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Fixed
Fixed in 2021.3.31f1, 2022.3.10f1, 2023.1.13f1, 2023.2.0b9, 2023.3.0a4
Votes
2
Found in
2021.3.22f1
2021.3.29f1
2022.1.24f1
2022.2.13f1
2023.1.0b10
2023.2.0b4
2023.3.0a1
Issue ID
UUM-32501
Regression
Yes
[UI Builder] NullReferenceException when building custom element tree from uxml
Steps to repro:
1. Create a custom *VisualElement* named {*}TestElement{*}, that has a *Label* as a child element. Since I want to avoid building the visual tree in C#, my class contains the following:
#
using UnityEditor;
#
using UnityEngine.UIElements;
#
#
public class TestElement : VisualElement
#
{
#
public [new|http://www.google.com/search?q=new+msdn.microsoft.com] class UxmlFactory : UxmlFactory<TestElement, UxmlTraits> \{ }
#
#
public TestElement()
#
{
#
VisualTreeAsset uxml = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/Editor/UXML/TestElement.uxml");
#
TemplateContainer root = uxml!.Instantiate();
#
this.hierarchy.Add(root);
#
}
#
}
2. When selecting the Label element in the Hierarchy Panel of the UI Builder, you get a NullReferenceException and the Inspector Panel doesn't refresh all the Label infos correctly.
NullReferenceException: Object reference not set to an instance of an object
Unity.UI.Builder.BuilderInspectorAttributes.RefreshAttributeField (UnityEngine.UIElements.BindableElement fieldElement) (at <415ec9d438ed4f3badc4f75a27f3e7ff>:0)
Unity.UI.Builder.BuilderInspectorAttributes.CreateAttributeRow (UnityEngine.UIElements.UxmlAttributeDescription attribute) (at <415ec9d438ed4f3badc4f75a27f3e7ff>:0)
Unity.UI.Builder.BuilderInspectorAttributes.GenerateAttributeFields () (at <415ec9d438ed4f3badc4f75a27f3e7ff>:0)
Unity.UI.Builder.BuilderInspectorAttributes.Refresh () (at <415ec9d438ed4f3badc4f75a27f3e7ff>:0)
Unity.UI.Builder.BuilderInspector.RefreshUI () (at <415ec9d438ed4f3badc4f75a27f3e7ff>:0)
Unity.UI.Builder.BuilderInspector.SelectionChanged () (at <415ec9d438ed4f3badc4f75a27f3e7ff>:0)
The culprit seems to be:
internal void CloneTree(VisualElement target, Dictionary<string, VisualElement> slotInsertionPoints, List<TemplateAsset.AttributeOverride> attributeOverrides)
... gets called with the attributeOverrides set to null whenever Clone() or Instantiate() is called
-
iletai
Jul 20, 2024 03:02
That issues not yet fix in Unity 2022.3.f1
-
AurochElysia
Jun 26, 2023 11:52
Hello! This would be really useful to have fixed in 2022.x as well :)
-
Gwendal_Broudin_Emoko
May 12, 2023 12:14
This bug prevent us to use UI toolkit on Unity 2021.3 could it be back ported easily or could you provide a workaround ?
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Resolution Note (fix version 2023.3.0a4):
Fixed UUM-32501: UI Toolkit: Fixed selection in custom controls in UI Builder
Resolution Note (fix version 2023.2.0b9):
Fixed UUM-32501: UI Toolkit: Fixed selection in custom controls in UI Builder
Resolution Note (fix version 2023.1.13f1):
Fixed UUM-32501: UI Toolkit: Fixed selection in custom controls in UI Builder
Resolution Note (fix version 2022.3.10f1):
Fixed UUM-32501: UI Toolkit: Fixed selection in custom controls in UI Builder
Resolution Note (fix version 2021.3.31f1):
Fixed UUM-32501: UI Toolkit: Fixed selection in custom controls in UI Builder