code/Controls/IPv4.cs

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

namespace Sylloge.Controls
{
    public partial class IPv4 : UserControl
    {
        #region Events

        public delegate void DelegateOctetChanged(int octet, string value);
        public event DelegateOctetChanged OctetChanged;
        public delegate void DelegateIpAddressChanged(string value);
        public event DelegateIpAddressChanged IpAddressChanged;

        private void OnOctetChange(int octet, string value)
        {
            if (this.OctetChanged != null) { this.OctetChanged(octet, value); }
            this.OnIpChange();
        }

        private void OnIpChange()
        {
            if (this.IpAddressChanged != null) { this.IpAddressChanged(this.IpAddress); }
        }

        #endregion

        #region Local Attributes

        private System.Windows.Forms.TextBox _CurrentTextBox;
        private bool _IsSettingIp;

        #endregion

        #region Class Methods and Properties

        public IPv4()
        {
            this.InitializeComponent();
            this.c_TextBoxOctet1.Tag = 1;
            this.c_TextBoxOctet1.Tag = 2;
            this.c_TextBoxOctet1.Tag = 3;
            this.c_TextBoxOctet1.Tag = 4;
        }

        ~IPv4()
        {
        }

        public string IpAddress
        {
            get
            {
                string Ip = this.c_TextBoxOctet1.Text + "." +
                            this.c_TextBoxOctet2.Text + "." +
                            this.c_TextBoxOctet3.Text + "." +
                            this.c_TextBoxOctet4.Text;
                return Ip;
            }
            set
            {
                try {
                    this._IsSettingIp = true;
                    if (!Sylloge.Net.IPv4.IsValidIp(value)) {
                        this.c_TextBoxOctet1.Text = "0";
                        this.c_TextBoxOctet2.Text = "0";
                        this.c_TextBoxOctet3.Text = "0";
                        this.c_TextBoxOctet4.Text = "0";
                    } else {
                        string[] Ip = value.Split('.');
                        this.c_TextBoxOctet1.Text = Ip[0];
                        this.c_TextBoxOctet2.Text = Ip[1];
                        this.c_TextBoxOctet3.Text = Ip[2];
                        this.c_TextBoxOctet4.Text = Ip[3];
                    }
                } catch (Exception ex) {
                    // This should only happen if there was a programmer error
                    // Don't alert anyone, just print it out.
                    //MyMessageBox.Show("Error setting IP address:" + Environment.NewLine + ex.ToString());
                    Console.WriteLine("IPv4 Error:" + ex.Message);
                    this.c_TextBoxOctet1.Text = "0";
                    this.c_TextBoxOctet2.Text = "0";
                    this.c_TextBoxOctet3.Text = "0";
                    this.c_TextBoxOctet4.Text = "0";
                }
                this._IsSettingIp = false;
            }
        }

        public override string ToString()
        {
            return this.IpAddress;
        }

        #endregion

        #region Control Event Handlers

        private void c_TextBoxOctet_Enter(object sender, System.EventArgs e)
        {
            System.Windows.Forms.TextBox box = (System.Windows.Forms.TextBox)sender;
            this._CurrentTextBox = box;
            box.BackColor = Color.LightBlue;
            box.SelectAll();
        }

        private void c_TextBoxOctet_Leave(object sender, System.EventArgs e)
        {
            ((System.Windows.Forms.TextBox)sender).BackColor = Color.White;
        }

        private void c_TextBoxOctet_TextChanged(object sender, System.EventArgs e)
        {
            System.Windows.Forms.TextBox box = (System.Windows.Forms.TextBox)sender;
            this._CurrentTextBox = box;
            if (box.Text == string.Empty || box.Text == null) { box.Text = "0"; }
            if (Convert.ToInt32(box.Text) < 0) { box.Text = "0"; }
            if (Convert.ToInt32(box.Text) > 255) { box.Text = "255"; }
            if (box.Text.Length == 3 && !this._IsSettingIp) { this.SelectNextControl(box, true, true, true, false); }
            this.OnOctetChange((int)box.Tag, box.Text);
        }

        private void c_TextBoxOctet_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            System.Windows.Forms.TextBox box = (System.Windows.Forms.TextBox)sender;
            this._CurrentTextBox = box;
            if (e.KeyChar == '.') { this.SelectNextControl(box, true, true, true, false); }
            e.Handled = !Char.IsDigit(e.KeyChar) && !Char.IsControl(e.KeyChar);
        }

        #endregion

    }
}