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

namespace jishiben
{
    public delegate void gotoEventHandler(object sender, int gotocharline);
    public partial class Editgoto : Form
    {
        public event gotoEventHandler gotol;
        private int charline = 0;
        private void Ongotol()
        {
            gotoEventHandler handler = gotol;
            
            if (handler != null)
            {

                if (handler.Target is System.ComponentModel.ISynchronizeInvoke)
                {
                    System.ComponentModel.ISynchronizeInvoke aSynch = handler.Target as System.ComponentModel.ISynchronizeInvoke;
                    if (aSynch.InvokeRequired)
                    {
                        object[] args = new object[] { this, charline };
                        aSynch.Invoke(handler, args);
                    }
                    else
                    {
                        handler(this, charline);
                    }
                }
                else
                {

                    handler(this, charline);
                }
            }
            else
            {
                MessageBox.Show("事件為空!");
            }

        }
        public Editgoto()
        {
            InitializeComponent();
        }

        private void btnNo_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnOk_Click(object sender, EventArgs e)
        {
            foreach (char c in tBline.Text)
            {
                int i = (int)c;
                if (i < 0x30 || i > 0x39)
                {
                    MessageBox.Show("請(qǐng)輸入正整數(shù)");
                }
                else
                { 
                    int gotoline = Convert.ToInt32(tBline.Text);
                    int maxline = jishiben.Lines.Length;
                    if (gotoline > 0 && gotoline <= maxline)
                    {
                        for (int j = gotoline-1; j > 0; j--)
                        {
                            //jishiben.Selects += jishiben.Lines[j].Length + 1;
                            charline += jishiben.Lines[j - 1].Length + 1;
                            Ongotol();
                            this.Close();
                        }
                    }
                    else
                    {
                        MessageBox.Show("輸入數(shù)字1到" + maxline + "之間的數(shù)字");
                        break;
                    }
                }
            }
        }

        private void Editgoto_Load(object sender, EventArgs e)
        {
            int j = jishiben.Selects;
            for (int i = 0; i < jishiben.Lines.Length;i++ )
            {   
                j = j - (jishiben.Lines[i].Length+1);
                if (j <= 0)
                {
                    tBline.Text = (i+1).ToString();
                    break;
                }
            }
        }
    }
}