// 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