[Accessibility]: Adding MonthCalendar control UI Automation providers to improve calendar control accessibility

src/Common/src/Interop/ComCtl32/Interop.MCGIF.cs

@@ -0,0 +1,34 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+internal static partial class Interop
+{
+    internal static partial class ComCtl32
+    {
+        /// <summary>
+        /// Represents MonthCalendar Control Grid Info Flags.
+        /// Copied form CommCtrl.h
+        /// </summary>
+        [Flags]
+        public enum MCGIF
+        {
+            /// <summary>
+            /// Represetns MCGIF_DATE const.
+            /// </summary>
+            DATE = 0x00000001,
+
+            /// <summary>
+            /// Represents MCGIF_RECT cosnt.
+            /// </summary>
+            RECT = 0x00000002,
+
+            /// <summary>
+            /// Represetns MCGIF_NAME const.
+            /// </summary>
+            NAME = 0x00000004
+        }
+    }
+}

src/Common/src/Interop/ComCtl32/Interop.MCGIP.cs

@@ -0,0 +1,61 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+internal static partial class Interop
+{
+    internal static partial class ComCtl32
+    {
+        /// <summary>
+        /// Represents MonthCalendar control part constants.
+        /// Copied form CommCtrl.h
+        /// </summary>
+        public enum MCGIP : uint
+        {
+            /// <summary>
+            /// Represents MCGIP_CALENDARCONTROL const.
+            /// </summary>
+            CALENDARCONTROL = 0,
+
+            /// <summary>
+            /// Represents MCGIP_NEXT const.
+            /// </summary>
+            NEXT = 1,
+
+            /// <summary>
+            /// Represents MCGIP_PREV const.
+            /// </summary>
+            PREV = 2,
+
+            /// <summary>
+            /// Represents MCGIP_FOOTER const.
+            /// </summary>
+            FOOTER = 3,
+
+            /// <summary>
+            /// Represents MCGIP_CALENDAR const.
+            /// </summary>
+            CALENDAR = 4,
+
+            /// <summary>
+            /// Represents MCGIP_CALENDARHEADER const.
+            /// </summary>
+            CALENDARHEADER = 5,
+
+            /// <summary>
+            /// Represents MCGIP_CALENDARBODY const.
+            /// </summary>
+            CALENDARBODY = 6,
+
+            /// <summary>
+            /// Represents MCGIP_CALENDARROW const.
+            /// </summary>
+            CALENDARROW = 7,
+
+            /// <summary>
+            /// Represents MCGIP_CALENDARCELL const.
+            /// </summary>
+            CALENDARCELL = 8
+        }
+    }
+}

src/Common/src/Interop/ComCtl32/Interop.MCGRIDINFO.cs

@@ -0,0 +1,37 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.InteropServices;
+using static System.Windows.Forms.NativeMethods;
+
+internal static partial class Interop
+{
+    internal static partial class ComCtl32
+    {
+        /// <summary>
+        /// MonthCalendar grid info structure.
+        /// Copied form CommCtrl.h
+        /// </summary>
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+        public unsafe struct MCGRIDINFO
+        {
+            public uint cbSize;
+            public MCGIP dwPart;
+            public MCGIF dwFlags;
+            public int iCalendar;
+            public int iRow;
+            public int iCol;
+            public bool bSelected;
+            public Kernel32.SYSTEMTIME stStart;
+            public Kernel32.SYSTEMTIME stEnd;
+            public RECT rc;
+            public string pszName;
+            public uint cchName;
+        }
+
+        [DllImport(ExternDll.User32, CharSet = CharSet.Auto)]
+        public extern static IntPtr SendMessage(HandleRef hWnd, int Msg, int wParam, [In, Out] ref MCGRIDINFO gridInfo);
+    }
+}

src/Common/src/Interop/ComCtl32/Interop.MCHITTESTINFO.cs

@@ -0,0 +1,27 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class ComCtl32
+    {
+        /// <summary>
+        /// <see cref="https://docs.microsoft.com/en-us/windows/win32/api/commctrl/ns-commctrl-mchittestinfo"/>
+        /// </summary>
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+        public struct MCHITTESTINFO
+        {
+            public int cbSize;
+            public POINT pt;
+            public int uHit;
+            public Kernel32.SYSTEMTIME st;
+            public RECT rc;
+            public int iOffset;
+            public int iRow;
+            public int iCol;
+        }
+    }
+}

