playtest-unity/playtest/Library/PackageCache/com.unity.visualscripting@1.../Runtime/VisualScripting.State/FlowStateTransition.cs

96 lines
2.9 KiB
C#

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