Airlock visuals (#7261)

Content.Client/AirlockPainter/AirlockPainterSystem.cs

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+using Content.Shared.AirlockPainter;
+using Robust.Client.Graphics;
+using Robust.Client.ResourceManagement;
+using Robust.Shared.Utility;
+using System.Linq;
+using static Robust.Shared.GameObjects.SharedSpriteComponent;
+
+namespace Content.Client.AirlockPainter
+{
+    public sealed class AirlockPainterSystem : SharedAirlockPainterSystem
+    {
+        [Dependency] private readonly IResourceCache _resourceCache = default!;
+
+        public List<AirlockPainterEntry> Entries { get; private set; } = new();
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            foreach (string style in Styles)
+            {
+                string? iconPath = Groups
+                  .FindAll(x => x.StylePaths.ContainsKey(style))?
+                  .MaxBy(x => x.IconPriority)?.StylePaths[style];
+                if (iconPath == null)
+                {
+                    Entries.Add(new AirlockPainterEntry(style, null));
+                    continue;
+                }
+
+                RSIResource doorRsi = _resourceCache.GetResource<RSIResource>(TextureRoot / new ResourcePath(iconPath));
+                if (!doorRsi.RSI.TryGetState("closed", out var icon))
+                {
+                    Entries.Add(new AirlockPainterEntry(style, null));
+                    continue;
+                }
+
+                Entries.Add(new AirlockPainterEntry(style, icon.Frame0));
+            }
+        }
+    }
+
+    public sealed class AirlockPainterEntry
+    {
+        public string Name;
+        public Texture? Icon;
+
+        public AirlockPainterEntry(string name, Texture? icon)
+        {
+            Name = name;
+            Icon = icon;
+        }
+    }
+}

Content.Client/AirlockPainter/UI/AirlockPainterBoundUserInterface.cs

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+using Content.Shared.AirlockPainter;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.AirlockPainter.UI
+{
+    public sealed class AirlockPainterBoundUserInterface : BoundUserInterface
+    {
+        private AirlockPainterWindow? _window;
+        public List<string> Styles = new();
+
+        public AirlockPainterBoundUserInterface(ClientUserInterfaceComponent owner, object uiKey) : base(owner, uiKey)
+        {
+        }
+
+        protected override void Open()
+        {
+            base.Open();
+
+            _window = new AirlockPainterWindow();
+            if (State != null)
+                UpdateState(State);
+
+            // Add styles
+            var painterSystem = EntitySystem.Get<AirlockPainterSystem>();
+            _window.Populate(painterSystem.Entries);
+
+            _window.OpenCentered();
+
+            _window.OnClose += Close;
+            _window.OnSpritePicked += OnSpritePicked;
+        }
+
+        private void OnSpritePicked(int index)
+        {
+            SendMessage(new AirlockPainterSpritePickedMessage(index));
+        }
+    }
+}

Content.Client/AirlockPainter/UI/AirlockPainterWindow.xaml

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+<DefaultWindow xmlns="https://spacestation14.io"
+            MinSize="300 300"
+            SetSize="300 300"
+            Title="{Loc 'airlock-painter-window-title'}">
+    <BoxContainer Orientation="Vertical" SeparationOverride="4" MinWidth="150">
+        <Label Name="SelectedSpriteLabel"
+               Text="{Loc 'airlock-painter-selected-style'}">
+        </Label>
+        <ItemList Name="SpriteList"
+                  SizeFlagsStretchRatio="8"
+                  VerticalExpand="True">
+        </ItemList>
+    </BoxContainer>
+</DefaultWindow>

Content.Client/AirlockPainter/UI/AirlockPainterWindow.xaml.cs

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+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+
+namespace Content.Client.AirlockPainter.UI
+{
+    [GenerateTypedNameReferences]
+    public sealed partial class AirlockPainterWindow : DefaultWindow
+    {
+        public event Action<int>? OnSpritePicked;
+
+        public AirlockPainterWindow()
+        {
+            RobustXamlLoader.Load(this);
+
+            SpriteList.OnItemSelected += e => OnSpritePicked?.Invoke(e.ItemIndex);
+        }
+
+        public void Populate(List<AirlockPainterEntry> entries)
+        {
+            SpriteList.Clear();
+            foreach (var entry in entries)
+            {
+                SpriteList.AddItem(entry.Name, entry.Icon);
+            }
+        }
+    }
+}