Knockdown (#535)

* - add: Better knockdown.

* - add: Some stuff.

* - add: Ghetto alert.

Content.Shared/Standing/Systems/SharedStandingStateSystem.cs

@@ -11,6 +11,7 @@ using Content.Shared._White.Wizard.Timestop;
 using Content.Shared.Buckle;
 using Content.Shared.Buckle.Components;
 using Content.Shared.Mobs;
+using Content.Shared.Movement.Events;
 using Robust.Shared.Audio.Systems;
 using Robust.Shared.Input.Binding;
 using Robust.Shared.Physics;
@@ -52,6 +53,7 @@ public abstract partial class SharedStandingStateSystem : EntitySystem
 
         SubscribeLocalEvent<StandingStateComponent, StandingUpDoAfterEvent>(OnStandingUpDoAfter);
         SubscribeLocalEvent<StandingStateComponent, RefreshMovementSpeedModifiersEvent>(OnRefreshMovementSpeed);
+        SubscribeLocalEvent<StandingStateComponent, TileFrictionEvent>(OnTileFriction);
         SubscribeLocalEvent<StandingStateComponent, SlipAttemptEvent>(OnSlipAttempt);
 
         InitializeColliding();
@@ -98,12 +100,9 @@ public abstract partial class SharedStandingStateSystem : EntitySystem
 
     private void OnStandingUpDoAfter(EntityUid uid, StandingStateComponent component, StandingUpDoAfterEvent args)
     {
-        if (args.Handled || _stun.IsParalyzed(uid)) // WD EDIT
-        {
+        if (args.Handled || args.Cancelled || HasComp<KnockedDownComponent>(uid) ||
+            _mobState.IsIncapacitated(uid) || !Stand(uid)) // WD EDIT
             component.CurrentState = StandingState.Lying;
-            return;
-        }
-        Stand(uid);
     }
 
     private void OnRefreshMovementSpeed(EntityUid uid, StandingStateComponent component,
@@ -115,6 +114,12 @@ public abstract partial class SharedStandingStateSystem : EntitySystem
             args.ModifySpeed(1f, 1f);
     }
 
+    private void OnTileFriction(Entity<StandingStateComponent> ent, ref TileFrictionEvent args)
+    {
+        if (IsDown(ent))
+            args.Modifier *= SharedStunSystem.KnockDownModifier;
+    }
+
     private void OnSlipAttempt(EntityUid uid, StandingStateComponent component, SlipAttemptEvent args)
     {
         if (IsDown(uid))
@@ -217,6 +222,9 @@ public abstract partial class SharedStandingStateSystem : EntitySystem
         if (TryComp(uid, out BuckleComponent? buckle) && buckle.Buckled && !_buckle.TryUnbuckle(uid, uid, buckleComp: buckle)) // WD EDIT
             return false;
 
+        if (standingState.CurrentState is StandingState.Lying or StandingState.GettingUp)
+            return true;
+
         // This is just to avoid most callers doing this manually saving boilerplate
         // 99% of the time you'll want to drop items but in some scenarios (e.g. buckling) you don't want to.
         // We do this BEFORE downing because something like buckle may be blocking downing but we want to drop hand items anyway
@@ -226,9 +234,6 @@ public abstract partial class SharedStandingStateSystem : EntitySystem
             RaiseLocalEvent(uid, new DropHandItemsEvent());
         }
 
-        if (standingState.CurrentState is StandingState.Lying or StandingState.GettingUp)
-            return true;
-
         var msg = new DownAttemptEvent();
         RaiseLocalEvent(uid, msg);