IPBoxControl 开发手记（二）

    如果哪位发现什么问题和bug，请多多指出，我会及时修改。谢谢！

/**/ /*
 * Purpose: IPAddress TextBox Control.
 * Author: Vincent
 * Date: 2004-10-29
 *
 */

using  System;
using  System.Windows.Forms;

namespace  Sci.Vincent.Controls
{
    /**//// <summary>
    /// IP Address Box Control.
    /// </summary>
    public class IPBox : System.Windows.Forms.UserControl
    {
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.TextBox textBox4;

        /**//// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        private System.Windows.Forms.Panel panel1;

        private const int DEFAULT_WIDTH_SIZE = 136;
        private const int DEFAULT_HEIGHT_SIZE = 20;
        private string _text = "";
        private bool _isAllowWarn = true;
        private Languages _language = Languages.English;

        /**//// <summary>
        /// Usable languages enumeration.
        /// </summary>
        public enum Languages
        {
            /**//// <summary>
            /// English language
            /// </summary>
            English,
            /**//// <summary>
            /// Chinese language
            /// </summary>
            Chinese
        }


        /**//// <summary>
        /// Creates an instance of the IPBox class.
        /// </summary>
        public IPBox()
        {
            // This call is required by the Windows.Forms Form Designer.
            InitializeComponent();

            // TODO: Add any initialization after the InitComponent call

        }

        /**//// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                    components.Dispose();
            }
            base.Dispose(disposing);
        }

        Component Designer generated code#region Component Designer generated code

        /**//// <summary>
        /// Required method for Designer support - do not modify 
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.label3 = new System.Windows.Forms.Label();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.textBox4 = new System.Windows.Forms.TextBox();
            this.panel1 = new System.Windows.Forms.Panel();
            this.panel1.SuspendLayout();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.textBox1.Location = new System.Drawing.Point(8, 0);
            this.textBox1.MaxLength = 3;
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(20, 13);
            this.textBox1.TabIndex = 0;
            this.textBox1.Text = "";
            this.textBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
            this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox1_KeyPress);
            // 
            // label1
            // 
            this.label1.BackColor = System.Drawing.SystemColors.Window;
            this.label1.Location = new System.Drawing.Point(32, 0);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(8, 14);
            this.label1.TabIndex = 1;
            this.label1.Text = ".";
            this.label1.TextAlign = System.Drawing.ContentAlignment.TopCenter;
            // 
            // label2
            // 
            this.label2.BackColor = System.Drawing.SystemColors.Window;
            this.label2.Location = new System.Drawing.Point(64, 0);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(8, 14);
            this.label2.TabIndex = 3;
            this.label2.Text = ".";
            this.label2.TextAlign = System.Drawing.ContentAlignment.TopCenter;
            // 
            // textBox2
            // 
            this.textBox2.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.textBox2.Location = new System.Drawing.Point(40, 0);
            this.textBox2.MaxLength = 3;
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(20, 13);
            this.textBox2.TabIndex = 2;
            this.textBox2.Text = "";
            this.textBox2.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
            this.textBox2.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox2_KeyPress);
            // 
            // label3
            // 
            this.label3.BackColor = System.Drawing.SystemColors.Window;
            this.label3.Location = new System.Drawing.Point(96, 0);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(8, 14);
            this.label3.TabIndex = 5;
            this.label3.Text = ".";
            this.label3.TextAlign = System.Drawing.ContentAlignment.TopCenter;
            // 
            // textBox3
            // 
            this.textBox3.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.textBox3.Location = new System.Drawing.Point(72, 0);
            this.textBox3.MaxLength = 3;
            this.textBox3.Name = "textBox3";
            this.textBox3.Size = new System.Drawing.Size(20, 13);
            this.textBox3.TabIndex = 4;
            this.textBox3.Text = "";
            this.textBox3.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
            this.textBox3.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox3_KeyPress);
            // 
            // textBox4
            // 
            this.textBox4.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.textBox4.Location = new System.Drawing.Point(104, 0);
            this.textBox4.MaxLength = 3;
            this.textBox4.Name = "textBox4";
            this.textBox4.Size = new System.Drawing.Size(20, 13);
            this.textBox4.TabIndex = 6;
            this.textBox4.Text = "";
            this.textBox4.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
            this.textBox4.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox4_KeyPress);
            // 
            // panel1
            // 
            this.panel1.BackColor = System.Drawing.SystemColors.Window;
            this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.panel1.Controls.Add(this.textBox1);
            this.panel1.Controls.Add(this.textBox4);
            this.panel1.Controls.Add(this.label1);
            this.panel1.Controls.Add(this.label3);
            this.panel1.Controls.Add(this.textBox3);
            this.panel1.Controls.Add(this.textBox2);
            this.panel1.Controls.Add(this.label2);
            this.panel1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.panel1.Location = new System.Drawing.Point(0, 0);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(136, 20);
            this.panel1.TabIndex = 8;
            // 
            // IPBox
            // 
            this.Controls.Add(this.panel1);
            this.Name = "IPBox";
            this.Size = new System.Drawing.Size(136, 20);
            this.SizeChanged += new System.EventHandler(this.IPBox_SizeChanged);
            this.panel1.ResumeLayout(false);
            this.ResumeLayout(false);

