96 lines
2.9 KiB
C#
96 lines
2.9 KiB
C#
using System;
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using UnityEngine;
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namespace Unity.VisualScripting
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{
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[SerializationVersion("A")]
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public sealed class FlowStateTransition : NesterStateTransition<FlowGraph, ScriptGraphAsset>, IGraphEventListener
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{
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public FlowStateTransition() : base() { }
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public FlowStateTransition(IState source, IState destination) : base(source, destination)
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{
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if (!source.canBeSource)
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{
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throw new InvalidOperationException("Source state cannot emit transitions.");
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}
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if (!destination.canBeDestination)
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{
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throw new InvalidOperationException("Destination state cannot receive transitions.");
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}
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}
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public static FlowStateTransition WithDefaultTrigger(IState source, IState destination)
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{
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var flowStateTransition = new FlowStateTransition(source, destination);
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flowStateTransition.nest.source = GraphSource.Embed;
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flowStateTransition.nest.embed = GraphWithDefaultTrigger();
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return flowStateTransition;
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}
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public static FlowGraph GraphWithDefaultTrigger()
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{
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return new FlowGraph()
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{
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units =
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{
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new TriggerStateTransition() { position = new Vector2(100, -50) }
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}
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};
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}
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#region Lifecycle
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public override void OnEnter(Flow flow)
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{
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if (flow.stack.TryEnterParentElement(this))
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{
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flow.stack.TriggerEventHandler(hook => hook == StateEventHooks.OnEnterState, new EmptyEventArgs(), parent => parent is SubgraphUnit, false);
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flow.stack.ExitParentElement();
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}
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}
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public override void OnExit(Flow flow)
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{
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if (flow.stack.TryEnterParentElement(this))
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{
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flow.stack.TriggerEventHandler(hook => hook == StateEventHooks.OnExitState, new EmptyEventArgs(), parent => parent is SubgraphUnit, false);
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nest.graph.StopListening(flow.stack);
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flow.stack.ExitParentElement();
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}
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}
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public void StartListening(GraphStack stack)
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{
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if (stack.TryEnterParentElement(this))
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{
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nest.graph.StartListening(stack);
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stack.ExitParentElement();
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}
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}
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public void StopListening(GraphStack stack)
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{
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if (stack.TryEnterParentElement(this))
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{
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nest.graph.StopListening(stack);
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stack.ExitParentElement();
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}
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}
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public bool IsListening(GraphPointer pointer)
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{
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return pointer.GetElementData<State.Data>(source).isActive;
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}
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#endregion
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public override FlowGraph DefaultGraph()
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{
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return GraphWithDefaultTrigger();
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}
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}
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}
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