squash a bunch of commits

Shogi.UI/Shared/Modal/ModalService.cs

@@ -0,0 +1,54 @@
+namespace Shogi.UI.Shared.Modal
+{
+	/// <summary>
+	/// An injectible service which can be invoked to display preset modals via the <Modals /> razor component.
+	/// Only one modal me be visible at a time.
+	/// </summary>
+	public class ModalService
+	{
+		public event EventHandler<ModalVisibilityChangedEventArgs>? ModalVisibilityChangedEvent;
+
+		public ModalService()
+		{
+		}
+
+		public bool LoginModalIsVisible { get; private set; }
+		public bool GuestAccountDescriptionIsVisible { get; private set; }
+
+		public void ShowLoginModal()
+		{
+			SetAllVisibilitiesToFalse();
+			LoginModalIsVisible = true;
+			EmitCurrentState();
+		}
+
+		public void ShowGuestAccountDescriptionModal()
+		{
+			SetAllVisibilitiesToFalse();
+			GuestAccountDescriptionIsVisible = true;
+			EmitCurrentState();
+		}
+
+		public void HideAllModals()
+		{
+			SetAllVisibilitiesToFalse();
+			EmitCurrentState();
+		}
+
+		private void EmitCurrentState()
+		{
+			ModalVisibilityChangedEvent?.Invoke(this, new()
+			{
+				LoginModalIsVisible = LoginModalIsVisible,
+				GuestAccountDescriptionIsVisible = GuestAccountDescriptionIsVisible
+			});
+		}
+
+		private void SetAllVisibilitiesToFalse()
+		{
+			LoginModalIsVisible = false;
+			GuestAccountDescriptionIsVisible = false;
+		}
+
+	}
+}