From b01ac18771a8eb8a23e6845afffc70abdd6d72ee Mon Sep 17 00:00:00 2001
From: Jared Goodwin <translucency@outlook.com>
Date: Wed, 22 Apr 2020 08:58:05 -0700
Subject: [PATCH] Add Windows native message box.

---
 Shared/Win32/User32.cs       | 47 ++++++++++++++++++++++++++++++++++++
 Shared/Win32/Win32Interop.cs |  7 ++++++
 2 files changed, 54 insertions(+)

diff --git a/Shared/Win32/User32.cs b/Shared/Win32/User32.cs
index df23acd9a..90e3ab32d 100644
--- a/Shared/Win32/User32.cs
+++ b/Shared/Win32/User32.cs
@@ -1000,6 +1000,51 @@ public enum InputType : uint
             KEYBOARD = 1,
             HARDWARE = 2
         }
+        public enum MessageBoxType : long
+        {
+            MB_ABORTRETRYIGNORE = 0x00000002L,
+            MB_CANCELTRYCONTINUE = 0x00000006L,
+            MB_HELP = 0x00004000L,
+            MB_OK = 0x00000000L,
+            MB_OKCANCEL = 0x00000001L,
+            MB_RETRYCANCEL = 0x00000005L,
+            MB_YESNO = 0x00000004L,
+            MB_YESNOCANCEL = 0x00000003L,
+            MB_ICONEXCLAMATION = 0x00000030L,
+            MB_ICONWARNING = 0x00000030L,
+            MB_ICONINFORMATION = 0x00000040L,
+            MB_ICONASTERISK = 0x00000040L,
+            MB_ICONQUESTION = 0x00000020L,
+            MB_ICONSTOP = 0x00000010L,
+            MB_ICONERROR = 0x00000010L,
+            MB_ICONHAND = 0x00000010L,
+            MB_DEFBUTTON1 = 0x00000000L,
+            MB_DEFBUTTON2 = 0x00000100L,
+            MB_DEFBUTTON3 = 0x00000200L,
+            MB_DEFBUTTON4 = 0x00000300L,
+            MB_APPLMODAL = 0x00000000L,
+            MB_SYSTEMMODAL = 0x00001000L,
+            MB_TASKMODAL = 0x00002000L,
+            MB_DEFAULT_DESKTOP_ONLY = 0x00020000L,
+            MB_RIGHT = 0x00080000L,
+            MB_RTLREADING = 0x00100000L,
+            MB_SETFOREGROUND = 0x00010000L,
+            MB_TOPMOST = 0x00040000L,
+            MB_SERVICE_NOTIFICATION = 0x00200000L
+        }
+
+        public enum MessageBoxResult : int
+        {
+            IDABORT = 3,
+            IDCANCEL = 2,
+            IDCONTINUE = 11,
+            IDIGNORE = 5,
+            IDNO = 7,
+            IDOK = 1,
+            IDRETRY = 4,
+            IDTRYAGAIN = 10,
+            IDYES = 6,
+        }
         #endregion
 
         #region Structs
@@ -1249,6 +1294,8 @@ public static extern int SystemParametersInfo(
         [return: MarshalAs(UnmanagedType.Bool)]
         public static extern bool BlockInput([MarshalAs(UnmanagedType.Bool)] bool fBlockIt);
 
+        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
+        public static extern int MessageBox(IntPtr hWnd, string text, string caption, long type);
 
         #endregion
     }
diff --git a/Shared/Win32/Win32Interop.cs b/Shared/Win32/Win32Interop.cs
index 66fc87383..2c8984a07 100644
--- a/Shared/Win32/Win32Interop.cs
+++ b/Shared/Win32/Win32Interop.cs
@@ -177,6 +177,13 @@ public static void SetMonitorState(MonitorState state)
             SendMessage(0xFFFF, 0x112, 0xF170, (int)state);
         }
 
+        public static MessageBoxResult ShowMessageBox(IntPtr owner, 
+            string message, 
+            string caption,
+            MessageBoxType messageBoxType)
+        {
+            return (MessageBoxResult)MessageBox(owner, message, caption, (long)messageBoxType);
+        }
         public static bool SwitchToInputDesktop()
         {
             var inputDesktop = OpenInputDesktop();