Better move error visibility

Shogi.Api/Application/ShogiApplication.cs

@@ -87,28 +87,21 @@ public class ShogiApplication(
 			return new ForbidResult();
 		}
 
-		try
+		var moveResult = command.PieceFromHand.HasValue
+			? session.Board.Move(command.PieceFromHand.Value.ToDomain(), command.To)
+			: session.Board.Move(command.From!, command.To, command.IsPromotion ?? false);
+
+		if (moveResult.IsSuccess)
 		{
-			if (command.PieceFromHand.HasValue)
+			await sessionRepository.CreateMove(sessionId, command);
-			{
+			await gameHubContext.Emit_PieceMoved(sessionId);
-				session.Board.Move(command.PieceFromHand.Value.ToDomain(), command.To);
+			return new NoContentResult();
 		}
 		else
 		{
-				var isPromotion = command.IsPromotion ?? false;
+			return new ConflictObjectResult(moveResult.Reason);
-				session.Board.Move(command.From!, command.To, isPromotion);
-			}
-		}
-		catch (InvalidOperationException e)
-		{
-			return new ConflictObjectResult(e.Message);
 		}
 
-		await sessionRepository.CreateMove(sessionId, command);
-
-		await gameHubContext.Emit_PieceMoved(sessionId);
-
-		return new NoContentResult();
 	}
 
 	public async Task<IActionResult> JoinSession(string sessionId, string player2Id)

Shogi.UI/Pages/Home/HomePage.razor

@@ -31,13 +31,11 @@
 	<h3>Capturing and the Hand</h3>
 	<h3>The King and "Check"</h3>
 	<h3>Victory</h3>
-
 </main>
 
 @code {
-
+	private bool show = true;
 	private string activeSessionName = string.Empty;
-
 	private Task OnLoginChanged()
 	{
 		StateHasChanged();
@@ -48,4 +46,10 @@
 		activeSessionName = s.SessionId.ToString();
 		StateHasChanged();
 	}
+
+	private void OnClickClose()
+	{
+		show = false;
+		StateHasChanged();
+	}
 }

Shogi.UI/Pages/Play/GameBoard/SeatedGameBoard.razor

@@ -14,8 +14,6 @@
 
 	@if (showPromotePrompt)
 	{
-		<!-- Promote prompt -->
-		<!-- TODO: Add a background div which prevents mouse inputs to the board while this decision is being made. -->
 		<section class="promote-prompt">
 			<p>Do you wish to promote?</p>
 			<div>
@@ -25,10 +23,17 @@
 			</div>
 		</section>
 	}
+	@if (showError)
+	{
+		<div class="errorModal">
+			<TemporaryModal OnClickClose="HideError">
+				<p>That is not a valid move.</p>
+			</TemporaryModal>
+		</div>
+	}
+	</Stretch>
 
-</Stretch>
+	@code {
-
-@code {
 	[Parameter, EditorRequired]
 	public WhichPlayer Perspective { get; set; }
 	[Parameter, EditorRequired]
@@ -37,6 +42,7 @@
 	private WhichPiece? selectedPieceFromHand;
 	private bool showPromotePrompt;
 	private string? moveTo;
+	private bool showError = false;
 
 	protected override void OnParametersSet()
 	{
@@ -96,6 +102,7 @@
 				if (!success)
 				{
 					selectedPieceFromHand = null;
+					showError = true;
 				}
 			}
 			StateHasChanged();
@@ -119,9 +126,12 @@
 				else
 				{
 					var success = await ShogiApi.Move(Session.SessionId, new MovePieceCommand(selectedBoardPosition, position, false));
+					Console.WriteLine("Success? {0}", success);
 					if (!success)
 					{
 						selectedBoardPosition = null;
+						showError = true;
+						Console.WriteLine("Show error");
 					}
 				}
 				StateHasChanged();
@@ -149,11 +159,16 @@
 	{
 		if (selectedBoardPosition != null && moveTo != null)
 		{
-			await ShogiApi.Move(Session.SessionId, new MovePieceCommand(selectedBoardPosition, moveTo, shouldPromote));
+			showError = await ShogiApi.Move(Session.SessionId, new MovePieceCommand(selectedBoardPosition, moveTo, shouldPromote));
 			showPromotePrompt = false;
 			return;
 		}
 
 		throw new InvalidOperationException("Unexpected scenario during OnClickPromotionChoice.");
 	}
+
+	void HideError()
+	{
+		showError = false;
+	}
 }

