Implement custom MessageBox with customizable options

Fushigi/ui/widgets/CourseScene.cs

@@ -81,7 +81,7 @@ public void DrawUI(GL gl)
             {
                 CourseErrorList();
             }
-
+            
             ulong selectionVersionBefore = activeViewport.mEditContext.SelectionVersion;
 
             bool status = ImGui.Begin("Viewports");

Fushigi/util/MessageBox.cs

@@ -0,0 +1,79 @@
+using ImGuiNET;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fushigi.util
+{
+    public class MessageBox
+    {
+        public enum MessageBoxType
+        {
+            YesNo = 0,
+            Ok = 1
+        }
+
+        public enum MessageBoxResult
+        {
+            Waiting = -1,
+            Ok = 0,
+            No = 1,
+            Yes = 2,
+            Closed = 3
+        }
+
+        public MessageBox(MessageBoxType type)
+        {
+            mType = type;
+        }
+
+        public MessageBoxResult Show(string header, string message)
+        {
+            MessageBoxResult res = MessageBoxResult.Waiting;
+
+            bool needsClose = true;
+            bool status = ImGui.Begin(header, ref needsClose);
+            ImGui.Text(message);
+
+            switch (mType)
+            {
+                case MessageBoxType.Ok:
+                    if (ImGui.Button("OK"))
+                    {
+                        res = MessageBoxResult.Ok;
+                    }
+                    break;
+                case MessageBoxType.YesNo:
+                    if (ImGui.Button("Yes"))
+                    {
+                        res = MessageBoxResult.Yes;
+                    }
+
+                    ImGui.SameLine();
+
+                    if (ImGui.Button("No"))
+                    {
+                        res = MessageBoxResult.No;
+                    }
+                    break;
+            }
+
+            if (!needsClose)
+            {
+                res = MessageBoxResult.Closed;
+            }
+
+            if (status)
+            {
+                ImGui.End();
+            }
+
+            return res;
+        }
+
+        MessageBoxType mType;
+    }
+}