Utilities/MarkdigAgg/Inlines/AggLinkInlineRenderer.cs
index 1b949f757..5f0c89edb 100644
--- a/Utilities/MarkdigAgg/Inlines/AggLinkInlineRenderer.cs
+++ b/Utilities/MarkdigAgg/Inlines/AggLinkInlineRenderer.cs
@@ -18,14 +18,43 @@ namespace Markdig.Renderers.Agg.Inlines
 {
 	public class TextLinkX : FlowLayoutWidget
 	{
-		public TextLinkX()
+		private LinkInline linkInline;
+
+		public TextLinkX(LinkInline linkInline)
 		{
-			HAnchor = HAnchor.Fit;
-			VAnchor = VAnchor.Fit;
+			this.HAnchor = HAnchor.Fit;
+			this.VAnchor = VAnchor.Fit;
+			this.Cursor = Cursors.Hand;
+			this.linkInline = linkInline;
+
+		}
+
+		public override void OnClick(MouseEventArgs mouseEvent)
+		{
+			if (linkInline.Url.StartsWith("http", StringComparison.OrdinalIgnoreCase))
+			{
+				ApplicationController.Instance.LaunchBrowser(linkInline.Url);
+			}
+			else
+			{
+				// Inline link?
+				Debugger.Break();
+			}
+
+			base.OnClick(mouseEvent);
 		}
 
 		public override void AddChild(GuiWidget childToAdd, int indexInChildrenList = -1)
 		{
+			if (childToAdd is TextWidget textWidget)
+			{
+				// Mark with underline if any character data exists
+				textWidget.Underline = textWidget.Text.Trim().Length > 0;
+			}
+
+			// Allow link parent to own mouse events
+			childToAdd.Selectable = false;
+
 			base.AddChild(childToAdd, indexInChildrenList);
 		}
 	}
@@ -36,8 +65,9 @@ namespace Markdig.Renderers.Agg.Inlines
 
 		public ImageLinkSimpleX(string url)
 		{
-			HAnchor = HAnchor.Fit;
-			VAnchor = VAnchor.Fit;
+			this.HAnchor = HAnchor.Fit;
+			this.VAnchor = VAnchor.Fit;
+			this.Selectable = false;
 
 			var imageBuffer = new ImageBuffer(icon);
 			var imageWidget = new ImageWidget(imageBuffer);
@@ -154,7 +184,7 @@ namespace Markdig.Renderers.Agg.Inlines
 			}
 			else
 			{
-				renderer.Push(new TextLinkX()); // hyperlink);
+				renderer.Push(new TextLinkX(link)); // hyperlink);
 				renderer.WriteChildren(link);
 				renderer.Pop();
 			}