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c# 兩個TextBox 同步滾動實現(xiàn)行號功能

using System;
2

using System.Collections.Generic;
3

using System.ComponentModel;
4

using System.Data;
5

using System.Drawing;
6

using System.Text;
7

using System.Windows.Forms;
8

namespace VSGround
10

{
11

public partial class Form1 : Form
12

{
13

public Form1()
14

{
15

InitializeComponent();
16

}
17

private void Form1_Load(object sender, EventArgs e)
19

{
20

txtInput.Focus();
21

//txt2.TabIndex = 0;
22

}
23

private int GetRNCount(String str)
24

{
25

int RNnum = 0;
26

for(int i = 0; i<str.Length; i++)
27

{
28

if (str[i] == '\r')
29

{
30

RNnum++;
31

}
32

}
33

return RNnum;
34

}
35

//根據(jù)行號確定光標(biāo)索引
36

private int GetCurIndex(int curRow)
37

{
38

int curIndex = 0;
39

if (curRow < 10)
40

{
41

curIndex = 3 * (curRow - 1);
42

}
43

else if (curRow < 100)
44

{
45

curIndex = (10 - 1) * 3 + (curRow - 10) * 4;
46

}
47

else if (curRow < 1000)
48

{
49

curIndex = (10 - 1) * 3 + (100-1) * 4 + (curRow - 100)*5;
50

}
51

else if (curRow < 10000)
52

{
53

curIndex = (10 - 1) * 3 + (100 - 1) * 4 + (1000 - 1) * 5 + (curRow - 1000) * 6;
54

}
55

else
56

{
57

curIndex = (10 - 1) * 3 + (100 - 1) * 4 + (1000 - 1) * 5 + (10000 - 1) * 6 + (curRow - 10000) * 7;
58

}
59

return curIndex;
60

}
61

private void txtInput_TextChanged(object sender, EventArgs e)
62

{
63

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
68

String str = txtInput.Text;
69

if (str != null && str.Length > 0)
70

{
71

int countRN = GetRNCount(str);
72

for(int j = 0; j < countRN+1; j++)
73

{
74

txtLeft.Text += (j + 1).ToString();
75

txtLeft.Text += "\r\n";
76

}
77

txtLeft.Text = txtLeft.Text.Substring(0, txtLeft.Text.Length - 2);
78

}
80

//定位光標(biāo)所在行號取其前面的子串
81

int careIndex = txtInput.SelectionStart;
82

String careFrontStr = txtInput.Text.Substring(0, careIndex);
83

//分析子串有幾個回車換行符
84

int countSubRN = GetRNCount(careFrontStr);
85

int CurRow = countSubRN + 1;
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txtLeft.SelectionStart = GetCurIndex(CurRow);
87

txtLeft.ScrollToCaret();
88

}
89

private void txtInput_KeyDown(object sender, KeyEventArgs e)
91

{
92

txtInput.ScrollToCaret();
93

if(e.KeyCode == Keys.Up)
94

{
95

//定位光標(biāo)所在行號取其前面的子串
96

int careIndex = txtInput.SelectionStart;
97

String careFrontStr = txtInput.Text.Substring(0, careIndex);
98

//分析子串有幾個回車換行符
99

int countSubRN = GetRNCount(careFrontStr);
100

int CurRow = countSubRN ;
101

if(CurRow != 0)
102

{
103

txtLeft.SelectionStart = GetCurIndex(CurRow);
104

}
105

else
106

{
107

txtLeft.SelectionStart = GetCurIndex(CurRow+1);
108

}
109

110

txtLeft.ScrollToCaret();
111

}
112

else if(e.KeyCode == Keys.Down)
113

{
114

//定位光標(biāo)所在行號取其前面的子串
115

int careIndex = txtInput.SelectionStart;
116

String careFrontStr = txtInput.Text.Substring(0, careIndex);
117

//分析子串有幾個回車換行符
118

int countSubRN = GetRNCount(careFrontStr);
119

int CurRow = countSubRN ;
120

txtLeft.SelectionStart = GetCurIndex(CurRow + 2);
121

txtLeft.ScrollToCaret();
122

}
123

}
124

}
125

}

using System;
2

using System.Collections.Generic;
3

using System.Windows.Forms;
4

using System.Text;
5

namespace VSGround
7

{
8

class MyTextBox:System.Windows.Forms.TextBox
9

{
10

public MyTextBox():base()
11

{
12

}
14

protected override bool IsInputKey(System.Windows.Forms.Keys KeyData)
15

{
16

if (KeyData == System.Windows.Forms.Keys.Up ||
17

KeyData == System.Windows.Forms.Keys.Down)
18

return true;
19

return base.IsInputKey(KeyData);
20

}
21

}
22

}

posted on 2008-09-12 16:52 天書閱讀(2180) 評論(1) 編輯收藏引用

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