76 bug maximize window to cover taskbar height when window width is limited

src/MicaWPF.Core/Controls/MicaWindow/MicaWindowInteropHandler.cs

@@ -2,6 +2,7 @@
 // This software is distributed under the MIT license and its code is open-source and free for use, modification, and distribution.
 // </copyright>
 
+using System.Runtime.InteropServices;
 using System.Windows;
 using System.Windows.Automation.Peers;
 using System.Windows.Automation.Provider;
@@ -42,6 +43,22 @@ protected override void OnInitialized(EventArgs e)
         base.OnInitialized(e);
     }
 
+    protected Size GetHostingScreenSize()
+    {
+        var windowHwnd = new WindowInteropHelper(this).EnsureHandle();
+
+        var mi = default(InteropValues.MONITORINFO);
+        mi.cbSize = (uint)Marshal.SizeOf(mi);
+
+        var monitor = InteropMethods.MonitorFromWindow(windowHwnd, 2);
+        InteropMethods.GetMonitorInfo(monitor, ref mi);
+
+        var width = mi.rcWork.right - mi.rcWork.left;
+        var height = mi.rcWork.bottom - mi.rcWork.top;
+
+        return new Size(width, height);
+    }
+
     private nint ShowSnapLayout(nint lparam, ref bool handled)
     {
         var x = (short)(lparam.ToInt32() & 0xffff);
@@ -119,6 +136,24 @@ private nint HwndSourceHook(nint hwnd, int msg, nint n, nint lparam, ref bool ha
                 break;
             case InteropValues.HwndSourceMessages.WM_NCLBUTTONDOWN:
                 HideMaximiseAndMinimiseButton(lparam, ref handled);
+                break;
+            case InteropValues.HwndSourceMessages.WM_GETMINMAXINFO:
+                var mmiNullable = (InteropValues.MINMAXINFO?)Marshal.PtrToStructure(lparam, typeof(InteropValues.MINMAXINFO));
+                if (mmiNullable.HasValue)
+                {
+                    var mmi = mmiNullable.Value;
+                    var screen = GetHostingScreenSize();
+                    if (MaxWidth < screen.Width)
+                    {
+                        mmi.ptMaxPosition.X = (int)((screen.Width - MaxWidth) / 2);
+                        mmi.ptMaxSize.X = (int)MaxWidth;
+                        mmi.ptMaxSize.Y = (int)screen.Height + 8;
+
+                        Marshal.StructureToPtr(mmi, lparam, true);
+                        handled = true;
+                    }
+                }
+
                 break;
             case InteropValues.HwndSourceMessages.WM_WINDOWPOSCHANGING:
                 var button = WindowState == WindowState.Maximized ? ButtonRestore : ButtonMax;

src/MicaWPF.Core/Interop/InteropMethods.cs

@@ -133,7 +133,7 @@ public static DWMCOLORIZATIONPARAMS GetDwmGetColorizationParameters()
     /// <param name="handle">A handle to the window of interest.</param>
     /// <param name="flags">Determines the function's return value if the window does not intersect any display monitor.</param>
     /// <returns>If the window intersects one or more display monitor rectangles, the return value is an HMONITOR handle to the display monitor that has the largest area of intersection with the window.</returns>
-    [LibraryImport(ExternDll.User32)]
+    [LibraryImport(ExternDll.User32, SetLastError = true)]
     [DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
     internal static partial nint MonitorFromWindow(nint handle, uint flags);
 
@@ -143,7 +143,7 @@ public static DWMCOLORIZATIONPARAMS GetDwmGetColorizationParameters()
     /// <param name="hMonitor">A handle to the display monitor of interest.</param>
     /// <param name="lpmi">A pointer to a MONITORINFO or MONITORINFOEX structure that receives information about the specified display monitor.</param>
     /// <returns>If the function succeeds, the return value is true. If the function fails, the return value is false.</returns>
-    [LibraryImport(ExternDll.User32)]
+    [LibraryImport(ExternDll.User32, EntryPoint = "GetMonitorInfoW")]
     [DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
     [return: MarshalAs(UnmanagedType.Bool)]
     internal static partial bool GetMonitorInfo(nint hMonitor, ref MONITORINFO lpmi);

