[200分] RichTextBox 关 于 链 接 的 问 题 , 比 较 困 难

 private System.Collections.ArrayList arr;



        private float oneWord;

        private void Form1_Load(object sender, EventArgs e)

        {

            this.richTextBox1.Text += "http://www.1111111111..com\n";

            this.richTextBox1.Text += "http://www.baidu.com\n";

            this.richTextBox1.Text += "http://www.xiaonei.com\n";

            this.richTextBox1.Text += "http://www.2222.2222.com\n";

            this.richTextBox1.Text += "http://www.3333333.com\n";

            this.richTextBox1.Text += "http://www.44444.com";

            this.richTextBox1.Text += "http://www.xiaon2222ei.com";

            this.richTextBox1.Text += "http://www.66666666.com\n";

            this.richTextBox1.Text += "www.66666666.com\n";



            InitializeArr();

        }



        //初始化字符串数组

        private void InitializeArr()

        {

            arr = new System.Collections.ArrayList();

            int i = 0;

            Graphics g = this.CreateGraphics();

            //计算一个字母的长度

            oneWord = (g.MeasureString("00123456789", this.richTextBox1.Font).Width - g.MeasureString("0", this.richTextBox1.Font).Width) / 10.0f;

            int maxCount = (int)(this.richTextBox1.Width / oneWord);

            string str = string.Empty;

            foreach (char charEach in this.richTextBox1.Text)

            {

                i += System.Text.Encoding.GetEncoding("GB2312").GetByteCount(charEach.ToString());

                str += charEach;

                //实际规则比这复杂，再改改

                if (i == maxCount || charEach == '\n')

                {

                    arr.Add(str);

                    i = 0;

                    str = string.Empty;

                }

            }

            if (i < maxCount && i != 0 && str != string.Empty)

            {

                arr.Add(str);

            }

        }

        private void richTextBox1_LinkClicked(object sender, LinkClickedEventArgs e)

        {

            System.Diagnostics.Process p = new System.Diagnostics.Process();



            p = System.Diagnostics.Process.Start("IExplore.exe", e.LinkText);

        }



        private void richTextBox1_MouseMove(object sender, MouseEventArgs e)

        {

            try

            {

                this.textBox1.Text = "";

                Point position = e.Location;

                System.Drawing.Font font = this.richTextBox1.Font;

                Graphics g = this.CreateGraphics();

                float height = g.MeasureString("f", font).Height + 2.5f;

                //计算出当前鼠标在第几行

                int count = (int)Math.Ceiling(position.Y / height);

                //行横坐标

                int xIndex = (int)Math.Ceiling(position.X / oneWord);

                if (arr.Count >= count)

                {

                    string a = arr[count - 1].ToString();

                    //找出正确的链接地址

                    foreach (System.Text.RegularExpressions.Match match in System.Text.RegularExpressions.Regex.Matches(a, @"(http:\\)?www.([\w|.]+).com"))

                    {

                        if (match.Success)

                        {

                            int indexStart = a.IndexOf(match.Value);

                            int indexEnd = indexStart + match.Value.Length;

                            if (indexStart <= xIndex && indexEnd >= xIndex)

                            {

                                this.textBox1.Text = a;

                                break;

                            }

                        }

                    }

                }

            }

            catch

            {

            }

        }



        private void richTextBox1_TextChanged(object sender, EventArgs e)

        {

            InitializeArr();

        }