ColorTextBox

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ColorTextBoxControl;

namespace ColorTextBoxDemo {
    public partial class ColorTextBoxDemo2 : Form {
        public ColorTextBoxDemo2() {
            InitializeComponent();
            colorTextBox1.CaretChanged += new CaretEventHandler(colorTextBox1_CaretChanged);
            colorDialog1.Color = Color.Black;
            this.AcceptButton = button1;
        }

        void colorTextBox1_CaretChanged(object source, CaretEventArgs args) {
            if (args.Type == CaretEventType.Changed) {
                if (colorTextBox1.SelectionLength == 0) {
                    fromLine.Text = toLine.Text = colorTextBox1.GetLineNumber(args.NewPos.ILine).ToString();
                    toPos.Text = fromPos.Text = args.NewPos.LinePos.ToString();
                }
                else {
                    IPosition from = colorTextBox1.SelectionFromPos;
                    IPosition to = colorTextBox1.SelectionToPos;
                    fromLine.Text = colorTextBox1.GetLineNumber(from.ILine).ToString();
                    fromPos.Text = from.LinePos.ToString();
                    toLine.Text = colorTextBox1.GetLineNumber(to.ILine).ToString();
                    toPos.Text = to.LinePos.ToString();
                }
            }
        }

        private void insert_Click(object sender, EventArgs e) {
            colorTextBox1.SelectedText = text.Text;
        }

        private void setColor_Click(object sender, EventArgs e) {
            colorTextBox1.SelectionColor = colorDialog1.Color;
            colorTextBox1.Focus();
        }

        private void setCaretSelection_Click(object sender, EventArgs e) {
            //Position from = new Position(colorTextBox1.GetLineAt(
            Position from = getPos(fromLine, fromPos);
            Position to = getPos(toLine, toPos);
            if (from != null && to != null) {
                if (from.Equals(to)) colorTextBox1.Caret = from;
                else colorTextBox1.Select(from, to);
            }
            else if (from == null) {
                if (to == null) MessageBox.Show("From and To position are invalid!");
                else MessageBox.Show("From position is invalid!");
            }
            else MessageBox.Show("To position is invalid!");
        }

        private void selectColor_Click(object sender, EventArgs e) {
            DialogResult res = colorDialog1.ShowDialog(this);
            if (res == DialogResult.OK || res == DialogResult.Yes) {
                colorTextBox1.SelectionColor = colorDialog1.Color;
                colLabel.BackColor = colorDialog1.Color;
            }
        }

        private Position getPos(ColorTextBox lb, ColorTextBox pb) {
            int l, p;
            if (Int32.TryParse(lb.Text, out l) &&
                Int32.TryParse(pb.Text, out p)) {
                Line line = colorTextBox1.GetLineAt(l);
                if (line != null && p >= 0 && p <= line.LastPos) {
                    return new Position(line, p);
                }
            }
            return null;
        }

        private void delete_Click(object sender, EventArgs e) {
            if (colorTextBox1.SelectionLength == 0) {
                if (colorTextBox1.Caret != null) {
                    colorTextBox1.Delete(colorTextBox1.Caret, -1);
                }
                else MessageBox.Show("There is currently no text selected and no caret set!");
            }
            else {
                colorTextBox1.SelectedText = String.Empty;
            }
        }

        private void insertNewline_Click(object sender, EventArgs e) {
            colorTextBox1.Insert("\r\n");
        }

        private void colLabel_Click(object sender, EventArgs e) {
            DialogResult res = colorDialog1.ShowDialog(this);
            if (res == DialogResult.OK || res == DialogResult.Yes) {
                colorTextBox1.SelectionColor = colorDialog1.Color;
                colLabel.BackColor = colorDialog1.Color;
            }
        }
    }
}