Winform无边框窗口拖动及改变窗口大小

Winform无边框窗口（FormBorderStyle属性为None）默认是不可以拖动或者改变大小的。

1.      拖动无边框窗口改变位置

方法1：通过mousedown、mousemove、mouseup、事件来改变窗口Location。

方法2：通过截获消息，进行处理，见下面代码后半部分。

2.      改变窗口大小

通过重写窗口消息处理函数，截获相关信息，并进行处理。

代码：

const int HTLEFT = 10;

const int HTRIGHT = 11;

const int HTTOP = 12;

const int HTTOPLEFT = 13;

const int HTTOPRIGHT = 14;

const int HTBOTTOM = 15;

const int HTBOTTOMLEFT = 0x10;

const int HTBOTTOMRIGHT = 17;

protected override voidWndProc(ref Messagem)

{

    switch (m.Msg)

    {

        case 0x0084:

         base.WndProc(refm);

         Point vPoint = newPoint((int)m.LParam& 0xFFFF,

                        (int)m.LParam >> 16 & 0xFFFF);

         vPoint = PointToClient(vPoint);

         if (vPoint.X <= 5)

             if(vPoint.Y <= 5)

                    m.Result = (IntPtr)HTTOPLEFT;

             elseif (vPoint.Y >= ClientSize.Height - 5)

                   m.Result = (IntPtr)HTBOTTOMLEFT;

              else m.Result = (IntPtr)HTLEFT;

           elseif (vPoint.X >= ClientSize.Width - 5)

               if(vPoint.Y <= 5)

                    m.Result = (IntPtr)HTTOPRIGHT;

               elseif (vPoint.Y >= ClientSize.Height - 5)

                     m.Result = (IntPtr)HTBOTTOMRIGHT;

                else m.Result= (IntPtr)HTRIGHT;

             elseif (vPoint.Y <= 5)

                  m.Result = (IntPtr)HTTOP;

             elseif (vPoint.Y >= ClientSize.Height - 5)

                   m.Result = (IntPtr)HTBOTTOM;

             break;

        case 0x0201://鼠标左键按下的消息 用于实现拖动窗口功能

               m.Msg = 0x00A1;//更改消息为非客户区按下鼠标

               m.LParam = IntPtr.Zero;//默认值

                 m.WParam = new IntPtr(2);//鼠标放在标题栏内

                 base.WndProc(ref m);

                 break;

             default:

                 base.WndProc(ref m);

                 break;

            }

       }