AnimatorController.FindStateMachineBehaviourContext

Parameters

Returns

StateMachineBehaviourContext[] Returns the State Machine Behaviour edition context.

Description

Use this function to retrieve the owner of this behaviour.

Please note that this function is very slow. It is not recommended to use this function every frame. Additional resources: StateMachineBehaviourContext.

using UnityEngine;
using UnityEditor;


public class IdleBehaviour : StateMachineBehaviour
{
    public int transitionCount;
    protected int randomTransitionId = Animator.StringToHash("random");

    // OnStateEnter is called when a transition starts and the state machine starts to evaluate the state
    override public void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
    }

    // OnStateUpdate is called at each engine tick between OnStateEnter and OnStateExit callback
    override public void OnStateUpdate(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
        if (stateInfo.normalizedTime > 0.5f)
            animator.SetInteger(randomTransitionId, Random.Range(0, transitionCount));
    }

    // OnStateExit is called when a transition ends and the state machine ends to evaluate the state
    override public void OnStateExit(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
    }
}

[CustomEditor(typeof(IdleBehaviour), true)]
public class IdleBehaviourEditor : Editor
{
    UnityEditor.Animations.StateMachineBehaviourContext[] context;

    SerializedProperty transitionCount;

    public void OnEnable()
    {
        context = UnityEditor.Animations.AnimatorController.FindStateMachineBehaviourContext(target as StateMachineBehaviour);
        if (context != null)
        {
            // animatorObject can be an AnimatorState or AnimatorStateMachine
            UnityEditor.Animations.AnimatorState state = context[0].animatorObject as UnityEditor.Animations.AnimatorState;
            if (state != null)
            {
                IdleBehaviour behaviour = target as IdleBehaviour;
                behaviour.transitionCount = state.transitions.Length;
            }
        }

        transitionCount = serializedObject.FindProperty("transitionCount");
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();

        EditorGUI.BeginDisabledGroup(true);
        EditorGUILayout.PropertyField(transitionCount);
        EditorGUI.EndDisabledGroup();

        serializedObject.ApplyModifiedProperties();
    }
}