File size: 2,974 Bytes
18a519f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | 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();
}
}
}
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