using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Drawing;

using System.Data;

using System.Drawing.Drawing2D;

using System.Text;

using System.Windows.Forms;

namespace FastColoredTextBoxNS

{

public partial class Ruler : UserControl

{

public EventHandler TargetChanged;

[DefaultValue(typeof(Color), "ControlLight")]

public Color BackColor2 { get; set; }

[DefaultValue(typeof(Color), "DarkGray")]

public Color TickColor { get; set; }

[DefaultValue(typeof(Color), "Black")]

public Color CaretTickColor { get; set; }

FastColoredTextBox target;

[Description("Target FastColoredTextBox")]

public FastColoredTextBox Target

{

get { return target; }

set

{

if (target != null)

UnSubscribe(target);

target = value;

Subscribe(target);

OnTargetChanged();

}

}

public Ruler()

{

InitializeComponent();

SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.UserPaint, true);

MinimumSize = new Size(0, 24);

MaximumSize = new Size(int.MaxValue/2, 24);

BackColor2 = SystemColors.ControlLight;

TickColor = Color.DarkGray;

CaretTickColor = Color.Black;

}

protected virtual void OnTargetChanged()

{

if (TargetChanged != null)

TargetChanged(this, EventArgs.Empty);

}

protected virtual void UnSubscribe(FastColoredTextBox target)

{

target.Scroll -= new ScrollEventHandler(target_Scroll);

target.SelectionChanged -= new EventHandler(target_SelectionChanged);

target.VisibleRangeChanged -= new EventHandler(target_VisibleRangeChanged);

}

protected virtual void Subscribe(FastColoredTextBox target)

{

target.Scroll += new ScrollEventHandler(target_Scroll);

target.SelectionChanged += new EventHandler(target_SelectionChanged);

target.VisibleRangeChanged += new EventHandler(target_VisibleRangeChanged);

}

void target_VisibleRangeChanged(object sender, EventArgs e)

{

Invalidate();

}

void target_SelectionChanged(object sender, EventArgs e)

{

Invalidate();

}

protected virtual void target_Scroll(object sender, ScrollEventArgs e)

{

Invalidate();

}

protected override void OnResize(EventArgs e)

{

base.OnResize(e);

Invalidate();

}

protected override void OnPaint(PaintEventArgs e)

{

if (target == null)

return;

Point car = PointToClient(target.PointToScreen(target.PlaceToPoint(target.Selection.Start)));

Size fontSize = TextRenderer.MeasureText("W", Font);

int column = 0;

e.Graphics.FillRectangle(new LinearGradientBrush(new Rectangle(0, 0, Width, Height), BackColor, BackColor2, 270), new Rectangle(0, 0, Width, Height));

float columnWidth = target.CharWidth;

var sf = new StringFormat();

sf.Alignment = StringAlignment.Center;

sf.LineAlignment = StringAlignment.Near;

var zeroPoint = target.PositionToPoint(0);

zeroPoint = PointToClient(target.PointToScreen(zeroPoint));

using (var pen = new Pen(TickColor))

using (var textBrush = new SolidBrush(ForeColor))

for (float x = zeroPoint.X; x < Right; x += columnWidth, ++column)

{

if (column % 10 == 0)

e.Graphics.DrawString(column.ToString(), Font, textBrush, x, 0f, sf);

e.Graphics.DrawLine(pen, (int)x, fontSize.Height + (column % 5 == 0 ? 1 : 3), (int)x, Height - 4);

}

using (var pen = new Pen(TickColor))

e.Graphics.DrawLine(pen, new Point(car.X - 3, Height - 3), new Point(car.X + 3, Height - 3));

using (var pen = new Pen(CaretTickColor))

{

e.Graphics.DrawLine(pen, new Point(car.X - 2, fontSize.Height + 3), new Point(car.X - 2, Height - 4));

e.Graphics.DrawLine(pen, new Point(car.X, fontSize.Height + 1), new Point(car.X, Height - 4));

e.Graphics.DrawLine(pen, new Point(car.X + 2, fontSize.Height + 3), new Point(car.X + 2, Height - 4));

}

}

}

}