winform鼠标滚轮事件

 1 #region 进入窗体时加载
 2 
 3 public FormAlarmInfoQuery()
 4 {
 5     InitializeComponent();
 6     pictureBox1.ImageLocation = "f:\\1.jpg";
 7 
 8          this.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);
 9          //判断是否已安装带滚轮的鼠标
10     //SystemInformation.MouseWheelPresent.ToString();
11     //获取鼠标滚轮在滚动时所获得的行数
12     //SystemInformation.MouseWheelScrollLines.ToString();
13     //判断该操作系统是否支持滚轮鼠标
14     //SystemInformation.NativeMouseWheelSupport.ToString(); 
15 }
16 
17 #endregion

1 private void panel1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
2 {
3     MessageBox.Show("滚动事件已被捕捉");
4     System.Drawing.Size t = pictureBox1.Size;
5     t.Width += e.Delta;
6     t.Height += e.Delta;
7     pictureBox1.Width = t.Width;
8     pictureBox1.Height = t.Height;
9 }

 1         public Form1()
 2         {
 3             InitializeComponent();
 4             this.btnjin.MouseWheel += new MouseEventHandler(btnjin_MouseWheel);
 5 
 6         }
 7         int m1=30;
 8         private void btnjin_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e) 
 9         {
10             if(m1>=0&&m1<=100)
11             {
12                 m1 += e.Delta / 24;
13                 if (m1 > 100)
14                 {
15                     m1 = 100;
16                 }
17                 else if (m1 < 0)
18                 {
19                     m1 = 0;
20                 }
21                 lblvol.Width = (60 / 20) * m1 / 5;
22                 Music.settings.volume = m1 ;
23             }
24             
25 
26         }
27 
28         private void btnjin_MouseEnter(object sender, EventArgs e)
29         {
30             panel2.Visible = true;
31         }
32 
33         private void btnjin_MouseLeave(object sender, EventArgs e)
34         {
35             panel2.Visible = false;
36         }