src/Common/src/Interop/ComCtl32/Interop.MCHT.cs

@@ -0,0 +1,116 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+internal static partial class Interop
+{
+    internal static partial class ComCtl32
+    {
+        /// <summary>
+        /// Represents MonthCalendar Control HitTest values.
+        /// Copied form CommCtrl.h
+        /// </summary>
+        public enum MCHT
+        {
+            /// <summary>
+            /// MCHT_TITLE
+            /// </summary>
+            TITLE = 0x00010000,
+
+            /// <summary>
+            /// Represents MCHT_CALENDAR const.
+            /// </summary>
+            CALENDAR = 0x00020000,
+
+            /// <summary>
+            /// Represents MCHT_TODAYLINK const.
+            /// </summary>
+            TODAYLINK = 0x00030000,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARCONTROL const.
+            /// </summary>
+            CALENDARCONTROL = 0x00100000,
+
+            /// <summary>
+            /// Represents MCHT_NEXT const.
+            /// </summary>
+            NEXT = 0x01000000,
+
+            /// <summary>
+            /// Represents MCHT_PREV const.
+            /// </summary>
+            PREV = 0x02000000,
+
+            /// <summary>
+            /// Represents MCHT_NOWHERE const.
+            /// </summary>
+            NOWHERE = 0x00000000,
+
+            /// <summary>
+            /// Represents MCHT_TITLEBK const.
+            /// </summary>
+            TITLEBK = TITLE,
+
+            /// <summary>
+            /// Represents MCHT_TITLEMONTH const.
+            /// </summary>
+            TITLEMONTH = TITLE | 0x0001,
+
+            /// <summary>
+            /// Represents MCHT_TITLEYEAR const.
+            /// </summary>
+            TITLEYEAR = TITLE | 0x0002,
+
+            /// <summary>
+            /// Represents MCHT_TITLEBTNNEXT const.
+            /// </summary>
+            TITLEBTNNEXT = TITLE | NEXT | 0x0003,
+
+            /// <summary>
+            /// Represents MCHT_TITLEBTNPREV const.
+            /// </summary>
+            TITLEBTNPREV = TITLE | PREV | 0x0003,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARBK const.
+            /// </summary>
+            CALENDARBK = CALENDAR,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARDATE const.
+            /// </summary>
+            CALENDARDATE = CALENDAR | 0x0001,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARDATENEXT const.
+            /// </summary>
+            CALENDARDATENEXT = CALENDARDATE | NEXT,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARDATEPREV const.
+            /// </summary>
+            CALENDARDATEPREV = CALENDARDATE | PREV,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARDAY const.
+            /// </summary>
+            CALENDARDAY = CALENDAR | 0x0002,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARWEEKNUM const.
+            /// </summary>
+            CALENDARWEEKNUM = CALENDAR | 0x0003,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARDATEMIN const.
+            /// </summary>
+            CALENDARDATEMIN = CALENDAR | 0x0004,
+
+            /// <summary>
+            /// Represents MCHT_CALENDARDATEMAX const.
+            /// </summary>
+            CALENDARDATEMAX = CALENDAR | 0x0005
+        }
+    }
+}

src/Common/src/Interop/ComCtl32/Interop.MCM.cs

@@ -0,0 +1,101 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+internal static partial class Interop
+{
+    internal static partial class ComCtl32
+    {
+        /// <summary>
+        /// Represents MonthCalendar Control Messages.
+        /// Copied form CommCtrl.h
+        /// </summary>
+        public enum MCM
+        {
+            /// <summary>
+            /// Represents MCM_FIRST const.
+            /// </summary>
+            FIRST = 0x1000,
+
+            /// <summary>
+            /// Represents MCM_GETCURSEL const.
+            /// </summary>
+            GETCURSEL = FIRST + 1,
+
+            /// <summary>
+            /// Represents MCM_SETMAXSELCOUNT const.
+            /// </summary>
+            SETMAXSELCOUNT = FIRST + 4,
+
+            /// <summary>
+            /// Represents MCM_GETSELRANGE const.
+            /// </summary>
+            GETSELRANGE = FIRST + 5,
+
+            /// <summary>
+            /// Represents MCM_SETSELRANGE const.
+            /// </summary>
+            SETSELRANGE = FIRST + 6,
+
+            /// <summary>
+            /// Represents MCM_GETMONTHRANGE const.
+            /// </summary>
+            GETMONTHRANGE = FIRST + 7,
+
+            /// <summary>
+            /// Represents MCM_GETMINREQRECT const.
+            /// </summary>
+            GETMINREQRECT = FIRST + 9,
+
+            /// <summary>
+            /// Represents MCM_SETCOLOR const.
+            /// </summary>
+            SETCOLOR = FIRST + 10,
+
+            /// <summary>
+            /// Represents MCM_SETTODAY const.
+            /// </summary>
+            SETTODAY = FIRST + 12,
+
+            /// <summary>
+            /// Represents MCM_GETTODAY const.
+            /// </summary>
+            GETTODAY = FIRST + 13,
+
+            /// <summary>
+            /// Represents MCM_HITTEST const.
+            /// </summary>
+            HITTEST = FIRST + 14,
+
+            /// <summary>
+            /// Represents MCM_SETFIRSTDAYOFWEEK const.
+            /// </summary>
+            SETFIRSTDAYOFWEEK = FIRST + 15,
+
+            /// <summary>
+            /// Represents MCM_GETRANGE const.
+            /// </summary>
+            GETRANGE = FIRST + 17,
+
+            /// <summary>
+            /// Represents MCM_SETRANGE const.
+            /// </summary>
+            SETRANGE = FIRST + 18,
+
+            /// <summary>
+            /// Represents MCM_SETMONTHDELTA const.
+            /// </summary>
+            SETMONTHDELTA = FIRST + 20,
+
+            /// <summary>
+            /// Represents MCM_GETMAXTODAYWIDTH const.
+            /// </summary>
+            GETMAXTODAYWIDTH = FIRST + 21,
+
+            /// <summary>
+            /// Represents MCM_GETCALENDARGRIDINFO const.
+            /// </summary>
+            GETCALENDARGRIDINFO = FIRST + 24
+        }
+    }
+}