Mono.TextEditor.TextViewMargin.OptionsChanged C# (CSharp) Method

		protected internal override void OptionsChanged ()
		{
			DisposeGCs ();
			selectionColor = null;
			currentLineColor = null;
		
			var markerFont = textEditor.Options.Font.Copy ();
			markerFont.Size = markerFont.Size * 8 / 10;
			markerLayout.FontDescription = markerFont;
			markerLayout.FontDescription.Weight = Pango.Weight.Normal;
			markerLayout.FontDescription.Style = Pango.Style.Normal;

			defaultLayout.FontDescription = textEditor.Options.Font;
			using (var metrics = textEditor.PangoContext.GetMetrics (textEditor.Options.Font, textEditor.PangoContext.Language)) {
				this.textEditor.GetTextEditorData ().LineHeight = System.Math.Ceiling (0.5 + (metrics.Ascent + metrics.Descent) / Pango.Scale.PangoScale);
				this.charWidth = metrics.ApproximateCharWidth / Pango.Scale.PangoScale;
			}

			// Gutter font may be bigger
			using (var metrics = textEditor.PangoContext.GetMetrics (textEditor.Options.GutterFont, textEditor.PangoContext.Language)) {
				this.textEditor.GetTextEditorData ().LineHeight = System.Math.Max (this.textEditor.GetTextEditorData ().LineHeight, System.Math.Ceiling (0.5 + (metrics.Ascent + metrics.Descent) / Pango.Scale.PangoScale));
			}

			textEditor.LineHeight = System.Math.Max (1, LineHeight);

			if (eolMarkerLayout == null) {
				eolMarkerLayout = new Pango.Layout[markerTexts.Length];
				eolMarkerLayoutRect = new Pango.Rectangle[markerTexts.Length];
				for (int i = 0; i < eolMarkerLayout.Length; i++)
					eolMarkerLayout[i] = PangoUtil.CreateLayout (textEditor);
			}

			var font = textEditor.Options.Font.Copy ();
			font.Size = font.Size * 3 / 4;

			Pango.Rectangle logRect;
			for (int i = 0; i < eolMarkerLayout.Length; i++) {
				var layout = eolMarkerLayout [i];
				layout.FontDescription = font;

				layout.SetText (markerTexts [i]);
				
				Pango.Rectangle tRect;
				layout.GetPixelExtents (out logRect, out tRect);
				eolMarkerLayoutRect [i] = tRect;
			}

			if (tabArray != null) {
				tabArray.Dispose ();
				tabArray = null;
			}

			var tabWidthLayout = PangoUtil.CreateLayout (textEditor, (new string (' ', textEditor.Options.TabSize)));
			tabWidthLayout.Alignment = Pango.Alignment.Left;
			tabWidthLayout.FontDescription = textEditor.Options.Font;
			int tabWidth, h;
			tabWidthLayout.GetSize (out tabWidth, out h);
			tabWidthLayout.Dispose ();
			tabArray = new Pango.TabArray (1, false);
			tabArray.SetTab (0, Pango.TabAlign.Left, tabWidth);

			textEditor.UpdatePreeditLineHeight ();

			DisposeLayoutDict ();
			chunkDict.Clear ();
			caretX = caretY = -LineHeight;
		}