public static GameObject ResolveGuid(System.Guid guid)
{
if (Instance == null)
{
Instance = new GuidManager();
}
return(Instance.ResolveGuidInternal(guid, null, null));
}
public static GameObject ResolveGuid(System.Guid guid, Action onDestroyCallback)
{
if (Instance == null)
{
Instance = new GuidManager();
}
return(Instance.ResolveGuidInternal(guid, null, onDestroyCallback));
}
public static GameObject ResolveGuid(System.Guid guid, Action <GameObject> onAddCallback, Action onRemoveCallback)
{
if (Instance == null)
{
Instance = new GuidManager();
}
return(Instance.ResolveGuidInternal(guid, onAddCallback, onRemoveCallback));
}
public static void Remove(System.Guid guid)
{
if (Instance == null)
{
Instance = new GuidManager();
}
Instance.InternalRemove(guid);
}
// All the public API is static so you need not worry about creating an instance
public static bool Add(GuidComponent guidComponent)
{
if (Instance == null)
{
Instance = new GuidManager();
}
return(Instance.InternalAdd(guidComponent));
}
// When de-serializing or creating this component, we want to either restore our serialized GUID
// or create a new one.
void CreateGuid()
{
// if our serialized data is invalid, then we are a new object and need a new GUID
if (serializedGuid == null || serializedGuid.Length != 16)
{
#if UNITY_EDITOR
// if in editor, make sure we aren't a prefab of some kind
if (IsAssetOnDisk())
{
return;
}
Undo.RecordObject(this, "Added GUID");
#endif
guid = System.Guid.NewGuid();
serializedGuid = guid.ToByteArray();
#if UNITY_EDITOR
// If we are creating a new GUID for a prefab instance of a prefab, but we have somehow lost our prefab connection
// force a save of the modified prefab instance properties
if (PrefabUtility.IsPartOfNonAssetPrefabInstance(this))
{
PrefabUtility.RecordPrefabInstancePropertyModifications(this);
}
#endif
}
else if (guid == System.Guid.Empty)
{
// otherwise, we should set our system guid to our serialized guid
guid = new System.Guid(serializedGuid);
}
// register with the GUID Manager so that other components can access this
if (guid != System.Guid.Empty)
{
if (!GuidManager.Add(this))
{
// if registration fails, we probably have a duplicate or invalid GUID, get us a new one.
serializedGuid = null;
guid = System.Guid.Empty;
CreateGuid();
}
}
}
public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
{
guidProp = property.FindPropertyRelative("serializedGuid");
nameProp = property.FindPropertyRelative("cachedName");
sceneProp = property.FindPropertyRelative("cachedScene");
// Using BeginProperty / EndProperty on the parent property means that
// prefab override logic works on the entire property.
EditorGUI.BeginProperty(position, label, property);
position.height = EditorGUIUtility.singleLineHeight;
// Draw prefix label, returning the new rect we can draw in
var guidCompPosition = EditorGUI.PrefixLabel(position, GUIUtility.GetControlID(FocusType.Passive), label);
System.Guid currentGuid;
GameObject currentGO = null;
// working with array properties is a bit unwieldy
// you have to get the property at each index manually
byte[] byteArray = new byte[16];
int arraySize = guidProp.arraySize;
for (int i = 0; i < arraySize; ++i)
{
var byteProp = guidProp.GetArrayElementAtIndex(i);
byteArray[i] = (byte)byteProp.intValue;
}
currentGuid = new System.Guid(byteArray);
currentGO = GuidManager.ResolveGuid(currentGuid);
GuidComponent currentGuidComponent = currentGO != null?currentGO.GetComponent <GuidComponent>() : null;
GuidComponent component = null;
if (currentGuid != System.Guid.Empty && currentGuidComponent == null)
{
// if our reference is set, but the target isn't loaded, we display the target and the scene it is in, and provide a way to clear the reference
float buttonWidth = 55.0f;
guidCompPosition.xMax -= buttonWidth;
bool guiEnabled = GUI.enabled;
GUI.enabled = false;
EditorGUI.LabelField(guidCompPosition, new GUIContent(nameProp.stringValue, "Target GameObject is not currently loaded."), EditorStyles.objectField);
GUI.enabled = guiEnabled;
Rect clearButtonRect = new Rect(guidCompPosition);
clearButtonRect.xMin = guidCompPosition.xMax;
clearButtonRect.xMax += buttonWidth;
if (GUI.Button(clearButtonRect, clearButtonGUI, EditorStyles.miniButton))
{
ClearPreviousGuid();
}
}
else
{
// if our object is loaded, we can simply use an object field directly
component = EditorGUI.ObjectField(guidCompPosition, currentGuidComponent, typeof(GuidComponent), true) as GuidComponent;
}
if (currentGuidComponent != null && component == null)
{
ClearPreviousGuid();
}
// if we have a valid reference, draw the scene name of the scene it lives in so users can find it
if (component != null)
{
nameProp.stringValue = component.name;
string scenePath = component.gameObject.scene.path;
sceneProp.objectReferenceValue = AssetDatabase.LoadAssetAtPath <SceneAsset>(scenePath);
// only update the GUID Prop if something changed. This fixes multi-edit on GUID References
if (component != currentGuidComponent)
{
byteArray = component.GetGuid().ToByteArray();
arraySize = guidProp.arraySize;
for (int i = 0; i < arraySize; ++i)
{
var byteProp = guidProp.GetArrayElementAtIndex(i);
byteProp.intValue = byteArray[i];
}
}
}
EditorGUI.indentLevel++;
position.y += EditorGUIUtility.singleLineHeight;
bool cachedGUIState = GUI.enabled;
GUI.enabled = false;
EditorGUI.ObjectField(position, sceneLabel, sceneProp.objectReferenceValue, typeof(SceneAsset), false);
GUI.enabled = cachedGUIState;
EditorGUI.indentLevel--;
EditorGUI.EndProperty();
}
// let the manager know we are gone, so other objects no longer find this
public void OnDestroy()
{
GuidManager.Remove(guid);
}