Merge pull request #71 from irihitech/dialog

Dialog System, and MessageBox remake

src/Ursa/Common/DialogButton.cs

@@ -0,0 +1,11 @@
+namespace Ursa.Common;
+
+public enum DialogButton
+{
+    None,
+    OK,
+    OKCancel,
+    YesNo,
+    YesNoCancel,
+}
+

src/Ursa/Common/DialogResult.cs

@@ -0,0 +1,10 @@
+namespace Ursa.Common;
+
+public enum DialogResult
+{
+    Cancel,
+    No,
+    None,
+    OK,
+    Yes,
+}

src/Ursa/Common/EventHelper.cs

@@ -0,0 +1,23 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace Ursa.Common;
+
+internal static class EventHelper
+{
+    public static void RegisterClickEvent(EventHandler<RoutedEventArgs> handler, params Button?[] buttons)
+    {
+        foreach (var button in buttons)
+        {
+            if(button is not null) button.Click += handler;
+        }
+    }
+    
+    public static void UnregisterClickEvent(EventHandler<RoutedEventArgs> handler, params Button?[] buttons)
+    {
+        foreach (var button in buttons)
+        {
+            if(button is not null) button.Click -= handler;
+        }
+    }
+}