WinForm实现拦截窗体上各个部位的点击特效实例

using System; using System.Windows.Forms; namespace WindowsApplication42 {  public partial class Form1 : Form  {   public Form1() { InitializeComponent(); this.Text = "双击左上角图标关闭窗体"; }   //拦击标题栏鼠标位置事件   const int WM_NCHITTEST = 0x84;   protected override void WndProc(ref Message m)   {    base.WndProc(ref m); if (m.Msg == WM_NCHITTEST)    {     switch (m.Result.ToInt32())     {      case 1://客户区       m.Result = new IntPtr(2); break;      case 2://标题栏       m.Result = new IntPtr(1); break;      case 20: m.Result = new IntPtr(0); break;      default: Console.WriteLine(m); break;     }    }   }  } }

{ WM_NCHITTEST and MOUSEHOOKSTRUCT Mouse Position Codes }  {$EXTERNALSYM HTERROR}  HTERROR = -2;  {$EXTERNALSYM HTTRANSPARENT}  HTTRANSPARENT = -1;  {$EXTERNALSYM HTNOWHERE}  HTNOWHERE = 0;  {$EXTERNALSYM HTCLIENT}  HTCLIENT = 1;  {$EXTERNALSYM HTCAPTION}  HTCAPTION = 2;  {$EXTERNALSYM HTSYSMENU}  HTSYSMENU = 3;  {$EXTERNALSYM HTGROWBOX}  HTGROWBOX = 4;  {$EXTERNALSYM HTSIZE}  HTSIZE = HTGROWBOX;  {$EXTERNALSYM HTMENU}  HTMENU = 5;  {$EXTERNALSYM HTHSCROLL}  HTHSCROLL = 6;  {$EXTERNALSYM HTVSCROLL}  HTVSCROLL = 7;  {$EXTERNALSYM HTMINBUTTON}  HTMINBUTTON = 8;  {$EXTERNALSYM HTMAXBUTTON}  HTMAXBUTTON = 9;  {$EXTERNALSYM HTLEFT}  HTLEFT = 10;  {$EXTERNALSYM HTRIGHT}  HTRIGHT = 11;  {$EXTERNALSYM HTTOP}  HTTOP = 12;  {$EXTERNALSYM HTTOPLEFT}  HTTOPLEFT = 13;  {$EXTERNALSYM HTTOPRIGHT}  HTTOPRIGHT = 14;  {$EXTERNALSYM HTBOTTOM}  HTBOTTOM = 15;  {$EXTERNALSYM HTBOTTOMLEFT}  HTBOTTOMLEFT = 16;  {$EXTERNALSYM HTBOTTOMRIGHT}  HTBOTTOMRIGHT = 17;  {$EXTERNALSYM HTBORDER}  HTBORDER = 18;  {$EXTERNALSYM HTREDUCE}  HTREDUCE = HTMINBUTTON;  {$EXTERNALSYM HTZOOM}  HTZOOM = HTMAXBUTTON;  {$EXTERNALSYM HTSIZEFIRST}  HTSIZEFIRST = HTLEFT;  {$EXTERNALSYM HTSIZELAST}  HTSIZELAST = HTBOTTOMRIGHT;  {$EXTERNALSYM HTOBJECT}  HTOBJECT = 19;  {$EXTERNALSYM HTCLOSE}  HTCLOSE = 20;  {$EXTERNALSYM HTHELP}  HTHELP = 21;