src/MicaWPF.Core/Interop/InteropValues.cs

@@ -36,6 +36,206 @@ public enum DWM_WINDOW_CORNER_PREFERENCE
         DWMWCP_ROUNDSMALL = 3,
     }
 
+    public enum DeviceCap
+    {
+        /// <summary>
+        /// Device driver version.
+        /// </summary>
+        DRIVERVERSION = 0,
+
+        /// <summary>
+        /// Device classification.
+        /// </summary>
+        TECHNOLOGY = 2,
+
+        /// <summary>
+        /// Horizontal size in millimeters.
+        /// </summary>
+        HORZSIZE = 4,
+
+        /// <summary>
+        /// Vertical size in millimeters.
+        /// </summary>
+        VERTSIZE = 6,
+
+        /// <summary>
+        /// Horizontal width in pixels.
+        /// </summary>
+        HORZRES = 8,
+
+        /// <summary>
+        /// Vertical height in pixels.
+        /// </summary>
+        VERTRES = 10,
+
+        /// <summary>
+        /// Number of bits per pixel.
+        /// </summary>
+        BITSPIXEL = 12,
+
+        /// <summary>
+        /// Number of planes.
+        /// </summary>
+        PLANES = 14,
+
+        /// <summary>
+        /// Number of brushes the device has.
+        /// </summary>
+        NUMBRUSHES = 16,
+
+        /// <summary>
+        /// Number of pens the device has.
+        /// </summary>
+        NUMPENS = 18,
+
+        /// <summary>
+        /// Number of markers the device has.
+        /// </summary>
+        NUMMARKERS = 20,
+
+        /// <summary>
+        /// Number of fonts the device has.
+        /// </summary>
+        NUMFONTS = 22,
+
+        /// <summary>
+        /// Number of colors the device supports.
+        /// </summary>
+        NUMCOLORS = 24,
+
+        /// <summary>
+        /// Size required for device descriptor.
+        /// </summary>
+        PDEVICESIZE = 26,
+
+        /// <summary>
+        /// Curve capabilities.
+        /// </summary>
+        CURVECAPS = 28,
+
+        /// <summary>
+        /// Line capabilities.
+        /// </summary>
+        LINECAPS = 30,
+
+        /// <summary>
+        /// Polygonal capabilities.
+        /// </summary>
+        POLYGONALCAPS = 32,
+
+        /// <summary>
+        /// Text capabilities.
+        /// </summary>
+        TEXTCAPS = 34,
+
+        /// <summary>
+        /// Clipping capabilities.
+        /// </summary>
+        CLIPCAPS = 36,
+
+        /// <summary>
+        /// Bitblt capabilities.
+        /// </summary>
+        RASTERCAPS = 38,
+
+        /// <summary>
+        /// Length of the X leg.
+        /// </summary>
+        ASPECTX = 40,
+
+        /// <summary>
+        /// Length of the Y leg.
+        /// </summary>
+        ASPECTY = 42,
+
+        /// <summary>
+        /// Length of the hypotenuse.
+        /// </summary>
+        ASPECTXY = 44,
+
+        /// <summary>
+        /// Shading and Blending caps.
+        /// </summary>
+        SHADEBLENDCAPS = 45,
+
+        /// <summary>
+        /// Logical pixels inch in X.
+        /// </summary>
+        LOGPIXELSX = 88,
+
+        /// <summary>
+        /// Logical pixels inch in Y.
+        /// </summary>
+        LOGPIXELSY = 90,
+
+        /// <summary>
+        /// Number of entries in physical palette.
+        /// </summary>
+        SIZEPALETTE = 104,
+
+        /// <summary>
+        /// Number of reserved entries in palette.
+        /// </summary>
+        NUMRESERVED = 106,
+
+        /// <summary>
+        /// Actual color resolution.
+        /// </summary>
+        COLORRES = 108,
+
+        // Printing related DeviceCaps. These replace the appropriate Escapes
+
+        /// <summary>
+        /// Physical Width in device units.
+        /// </summary>
+        PHYSICALWIDTH = 110,
+
+        /// <summary>
+        /// Physical Height in device units.
+        /// </summary>
+        PHYSICALHEIGHT = 111,
+
+        /// <summary>
+        /// Physical Printable Area x margin.
+        /// </summary>
+        PHYSICALOFFSETX = 112,
+
+        /// <summary>
+        /// Physical Printable Area y margin.
+        /// </summary>
+        PHYSICALOFFSETY = 113,
+
+        /// <summary>
+        /// Scaling factor x.
+        /// </summary>
+        SCALINGFACTORX = 114,
+
+        /// <summary>
+        /// Scaling factor y.
+        /// </summary>
+        SCALINGFACTORY = 115,
+
+        /// <summary>
+        /// Current vertical refresh rate of the display device (for displays only) in Hz.
+        /// </summary>
+        VREFRESH = 116,
+
+        /// <summary>
+        /// Vertical height of entire desktop in pixels.
+        /// </summary>
+        DESKTOPVERTRES = 117,
+
+        /// <summary>
+        /// Horizontal width of entire desktop in pixels.
+        /// </summary>
+        DESKTOPHORZRES = 118,
+
+        /// <summary>
+        /// Preferred blt alignment.
+        /// </summary>
+        BLTALIGNMENT = 119,
+    }
+
     [StructLayout(LayoutKind.Sequential)]
     public struct MARGINS
     {
@@ -56,28 +256,19 @@ public struct DWMCOLORIZATIONPARAMS
         public bool fOpaque;
     }
 
-    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct RECT
     {
-        public int Left;
-        public int Top;
-        public int Right;
-        public int Bottom;
-
-        public RECT(int left, int top, int right, int bottom)
-        {
-            Left = left;
-            Top = top;
-            Right = right;
-            Bottom = bottom;
-        }
+        public int left;
+        public int top;
+        public int right;
+        public int bottom;
     }
 
     [StructLayout(LayoutKind.Sequential)]
     public struct MONITORINFO
     {
-        public int cbSize;
+        public uint cbSize;
         public RECT rcMonitor;
         public RECT rcWork;
         public uint dwFlags;