Line Numbers for RichText Control in C#

from: http://www.codeproject.com/Articles/38858/Line-Numbers-for-RichText-Control-in-C

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using Microsoft.VisualBasic; using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Drawing; using System.Drawing.Drawing2D; using System.Diagnostics; using System.Windows.Forms;     namespace LineNumbers {     /// <summary>     /// http://www.codeproject.com/Articles/38858/Line-Numbers-for-RichText-Control-in-C     /// </summary>     [System.ComponentModel.DefaultProperty("ParentRichTextBox")]     public class LineNumbers_For_RichTextBox : System.Windows.Forms.Control     {           private class LineNumberItem         {             internal int LineNumber;             internal Rectangle Rectangle;             internal LineNumberItem(int zLineNumber, Rectangle zRectangle)             {                 this.LineNumber = zLineNumber;                 this.Rectangle = zRectangle;             }         }           public enum LineNumberDockSide : byte         {             None = 0,             Left = 1,             Right = 2,             Height = 4         }         private RichTextBox withEventsField_zParent = null;           private RichTextBox zParent {             get { return withEventsField_zParent; }             set {                 if (withEventsField_zParent != null) {                     withEventsField_zParent.LocationChanged -= zParent_Changed;                     withEventsField_zParent.Move -= zParent_Changed;                     withEventsField_zParent.Resize -= zParent_Changed;                     withEventsField_zParent.DockChanged -= zParent_Changed;                     withEventsField_zParent.TextChanged -= zParent_Changed;                     withEventsField_zParent.MultilineChanged -= zParent_Changed;                     withEventsField_zParent.HScroll -= zParent_Scroll;                     withEventsField_zParent.VScroll -= zParent_Scroll;                     withEventsField_zParent.ContentsResized -= zParent_ContentsResized;                     withEventsField_zParent.Disposed -= zParent_Disposed;                 }                 withEventsField_zParent = value;                 if (withEventsField_zParent != null) {                     withEventsField_zParent.LocationChanged += zParent_Changed;                     withEventsField_zParent.Move += zParent_Changed;                     withEventsField_zParent.Resize += zParent_Changed;                     withEventsField_zParent.DockChanged += zParent_Changed;                     withEventsField_zParent.TextChanged += zParent_Changed;                     withEventsField_zParent.MultilineChanged += zParent_Changed;                     withEventsField_zParent.HScroll += zParent_Scroll;                     withEventsField_zParent.VScroll += zParent_Scroll;                     withEventsField_zParent.ContentsResized += zParent_ContentsResized;                     withEventsField_zParent.Disposed += zParent_Disposed;                 }             }         }                   //private Windows.Forms.Timer withEventsField_zTimer = new Windows.Forms.Timer();         //private Windows.Forms.Timer zTimer {         //private Timer withEventsField_zTimer = new Windows.Forms.Timer();         private Timer withEventsField_zTimer = new Timer();         private Timer zTimer         {             get { return withEventsField_zTimer; }             set {                 if (withEventsField_zTimer != null) {                     withEventsField_zTimer.Tick -= zTimer_Tick;                 }                 withEventsField_zTimer = value;                 if (withEventsField_zTimer != null) {                     withEventsField_zTimer.Tick += zTimer_Tick;                 }             }           }         private bool zAutoSizing = true;         private Size zAutoSizing_Size = new Size(0, 0);         //private Rectangle zContentRectangle = null;         private Rectangle zContentRectangle;         private LineNumberDockSide zDockSide = LineNumberDockSide.Left;         private bool zParentIsScrolling = false;           private bool zSeeThroughMode = false;         private bool zGradient_Show = true;         private System.Drawing.Drawing2D.LinearGradientMode zGradient_Direction = System.Drawing.Drawing2D.LinearGradientMode.Horizontal;         private Color zGradient_StartColor = Color.FromArgb(0, 0, 0, 0);           private Color zGradient_EndColor = Color.LightSteelBlue;         private bool zGridLines_Show = true;         private float zGridLines_Thickness = 1;         private System.Drawing.Drawing2D.DashStyle zGridLines_Style = System.Drawing.Drawing2D.DashStyle.Dot;           private Color zGridLines_Color = Color.SlateGray;         private bool zBorderLines_Show = true;         private float zBorderLines_Thickness = 1;         private System.Drawing.Drawing2D.DashStyle zBorderLines_Style = System.Drawing.Drawing2D.DashStyle.Dot;           private Color zBorderLines_Color = Color.SlateGray;         private bool zMarginLines_Show = true;         private LineNumberDockSide zMarginLines_Side = LineNumberDockSide.Right;         private float zMarginLines_Thickness = 1;         private System.Drawing.Drawing2D.DashStyle zMarginLines_Style = System.Drawing.Drawing2D.DashStyle.Solid;           private Color zMarginLines_Color = Color.SlateGray;         private bool zLineNumbers_Show = true;         private bool zLineNumbers_ShowLeadingZeroes = true;         private bool zLineNumbers_ShowAsHexadecimal = false;         private bool zLineNumbers_ClipByItemRectangle = true;         private Size zLineNumbers_Offset = new Size(0, 0);         private string zLineNumbers_Format = "0";         private System.Drawing.ContentAlignment zLineNumbers_Alignment = ContentAlignment.TopRight;                   private bool zLineNumbers_AntiAlias = true;           private List<LineNumberItem> zLNIs = new List<LineNumberItem>();         private Point zPointInParent = new Point(0, 0);         private Point zPointInMe = new Point(0, 0);         private int zParentInMe = 0;         ////////////////////////////////////////////////////////////////////////////////////////////////////           public LineNumbers_For_RichTextBox()         {             {                 this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);                 this.SetStyle(ControlStyles.ResizeRedraw, true);                 this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);                 this.SetStyle(ControlStyles.UserPaint, true);                 this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);                 this.Margin = new Padding(0);                 this.Padding = new Padding(0, 0, 2, 0);             }             {                 zTimer.Enabled = true;                 zTimer.Interval = 200;                 zTimer.Stop();             }             this.Update_SizeAndPosition();             this.Invalidate();         }           protected override void OnHandleCreated(System.EventArgs e)         {             base.OnHandleCreated(e);             this.AutoSize = false;         }             ////////////////////////////////////////////////////////////////////////////////////////////////////           [System.ComponentModel.Browsable(false)]         public override bool AutoSize {             get { return base.AutoSize; }             set {                 base.AutoSize = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this property to automatically resize the control (and reposition it if needed).")]         [System.ComponentModel.Category("Additional Behavior")]         public bool AutoSizing {             get { return zAutoSizing; }             set {                 zAutoSizing = value;                 this.Refresh();                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this property to enable LineNumbers for the chosen RichTextBox.")]         [System.ComponentModel.Category("Add LineNumbers to")]         public RichTextBox ParentRichTextBox {             get { return zParent; }             set {                 zParent = value;                 if (zParent != null) {                     this.Parent = zParent.Parent;                     zParent.Refresh();                 }                 this.Text = "";                 this.Refresh();                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this property to dock the LineNumbers to a chosen side of the chosen RichTextBox.")]         [System.ComponentModel.Category("Additional Behavior")]         public LineNumberDockSide DockSide {             get { return zDockSide; }             set {                 zDockSide = value;                 this.Refresh();                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this property to enable the control to act as an overlay ontop of the RichTextBox.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool _SeeThroughMode_ {             get { return zSeeThroughMode; }             set {                 zSeeThroughMode = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("BorderLines are shown on all sides of the LineNumber control.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool Show_BorderLines {             get { return zBorderLines_Show; }             set {                 zBorderLines_Show = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public Color BorderLines_Color {             get { return zBorderLines_Color; }             set {                 zBorderLines_Color = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public float BorderLines_Thickness {             get { return zBorderLines_Thickness; }             set {                 zBorderLines_Thickness = Math.Max(1, Math.Min(255, value));                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public System.Drawing.Drawing2D.DashStyle BorderLines_Style         {             get { return zBorderLines_Style; }             set {                 if (value == System.Drawing.Drawing2D.DashStyle.Custom)                     value = System.Drawing.Drawing2D.DashStyle.Solid;                 zBorderLines_Style = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("GridLines are the horizontal divider-lines shown above each LineNumber.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool Show_GridLines {             get { return zGridLines_Show; }             set {                 zGridLines_Show = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public Color GridLines_Color {             get { return zGridLines_Color; }             set {                 zGridLines_Color = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public float GridLines_Thickness {             get { return zGridLines_Thickness; }             set {                 zGridLines_Thickness = Math.Max(1, Math.Min(255, value));                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public System.Drawing.Drawing2D.DashStyle GridLines_Style         {             get { return zGridLines_Style; }             set {                 if (value == System.Drawing.Drawing2D.DashStyle.Custom)                     value = System.Drawing.Drawing2D.DashStyle.Solid;                 zGridLines_Style = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("MarginLines are shown on the Left or Right (or both in Height-mode) of the LineNumber control.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool Show_MarginLines {             get { return zMarginLines_Show; }             set {                 zMarginLines_Show = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public LineNumberDockSide MarginLines_Side {             get { return zMarginLines_Side; }             set {                 zMarginLines_Side = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public Color MarginLines_Color {             get { return zMarginLines_Color; }             set {                 zMarginLines_Color = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public float MarginLines_Thickness {             get { return zMarginLines_Thickness; }             set {                 zMarginLines_Thickness = Math.Max(1, Math.Min(255, value));                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public System.Drawing.Drawing2D.DashStyle MarginLines_Style         {             get { return zMarginLines_Style; }             set {                 if (value == System.Drawing.Drawing2D.DashStyle.Custom)                     value = System.Drawing.Drawing2D.DashStyle.Solid;                 zMarginLines_Style = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("The BackgroundGradient is a gradual blend of two colors, shown in the back of each LineNumber's item-area.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool Show_BackgroundGradient {             get { return zGradient_Show; }             set {                 zGradient_Show = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public Color BackgroundGradient_AlphaColor {             get { return zGradient_StartColor; }             set {                 zGradient_StartColor = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public Color BackgroundGradient_BetaColor {             get { return zGradient_EndColor; }             set {                 zGradient_EndColor = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Appearance")]         public System.Drawing.Drawing2D.LinearGradientMode BackgroundGradient_Direction         {             get { return zGradient_Direction; }             set {                 zGradient_Direction = value;                 this.Invalidate();             }         }           [System.ComponentModel.Category("Additional Behavior")]         public bool Show_LineNrs {             get { return zLineNumbers_Show; }             set {                 zLineNumbers_Show = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this to set whether the LineNumbers are allowed to spill out of their item-area, or should be clipped by it.