// 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));
}
private bool InternalAdd(GuidComponent guidComponent)
{
Guid guid = guidComponent.GetGuid();
GuidInfo info = new GuidInfo(guidComponent);
if (!guidToObjectMap.ContainsKey(guid))
{
guidToObjectMap.Add(guid, info);
return(true);
}
GuidInfo existingInfo = guidToObjectMap[guid];
if (existingInfo.go != null && existingInfo.go != guidComponent.gameObject)
{
// normally, a duplicate GUID is a big problem, means you won't necessarily be referencing what you expect
if (Application.isPlaying)
{
Debug.AssertFormat(false, guidComponent, "Guid Collision Detected between {0} and {1}.\nAssigning new Guid. Consider tracking runtime instances using a direct reference or other method.", (guidToObjectMap[guid].go != null ? guidToObjectMap[guid].go.name : "NULL"), (guidComponent != null ? guidComponent.name : "NULL"));
}
else
{
// however, at editor time, copying an object with a GUID will duplicate the GUID resulting in a collision and repair.
// we warn about this just for pedantry reasons, and so you can detect if you are unexpectedly copying these components
Debug.LogWarningFormat(guidComponent, "Guid Collision Detected while creating {0}.\nAssigning new Guid.", (guidComponent != null ? guidComponent.name : "NULL"));
}
return(false);
}
// if we already tried to find this GUID, but haven't set the game object to anything specific, copy any OnAdd callbacks then call them
existingInfo.go = info.go;
existingInfo.HandleAddCallback();
guidToObjectMap[guid] = existingInfo;
return(true);
}
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();
}
public GuidReference(GuidComponent target)
{
guid = target.GetGuid();
}
public GuidInfo(GuidComponent comp)
{
go = comp.gameObject;
OnRemove = null;
OnAdd = null;
}
private void OnEnable()
{
guidComp = (GuidComponent)target;
}
