fixed #325

src/Shared/HandyControl_Shared/Tools/Helper/WindowHelper.cs

@@ -132,15 +132,17 @@ namespace HandyControl.Tools
         {
             get
             {
+                InteropValues.APPBARDATA appBarData = default;
+                var autoHide = InteropMethods.SHAppBarMessage(4, ref appBarData) != 0;
 #if netle40
-                return WindowResizeBorderThickness;
+                return WindowResizeBorderThickness.Add(new Thickness(autoHide ? -8 : 0));
 #elif Core
                 var hdc = InteropMethods.GetDC(IntPtr.Zero);
                 var scale = InteropMethods.GetDeviceCaps(hdc, InteropValues.DESKTOPVERTRES) / (float)InteropMethods.GetDeviceCaps(hdc, InteropValues.VERTRES);
                 InteropMethods.ReleaseDC(IntPtr.Zero, hdc);
-                return WindowResizeBorderThickness.Add(new Thickness(4 * scale));
+                return WindowResizeBorderThickness.Add(new Thickness((autoHide ? - 4 : 4) * scale));
 #else
-                return WindowResizeBorderThickness.Add(new Thickness(4));
+                return WindowResizeBorderThickness.Add(new Thickness(autoHide ? - 4 : 4));
 #endif
             }
         }

src/Shared/HandyControl_Shared/Tools/Interop/InteropMethods.cs

@@ -17,7 +17,7 @@ namespace HandyControl.Tools.Interop
     {
         #region common
 
-        public const int E_FAIL = unchecked((int)0x80004005);
+        internal const int E_FAIL = unchecked((int)0x80004005);
 
         internal static readonly IntPtr HRGN_NONE = new IntPtr(-1);
 
@@ -461,7 +461,10 @@ namespace HandyControl.Tools.Interop
 
         [ReflectionPermission(SecurityAction.Assert, Unrestricted = true),
          SecurityPermission(SecurityAction.Assert, Flags = SecurityPermissionFlag.UnmanagedCode)]
-        public static void PtrToStructure(IntPtr lparam, object data) => Marshal.PtrToStructure(lparam, data);
+        internal static void PtrToStructure(IntPtr lparam, object data) => Marshal.PtrToStructure(lparam, data);
+
+        [DllImport(InteropValues.ExternDll.Shell32, CallingConvention = CallingConvention.StdCall)]
+        internal static extern uint SHAppBarMessage(int dwMessage, ref InteropValues.APPBARDATA pData);
 
         #endregion
 

src/Shared/HandyControl_Shared/Tools/Interop/InteropValues.cs

@@ -48,6 +48,7 @@ namespace HandyControl.Tools.Interop
             NIIF_ERROR = 0x00000003,
             WM_ACTIVATE = 0x0006,
             WM_QUIT = 0x0012,
+            WM_GETMINMAXINFO = 0x0024,
             WM_WINDOWPOSCHANGING = 0x0046,
             WM_WINDOWPOSCHANGED = 0x0047,
             WM_SETICON = 0x0080,
@@ -85,7 +86,8 @@ namespace HandyControl.Tools.Interop
             SC_MINIMIZE = 0xF020,
             SC_MAXIMIZE = 0xF030,
             SC_RESTORE = 0xF120,
-            SRCCOPY = 0x00CC0020;
+            SRCCOPY = 0x00CC0020,
+            MONITOR_DEFAULTTONEAREST = 0x00000002;
 
         [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
         internal class NOTIFYICONDATA
@@ -933,5 +935,26 @@ namespace HandyControl.Tools.Interop
                 return length;
             }
         }
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal class MINMAXINFO
+        {
+            public POINT ptReserved;
+            public POINT ptMaxSize;
+            public POINT ptMaxPosition;
+            public POINT ptMinTrackSize;
+            public POINT ptMaxTrackSize;
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct APPBARDATA
+        {
+            public int cbSize;
+            public IntPtr hWnd;
+            public uint uCallbackMessage;
+            public uint uEdge;
+            public RECT rc;
+            public int lParam;
+        }
     }
 }