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool LineNrs_ClippedByItemRectangle {             get { return zLineNumbers_ClipByItemRectangle; }             set {                 zLineNumbers_ClipByItemRectangle = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this to set whether the LineNumbers should have leading zeroes (based on the total amount of textlines).")]         [System.ComponentModel.Category("Additional Behavior")]         public bool LineNrs_LeadingZeroes {             get { return zLineNumbers_ShowLeadingZeroes; }             set {                 zLineNumbers_ShowLeadingZeroes = value;                 this.Refresh();                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this to set whether the LineNumbers should be shown as hexadecimal values.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool LineNrs_AsHexadecimal {             get { return zLineNumbers_ShowAsHexadecimal; }             set {                 zLineNumbers_ShowAsHexadecimal = value;                 this.Refresh();                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this property to manually reposition the LineNumbers, relative to their current location.")]         [System.ComponentModel.Category("Additional Behavior")]         public Size LineNrs_Offset {             get { return zLineNumbers_Offset; }             set {                 zLineNumbers_Offset = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this to align the LineNumbers to a chosen corner (or center) within their item-area.")]         [System.ComponentModel.Category("Additional Behavior")]         public System.Drawing.ContentAlignment LineNrs_Alignment {             get { return zLineNumbers_Alignment; }             set {                 zLineNumbers_Alignment = value;                 this.Invalidate();             }         }           [System.ComponentModel.Description("Use this to apply Anti-Aliasing to the LineNumbers (high quality). Some fonts will look better without it, though.")]         [System.ComponentModel.Category("Additional Behavior")]         public bool LineNrs_AntiAlias {             get { return zLineNumbers_AntiAlias; }             set {                 zLineNumbers_AntiAlias = value;                 this.Refresh();                 this.Invalidate();             }         }           [System.ComponentModel.Browsable(true)]         public override System.Drawing.Font Font {             get { return base.Font; }             set {                 base.Font = value;                 this.Refresh();                 this.Invalidate();             }         }           [System.ComponentModel.DefaultValue("")]         [System.ComponentModel.AmbientValue("")]         [System.ComponentModel.Browsable(false)]         public override string Text {             get { return base.Text; }             set {                 base.Text = "";                 this.Invalidate();             }         }             ////////////////////////////////////////////////////////////////////////////////////////////////////           protected override void OnSizeChanged(System.EventArgs e)         {             if (this.DesignMode == true)                 this.Refresh();             base.OnSizeChanged(e);             this.Invalidate();         }           protected override void OnLocationChanged(System.EventArgs e)         {             if (this.DesignMode == true)                 this.Refresh();             base.OnLocationChanged(e);             this.Invalidate();         }           public override void Refresh()         {             //   Note: don't change the order here, first the Mybase.Refresh, then the Update_SizeAndPosition.             base.Refresh();             this.Update_SizeAndPosition();         }           /// <summary>         /// This Sub will run whenever Me.Refresh() is called. It applies the AutoSizing and DockSide settings.         /// </summary>         /// <remarks></remarks>         private void Update_SizeAndPosition()         {             if (this.AutoSize == true)                 return;             if (this.Dock == DockStyle.Bottom | this.Dock == DockStyle.Fill | this.Dock == DockStyle.Top)                 return;             Point zNewLocation = this.Location;             Size zNewSize = this.Size;               if (zAutoSizing == true) {                 //switch (true) {                 //  case zParent == null:                 if (zParent == null ){                         // --- ReminderMessage sizing                         if (zAutoSizing_Size.Width > 0)                             zNewSize.Width = zAutoSizing_Size.Width;                         if (zAutoSizing_Size.Height > 0)                             zNewSize.Height = zAutoSizing_Size.Height;                         this.Size = zNewSize;                           // break;                 }else if (this.Dock == DockStyle.Left | this.Dock == DockStyle.Right){                     //--- zParent isNot Nothing for the following cases                     //case this.Dock == DockStyle.Left | this.Dock == DockStyle.Right:                         if (zAutoSizing_Size.Width > 0)                             zNewSize.Width = zAutoSizing_Size.Width;                         this.Width = zNewSize.Width;                           //break;                 }else if (zDockSide != LineNumberDockSide.None){                     // --- DockSide is active L/R/H                     //case zDockSide != LineNumberDockSide.None:                         if (zAutoSizing_Size.Width > 0)                             zNewSize.Width = zAutoSizing_Size.Width;                         zNewSize.Height = zParent.Height;                         if (zDockSide == LineNumberDockSide.Left)                             zNewLocation.X = zParent.Left - zNewSize.Width - 1;                         if (zDockSide == LineNumberDockSide.Right)                             zNewLocation.X = zParent.Right + 1;                         zNewLocation.Y = zParent.Top;                         this.Location = zNewLocation;                         this.Size = zNewSize;                           //break;                 } else if (zDockSide == LineNumberDockSide.None) {                     // --- DockSide = None, but AutoSizing is still setting the Width                     //case zDockSide == LineNumberDockSide.None:                         if (zAutoSizing_Size.Width > 0)                             zNewSize.Width = zAutoSizing_Size.Width;                         this.Size = zNewSize;                           //break;                 }               } else {                 // --- No AutoSizing                 //switch (true) {                 if (zParent == null){                     //case zParent == null:                         // --- ReminderMessage sizing                         if (zAutoSizing_Size.Width > 0)                             zNewSize.Width = zAutoSizing_Size.Width;                         if (zAutoSizing_Size.Height > 0)                             zNewSize.Height = zAutoSizing_Size.Height;                         this.Size = zNewSize;                           //break;                 }else if (zDockSide != LineNumberDockSide.None){                     // --- No AutoSizing, but DockSide L/R/H is active so height and position need updates.                     //case zDockSide != LineNumberDockSide.None:                         zNewSize.Height = zParent.Height;                         if (zDockSide == LineNumberDockSide.Left)                             zNewLocation.X = zParent.Left - zNewSize.Width - 1;                         if (zDockSide == LineNumberDockSide.Right)                             zNewLocation.X = zParent.Right + 1;                         zNewLocation.Y = zParent.Top;                         this.Location = zNewLocation;                         this.Size = zNewSize;                           //break;                 }             }           }             /// <summary>         /// This Sub determines which textlines are visible in the ParentRichTextBox, and makes LineNumberItems (LineNumber + ItemRectangle)         /// for each visible line. They are put into the zLNIs List that will be used by the OnPaint event to draw the LineNumberItems.         /// </summary>         /// <remarks></remarks>         private void Update_VisibleLineNumberItems()         {               // ################             int tmpY;             // ###############             zLNIs.Clear();             zAutoSizing_Size = new Size(0, 0);             zLineNumbers_Format = "0";             //initial setting             //   To measure the LineNumber's width, its Format 0 is replaced by w as that is likely to be one of the widest characters in non-monospace fonts.             if (zAutoSizing == true)                 zAutoSizing_Size = new Size(TextRenderer.MeasureText(zLineNumbers_Format.Replace('0', 'W'), this.Font).Width, 0);                 //zAutoSizing_Size = new Size(TextRenderer.MeasureText(zLineNumbers_Format.Replace("0".ToCharArray(), "W".ToCharArray()), this.Font).Width, 0);               if (zParent == null || string.IsNullOrEmpty(zParent.Text))                 return;               // --- Make sure the LineNumbers are aligning to the same height as the zParent textlines by converting to screencoordinates             //   and using that as an offset that gets added to the points for the LineNumberItems             zPointInParent = zParent.PointToScreen(zParent.ClientRectangle.Location);             zPointInMe = this.PointToScreen(new Point(0, 0));             //   zParentInMe is the vertical offset to make the LineNumberItems line up with the textlines in zParent.             zParentInMe = zPointInParent.Y - zPointInMe.Y + 1;             //   The first visible LineNumber may not be the first visible line of text in the RTB if the LineNumbercontrol's .Top is lower on the form than             //   the .Top of the parent RichTextBox. Therefor, zPointInParent will now be used to find zPointInMe's equivalent height in zParent,             //   which is needed to find the best StartIndex later on.             zPointInParent = zParent.PointToClient(zPointInMe);               // --- NOTES:             //   Additional complication is the fact that when wordwrap is enabled on the RTB, the wordwrapped text spills into the RTB.Lines collection,             //   so we need to split the text into lines ourselves, and use the Index of each zSplit-line's first character instead of the RTB's.             string[] zSplit = zParent.Text.Split(Constants.vbCrLf.ToCharArray());               if (zSplit.Length < 2) {                 //   Just one line in the text = one linenumber                 //   NOTE:  zContentRectangle is built by the zParent.ContentsResized event.                 Point zPoint = zParent.GetPositionFromCharIndex(0);                 zLNIs.Add(new LineNumberItem(1, new Rectangle(new Point(0, zPoint.Y - 1 + zParentInMe), new Size(this.Width, zContentRectangle.Height - zPoint.Y))));                 } else {                 //   Multiple lines, but store only those LineNumberItems for lines that are visible.                 TimeSpan zTimeSpan = new TimeSpan(DateAndTime.Now.Ticks);                 Point zPoint = new Point(0, 0);                 int zStartIndex = 0;                 int zSplitStartLine = 0;                 int zA = zParent.Text.Length - 1;                 // #########################                                           //this.FindStartIndex(ref zStartIndex, ref zA, ref zPointInParent.Y);                     tmpY = zPointInParent.Y;                     this.FindStartIndex(ref zStartIndex, ref zA, ref tmpY);                     zPointInParent.Y = tmpY;                   // ################                     //   zStartIndex now holds the index of a character in the first visible line from zParent.Text                 //   Now it will be pointed at the first character of that line (chr(10) = Linefeed part of the vbCrLf constant)                 zStartIndex = Math.Max(0, Math.Min(zParent.Text.Length - 1, zParent.Text.Substring(0, zStartIndex).LastIndexOf(Strings.Chr(10)) + 1));                   //   We now need to find out which zSplit-line that character is in, by counting the vbCrlf appearances that come before it.                 zSplitStartLine = Math.Max(0, zParent.Text.Substring(0, zStartIndex).Split(Constants.vbCrLf.ToCharArray()).Length - 1);                   //   zStartIndex starts off pointing at the first character of the first visible line, and will be then be pointed to                 //   the index of the first character on the next line.                 for (zA = zSplitStartLine; zA <= zSplit.Length - 1; zA++) {                     zPoint = zParent.GetPositionFromCharIndex(zStartIndex);                     zStartIndex += Math.Max(1, zSplit[zA].Length + 1);                     if (zPoint.Y + zParentInMe > this.Height)                         break; // TODO: might not be correct. Was : Exit For                     //   For performance reasons, the list of LineNumberItems (zLNIs) is first built with only the location of its                     //   itemrectangle being used. The height of those rectangles will be computed afterwards by comparing the items' Y coordinates.                     