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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Case03_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.timer1.Enabled = true;    //计时器可用
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.panel1.Left = this.panel1.Left   10;    
            if (this.panel1.Left > this.Width   10)
            {
                this.panel1.Left = - this.panel1.Width;
            }

        }

        private void pictureBox1_MouseEnter(object sender, EventArgs e)
        {
            timer1.Enabled = false;
        }

        private void pictureBox1_MouseLeave(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

        private void pictureBox2_MouseLeave(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

        private void pictureBox2_MouseEnter(object sender, EventArgs e)
        {
            timer1.Enabled = false;
        }

        private void pictureBox3_MouseEnter(object sender, EventArgs e)
        {
            timer1.Enabled = false;
        }

        private void pictureBox3_MouseLeave(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }
    }
}