基于C#实现的仿windows左侧伸缩菜单效果

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;
using System.Runtime.InteropServices;
namespace LikesXP
{
  public partial class Frm_Main : Form
  {
    public Frm_Main()
    {
      InitializeComponent();
    }
    private static Panel Var_Panel = new Panel();//创建静态字段
    private static PictureBox Var_Pict = //创建静态字段
      new PictureBox();
    private static int Var_i = 0;//创建静态字段
    private Font Var_Font = new Font("宋体", 9); //创建字体字段
    private void pictureBox_1_Click(object sender, EventArgs e)
    {
      Var_i = Convert.ToInt16((//得到控件中的数据
        (PictureBox)sender).Tag.ToString());
      switch (Var_i)
      {
        case 1:
          {
            Var_Panel = panel_Gut_1;//得到面板对象引用
            //Var_Pict = pictureBox_1;//得到PictureBox对象引用
            break;
          }
        case 2:
          {
            Var_Panel = panel_Gut_2;//得到面板对象引用
            Var_Pict = pictureBox_2;//得到PictureBox对象引用
            break;
          }
        case 3:
          {
            Var_Panel = panel_Gut_3;//得到面板对象引用
            Var_Pict = pictureBox_3;//得到PictureBox对象引用
            break;
          }
      }
      if (Convert.ToInt16(Var_Panel.Tag.ToString()) == 0 || Convert.ToInt16(Var_Panel.Tag.ToString()) == 2)
      {
        Var_Panel.Tag = 1;//设置为隐藏标识
        Var_Pict.Image = Properties.Resources.朝下按钮;//设置图像属性
        Var_Panel.Visible = false;//隐藏面板
      }
      else
      {
        if (Convert.ToInt16(Var_Panel.Tag.ToString()) == 1)
        {
          Var_Panel.Tag = 2;//设置为显示标识
          Var_Pict.Image = Properties.Resources.朝上按钮;//设置图像属性
          Var_Panel.Visible = true;//显示面板
        }
      }
    }
    private void Form1_Load(object sender, EventArgs e)
    {
      //pictureBox_1.Image = Properties.Resources.朝上按钮;//设置图像信息
      pictureBox_2.Image = Properties.Resources.朝上按钮;//设置图像信息
      pictureBox_3.Image = Properties.Resources.朝上按钮;//设置图像信息
      Var_Font = label_1.Font;//得到字体对象
    }
    private void label_1_MouseEnter(object sender, EventArgs e)
    {
      ((Label)sender).ForeColor = Color.Gray;//设置控件文字字颜色
      ((Label)sender).Font = //设置控件字体
        new Font(Var_Font, Var_Font.Style | FontStyle.Underline);
    }
    private void label_1_MouseLeave(object sender, EventArgs e)
    {
      ((Label)sender).ForeColor = Color.Black;//设置控件文字颜色
      ((Label)sender).Font = //设置控件字体
        new Font(Var_Font, Var_Font.Style);
    }
    private void pictureBox1_Click(object sender, EventArgs e)
    {
      if (Convert.ToInt16(panel1.Tag.ToString()) == 1)
      {
        timer1.Start();
        Convert.ToDateTime("").ToShortDateString();
        // pictureBox1.Image = Properties.Resources.朝下按钮;//设置图像属性
        //panel1.Visible = false;//隐藏面板
      }
      else
      {
        if (Convert.ToInt16(panel1.Tag.ToString()) == 0)
        {
          timer1.Start();
          //panel1.Tag = 1;//设置为显示标识
          //pictureBox1.Image = Properties.Resources.朝上按钮;//设置图像属性
          //panel1.Visible = true;//显示面板
        }
      }
    }
    private void timer1_Tick(object sender, EventArgs e)
    {
      long longWidth = panel1.Width;
      //如果panel目前是隐藏的
      if (Convert.ToInt16(panel1.Tag.ToString()) == 0)
      {
        if (longWidth == 200)
        {
          timer1.Enabled = false;
          panel1.Tag = 1;//设置为显示标识
        }
        else
        {
          panel1.Width += 10;
        }
      }
      //如果panel目前是显示的
      if (Convert.ToInt16(panel1.Tag.ToString()) == 1)
      {
        if (longWidth == 0)
        {
          timer1.Enabled = false;
          panel1.Tag = 0;//设置为隐藏标识
        }
        else
        {
          panel1.Width -= 10;
        }
      }
    }
  }
}