zLNIs.Add(new LineNumberItem(zA + 1, new Rectangle(0, zPoint.Y - 1 + zParentInMe, this.Width, 1)));                     if (zParentIsScrolling == true && DateAndTime.Now.Ticks > zTimeSpan.Ticks + 500000) {                         //   The more lines there are in the RTB, the slower the RTB's .GetPositionFromCharIndex() method becomes                         //   To avoid those delays from interfering with the scrollingspeed, this speedbased exit for is applied (0.05 sec)                         //   zLNIs will have at least 1 item, and if that's the only one, then change its location to 0,0 to make it readable                         if (zLNIs.Count == 1)                             zLNIs[0].Rectangle.Y = 0;                             // zLNIs(0).Rectangle.Y = 0;                           zParentIsScrolling = false;                         zTimer.Start();                         break; // TODO: might not be correct. Was : Exit For                     }                 }                   if (zLNIs.Count == 0)                     return;                   //   Add an extra placeholder item to the end, to make the heightcomputation easier                 if (zA < zSplit.Length) {                     //   getting here means the for/next loop was exited before reaching the last zSplit textline                     //   zStartIndex will still be pointing to the startcharacter of the next line, so we can use that:                     zPoint = zParent.GetPositionFromCharIndex(Math.Min(zStartIndex, zParent.Text.Length - 1));                     zLNIs.Add(new LineNumberItem(-1, new Rectangle(0, zPoint.Y - 1 + zParentInMe, 0, 0)));                 } else {                     //   getting here means the for/next loop ran to the end (zA is now zSplit.Length).                     zLNIs.Add(new LineNumberItem(-1, new Rectangle(0, zContentRectangle.Bottom, 0, 0)));                 }                   //   And now we can easily compute the height of the LineNumberItems by comparing each item's Y coordinate with that of the next line.                 //   There's at least two items in the list, and the last item is a "nextline-placeholder" that will be removed.                 for (zA = 0; zA <= zLNIs.Count - 2; zA++) {                     zLNIs[zA].Rectangle.Height = Math.Max(1, zLNIs[zA + 1].Rectangle.Y - zLNIs[zA].Rectangle.Y);                     //zLNIs(zA).Rectangle.Height = Math.Max(1, zLNIs(zA + 1).Rectangle.Y - zLNIs(zA).Rectangle.Y);                 }                 //   Removing the placeholder item                 zLNIs.RemoveAt(zLNIs.Count - 1);                   // Set the Format to the width of the highest possible number so that LeadingZeroes shows the correct amount of zeroes.                 if (zLineNumbers_ShowAsHexadecimal == true) {                     //zLineNumbers_Format = "".PadRight(zSplit.Length.ToString("X").Length, "0");                     zLineNumbers_Format = "".PadRight(zSplit.Length.ToString("X").Length, '0');                 } else {                     //zLineNumbers_Format = "".PadRight(zSplit.Length.ToString().Length, "0");                     zLineNumbers_Format = "".PadRight(zSplit.Length.ToString().Length, '0');                 }             }               //   To measure the LineNumber's width, its Format 0 is replaced by w as that is likely to be one of the widest characters in non-monospace fonts.             if (zAutoSizing == true)                 zAutoSizing_Size = new Size(TextRenderer.MeasureText(zLineNumbers_Format.Replace('0', 'W'), this.Font).Width, 0);                 //zAutoSizing_Size = new Size(TextRenderer.MeasureText(zLineNumbers_Format.Replace("0".ToCharArray(), "W".ToCharArray()), this.Font).Width, 0);         }           /// <summary>         /// FindStartIndex is a recursive Sub (one that calls itself) to compute the first visible line that should have a LineNumber.         /// </summary>         /// <param name="zMin"> this will hold the eventual BestStartIndex when the Sub has completed its run.</param>         /// <param name="zMax"></param>         /// <param name="zTarget"></param>         /// <remarks></remarks>         private void FindStartIndex(ref int zMin, ref int zMax, ref int zTarget)         {             //   Recursive Sub to compute best starting index - only run when zParent is known to exist             if (zMax == zMin + 1 | zMin == (zMax + zMin) / 2)                 return;               if(zParent.GetPositionFromCharIndex((zMax + zMin) / 2).Y == zTarget){                 //switch (zParent.GetPositionFromCharIndex((zMax + zMin) / 2).Y) {                 //  case  // ERROR: Case labels with binary operators are unsupported : Equality                 //   BestStartIndex found                 zMin = (zMax + zMin) / 2;                 //break;             }             else if (zParent.GetPositionFromCharIndex((zMax + zMin) / 2).Y > zTarget)             {                 //case  // ERROR: Case labels with binary operators are unsupported : GreaterThan                 //zTarget:                 //   Look again, in lower half                 zMax = (zMax + zMin) / 2;                 FindStartIndex(ref zMin, ref zMax, ref zTarget);                 //break;             }             else if (zParent.GetPositionFromCharIndex((zMax + zMin) / 2).Y < 0)             {                 // case  // ERROR: Case labels with binary operators are unsupported : LessThan                 //0:                 //   Look again, in top half                 zMin = (zMax + zMin) / 2;                 FindStartIndex(ref zMin, ref zMax, ref zTarget);                 //break;             }           }             /// <summary>         /// OnPaint will go through the enabled elements (vertical ReminderMessage, GridLines, LineNumbers, BorderLines, MarginLines) and will         /// draw them if enabled. At the same time, it will build GraphicsPaths for each of those elements (that are enabled), which will be used         /// in SeeThroughMode (if it's active): the figures in the GraphicsPaths will form a customized outline for the control by setting them as the         /// Region of the LineNumber control. Note: the vertical ReminderMessages are only drawn during designtime.         /// </summary>         /// <param name="e"></param>         /// <remarks></remarks>         protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)         {             //   Build the list of visible LineNumberItems (= zLNIs) first. (doesn't take long, so it can stay in OnPaint)             this.Update_VisibleLineNumberItems();             base.OnPaint(e);               // --- QualitySettings             if (zLineNumbers_AntiAlias == true) {                 e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;             } else {                 e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SystemDefault;             }               // --- Local Declarations             string zTextToShow = "";             string zReminderToShow = "";             StringFormat zSF = new StringFormat();             SizeF zTextSize = default(SizeF);             Pen zPen = new Pen(this.ForeColor);             SolidBrush zBrush = new SolidBrush(this.ForeColor);             Point zPoint = new Point(0, 0);             Rectangle zItemClipRectangle = new Rectangle(0, 0, 0, 0);               //   NOTE: The GraphicsPaths are only used for SeeThroughMode             //   FillMode.Winding: combined outline ( Alternate: XOR'ed outline )             System.Drawing.Drawing2D.GraphicsPath zGP_GridLines = new System.Drawing.Drawing2D.GraphicsPath(System.Drawing.Drawing2D.FillMode.Winding);             System.Drawing.Drawing2D.GraphicsPath zGP_BorderLines = new System.Drawing.Drawing2D.GraphicsPath(System.Drawing.Drawing2D.FillMode.Winding);             System.Drawing.Drawing2D.GraphicsPath zGP_MarginLines = new System.Drawing.Drawing2D.GraphicsPath(System.Drawing.Drawing2D.FillMode.Winding);             System.Drawing.Drawing2D.GraphicsPath zGP_LineNumbers = new System.Drawing.Drawing2D.GraphicsPath(System.Drawing.Drawing2D.FillMode.Winding);             Region zRegion = new Region(base.ClientRectangle);                 // ----------------------------------------------             // --- DESIGNTIME / NO VISIBLE ITEMS             if (this.DesignMode == true) {                 //   Show a vertical reminder message                 if (zParent == null) {                     zReminderToShow = "-!