File size: 5,939 Bytes
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using UnityEngine.Playables;
using UnityEngine.SceneManagement;
namespace UnityEngine.Timeline
{
/// <summary>
/// Playable that controls and instantiates a Prefab.
/// </summary>
public class PrefabControlPlayable : PlayableBehaviour
{
GameObject m_Instance;
#if UNITY_EDITOR
private bool m_IsActiveCached;
#endif
/// <summary>
/// Creates a Playable with a PrefabControlPlayable behaviour attached
/// </summary>
/// <param name="graph">The PlayableGraph to inject the Playable into.</param>
/// <param name="prefabGameObject">The prefab to instantiate from</param>
/// <param name="parentTransform">Transform to parent instance to. Can be null.</param>
/// <returns>Returns a Playabe with PrefabControlPlayable behaviour attached.</returns>
public static ScriptPlayable<PrefabControlPlayable> Create(PlayableGraph graph, GameObject prefabGameObject, Transform parentTransform)
{
if (prefabGameObject == null)
return ScriptPlayable<PrefabControlPlayable>.Null;
var handle = ScriptPlayable<PrefabControlPlayable>.Create(graph);
handle.GetBehaviour().Initialize(prefabGameObject, parentTransform);
return handle;
}
/// <summary>
/// The instance of the prefab created by this behaviour
/// </summary>
public GameObject prefabInstance
{
get { return m_Instance; }
}
/// <summary>
/// Initializes the behaviour with a prefab and parent transform
/// </summary>
/// <param name="prefabGameObject">The prefab to instantiate from</param>
/// <param name="parentTransform">Transform to parent instance to. Can be null.</param>
/// <returns>The created instance</returns>
public GameObject Initialize(GameObject prefabGameObject, Transform parentTransform)
{
if (prefabGameObject == null)
throw new ArgumentNullException("Prefab cannot be null");
if (m_Instance != null)
{
Debug.LogWarningFormat("Prefab Control Playable ({0}) has already been initialized with a Prefab ({1}).", prefabGameObject.name, m_Instance.name);
}
else
{
#if UNITY_EDITOR
if (!Application.isPlaying)
{
m_Instance = (GameObject)UnityEditor.PrefabUtility.InstantiatePrefab(prefabGameObject, parentTransform);
UnityEditor.PrefabUtility.prefabInstanceUpdated += OnPrefabUpdated;
}
else
#endif
{
m_Instance = Object.Instantiate(prefabGameObject, parentTransform, false);
}
m_Instance.name = prefabGameObject.name + " [Timeline]";
m_Instance.SetActive(false);
SetHideFlagsRecursive(m_Instance);
}
return m_Instance;
}
/// <summary>
/// This function is called when the Playable that owns the PlayableBehaviour is destroyed.
/// </summary>
/// <param name="playable">The playable this behaviour is attached to.</param>
public override void OnPlayableDestroy(Playable playable)
{
if (m_Instance)
{
if (Application.isPlaying)
Object.Destroy(m_Instance);
else
Object.DestroyImmediate(m_Instance);
}
#if UNITY_EDITOR
UnityEditor.PrefabUtility.prefabInstanceUpdated -= OnPrefabUpdated;
#endif
}
/// <summary>
/// This function is called when the Playable play state is changed to Playables.PlayState.Playing.
/// </summary>
/// <param name="playable">The Playable that owns the current PlayableBehaviour.</param>
/// <param name="info">A FrameData structure that contains information about the current frame context.</param>
public override void OnBehaviourPlay(Playable playable, FrameData info)
{
if (m_Instance == null)
return;
m_Instance.SetActive(true);
#if UNITY_EDITOR
m_IsActiveCached = true;
#endif
}
/// <summary>
/// This function is called when the Playable play state is changed to PlayState.Paused.
/// </summary>
/// <param name="playable">The playable this behaviour is attached to.</param>
/// <param name="info">A FrameData structure that contains information about the current frame context.</param>
public override void OnBehaviourPause(Playable playable, FrameData info)
{
// OnBehaviourPause can be called if the graph is stopped for a variety of reasons
// the effectivePlayState will test if the pause is due to the clip being out of bounds
if (m_Instance != null && info.effectivePlayState == PlayState.Paused)
{
m_Instance.SetActive(false);
#if UNITY_EDITOR
m_IsActiveCached = false;
#endif
}
}
#if UNITY_EDITOR
void OnPrefabUpdated(GameObject go)
{
if (go == m_Instance)
{
SetHideFlagsRecursive(go);
go.SetActive(m_IsActiveCached);
}
}
#endif
static void SetHideFlagsRecursive(GameObject gameObject)
{
if (gameObject == null)
return;
gameObject.hideFlags = HideFlags.DontSaveInBuild | HideFlags.DontSaveInEditor;
if (!Application.isPlaying)
gameObject.hideFlags |= HideFlags.HideInHierarchy;
foreach (Transform child in gameObject.transform)
{
SetHideFlagsRecursive(child.gameObject);
}
}
}
}
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