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path: root/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/IBackgroundRenderer.cs
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// 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.Windows.Media;

namespace Tango.Scripting.Editors.Rendering
{
	/// <summary>
	/// Background renderers draw in the background of a known layer.
	/// You can use background renderers to draw non-interactive elements on the TextView
	/// without introducing new UIElements.
	/// </summary>
	public interface IBackgroundRenderer
	{
		/// <summary>
		/// Gets the layer on which this background renderer should draw.
		/// </summary>
		KnownLayer Layer { get; }
		
		/// <summary>
		/// Causes the background renderer to draw.
		/// </summary>
		void Draw(TextView textView, DrawingContext drawingContext);
	}
}
an> int column; TextView textView; public static readonly Color DefaultForeground = Colors.LightGray; public ColumnRulerRenderer(TextView textView) { if (textView == null) throw new ArgumentNullException("textView"); this.pen = new Pen(new SolidColorBrush(DefaultForeground), 1); this.pen.Freeze(); this.textView = textView; this.textView.BackgroundRenderers.Add(this); } public KnownLayer Layer { get { return KnownLayer.Background; } } public void SetRuler(int column, Pen pen) { if (this.column != column) { this.column = column; textView.InvalidateLayer(this.Layer); } if (this.pen != pen) { this.pen = pen; textView.InvalidateLayer(this.Layer); } } public void Draw(TextView textView, System.Windows.Media.DrawingContext drawingContext) { if (column < 1) return; double offset = textView.WideSpaceWidth * column; Size pixelSize = PixelSnapHelpers.GetPixelSize(textView); double markerXPos = PixelSnapHelpers.PixelAlign(offset, pixelSize.Width); markerXPos -= textView.ScrollOffset.X; Point start = new Point(markerXPos, 0); Point end = new Point(markerXPos, Math.Max(textView.DocumentHeight, textView.ActualHeight)); drawingContext.DrawLine(pen, start, end); } } }