- Set ParentRichTextBox -!-";                 } else {                     if (zLNIs.Count == 0)                         zReminderToShow = "LineNrs (  " + zParent.Name + "  )";                 }                 if (zReminderToShow.Length > 0) {                     // --- Centering and Rotation for the reminder message                     e.Graphics.TranslateTransform(this.Width / 2, this.Height / 2);                     e.Graphics.RotateTransform(-90);                     zSF.Alignment = StringAlignment.Center;                     zSF.LineAlignment = StringAlignment.Center;                     // --- Show the reminder message (with small shadow)                     zTextSize = e.Graphics.MeasureString(zReminderToShow, this.Font, zPoint, zSF);                     e.Graphics.DrawString(zReminderToShow, this.Font, Brushes.WhiteSmoke, 1, 1, zSF);                     e.Graphics.DrawString(zReminderToShow, this.Font, Brushes.Firebrick, 0, 0, zSF);                     e.Graphics.ResetTransform();                       //Rectangle zReminderRectangle = new Rectangle(this.Width / 2 - zTextSize.Height / 2, this.Height / 2 - zTextSize.Width / 2, zTextSize.Height, zTextSize.Width);                     Rectangle zReminderRectangle = new Rectangle((int)(this.Width / 2 - zTextSize.Height / 2), (int)(this.Height / 2 - zTextSize.Width / 2), (int)(zTextSize.Height), (int)(zTextSize.Width));                     zGP_LineNumbers.AddRectangle(zReminderRectangle);                     zGP_LineNumbers.CloseFigure();                       if (zAutoSizing == true) {                         zReminderRectangle.Inflate((int)(zTextSize.Height * 0.2), (int)(zTextSize.Width * 0.1));                         //zReminderRectangle.Inflate(zTextSize.Height * 0.2, zTextSize.Width * 0.1);                         zAutoSizing_Size = new Size(zReminderRectangle.Width, zReminderRectangle.Height);                     }                 }             }                 // ----------------------------------------------             // --- DESIGN OR RUNTIME / WITH VISIBLE ITEMS (which means zParent exists)             if (zLNIs.Count > 0) {                 //   The visible LineNumberItems with their BackgroundGradient and GridLines                 //   Loop through every visible LineNumberItem                 System.Drawing.Drawing2D.LinearGradientBrush zLGB = null;                 zPen = new Pen(zGridLines_Color, zGridLines_Thickness);                 zPen.DashStyle = zGridLines_Style;                 zSF.Alignment = StringAlignment.Near;                 zSF.LineAlignment = StringAlignment.Near;                 //zSF.FormatFlags = StringFormatFlags.FitBlackBox + StringFormatFlags.NoClip + StringFormatFlags.NoWrap;                 zSF.FormatFlags = StringFormatFlags.FitBlackBox | StringFormatFlags.NoClip | StringFormatFlags.NoWrap;                     for (int zA = 0; zA <= zLNIs.Count - 1; zA++) {                     // --- BackgroundGradient                     if (zGradient_Show == true) {                         //zLGB = new Drawing2D.LinearGradientBrush(zLNIs(zA).Rectangle, zGradient_StartColor, zGradient_EndColor, zGradient_Direction);                         zLGB = new System.Drawing.Drawing2D.LinearGradientBrush(zLNIs[zA].Rectangle, zGradient_StartColor, zGradient_EndColor, zGradient_Direction);                         e.Graphics.FillRectangle(zLGB, zLNIs[zA].Rectangle);                         //e.Graphics.FillRectangle(zLGB, zLNIs(zA).Rectangle);                     }                       // --- GridLines                     if (zGridLines_Show == true) {                         e.Graphics.DrawLine(zPen, new Point(0, zLNIs[zA].Rectangle.Y), new Point(this.Width, zLNIs[zA].Rectangle.Y));                         //e.Graphics.DrawLine(zPen, new Point(0, zLNIs(zA).Rectangle.Y), new Point(this.Width, zLNIs(zA).Rectangle.Y));                           //   NOTE: Every item in a GraphicsPath is a closed figure, so instead of adding gridlines as lines, we'll add them                         //   as rectangles that loop out of sight. Their height uses the zContentRectangle which is the maxsize of                         //   the ParentRichTextBox's contents.                         //   NOTE: Slight adjustment needed when the first item has a negative Y coordinate.                         //   This explains the " - zLNIs(0).Rectangle.Y" (which adds the negative size to the height                         //   to make sure the rectangle's bottompart stays out of sight)                         //zGP_GridLines.AddRectangle(new Rectangle(-zGridLines_Thickness, zLNIs(zA).Rectangle.Y, this.Width + zGridLines_Thickness * 2, this.Height - zLNIs(0).Rectangle.Y + zGridLines_Thickness));                         zGP_GridLines.AddRectangle(new Rectangle(   (int)(-zGridLines_Thickness),                                                                                                             (int)(zLNIs[zA].Rectangle.Y),                                                                                                             (int)(this.Width + zGridLines_Thickness * 2),                                                                                                             (int)(this.Height - zLNIs[zA].Rectangle.Y + zGridLines_Thickness)                                                                                                             ));                         zGP_GridLines.CloseFigure();                     }                       // --- LineNumbers                     if (zLineNumbers_Show == true) {                         //   TextFormatting                         if (zLineNumbers_ShowLeadingZeroes == true) {                             zTextToShow = (zLineNumbers_ShowAsHexadecimal ? zLNIs[zA].LineNumber.ToString("X") : zLNIs[zA].LineNumber.ToString(zLineNumbers_Format));                             //zTextToShow = (zLineNumbers_ShowAsHexadecimal ? zLNIs(zA).LineNumber.ToString("X") : zLNIs(zA).LineNumber.ToString(zLineNumbers_Format));                         } else {                             zTextToShow = (zLineNumbers_ShowAsHexadecimal ? zLNIs[zA].LineNumber.ToString("X") : zLNIs[zA].LineNumber.ToString());                             //zTextToShow = (zLineNumbers_ShowAsHexadecimal ? zLNIs(zA).LineNumber.ToString("X") : zLNIs(zA).LineNumber.ToString);                         }                           //   TextSizing                         zTextSize = e.Graphics.MeasureString(zTextToShow, this.Font, zPoint, zSF);                         //   TextAlignment and positioning   (zPoint = TopLeftCornerPoint of the text)                         //   TextAlignment, padding, manual offset (via LineNrs_Offset) and zTextSize are all included in the calculation of zPoint.                         