TimelineUndo.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using UnityEngine.Playables;
#if UNITY_EDITOR
using UnityEditor;
#endif
namespace UnityEngine.Timeline
{
static class TimelineUndo
{
public static void PushDestroyUndo(TimelineAsset timeline, Object thingToDirty, Object objectToDestroy)
{
#if UNITY_EDITOR
if (objectToDestroy == null || !DisableUndoGuard.enableUndo)
return;
if (thingToDirty != null)
EditorUtility.SetDirty(thingToDirty);
if (timeline != null)
EditorUtility.SetDirty(timeline);
Undo.DestroyObjectImmediate(objectToDestroy);
#else
if (objectToDestroy != null)
Object.Destroy(objectToDestroy);
#endif
}
[Conditional("UNITY_EDITOR")]
public static void PushUndo(Object[] thingsToDirty, string operation)
{
#if UNITY_EDITOR
if (thingsToDirty == null || !DisableUndoGuard.enableUndo)
return;
for (var i = 0; i < thingsToDirty.Length; i++)
{
if (thingsToDirty[i] is TrackAsset track)
track.MarkDirty();
EditorUtility.SetDirty(thingsToDirty[i]);
}
Undo.RegisterCompleteObjectUndo(thingsToDirty, UndoName(operation));
#endif
}
[Conditional("UNITY_EDITOR")]
public static void PushUndo(Object thingToDirty, string operation)
{
#if UNITY_EDITOR
if (thingToDirty != null && DisableUndoGuard.enableUndo)
{
var track = thingToDirty as TrackAsset;
if (track != null)
track.MarkDirty();
EditorUtility.SetDirty(thingToDirty);
Undo.RegisterCompleteObjectUndo(thingToDirty, UndoName(operation));
}
#endif
}
[Conditional("UNITY_EDITOR")]
public static void RegisterCreatedObjectUndo(Object thingCreated, string operation)
{
#if UNITY_EDITOR
if (DisableUndoGuard.enableUndo)
{
Undo.RegisterCreatedObjectUndo(thingCreated, UndoName(operation));
}
#endif
}
private static string UndoName(string name) => "Timeline " + name;
#if UNITY_EDITOR
internal struct DisableUndoGuard : IDisposable
{
internal static bool enableUndo = true;
static readonly Stack<bool> m_UndoStateStack = new Stack<bool>();
bool m_Disposed;
public DisableUndoGuard(bool disable)
{
m_Disposed = false;
m_UndoStateStack.Push(enableUndo);
enableUndo = !disable;
}
public void Dispose()
{
if (!m_Disposed)
{
if (m_UndoStateStack.Count == 0)
{
Debug.LogError("UnMatched DisableUndoGuard calls");
enableUndo = true;
return;
}
enableUndo = m_UndoStateStack.Pop();
m_Disposed = true;
}
}
}
#endif
}
}