73 lines
2.4 KiB
C#
73 lines
2.4 KiB
C#
using Robust.Shared.Physics.Events;
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using Robust.Shared.Physics.Systems;
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using System.Linq;
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namespace Content.Shared.Placeable;
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/// <summary>
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/// Tracks placed entities
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/// Subscribe to <see cref="ItemPlacedEvent"/> or <see cref="ItemRemovedEvent"/> to do things when items or placed or removed.
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/// </summary>
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public sealed class ItemPlacerSystem : EntitySystem
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{
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[Dependency] private readonly PlaceableSurfaceSystem _placeableSurface = default!;
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[Dependency] private readonly SharedPhysicsSystem _physics = default!;
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public override void Initialize()
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{
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base.Initialize();
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SubscribeLocalEvent<ItemPlacerComponent, StartCollideEvent>(OnStartCollide);
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SubscribeLocalEvent<ItemPlacerComponent, EndCollideEvent>(OnEndCollide);
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}
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private void OnStartCollide(EntityUid uid, ItemPlacerComponent comp, ref StartCollideEvent args)
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{
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if (comp.Whitelist != null && !comp.Whitelist.IsValid(args.OtherEntity))
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return;
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// Disallow sleeping so we can detect when entity is removed from the heater.
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_physics.SetSleepingAllowed(args.OtherEntity, args.OtherBody, false);
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var count = comp.PlacedEntities.Count;
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if (comp.MaxEntities == 0 || count < comp.MaxEntities)
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{
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comp.PlacedEntities.Add(args.OtherEntity);
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var ev = new ItemPlacedEvent(args.OtherEntity);
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RaiseLocalEvent(uid, ref ev);
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}
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if (comp.MaxEntities > 0 && count >= (comp.MaxEntities - 1))
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{
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// Don't let any more items be placed if it's reached its limit.
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_placeableSurface.SetPlaceable(uid, false);
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}
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}
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private void OnEndCollide(EntityUid uid, ItemPlacerComponent comp, ref EndCollideEvent args)
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{
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// Re-allow sleeping.
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_physics.SetSleepingAllowed(args.OtherEntity, args.OtherBody, true);
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comp.PlacedEntities.Remove(args.OtherEntity);
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var ev = new ItemRemovedEvent(args.OtherEntity);
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RaiseLocalEvent(uid, ref ev);
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_placeableSurface.SetPlaceable(uid, true);
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}
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}
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/// <summary>
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/// Raised on the <see cref="ItemPlacer"/> when an item is placed and it is under the item limit.
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/// </summary>
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[ByRefEvent]
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public record struct ItemPlacedEvent(EntityUid OtherEntity);
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/// <summary>
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/// Raised on the <see cref="ItemPlacer"/> when an item is removed from it.
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/// </summary>
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[ByRefEvent]
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public record struct ItemRemovedEvent(EntityUid OtherEntity);
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