(转)c#中WinForm的TextBox循环自动滚动

梦里梦外; 2022-08-23 12:51 350阅读 0赞

本文转自：[http://blog.163.com/huang\_ying\_lu/blog/static/2699983200842075754508/][http_blog.163.com_huang_ying_lu_blog_static_2699983200842075754508]

using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Text;  
using System.Windows.Forms;  
using System.Runtime.InteropServices;  
namespace WindowsApplication27  
\{  
/// <summary>  
/// 演示如何在TextBox中让文字循环滚动:  
/// </summary>  
public partial class Form1 : Form  
\{  
public Form1()  
\{  
InitializeComponent();

this.textBox1.Clear();  
for (int i = 0; i <= 20;i++ )  
\{  
this.textBox1.Text += string.Format("\{0\}:jinjazz\_\_\{1\} ", i,i);  
\}  
this.timer1.Interval = 200;  
this.timer1.Start();  
\}

//发送消息  
\[DllImport("user32.dll", EntryPoint = "SendMessage")\]  
public static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);  
//获取滚动条位置  
\[DllImport("user32")\]  
public static extern int GetScrollPos(IntPtr hwnd, int nBar);  
//设置滚动条位置  
\[DllImport("user32.dll")\]  
static extern int SetScrollPos(IntPtr hWnd, int nBar,  
int nPos, bool bRedraw);

public const int EM\_LINESCROLL = 0xb6;  
  
private void timer1\_Tick(object sender, EventArgs e)  
\{  
int i= GetScrollPos(this.textBox1.Handle,1);

//向下滚动一行  
SendMessage(this.textBox1.Handle, EM\_LINESCROLL, 0, 1);//0，1代表垂直滚动条向下滚动

//判断是否有位置变化，如果没有则说明到了底部，返回开始处  
if (i == GetScrollPos(this.textBox1.Handle, 1))  
\{  
//回到顶部，这里用SetScrollPos似乎有问题，滚动条和文字不是同步更新  
this.textBox1.SelectionStart = 0;  
this.textBox1.SelectionLength = 1;  
this.textBox1.ScrollToCaret();  
this.textBox1.SelectionLength = 0;  
\}  
Console.WriteLine(i);  
\}

private void textBox1\_MouseEnter(object sender, EventArgs e)  
\{  
this.timer1.Stop();  
\}

private void textBox1\_MouseLeave(object sender, EventArgs e)  
\{  
this.timer1.Start();  
\}  
\}  
\}

[http_blog.163.com_huang_ying_lu_blog_static_2699983200842075754508]: http://blog.163.com/huang_ying_lu/blog/static/2699983200842075754508/