//-----------------------------------------------------------------------
// <copyright file="IPTextBox.cs" company="NoteFly">
// NoteFly a note application.
// Copyright (C) 2012 Tom
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// </copyright>
//-----------------------------------------------------------------------
namespace NoteFly
{
using System.Drawing;
using System.Windows.Forms;
/// <summary>
/// IP address textbox.
/// With background color ip address validation hint.
/// </summary>
internal partial class IPTextBox : TextBox
{
/// <summary>
/// IPAddress object.
/// </summary>
private System.Net.IPAddress ipaddr;
/// <summary>
/// Use a IPv4 address.
/// </summary>
private bool useipv4addr = true;
/// <summary>
/// Use a IPv6 address
/// </summary>
private bool useipv6addr = true;
/// <summary>
/// Gets or sets a value indicating whether a IPv4 address is used.
/// </summary>
public bool UseIPv4addr
{
get
{
return this.useipv4addr;
}
set
{
this.useipv4addr = value;
}
}
/// <summary>
/// Gets or sets a value indicating whether a IPv6 address is used.
/// </summary>
public bool UseIPv6addr
{
get
{
return this.useipv6addr;
}
set
{
this.useipv6addr = value;
}
}
/// <summary>
/// Get the IP address
/// </summary>
/// <returns>The IP address as string or empty string if no address entered</returns>
public string GetIPAddress()
{
if (this.ipaddr != null)
{
return this.ipaddr.ToString();
}
else
{
return string.Empty;
}
}
/// <summary>
/// Check if the ip address in the text propertie is valid.
/// And set the backgroundcolor of this control if text contains a valid ip address to LightGreen.
/// And if the text contains an invalid ip address to Salmon.
/// </summary>
public void ValidateIP()
{
bool validipaddr = System.Net.IPAddress.TryParse(this.Text, out this.ipaddr);
if (validipaddr)
{
if (this.getnumofdots() == 3 && this.getnumofdash() == 0)
{
// valid IPv4 address
if (this.useipv4addr)
{
this.BackColor = System.Drawing.Color.LightGreen;
}
else
{
// IPv4 address not allowed, but ip valid, orange for "warning".
this.BackColor = System.Drawing.Color.Orange;
}
}
else if (this.getnumofdots() == 0 && this.getnumofdash() >= 2)
{
// valid IPv6 address
if (this.useipv6addr)
{
this.BackColor = System.Drawing.Color.LightGreen;
}
else
{
// IPv6 address not allowed, but ip valid, orange for "warning".
this.BackColor = System.Drawing.Color.Orange;
}
}
}
else
{
if (this.TextLength > 0)
{
this.BackColor = System.Drawing.Color.Salmon;
}
else
{
this.BackColor = System.Drawing.SystemColors.Window;
}
}
}
/// <summary>
/// Character entered.
/// Allow only IPv4 and IPv6 characters to be added.
/// </summary>
/// <param name="e">Keyevent arguments</param>
protected override void OnKeyDown(KeyEventArgs e)
{
int k = e.KeyValue;
// 'a'-'f'
// ':'
// '.'
// '0'-'9'
// shift, backspace, left, right, delete, end and home key
if ((k >= 65 && k <= 70) || (k == 186 && e.Shift) || (k == 190 && !e.Shift) || (k >= 48 && k <= 57) || (k == 8 || k == 16 || k == 37 || k == 39 || k == 46 || k == 35 || k == 36))
{
e.SuppressKeyPress = false;
}
else
{
e.SuppressKeyPress = true;
}
base.OnKeyDown(e);
}
/// <summary>
/// Validate ip address on key up.
/// </summary>
/// <param name="e">Keyboard event arguments</param>
protected override void OnKeyUp(KeyEventArgs e)
{
this.ValidateIP();
base.OnKeyUp(e);
}
/// <summary>
/// Revalidate ip address on enable/disable change of this control.
/// </summary>
/// <param name="e">Event arguments</param>
protected override void OnEnabledChanged(System.EventArgs e)
{
if (!this.Enabled)
{
this.BackColor = SystemColors.Control;
}
else
{
this.BackColor = SystemColors.Window;
if (this.TextLength > 0)
{
this.ValidateIP();
}
}
base.OnEnabledChanged(e);
}
/// <summary>
/// Get the number of dots in the Text content.
/// </summary>
/// <returns>The number of dots</returns>
private int getnumofdots()
{
return this.getnumofchar('.');
}
/// <summary>
/// Get the number of dashes in the Text content.
/// </summary>
/// <returns>The number of dashes</returns>
private int getnumofdash()
{
return this.getnumofchar(':');
}
/// <summary>
/// Get the number of occurance of a particular character in the Text content.
/// </summary>
/// <param name="c">The characters to count</param>
/// <returns>The number of chracters</returns>
private int getnumofchar(char c)
{
int numdots = 0;
for (int i = 0; i < this.Text.Length; i++)
{
if (this.Text[i] == c)
{
numdots++;
}
}
return numdots;
}
}
}
