Added a /tab command

MinecraftClient/Tui/TabListOverlay.cs

@@ -0,0 +1,92 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.Layout;
+using Avalonia.Media;
+using Avalonia.Threading;
+
+namespace MinecraftClient.Tui
+{
+    internal sealed class TabListOverlay : Border
+    {
+        private readonly McClient _handler;
+        private readonly ScrollViewer _scrollViewer;
+        private readonly DispatcherTimer _refreshTimer;
+
+        public TabListOverlay(McClient handler)
+        {
+            ArgumentNullException.ThrowIfNull(handler);
+            _handler = handler;
+
+            BorderBrush = Brushes.White;
+            BorderThickness = new Thickness(1);
+            Background = Brushes.Black;
+            Padding = new Thickness(1);
+            HorizontalAlignment = HorizontalAlignment.Stretch;
+            VerticalAlignment = VerticalAlignment.Stretch;
+            Focusable = true;
+
+            _scrollViewer = new ScrollViewer
+            {
+                HorizontalScrollBarVisibility = ScrollBarVisibility.Auto,
+                VerticalScrollBarVisibility = ScrollBarVisibility.Auto,
+                Focusable = true,
+            };
+
+            Child = _scrollViewer;
+
+            _refreshTimer = new DispatcherTimer(TimeSpan.FromMilliseconds(500), DispatcherPriority.Background, static (_, _) => { })
+            {
+                IsEnabled = false
+            };
+            _refreshTimer.Tick += (_, _) => Refresh();
+
+            AttachedToVisualTree += (_, _) =>
+            {
+                AddHandler(KeyDownEvent, OnTunnelKeyDown, RoutingStrategies.Tunnel);
+                Refresh();
+                _refreshTimer.Start();
+                Focus();
+                Dispatcher.UIThread.Post(() => _scrollViewer.Focus(), DispatcherPriority.Input);
+            };
+
+            DetachedFromVisualTree += (_, _) =>
+            {
+                RemoveHandler(KeyDownEvent, OnTunnelKeyDown);
+                _refreshTimer.Stop();
+            };
+        }
+
+        private void OnTunnelKeyDown(object? sender, KeyEventArgs e)
+        {
+            if (e.Key != Key.Escape)
+                return;
+
+            TuiConsoleBackend.Instance?.DismissOverlay();
+            e.Handled = true;
+        }
+
+        protected override void OnKeyDown(KeyEventArgs e)
+        {
+            if (e.Key == Key.Escape)
+            {
+                TuiConsoleBackend.Instance?.DismissOverlay();
+                e.Handled = true;
+                return;
+            }
+
+            base.OnKeyDown(e);
+        }
+
+        private void Refresh()
+        {
+            string text = TabListFormatter.Render(_handler.GetTabListSnapshot(), includeOverlayHint: true);
+            var block = McColorParser.CreateColoredTextBlock(text, TextWrapping.NoWrap);
+            block.Margin = new Thickness(0);
+            _scrollViewer.Content = block;
+        }
+    }
+}