From 080f1697e97e13461ec6df4d31c8924d01257a1b Mon Sep 17 00:00:00 2001
From: Roy Ben Shabat <Roy.mail.net@gmail.com>
Date: Tue, 9 Apr 2019 01:47:48 +0300
Subject: MERGE

---
 .../Rendering/VisualLineLinkText.cs                | 114 +++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineLinkText.cs

(limited to 'Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineLinkText.cs')

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineLinkText.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineLinkText.cs
new file mode 100644
index 000000000..57c472641
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineLinkText.cs
@@ -0,0 +1,114 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.TextFormatting;
+using System.Windows.Navigation;
+
+namespace Tango.Scripting.Editors.Rendering
+{
+	/// <summary>
+	/// VisualLineElement that represents a piece of text and is a clickable link.
+	/// </summary>
+	public class VisualLineLinkText : VisualLineText
+	{
+		/// <summary>
+		/// Gets/Sets the URL that is navigated to when the link is clicked.
+		/// </summary>
+		public Uri NavigateUri { get; set; }
+		
+		/// <summary>
+		/// Gets/Sets the window name where the URL will be opened.
+		/// </summary>
+		public string TargetName { get; set; }
+		
+		/// <summary>
+		/// Gets/Sets whether the user needs to press Control to click the link.
+		/// The default value is true.
+		/// </summary>
+		public bool RequireControlModifierForClick { get; set; }
+		
+		/// <summary>
+		/// Creates a visual line text element with the specified length.
+		/// It uses the <see cref="ITextRunConstructionContext.VisualLine"/> and its
+		/// <see cref="VisualLineElement.RelativeTextOffset"/> to find the actual text string.
+		/// </summary>
+		public VisualLineLinkText(VisualLine parentVisualLine, int length) : base(parentVisualLine, length)
+		{
+			this.RequireControlModifierForClick = true;
+		}
+		
+		/// <inheritdoc/>
+		public override TextRun CreateTextRun(int startVisualColumn, ITextRunConstructionContext context)
+		{
+			this.TextRunProperties.SetForegroundBrush(context.TextView.LinkTextForegroundBrush);
+			this.TextRunProperties.SetBackgroundBrush(context.TextView.LinkTextBackgroundBrush);
+			this.TextRunProperties.SetTextDecorations(TextDecorations.Underline);
+			return base.CreateTextRun(startVisualColumn, context);
+		}
+		
+		/// <summary>
+		/// Gets whether the link is currently clickable.
+		/// </summary>
+		/// <remarks>Returns true when control is pressed; or when
+		/// <see cref="RequireControlModifierForClick"/> is disabled.</remarks>
+		protected bool LinkIsClickable()
+		{
+			if (NavigateUri == null)
+				return false;
+			if (RequireControlModifierForClick)
+				return (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control;
+			else
+				return true;
+		}
+		
+		/// <inheritdoc/>
+		protected internal override void OnQueryCursor(QueryCursorEventArgs e)
+		{
+			if (LinkIsClickable()) {
+				e.Handled = true;
+				e.Cursor = Cursors.Hand;
+			}
+		}
+		
+		/// <inheritdoc/>
+		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes",
+		                                                 Justification = "I've seen Process.Start throw undocumented exceptions when the mail client / web browser is installed incorrectly")]
+		protected internal override void OnMouseDown(MouseButtonEventArgs e)
+		{
+			if (e.ChangedButton == MouseButton.Left && !e.Handled && LinkIsClickable()) {
+				RequestNavigateEventArgs args = new RequestNavigateEventArgs(this.NavigateUri, this.TargetName);
+				args.RoutedEvent = Hyperlink.RequestNavigateEvent;
+				FrameworkElement element = e.Source as FrameworkElement;
+				if (element != null) {
+					// allow user code to handle the navigation request
+					element.RaiseEvent(args);
+				}
+				if (!args.Handled) {
+					try {
+						Process.Start(this.NavigateUri.ToString());
+					} catch {
+						// ignore all kinds of errors during web browser start
+					}
+				}
+				e.Handled = true;
+			}
+		}
+		
+		/// <inheritdoc/>
+		protected override VisualLineText CreateInstance(int length)
+		{
+			return new VisualLineLinkText(ParentVisualLine, length) {
+				NavigateUri = this.NavigateUri,
+				TargetName = this.TargetName,
+				RequireControlModifierForClick = this.RequireControlModifierForClick
+			};
+		}
+	}
+}
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