Trigger Refactor (#39034)

Content.Shared/Trigger/Systems/SharedReleaseGasOnTriggerSystem.cs

@@ -0,0 +1,36 @@
+using Content.Shared.Trigger.Components.Effects;
+using Robust.Shared.Timing;
+
+namespace Content.Shared.Trigger.Systems;
+
+/// <summary>
+/// Releases a gas mixture to the atmosphere when triggered.
+/// Can also release gas over a set timespan to prevent trolling people
+/// with the instant-wall-of-pressure-inator.
+/// </summary>
+public abstract class SharedReleaseGasOnTriggerSystem : EntitySystem
+{
+    [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
+    [Dependency] private readonly IGameTiming _timing = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<ReleaseGasOnTriggerComponent, TriggerEvent>(OnTrigger);
+    }
+
+    /// <summary>
+    /// Shrimply sets the component to active when triggered, allowing it to release over time.
+    /// </summary>
+    private void OnTrigger(Entity<ReleaseGasOnTriggerComponent> ent, ref TriggerEvent args)
+    {
+        if (args.Key != null && !ent.Comp.KeysIn.Contains(args.Key))
+            return;
+
+        ent.Comp.Active = true;
+        ent.Comp.NextReleaseTime = _timing.CurTime;
+        ent.Comp.StartingTotalMoles = ent.Comp.Air.TotalMoles;
+        _appearance.SetData(ent, ReleaseGasOnTriggerVisuals.Key, true);
+    }
+}