Status Icons (#17529)

Content.Client/StatusIcon/StatusIconSystem.cs

@@ -0,0 +1,66 @@
+using Content.Shared.CCVar;
+using Content.Shared.StatusIcon;
+using Content.Shared.StatusIcon.Components;
+using Robust.Client.Graphics;
+using Robust.Shared.Configuration;
+
+namespace Content.Client.StatusIcon;
+
+/// <summary>
+/// This handles rendering gathering and rendering icons on entities.
+/// </summary>
+public sealed class StatusIconSystem : SharedStatusIconSystem
+{
+    [Dependency] private readonly IConfigurationManager _configuration = default!;
+    [Dependency] private readonly IOverlayManager _overlay = default!;
+
+    private bool _globalEnabled;
+    private bool _localEnabled;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        _configuration.OnValueChanged(CCVars.LocalStatusIconsEnabled, OnLocalStatusIconChanged, true);
+        _configuration.OnValueChanged(CCVars.GlobalStatusIconsEnabled, OnGlobalStatusIconChanged, true);
+    }
+
+    public override void Shutdown()
+    {
+        base.Shutdown();
+
+        _configuration.UnsubValueChanged(CCVars.LocalStatusIconsEnabled, OnLocalStatusIconChanged);
+        _configuration.UnsubValueChanged(CCVars.GlobalStatusIconsEnabled, OnGlobalStatusIconChanged);
+    }
+
+    private void OnLocalStatusIconChanged(bool obj)
+    {
+        _localEnabled = obj;
+        UpdateOverlayVisible();
+    }
+
+    private void OnGlobalStatusIconChanged(bool obj)
+    {
+        _globalEnabled = obj;
+        UpdateOverlayVisible();
+    }
+
+    private void UpdateOverlayVisible()
+    {
+        if (_overlay.RemoveOverlay<StatusIconOverlay>())
+            return;
+
+        if (_globalEnabled && _localEnabled)
+            _overlay.AddOverlay(new StatusIconOverlay());
+    }
+
+    public List<StatusIconData> GetStatusIcons(EntityUid uid)
+    {
+        if (!Exists(uid) || Terminating(uid))
+            return new();
+
+        var ev = new GetStatusIconsEvent(new());
+        RaiseLocalEvent(uid, ref ev);
+        return ev.StatusIcons;
+    }
+}
+