winform 控件拖动和改变大小的例子

要实现界面上控件的可调整大小和位置可以用下面的代码实现，主要是对Panel控件进行了一点改造，应该也适用于其他容器控件。

欢迎大家到我的网站去下载实例。如果有什么不对的地方，请大家指正。

主要的思路是在容器内为所有的控件添加MouseDown,MouseLeave,MouseMove三个事件，在MouseLeave事件中保存对控件位置和大小的修改，保存到XML文件中，程序启动时会调用XML文件内的控件属性，以此来实现该功能。

完整的示例下载

下面是Panel类代码。

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public partial class PanelEx :Panel    {        /// <summary>        /// 光标状态        /// </summary>        private enum EnumMousePointPosition        {            MouseSizeNone = 0, //'无              MouseSizeRight = 1, //'拉伸右边框              MouseSizeLeft = 2, //'拉伸左边框              MouseSizeBottom = 3, //'拉伸下边框              MouseSizeTop = 4, //'拉伸上边框              MouseSizeTopLeft = 5, //'拉伸左上角              MouseSizeTopRight = 6, //'拉伸右上角              MouseSizeBottomLeft = 7, //'拉伸左下角              MouseSizeBottomRight = 8, //'拉伸右下角              MouseDrag = 9   // '鼠标拖动          }        #region 属性        private static string xmlDocPath = "";        private XmlDocument doc;        private const int Band = 5;        private const int MinWidth = 10;        private const int MinHeight = 10;        private EnumMousePointPosition m_MousePointPosition;        private Point p, p1;        #endregion        public PanelEx()        {                       InitializeComponent();                  }          #region 改变控件大小和移动位置用到的方法                                  private void MyMouseDown(object sender, System.Windows.Forms.MouseEventArgs e)        {            p.X = e.X;            p.Y = e.Y;            p1.X = e.X;            p1.Y = e.Y;        }        /// <summary>        /// 鼠标离开事件需要改进        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void MyMouseLeave(object sender, EventArgs e)        {            Control s = (Control)sender;              SaveStyle(s);              m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;            this.Cursor = Cursors.Arrow;        }        private void SaveStyle(Control s)        {            XmlNodeList nodes = doc.GetElementsByTagName(s.Name);            XmlElement xn;            if (nodes.Count != 1)            {                xn = doc.CreateElement(s.Name);            }            else            {                xn = (XmlElement)doc.GetElementsByTagName(s.Name)[0];            }            if (s.Top < 0 || s.Top > this.Height - s.Top)                s.Top = 0;            xn.SetAttribute("Top", s.Top.ToString());            if (s.Left < 0 || s.Left > this.Width - s.Left)                s.Left = 0;            xn.SetAttribute("Left", s.Left.ToString());            if (s.Width + s.Left > this.Width)                s.Width = this.Width - s.Left;            xn.SetAttribute("Width", s.Width.ToString());            if (s.Height + s.Top > this.Height)                s.Height = this.Height - s.Top;            xn.SetAttribute("Height", s.Height.ToString());                XmlNodeList xnl = doc.GetElementsByTagName(this.Name);            XmlElement xnp;            if (xnl.Count < 1)            {                xnp = doc.CreateElement(this.Name);            }            else            {                xnp = (XmlElement)xnl[0];            }            xnp.AppendChild((XmlNode)xn);            doc.DocumentElement.AppendChild((XmlNode)xnp);            doc.Save(xmlDocPath);        }        private EnumMousePointPosition MousePointPosition(Size size, System.Windows.Forms.MouseEventArgs e)        {              if ((e.X >= -1 * Band) | (e.X <= size.Width) | (e.Y >= -1 * Band) | (e.Y <= size.Height))            {                if (e.X < Band)                {                    if (e.Y < Band) { return EnumMousePointPosition.MouseSizeTopLeft; }                    else                    {                        if (e.Y > -1 * Band + size.Height)                        { return EnumMousePointPosition.MouseSizeBottomLeft; }                        else                        { return EnumMousePointPosition.MouseSizeLeft; }                    }                }                else                {                    if (e.X > -1 * Band + size.Width)                    {                        if (e.Y < Band)                        { return EnumMousePointPosition.MouseSizeTopRight; }                        else                        {                            if (e.Y > -1 * Band + size.Height)                            { return EnumMousePointPosition.MouseSizeBottomRight; }                            else                            { return EnumMousePointPosition.MouseSizeRight; }                        }                    }                    else                    {                        if (e.Y < Band)                        { return EnumMousePointPosition.MouseSizeTop; }                        else                        {                            if (e.Y > -1 * Band + size.Height)                            { return EnumMousePointPosition.MouseSizeBottom; }                            else                            { return EnumMousePointPosition.MouseDrag; }                        }                    }                }            }            else            { return EnumMousePointPosition.MouseSizeNone; }        }        private void MyMouseMove(object sender, System.Windows.Forms.MouseEventArgs e)        {            Control lCtrl = (sender as Control);              if (e.Button == MouseButtons.Left)            {                switch (m_MousePointPosition)                {                    case EnumMousePointPosition.MouseDrag:                        lCtrl.Left = lCtrl.Left + e.X - p.X;                        lCtrl.Top = lCtrl.Top + e.Y - p.Y;                        break;                    case EnumMousePointPosition.MouseSizeBottom:                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                          break;                    case EnumMousePointPosition.MouseSizeBottomRight:                        lCtrl.Width = lCtrl.Width + e.X - p1.X;                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                          break;                    case EnumMousePointPosition.MouseSizeRight:                        lCtrl.Width = lCtrl.Width + e.X - p1.X;                        //       lCtrl.Height = lCtrl.Height + e.Y - p1.Y;                          p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                          break;                    case EnumMousePointPosition.MouseSizeTop:                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);                        break;                    case EnumMousePointPosition.MouseSizeLeft:                        lCtrl.Left = lCtrl.Left + e.X - p.X;                        lCtrl.Width = lCtrl.Width - (e.X - p.X);                        break;                    case EnumMousePointPosition.MouseSizeBottomLeft:                        lCtrl.Left = lCtrl.Left + e.X - p.X;                        lCtrl.Width = lCtrl.Width - (e.X - p.X);                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                          break;                    case EnumMousePointPosition.MouseSizeTopRight:                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);                        lCtrl.Width = lCtrl.Width + (e.X - p1.X);                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                          break;                    case EnumMousePointPosition.MouseSizeTopLeft:                        lCtrl.Left = lCtrl.Left + e.X - p.X;                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);                        lCtrl.Width = lCtrl.Width - (e.X - p.X);                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);                        break;                    default:                        break;                }                if (lCtrl.Width < MinWidth) lCtrl.Width = MinWidth;                if (lCtrl.Height < MinHeight) lCtrl.Height = MinHeight;              }            else            {                m_MousePointPosition = MousePointPosition(lCtrl.Size, e);   //'判断光标的位置状态                  switch (m_MousePointPosition)   //'改变光标                  {                    case EnumMousePointPosition.MouseSizeNone:                        this.Cursor = Cursors.Arrow;        //'箭头                          break;                    case EnumMousePointPosition.MouseDrag:                        this.Cursor = Cursors.SizeAll;      //'四方向                          break;                    case EnumMousePointPosition.MouseSizeBottom:                        this.Cursor = Cursors.SizeNS;       //'南北                          break;                    case EnumMousePointPosition.MouseSizeTop:                        this.Cursor = Cursors.SizeNS;       //'南北                          break;                    case EnumMousePointPosition.MouseSizeLeft:                        this.Cursor = Cursors.SizeWE;       //'东西                          break;                    case EnumMousePointPosition.MouseSizeRight:                        this.Cursor = Cursors.SizeWE;       //'东西                          break;                    case EnumMousePointPosition.MouseSizeBottomLeft:                        this.Cursor = Cursors.SizeNESW;     //'东北到南西                          break;                    case EnumMousePointPosition.MouseSizeBottomRight:                        this.Cursor = Cursors.SizeNWSE;     //'东南到西北                          break;                    case EnumMousePointPosition.MouseSizeTopLeft:                        this.Cursor = Cursors.SizeNWSE;     //'东南到西北                          break;                    case EnumMousePointPosition.MouseSizeTopRight:                        this.Cursor = Cursors.SizeNESW;     //'东北到南西                          break;                    default:                        break;                }            }          }            #endregion          #region 初始化鼠标事件委托和控件大小和移动        private void initProperty()        {            for (int i = 0; i < this.Controls.Count; i++)            {                this.Controls[i].MouseDown += new System.Windows.Forms.MouseEventHandler(MyMouseDown);                this.Controls[i].MouseLeave += new System.EventHandler(MyMouseLeave);                this.Controls[i].MouseMove += new System.Windows.Forms.MouseEventHandler(MyMouseMove);            }          }        private void initStyle()        {            Control s;             for (int i = 0; i < this.Controls.Count; i++)            {                s = this.Controls[i];                XmlNodeList nodes = doc.GetElementsByTagName(s.Name);                if (nodes.Count == 1)                {                    XmlAttributeCollection xac = nodes[0].Attributes;                    foreach (XmlAttribute xa in xac)                    {                        if (xa.Value == "")                            continue;                        switch (xa.Name)                        {                            case "Top":                                var Top = Convert.ToInt32(xa.Value);                                s.Top = Top;                                break;                            case "Left":                                var Left = Convert.ToInt32(xa.Value);                                s.Left = Left;                                break;                            case "Width":                                var Width = Convert.ToInt32(xa.Value);                                  s.Width = Width;                                break;                            case "Height":                                var Height = Convert.ToInt32(xa.Value);                                  s.Height = Height;                                break;                            default:                                break;                        }                    }                }                          }                     }        #endregion        /// <summary>        /// 用于实现容器内控件移动和改变大小的方法        /// </summary>        /// <param name="XmlDoc">用于保存控件的属性的XML文档</param>        public void InitMouseAndContolStyle(string XmlDocPath)        {            xmlDocPath = XmlDocPath;            doc = new XmlDocument();            doc.Load(XmlDocPath);            initProperty();            initStyle();        }    }

 

完整的示例下载