WPF 无边框窗体改变大小和移动

WIN32 API:

 

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private const int WM_NCHITTEST = 0x0084;      private readonly int agWidth = 12; //拐角宽度      private readonly int bThickness = 4; // 边框宽度      private Point mousePoint = new Point(); //鼠标坐标      public enum HitTest : int      {          HTERROR = -2,          HTTRANSPARENT = -1,          HTNOWHERE = 0,          HTCLIENT = 1,          HTCAPTION = 2,          HTSYSMENU = 3,          HTGROWBOX = 4,          HTSIZE = HTGROWBOX,          HTMENU = 5,          HTHSCROLL = 6,          HTVSCROLL = 7,          HTMINBUTTON = 8,          HTMAXBUTTON = 9,          HTLEFT = 10,          HTRIGHT = 11,          HTTOP = 12,          HTTOPLEFT = 13,          HTTOPRIGHT = 14,          HTBOTTOM = 15,          HTBOTTOMLEFT = 16,          HTBOTTOMRIGHT = 17,          HTBORDER = 18,          HTREDUCE = HTMINBUTTON,          HTZOOM = HTMAXBUTTON,          HTSIZEFIRST = HTLEFT,          HTSIZELAST = HTBOTTOMRIGHT,          HTOBJECT = 19,          HTCLOSE = 20,          HTHELP = 21,      }        protected override void OnSourceInitialized(EventArgs e)      {          base.OnSourceInitialized(e);          HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;          if (hwndSource != null)          {              hwndSource.AddHook(new HwndSourceHook(this.WndProc));          }      }      protected virtual IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)      {          switch (msg)          {              case WM_NCHITTEST:                  this.mousePoint.X = (lParam.ToInt32() & 0xFFFF);                  this.mousePoint.Y = (lParam.ToInt32() >> 16);                      #region 测试鼠标位置                    // 窗口左上角                  if (this.mousePoint.Y - this.Top <= this.agWidth                     && this.mousePoint.X - this.Left <= this.agWidth)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTTOPLEFT);                  }                  // 窗口左下角                     else if (this.ActualHeight + this.Top - this.mousePoint.Y <= this.agWidth                     && this.mousePoint.X - this.Left <= this.agWidth)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTBOTTOMLEFT);                  }                  // 窗口右上角                  else if (this.mousePoint.Y - this.Top <= this.agWidth                     && this.ActualWidth + this.Left - this.mousePoint.X <= this.agWidth)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTTOPRIGHT);                  }                  // 窗口右下角                  else if (this.ActualWidth + this.Left - this.mousePoint.X <= this.agWidth                     && this.ActualHeight + this.Top - this.mousePoint.Y <= this.agWidth)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTBOTTOMRIGHT);                  }                  // 窗口左侧                  else if (this.mousePoint.X - this.Left <= this.bThickness)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTLEFT);                  }                  // 窗口右侧                  else if (this.ActualWidth + this.Left - this.mousePoint.X <= this.bThickness)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTRIGHT);                  }                  // 窗口上方                  else if (this.mousePoint.Y - this.Top <= this.bThickness)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTTOP);                  }                  // 窗口下方                  else if (this.ActualHeight + this.Top - this.mousePoint.Y <= this.bThickness)                  {                      handled = true;                      return new IntPtr((int)HitTest.HTBOTTOM);                  }                  else // 窗口移动                  {                      handled = true;                      return new IntPtr((int)HitTest.HTCAPTION);                  }                  #endregion          }          return IntPtr.Zero;      }