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;        }      }    }  }}