C#模仿Windows可折叠导航栏

代码文件介绍

NavBar.cs                  导航栏主体，继承自 Panel
NavGroup.cs            NavBar中的分组，即（控制面板，我的电脑等），继承自Control
NavBarItem.cs         分组中的小项（即区域选项，字体等），继承自Control
NavBarButton.cs     导航栏主体右边的圆形按钮
NavGroupCollection.cs      分组的集合
NavBarItemCollection.cs   分组中小项的集合
NavGroupState.cs   组的状态，收缩还是展开

NavBar.cs
[csharp]
using System; 
using System.Collections.Generic; 
using System.Drawing.Design; 
using System.ComponentModel.Design; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
 
namespace WindowsApplication1 
{ 
    public partial class NavBar : Panel 
    { 
        private NavGroupCollection _groups; 
        public NavGroupCollection Groups 
        { 
            get { return this._groups; } 
        } 
        public NavGroup this[int index] 
        { 
            get 
            { 
                if (index > -1) 
                    return this._groups[index]; 
                else 
                    return null; 
            } 
        } 
        private int _selectedIndex = -1; 
        /// <summary> 
        /// 选择组的索引 
        /// </summary> 
        [DefaultValue(-1)] 
        public int SelectedIndex 
        { 
            get { return this._selectedIndex; } 
            set  
            {  
                this._selectedIndex = value; 
                this.SelectGroup(value); 
            } 
        } 
        private int _groupSpace = 20; 
        /// <summary> 
        /// Group间距 
        /// </summary> 
        public int GroupSpace 
        { 
            get { return this._groupSpace; } 
            set { this._groupSpace = value; } 
        } 
        private int _groupMargin = 5; 
        /// <summary> 
        /// Group边距 
        /// </summary> 
        public int GroupMargin 
        { 
            get { return this._groupMargin; } 
            set { this._groupMargin = value; } 
        } 
        private ImageList _smallImageList; 
        /// <summary> 
        /// 设置图像列表 
        /// </summary> 
        public ImageList SmallImageList 
        { 
            get { return this._smallImageList; } 
            set { this._smallImageList = value; } 
        } 
        public NavBar() 
        { 
            InitializeComponent(); 
             
            this.BackColor = Color.FromArgb(112, 140, 225); 
            this._groups = new NavGroupCollection(this); 
            this.AutoScroll = true; 
        } 
        /// <summary> 
        /// 根据添加的项，布局 
        /// </summary> 
        /// <param name="item"></param> 
        public void SetLayOut(NavGroup item) 
        { 
            this.SuspendLayout(); 
            this.Controls.Add(item); 
            if (this._groups.Count =

补充：软件开发 , C# ,

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