Shogi.UI/Pages/Play/GameBoard/SeatedGameBoard.razor.css

@@ -8,7 +8,12 @@
 	box-shadow: 1px 1px 1px #444;
 	text-align: center;
 	z-index: 101;
-
 	background-color: #444;
 	border: 1px solid black;
 }
+
+.errorModal {
+	position: absolute;
+	top: 1rem;
+	right: 1rem;
+}

Shogi.UI/Pages/SearchPage.razor.css

@@ -1,4 +1,3 @@
 .SearchPage {
-	background-color: var(--contrast-color);
 	padding: 0 0.5rem;
 }

Shogi.UI/Shared/TemporaryModal.razor

@@ -0,0 +1,39 @@
+@using System.Timers
+<div class="TemporaryModal PrimaryTheme ThemeVariant--Contrast">
+	<div class="content">
+		@ChildContent
+	</div>
+	<button class="close" @onclick="OnClickClose">X</button>
+	<div class="countdown" style="--timeToClose: @TimeToClose">
+		<div class="time-background">
+			<div class="time"></div>
+		</div>
+		<div class="time-helper-text">This message will close soon.</div>
+	</div>
+</div>
+
+@code {
+	[Parameter][EditorRequired] public RenderFragment? ChildContent { get; set; }
+	[Parameter][EditorRequired] public EventCallback OnClickClose { get; set; }
+
+	[Parameter] public int SecondsUntilClose { get; set; } = 3;
+
+	private string TimeToClose => $"{SecondsUntilClose}s";
+	private System.Timers.Timer closingTimer = new System.Timers.Timer();
+
+	protected override void OnParametersSet()
+	{
+		closingTimer = new System.Timers.Timer(TimeSpan.FromSeconds(SecondsUntilClose).TotalMilliseconds)
+			{
+				AutoReset = false
+			};
+		closingTimer.Elapsed += new System.Timers.ElapsedEventHandler(OnTimerElapsed);
+
+		closingTimer.Start();
+	}
+
+	private void OnTimerElapsed(object? source, ElapsedEventArgs elapsedEventArgs)
+	{
+		OnClickClose.InvokeAsync();
+	}
+}

Shogi.UI/Shared/TemporaryModal.razor.css

@@ -0,0 +1,64 @@
+/* Grid layout */
+.TemporaryModal {
+	--timeToClose: 3s;
+	display: grid;
+	grid-template-columns: 1fr auto;
+	grid-template-rows: repeat(1fr, 3) auto;
+	grid-template-areas:
+		"content			close"
+		"content			."
+		"countdown		countdown"
+		"helper-text	helper-text";
+	gap: 0.5rem;
+}
+
+.content {
+	grid-area: content;
+}
+
+button.close {
+	grid-area: close;
+}
+
+.countdown {
+	grid-area: countdown;
+}
+
+
+.time-helper-text {
+	grid-area: helper-text;
+}
+
+/* Apperance */
+
+.TemporaryModal {
+	padding: 0.5rem;
+}
+
+.countdown .time-background {
+	background-color: beige;
+	height: 1ch;
+}
+
+.countdown .time {
+	background-color: red;
+	height: 100%;
+	width: 100%;
+	animation: countdown var(--timeToClose) ease-in-out;
+	animation-fill-mode: both;
+}
+
+.countdown .time-helper-text {
+	font-size: 70%;
+	text-align: center;
+}
+
+@keyframes countdown {
+	0% {
+		width: 100%;
+	}
+
+	100% {
+		width: 0
+	}
+}