89 lines
2.6 KiB
C#
89 lines
2.6 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2021 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using System.Collections.Generic;
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using System.Linq;
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using OpenRA.Traits;
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namespace OpenRA.Mods.Common.Traits
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{
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[Desc("Applies a condition to connected line build segments.")]
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public class LineBuildSegmentExternalConditionInfo : ConditionalTraitInfo, Requires<LineBuildInfo>
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{
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[FieldLoader.Require]
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[Desc("The condition to apply. Must be included in the target actor's ExternalConditions list.")]
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public readonly string Condition = null;
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public override object Create(ActorInitializer init) { return new LineBuildSegmentExternalCondition(this); }
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}
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public class LineBuildSegmentExternalCondition : ConditionalTrait<LineBuildSegmentExternalConditionInfo>, INotifyLineBuildSegmentsChanged
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{
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readonly HashSet<Actor> segments = new HashSet<Actor>();
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readonly Dictionary<Actor, int> tokens = new Dictionary<Actor, int>();
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public LineBuildSegmentExternalCondition(LineBuildSegmentExternalConditionInfo info)
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: base(info) { }
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void GrantCondition(Actor self, Actor segment)
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{
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if (tokens.ContainsKey(segment))
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return;
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var external = segment.TraitsImplementing<ExternalCondition>()
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.FirstOrDefault(t => t.Info.Condition == Info.Condition && t.CanGrantCondition(segment));
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if (external != null)
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tokens[segment] = external.GrantCondition(segment, self);
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}
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void RevokeCondition(Actor self, Actor segment)
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{
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if (!tokens.TryGetValue(segment, out var token))
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return;
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tokens.Remove(segment);
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if (segment.Disposed)
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return;
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foreach (var external in segment.TraitsImplementing<ExternalCondition>())
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if (external.TryRevokeCondition(segment, self, token))
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break;
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}
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void INotifyLineBuildSegmentsChanged.SegmentAdded(Actor self, Actor segment)
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{
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segments.Add(segment);
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if (!IsTraitDisabled)
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GrantCondition(self, segment);
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}
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void INotifyLineBuildSegmentsChanged.SegmentRemoved(Actor self, Actor segment)
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{
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if (!IsTraitDisabled)
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RevokeCondition(self, segment);
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segments.Remove(segment);
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}
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protected override void TraitEnabled(Actor self)
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{
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foreach (var s in segments)
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GrantCondition(self, s);
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}
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protected override void TraitDisabled(Actor self)
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{
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foreach (var s in segments)
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RevokeCondition(self, s);
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}
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}
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}
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