From 40a9e8e70ff908ffd59b643d0d399d74d0eda8b8 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Sun, 12 Jul 2020 21:39:46 +0000
Subject: Added code to check if app should quit.

---
 SpriteEd/AppDelegate.cs | 67 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/SpriteEd/AppDelegate.cs b/SpriteEd/AppDelegate.cs
index 1969e7e..073bfc9 100644
--- a/SpriteEd/AppDelegate.cs
+++ b/SpriteEd/AppDelegate.cs
@@ -49,6 +49,73 @@ namespace SpriteEd
         {
         }
 
+        public override NSApplicationTerminateReply ApplicationShouldTerminate(NSApplication sender)
+        {
+            NSApplicationTerminateReply reply = NSApplicationTerminateReply.Cancel;
+            bool changed = false;
+
+            foreach (NSWindow window in NSApplication.SharedApplication.DangerousWindows)
+            {
+                changed = changed || window.DocumentEdited;
+            }
+
+            if (changed)
+            {
+                NSAlert alert = new NSAlert ()
+                {
+                    AlertStyle = NSAlertStyle.Critical,
+                    InformativeText = "Save changes to document(s) before closing window?",
+                    MessageText = "Save Document",
+                };
+
+                alert.AddButton ("Save");
+                alert.AddButton ("Delete");
+                alert.AddButton ("Cancel");
+
+                switch (alert.RunModal())
+                {
+                    case 1000:
+                        bool saved = true;
+
+                        foreach (NSWindow window in NSApplication.SharedApplication.DangerousWindows)
+                        {
+                            if (window.DocumentEdited)
+                            {
+                                ViewController view = window.ContentViewController as ViewController;
+
+                                if (view.Untitled)
+                                {
+                                    saved = saved && view.SaveAs();
+                                }
+                                else
+                                {
+                                    saved = saved && view.Save();
+                                }
+                            }
+                        }
+
+                        if (saved)
+                        {
+                            reply = NSApplicationTerminateReply.Now;
+                        }
+                        break;
+
+                    case 1001:
+                        reply = NSApplicationTerminateReply.Now;
+                        break;
+
+                    default:
+                        break;
+                }
+            }
+            else
+            {
+                reply = NSApplicationTerminateReply.Now;
+            }
+
+            return reply;
+        }
+
         /// <summary>
         /// Get the current view controller.
         /// </summary>
-- 
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