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c# 兩個TextBox 同步滾動實現(xiàn)行號功能

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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Text;
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using System.Windows.Forms;
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namespace VSGround
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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}
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private void Form1_Load(object sender, EventArgs e)
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{
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txtInput.Focus();
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//txt2.TabIndex = 0;
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}
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private int GetRNCount(String str)
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{
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int RNnum = 0;
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for(int i = 0; i<str.Length; i++)
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{
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if (str[i] == '\r')
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{
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RNnum++;
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}
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}
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return RNnum;
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}
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//根據(jù)行號確定光標索引
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private int GetCurIndex(int curRow)
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{
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int curIndex = 0;
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if (curRow < 10)
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{
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curIndex = 3 * (curRow - 1);
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}
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else if (curRow < 100)
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{
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curIndex = (10 - 1) * 3 + (curRow - 10) * 4;
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}
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else if (curRow < 1000)
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{
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curIndex = (10 - 1) * 3 + (100-1) * 4 + (curRow - 100)*5;
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}
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else if (curRow < 10000)
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{
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curIndex = (10 - 1) * 3 + (100 - 1) * 4 + (1000 - 1) * 5 + (curRow - 1000) * 6;
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}
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else
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{
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curIndex = (10 - 1) * 3 + (100 - 1) * 4 + (1000 - 1) * 5 + (10000 - 1) * 6 + (curRow - 10000) * 7;
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}
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return curIndex;
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}
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private void txtInput_TextChanged(object sender, EventArgs e)
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{
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txtLeft.Clear();
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//兩個textbox中的滾動條保持同步
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txtInput.ScrollToCaret();
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//定位總行號
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String str = txtInput.Text;
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if (str != null && str.Length > 0)
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{
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int countRN = GetRNCount(str);
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for(int j = 0; j < countRN+1; j++)
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{
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txtLeft.Text += (j + 1).ToString();
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txtLeft.Text += "\r\n";
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}
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txtLeft.Text = txtLeft.Text.Substring(0, txtLeft.Text.Length - 2);
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}
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//定位光標所在行號取其前面的子串
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int careIndex = txtInput.SelectionStart;
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String careFrontStr = txtInput.Text.Substring(0, careIndex);
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//分析子串有幾個回車換行符
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int countSubRN = GetRNCount(careFrontStr);
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int CurRow = countSubRN + 1;
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txtLeft.SelectionStart = GetCurIndex(CurRow);
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txtLeft.ScrollToCaret();
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}
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private void txtInput_KeyDown(object sender, KeyEventArgs e)
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{
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txtInput.ScrollToCaret();
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if(e.KeyCode == Keys.Up)
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{
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//定位光標所在行號取其前面的子串
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int careIndex = txtInput.SelectionStart;
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String careFrontStr = txtInput.Text.Substring(0, careIndex);
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//分析子串有幾個回車換行符
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int countSubRN = GetRNCount(careFrontStr);
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int CurRow = countSubRN ;
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if(CurRow != 0)
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{
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txtLeft.SelectionStart = GetCurIndex(CurRow);
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}
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else
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{
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txtLeft.SelectionStart = GetCurIndex(CurRow+1);
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}
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txtLeft.ScrollToCaret();
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}
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else if(e.KeyCode == Keys.Down)
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{
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//定位光標所在行號取其前面的子串
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int careIndex = txtInput.SelectionStart;
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String careFrontStr = txtInput.Text.Substring(0, careIndex);
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//分析子串有幾個回車換行符
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int countSubRN = GetRNCount(careFrontStr);
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int CurRow = countSubRN ;
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txtLeft.SelectionStart = GetCurIndex(CurRow + 2);
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txtLeft.ScrollToCaret();
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}
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}
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}
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}

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using System;
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using System.Collections.Generic;
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using System.Windows.Forms;
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using System.Text;
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namespace VSGround
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{
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class MyTextBox:System.Windows.Forms.TextBox
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{
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public MyTextBox():base()
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{
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}
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protected override bool IsInputKey(System.Windows.Forms.Keys KeyData)
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{
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if (KeyData == System.Windows.Forms.Keys.Up ||
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KeyData == System.Windows.Forms.Keys.Down)
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return true;
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return base.IsInputKey(KeyData);
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}
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}
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}

posted on 2008-09-12 16:52 天書閱讀(2191) 評論(1) 編輯收藏引用

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# re: c# 兩個TextBox 同步滾動實現(xiàn)行號功能

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