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By Design
Votes
1
Found in
2022.3.50f1
6000.0.23f1
Issue ID
UUM-84303
Regression
No
RegisterValueChangedCallback gets called on the last element of a list when any element is changed
Reproduction steps:
1. Open the attached “BugRepro” project
2. Open the “Assets/Scenes/SampleScene” Scene
3. In the Hierarchy window, select “TestObject” GameObject
4. In the Inspector, add 2 elements to the “Test List” in the “Test Component” Component
5. Enable the checkbox of the first element in the List
6. Observe the elements in the list and the Console
Expected result: “ToggleProperty in callback _testList.Array.data[0].TestBool“ is logged in the Console and a text field appears in the first element
Actual result: “ToggleProperty in callback _testList.Array.data[1].TestBool“ is logged and the text field appears in the second element
Reproducible with: 2022.3.50f1, 6000.0.23f1
Couldn't test with: 2021.3.45f1 (The elements do not have checkboxes and “No GUI Implemented” is written instead)
Reproducible on: Windows 11
Not reproducible on: No other environments tested
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Resolution Note:
For CustomPropertyDrawers on list or arrays, CreatePropertyGUI is called per item, but the drawer is shared for all items. So any reference that is held will be shared across items. See the note about lists on this page: https://docs.unity3d.com/ScriptReference/PropertyDrawer.html
References are kept in the user code (_toggleProperty, _testContainer, etc.). So they will all share the reference set during the last item's CreatePropertyGUI. To solve that, you can store references in a struct held in a dictionary per property path, or keep a context using VisualElement.userData on the element created by the drawer. For more info, you can reach out to us on https://discussions.unity.com/tag/ui-toolkit