        }

        #endregion

        /**//// <summary>
        /// Masks IP Address.
        /// </summary>
        /// <param name="textBox"></param>
        /// <param name="e"></param>
        private void MaskIPAddress(TextBox textBox, KeyPressEventArgs e)
        {
            // Only allow digit, '.' and "BackSpace" key.
            if (Char.IsDigit(e.KeyChar) || e.KeyChar == '.' || e.KeyChar == 8)
            {
                if (e.KeyChar != 8)
                {
                    if (textBox.Text.Length == 2 && e.KeyChar != '.')
                    {
                        Validate(textBox, textBox.Text + e.KeyChar);
                        e.Handled = true;
                    }
                    else if (e.KeyChar == '.')
                    {
                        if (textBox.Text.Length == 0)
                        {
                            textBox.Text = "";
                        }
                        else
                        {
                            FocusNext(textBox);
                        }
                        e.Handled = true;
                    }
                }
                else if (textBox.Text.Length == 0)
                {
                    FocusPreviouse(textBox);
                    e.Handled = false;
                }
            }
            else
            {
                e.Handled = true; // Ignore other keys
            }
        }

        /**//// <summary>
        /// Focuses the previous textbox.
        /// </summary>
        /// <param name="textBox"></param>
        private void FocusPreviouse(TextBox textBox)
        {
            switch (textBox.Name)
            {
                case "textBox2":
                    textBox1.Focus();
                    textBox1.SelectionStart = textBox1.Text.Length;
                    break;
                case "textBox3":
                    textBox2.Focus();
                    textBox2.SelectionStart = textBox2.Text.Length;
                    break;
                case "textBox4":
                    textBox3.Focus();
                    textBox3.SelectionStart = textBox3.Text.Length;
                    break;
                default:
                    break;
            }
        }

        /**//// <summary>
        /// Focuses the next textbox.
        /// </summary>
        /// <param name="textBox"></param>
        private void FocusNext(TextBox textBox)
        {
            switch (textBox.Name)
            {
                case "textBox1":
                    textBox2.Focus();
                    textBox2.SelectAll();
                    break;
                case "textBox2":
                    textBox3.Focus();
                    textBox3.SelectAll();
                    break;
                case "textBox3":
                    textBox4.Focus();
                    textBox4.SelectAll();
                    break;
                default:
                    break;
            }
        }

        /**//// <summary>
        /// Validates whether the string is correct.
        /// </summary>
        /// <param name="currentTextBox">Current textbox</param>
        /// <param name="str">input string</param>
        private void Validate(TextBox currentTextBox, string str)
        {
            int maxValue = currentTextBox.Name.Equals("textBox1") ? 233 : 255;

            TextBox nextTextBox = currentTextBox;
            switch (currentTextBox.Name)
            {
                case "textBox1":
                    nextTextBox = textBox2;
                    break;
                case "textBox2":
                    nextTextBox = textBox3;
                    break;
                case "textBox3":
                    nextTextBox = textBox4;
                    break;
                default:
                    break;
            }

            if (Int32.Parse(str) > maxValue)
            {
                currentTextBox.Text = maxValue.ToString();
                currentTextBox.Focus();
                if (AllowWarn)
                {
                    switch (Language)
                    {
                        case Languages.English:
                            MessageBox.Show(str + " is not a valid entry. Please specify a value between 1 and " +
                                maxValue, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                            break;
                        case Languages.Chinese:
                            MessageBox.Show(str + " 不是一个有效值。请指定一个介于 1 和 " + maxValue +
                                " 之间的数值", "错误", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                            break;
                    }
                }
            }
            else
            {
                currentTextBox.Text = str;
                if (!nextTextBox.Equals(currentTextBox))
                {
                    nextTextBox.Focus();
                    nextTextBox.SelectAll();
                }
                else
                {
                    currentTextBox.SelectionStart = currentTextBox.Text.Length;
                }
            }
        }

        /**//// <summary>
        /// Overrided. Returns IP Address.
        /// </summary>
        public override string Text
        {
            get
            {
                if (textBox1.Text.Length == 0 || textBox2.Text.Length == 0 ||
                    textBox3.Text.Length == 0 || textBox4.Text.Length == 0)
                {
                    _text = "";
                }
                else
                {
                    _text = textBox1.Text + "." + textBox2.Text +
                        "." + textBox3.Text + "." + textBox4.Text;
                }
                return _text;
            }
        }

        /**//// <summary>
        /// Returns whether allow warining informaiton when user input incorrect format.
        /// </summary>
        public bool AllowWarn
        {
            get { return _isAllowWarn; }
            set { _isAllowWarn = value; }
        }

        /**//// <summary>
        /// Specifies language of warning information.
        /// </summary>
        public Languages Language
        {
            get { return _language; }
            set { _language = value; }
        }

        /**//// <summary>
        /// Overrided. Returns whether the IPBox control is focused.
        /// </summary>
        public override bool Focused
        {
            get
            {
                if (textBox1.Focused || textBox2.Focused ||
                    textBox3.Focused || textBox4.Focused)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }

        /**//// <summary>
        /// Focus the IPBox.
        /// </summary>
        /// <returns></returns>
        public new bool Focus()
        {
            return textBox1.Focus();
        }

        /**//// <summary>
        /// Clears the IPBox's Text.
        /// </summary>
        public void Clear()
        {
            textBox1.Clear();
            textBox2.Clear();
            textBox3.Clear();
            textBox4.Clear();
            textBox1.Focus();
        }

        /**//// <summary>
        /// Forbids to change the size of IPBox Control.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void IPBox_SizeChanged(object sender, System.EventArgs e)
        {
            this.Width = DEFAULT_WIDTH_SIZE;
            this.Height = DEFAULT_HEIGHT_SIZE;
        }

        private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            MaskIPAddress(textBox1, e);
        }

        private void textBox2_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            MaskIPAddress(textBox2, e);
        }

        private void textBox3_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            MaskIPAddress(textBox3, e);
        }

        private void textBox4_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            MaskIPAddress(textBox4, e);
        }
    }
}

转载于:https://www.cnblogs.com/seagle0128/archive/2004/10/31/58823.html