switch (zLineNumbers_Alignment) {                             case ContentAlignment.TopLeft:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Left + this.Padding.Left + zLineNumbers_Offset.Width), (int)(zLNIs[zA].Rectangle.Top + this.Padding.Top + zLineNumbers_Offset.Height));                                 break;                             case ContentAlignment.MiddleLeft:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Left + this.Padding.Left + zLineNumbers_Offset.Width), (int)(zLNIs[zA].Rectangle.Top + (zLNIs[zA].Rectangle.Height / 2) + zLineNumbers_Offset.Height - zTextSize.Height / 2));                                 break;                             case ContentAlignment.BottomLeft:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Left + this.Padding.Left + zLineNumbers_Offset.Width), (int)(zLNIs[zA].Rectangle.Bottom - this.Padding.Bottom + 1 + zLineNumbers_Offset.Height - zTextSize.Height));                                 break;                             case ContentAlignment.TopCenter:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Width / 2 + zLineNumbers_Offset.Width - zTextSize.Width / 2), (int)(zLNIs[zA].Rectangle.Top + this.Padding.Top + zLineNumbers_Offset.Height));                                 break;                             case ContentAlignment.MiddleCenter:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Width / 2 + zLineNumbers_Offset.Width - zTextSize.Width / 2), (int)(zLNIs[zA].Rectangle.Top + (zLNIs[zA].Rectangle.Height / 2) + zLineNumbers_Offset.Height - zTextSize.Height / 2));                                 break;                             case ContentAlignment.BottomCenter:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Width / 2 + zLineNumbers_Offset.Width - zTextSize.Width / 2), (int)(zLNIs[zA].Rectangle.Bottom - this.Padding.Bottom + 1 + zLineNumbers_Offset.Height - zTextSize.Height));                                 break;                             case ContentAlignment.TopRight:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Right - this.Padding.Right + zLineNumbers_Offset.Width - zTextSize.Width), (int)(zLNIs[zA].Rectangle.Top + this.Padding.Top + zLineNumbers_Offset.Height));                                 break;                             case ContentAlignment.MiddleRight:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Right - this.Padding.Right + zLineNumbers_Offset.Width - zTextSize.Width), (int)(zLNIs[zA].Rectangle.Top + (zLNIs[zA].Rectangle.Height / 2) + zLineNumbers_Offset.Height - zTextSize.Height / 2));                                 break;                             case ContentAlignment.BottomRight:                                 zPoint = new Point((int)(zLNIs[zA].Rectangle.Right - this.Padding.Right + zLineNumbers_Offset.Width - zTextSize.Width), (int)(zLNIs[zA].Rectangle.Bottom - this.Padding.Bottom + 1 + zLineNumbers_Offset.Height - zTextSize.Height));                                 break;                         }                         //   TextClipping                         zItemClipRectangle = new Rectangle(zPoint, zTextSize.ToSize());                         if (zLineNumbers_ClipByItemRectangle == true) {                             //   If selected, the text will be clipped so that it doesn't spill out of its own LineNumberItem-area.                             //   Only the part of the text inside the LineNumberItem.Rectangle should be visible, so intersect with the ItemRectangle                             //   The SetClip method temporary restricts the drawing area of the control for whatever is drawn next.                             zItemClipRectangle.Intersect(zLNIs[zA].Rectangle);                             e.Graphics.SetClip(zItemClipRectangle);                         }                         //   TextDrawing                         e.Graphics.DrawString(zTextToShow, this.Font, zBrush, zPoint, zSF);                         e.Graphics.ResetClip();                         //   The GraphicsPath for the LineNumber is just a rectangle behind the text, to keep the paintingspeed high and avoid ugly artifacts.                         zGP_LineNumbers.AddRectangle(zItemClipRectangle);                         zGP_LineNumbers.CloseFigure();                     }                 }                   // --- GridLinesThickness and Linestyle in SeeThroughMode. All GraphicsPath lines are drawn as solid to keep the paintingspeed high.                 if (zGridLines_Show == true) {                     zPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;                     zGP_GridLines.Widen(zPen);                 }                   // --- Memory CleanUp                 if (zLGB != null)                     zLGB.Dispose();             }                 // ----------------------------------------------             // --- DESIGN OR RUNTIME / ALWAYS             //Point zP_Left = new Point(Math.Floor(zBorderLines_Thickness / 2), Math.Floor(zBorderLines_Thickness / 2));             //Point zP_Right = new Point(this.Width - Math.Ceiling(zBorderLines_Thickness / 2), this.Height - Math.Ceiling(zBorderLines_Thickness / 2));               Point zP_Left = new Point(                                                                     (int)(Math.Floor(zBorderLines_Thickness / 2)),                                                                     (int)(Math.Floor(zBorderLines_Thickness / 2))                                                              );             Point zP_Right = new Point(                                                                     (int)(this.Width - Math.Ceiling(zBorderLines_Thickness / 2)),                                                                     (int)(this.Height - Math.Ceiling(zBorderLines_Thickness / 2))                                                                 );               // --- BorderLines             Point[] zBorderLines_Points = {                 new Point(zP_Left.X, zP_Left.Y),                 new Point(zP_Right.X, zP_Left.Y),                 new Point(zP_Right.X, zP_Right.Y),                 new Point(zP_Left.X, zP_Right.Y),                 