fixed #325

src/Net_40/HandyControl_Net_40/Themes/Styles/Window.xaml

@@ -129,7 +129,6 @@
                             <Setter Property="Opacity" Value=".8" TargetName="ButtonPanel"/>
                         </Trigger>
                         <Trigger Property="WindowState" Value="Maximized">
-                            <Setter Property="Padding" Value="{x:Static tools:WindowHelper.WindowMaximizedPadding}"/>
                             <Setter Property="Visibility" Value="Collapsed" TargetName="ButtonMax"/>
                             <Setter Property="Visibility" Value="Visible" TargetName="ButtonRestore"/>
                         </Trigger>

src/Shared/HandyControl_Shared/Controls/Window/GlowWindow.cs

@@ -75,7 +75,7 @@ namespace HandyControl.Controls
             }
         }
 
-        protected virtual IntPtr HwndSourceHook(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        private IntPtr HwndSourceHook(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
         {
             if (msg <= InteropValues.WM_WINDOWPOSCHANGED)
             {
@@ -167,7 +167,7 @@ namespace HandyControl.Controls
 
         protected override void OnSourceInitialized(EventArgs e)
         {
-            var hwndSource = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);
+            var hwndSource = this.GetHwndSource();
             if (hwndSource != null)
             {
                 hwndSource.AddHook(HwndSourceHook);

src/Shared/HandyControl_Shared/Controls/Window/Window.cs

@@ -1,10 +1,13 @@
 using System;
+using System.Runtime.InteropServices;
 using System.Windows;
 using System.Windows.Data;
 using System.Windows.Input;
 using System.Windows.Media;
 using HandyControl.Data;
+using HandyControl.Tools;
 using HandyControl.Tools.Extension;
+using HandyControl.Tools.Interop;
 #if netle40
 using Microsoft.Windows.Shell;
 #else
@@ -80,6 +83,8 @@ namespace HandyControl.Controls
 
         private Thickness _actualBorderThickness;
 
+        private readonly Thickness _commonPadding;
+
         private bool _showNonClientArea = true;
 
         private double _tempNonClientAreaHeight;
@@ -116,10 +121,61 @@ namespace HandyControl.Controls
             BindingOperations.SetBinding(chrome, WindowChrome.CaptionHeightProperty,
                 new Binding(NonClientAreaHeightProperty.Name) { Source = this });
             WindowChrome.SetWindowChrome(this, chrome);
+            _commonPadding = Padding;
 
             Loaded += (s, e) => OnLoaded(e);
         }
 
+        private void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam)
+        {
+            var mmi = (InteropValues.MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(InteropValues.MINMAXINFO));
+            var monitor = InteropMethods.MonitorFromWindow(hwnd, InteropValues.MONITOR_DEFAULTTONEAREST);
+
+            if (monitor != IntPtr.Zero && mmi != null)
+            {
+                InteropValues.APPBARDATA appBarData = default;
+                var autoHide = InteropMethods.SHAppBarMessage(4, ref appBarData) != 0;
+                if (autoHide)
+                {
+                    var monitorInfo = default(InteropValues.MONITORINFO);
+                    monitorInfo.cbSize = (uint)Marshal.SizeOf(typeof(InteropValues.MONITORINFO));
+                    InteropMethods.GetMonitorInfo(monitor, ref monitorInfo);
+                    var rcWorkArea = monitorInfo.rcWork;
+                    var rcMonitorArea = monitorInfo.rcMonitor;
+                    mmi.ptMaxPosition.X = Math.Abs(rcWorkArea.Left - rcMonitorArea.Left);
+                    mmi.ptMaxPosition.Y = Math.Abs(rcWorkArea.Top - rcMonitorArea.Top);
+                    mmi.ptMaxSize.X = Math.Abs(rcWorkArea.Right - rcWorkArea.Left);
+                    mmi.ptMaxSize.Y = Math.Abs(rcWorkArea.Bottom - rcWorkArea.Top - 1);
+                }
+            }
+
+            Marshal.StructureToPtr(mmi, lParam, true);
+        }
+
+        protected override void OnSourceInitialized(EventArgs e)
+        {
+            this.GetHwndSource()?.AddHook(HwndSourceHook);
+            base.OnSourceInitialized(e);
+        }
+
+        private IntPtr HwndSourceHook(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled)
+        {
+            switch (msg)
+            {
+                case InteropValues.WM_WINDOWPOSCHANGED:
+                    Padding = WindowState == WindowState.Maximized ? WindowHelper.WindowMaximizedPadding : _commonPadding;
+                    break;
+                case InteropValues.WM_GETMINMAXINFO:
+                    WmGetMinMaxInfo(hwnd, lparam);
+                    Padding = WindowState == WindowState.Maximized ? WindowHelper.WindowMaximizedPadding : _commonPadding;
+                    handled = true;
+                    break;
+            }
+
+            return IntPtr.Zero;
+        }
+
+
         public Brush CloseButtonBackground
         {
             get => (Brush)GetValue(CloseButtonBackgroundProperty);

src/Shared/HandyControl_Shared/Themes/Styles/Window.xaml

@@ -128,7 +128,6 @@
                             <Setter Property="Opacity" Value=".8" TargetName="ButtonPanel"/>
                         </Trigger>
                         <Trigger Property="WindowState" Value="Maximized">
-                            <Setter Property="Padding" Value="{x:Static tools:WindowHelper.WindowMaximizedPadding}"/>
                             <Setter Property="Visibility" Value="Collapsed" TargetName="ButtonMax"/>
                             <Setter Property="Visibility" Value="Visible" TargetName="ButtonRestore"/>
                         </Trigger>

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;
+        }
     }
 }