signaller can be used as a payload (#14827)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/MachineLinking/System/SignallerSystem.cs

@@ -1,31 +1,49 @@
+using Content.Server.Explosion.EntitySystems;
 using Content.Server.MachineLinking.Components;
-using JetBrains.Annotations;
 using Content.Shared.Interaction.Events;
+using Content.Shared.Timing;
+
+namespace Content.Server.MachineLinking.System;
 
-namespace Content.Server.MachineLinking.System
-{
-    [UsedImplicitly]
 public sealed class SignallerSystem : EntitySystem
 {
-        [Dependency] private readonly SignalLinkerSystem _signalSystem = default!;
+    [Dependency] private readonly SignalLinkerSystem _signal = default!;
+    [Dependency] private readonly UseDelaySystem _useDelay = default!;
+
     public override void Initialize()
     {
         base.Initialize();
+
         SubscribeLocalEvent<SignallerComponent, ComponentInit>(OnInit);
         SubscribeLocalEvent<SignallerComponent, UseInHandEvent>(OnUseInHand);
+        SubscribeLocalEvent<SignallerComponent, TriggerEvent>(OnTrigger);
     }
 
     private void OnInit(EntityUid uid, SignallerComponent component, ComponentInit args)
     {
-            _signalSystem.EnsureTransmitterPorts(uid, component.Port);
+        _signal.EnsureTransmitterPorts(uid, component.Port);
     }
 
     private void OnUseInHand(EntityUid uid, SignallerComponent component, UseInHandEvent args)
     {
         if (args.Handled)
             return;
-            _signalSystem.InvokePort(uid, component.Port);
+        _signal.InvokePort(uid, component.Port);
+        args.Handled = true;
+    }
+
+    private void OnTrigger(EntityUid uid, SignallerComponent component, TriggerEvent args)
+    {
+        // if on cooldown, do nothing
+        var hasUseDelay = TryComp<UseDelayComponent>(uid, out var useDelay);
+        if (hasUseDelay && _useDelay.ActiveDelay(uid, useDelay))
+            return;
+
+        // set cooldown to prevent clocks
+        if (hasUseDelay)
+            _useDelay.BeginDelay(uid, useDelay);
+
+        _signal.InvokePort(uid, component.Port);
         args.Handled = true;
     }
 }
-}

Resources/Prototypes/Entities/Objects/Devices/Electronics/signaller.yml

@@ -16,3 +16,6 @@
   - type: SignalTransmitter
     outputs:
       Pressed: []
+  - type: Tag
+    tags:
+    - Payload