new Point(zP_Left.X, zP_Left.Y)             };             if (zBorderLines_Show == true) {                 zPen = new Pen(zBorderLines_Color, zBorderLines_Thickness);                 zPen.DashStyle = zBorderLines_Style;                 e.Graphics.DrawLines(zPen, zBorderLines_Points);                 zGP_BorderLines.AddLines(zBorderLines_Points);                 zGP_BorderLines.CloseFigure();                 //   BorderThickness and Style for SeeThroughMode                 zPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;                 zGP_BorderLines.Widen(zPen);             }                 // --- MarginLines             if (zMarginLines_Show == true && zMarginLines_Side > LineNumberDockSide.None) {                 zP_Left = new Point((int)(-zMarginLines_Thickness), (int)(-zMarginLines_Thickness));                 zP_Right = new Point((int)(this.Width + zMarginLines_Thickness), (int)(this.Height + zMarginLines_Thickness));                 zPen = new Pen(zMarginLines_Color, zMarginLines_Thickness);                 zPen.DashStyle = zMarginLines_Style;                 if (zMarginLines_Side == LineNumberDockSide.Left | zMarginLines_Side == LineNumberDockSide.Height) {                     e.Graphics.DrawLine(zPen, new Point(                                                                                             (int)(Math.Floor(zMarginLines_Thickness / 2)), 0),                                                                                             new Point(                                                                                                                 (int)(Math.Floor(zMarginLines_Thickness / 2)),                                                                                                                 this.Height - 1)                                                                                                                 );                     zP_Left = new Point(                                                             (int)(Math.Ceiling(zMarginLines_Thickness / 2)),                                                             (int)(-zMarginLines_Thickness));                 }                 if (zMarginLines_Side == LineNumberDockSide.Right | zMarginLines_Side == LineNumberDockSide.Height) {                     e.Graphics.DrawLine(zPen, new Point(                                                                                             (int)(this.Width - Math.Ceiling(zMarginLines_Thickness / 2)), 0),                                                                                             new Point(                                                                                                                 (int)(this.Width - Math.Ceiling(zMarginLines_Thickness / 2)),                                                                                                                 (int)(this.Height - 1))                                                                                         );                       zP_Right = new Point(                                                                 (int)(this.Width - Math.Ceiling(zMarginLines_Thickness / 2)),                                                                 (int)(this.Height + zMarginLines_Thickness)                                                             );                 }                 //   GraphicsPath for the MarginLines(s):                 //   MarginLines(s) are drawn as a rectangle connecting the zP_Left and zP_Right points, which are either inside or                 //   outside of sight, depending on whether the MarginLines at that side is visible. zP_Left: TopLeft and ZP_Right: BottomRight                 zGP_MarginLines.AddRectangle(new Rectangle(zP_Left, new Size(zP_Right.X - zP_Left.X, zP_Right.Y - zP_Left.Y)));                 zPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;                 zGP_MarginLines.Widen(zPen);             }                 // ----------------------------------------------             // --- SeeThroughMode             //   combine all the GraphicsPaths (= zGP_... ) and set them as the region for the control.             if (zSeeThroughMode == true) {                 zRegion.MakeEmpty();                 zRegion.Union(zGP_BorderLines);                 zRegion.Union(zGP_MarginLines);                 zRegion.Union(zGP_GridLines);                 zRegion.Union(zGP_LineNumbers);             }               // --- Region             if (zRegion.GetBounds(e.Graphics).IsEmpty == true) {                 //   Note: If the control is in a condition that would show it as empty, then a border-region is still drawn regardless of it's borders on/off state.                 //   This is added to make sure that the bounds of the control are never lost (it would remain empty if this was not done).                 zGP_BorderLines.AddLines(zBorderLines_Points);                 zGP_BorderLines.CloseFigure();                 zPen = new Pen(zBorderLines_Color, 1);                 zPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;                 zGP_BorderLines.Widen(zPen);                   zRegion = new Region(zGP_BorderLines);             }             this.Region = zRegion;                 // ----------------------------------------------             // --- Memory CleanUp             if (zPen != null)                 zPen.Dispose();             if (zBrush != null)                 zPen.Dispose();             if (zRegion != null)                 zRegion.Dispose();             if (zGP_GridLines != null)                 zGP_GridLines.Dispose();             if (zGP_BorderLines != null)                 zGP_BorderLines.Dispose();             if (zGP_MarginLines != null)                 zGP_MarginLines.Dispose();             if (zGP_LineNumbers != null)                 zGP_LineNumbers.Dispose();           }             ////////////////////////////////////////////////////////////////////////////////////////////////////           private void zTimer_Tick(object sender, System.EventArgs e)         {             zParentIsScrolling = false;             zTimer.Stop();             this.Invalidate();         }           private void zParent_Changed(object sender, System.EventArgs e)         {             this.Refresh();             this.Invalidate();         }           private void zParent_Scroll(object sender, System.EventArgs e)         {             zParentIsScrolling = true;             this.Invalidate();         }           private void zParent_ContentsResized(object sender, System.Windows.Forms.ContentsResizedEventArgs e)         {             zContentRectangle = e.NewRectangle;             this.Refresh();             this.Invalidate();         }           private void zParent_Disposed(object sender, System.EventArgs e)         {             this.ParentRichTextBox = null;             this.Refresh();             this.Invalidate();         }       } }