sourcecodechildform.cs

本软件是针对PL/x语法结构设计的PL/x编译器

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

namespace PLX
{
    public partial class SourceCodeChildForm : Form
    {
         public SourceCodeChildForm()
        {
            InitializeComponent();
        }

        private void rtxtSourceCode_KeyPress(object sender, KeyPressEventArgs e)
        {
             //判读回车符，增加行号
            if (e.KeyChar == 13)
            {
                ChangeLineNum();
            }

            //判断Delete，Backspace，减少行号
            if (e.KeyChar == 46 || e.KeyChar == 8)
            {
                ChangeLineNum();
            }
        }

        private void ChangeLineNum()
        {
            //Get first LineNum of current textbox
            Point pos = new Point(0,rtxtSourceCode.Font.Height);
            int firstIndex = rtxtSourceCode.GetCharIndexFromPosition(pos);
            int firstLineNum = rtxtSourceCode.GetLineFromCharIndex(firstIndex) + 1;

            //Get last lineNum of current textbox
            pos.X = ClientRectangle.Width;
            pos.Y = ClientRectangle.Height;
            int lastIndex = rtxtSourceCode.GetCharIndexFromPosition(pos);
            int lastLineNum = rtxtSourceCode.GetLineFromCharIndex(lastIndex) + 1;

            Form1.BuildLineNum(firstLineNum , lastLineNum);
        }

        private void rtxtSourceCode_TextChanged(object sender, EventArgs e)
        {
            ChangeLineNum();
        }

        private void rtxtSourceCode_VScroll(object sender, EventArgs e)
        {
            ChangeLineNum();
        }

    }
}