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Fixed
Votes
0
Found in [Package]
1.0.0-preview.9
Issue ID
1292209
Regression
No
[UI Toolkit] NullReferenceException thrown when element drag and drop from Hierarchy to Viewport in the UI Builder window
When Element drag and drop from Hierarchy to Viewport in the UI Builder window then it causes the editor to throw NullReferenceException, Refer to the attached video.
Steps to repro:
1. Create a new project
2. Window > UI Toolkit > UI Builder
3. Library > Button > right-click > Add
4. Hierarchy > Button > Drag and Drop to > Viewport
Actual Result:
NullReferenceException is thrown when Element(Button) drag and drop to Viewport from Hierarchy
Expected Result:
The element should be drag and drop gracefully and create duplicate of existed element
Note:
UI Toolkit package introduced in the Unity 2020.1.0b12
UI toolkit is core package onwards 2021.1.0a5
Reproducible in:
2021.1.0a5, 2020.2.0b11, 2020.1.12f1, 2020.1.0b12with package version 1.0.0-preview.9, 1.0.0-preview.1, 0.11.2-preview
Environment:
Occurring on Windows 10 & macOS 10.15.
Stack trace:
NullReferenceException: Object reference not set to an instance of an object
Unity.UI.Builder.BuilderHierarchyDragger.PerformAction (UnityEngine.UIElements.VisualElement destination, Unity.UI.Builder.BuilderDragger+DestinationPane pane, System.Int32 index) (at <b6a7b7d551684226bf5fd4838e9d1c24>:0)
Unity.UI.Builder.BuilderDragger.OnMouseUp (UnityEngine.UIElements.MouseUpEvent evt) (at <b6a7b7d551684226bf5fd4838e9d1c24>:0)
UnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <ea9e8ac7e3ff427f8b124b300d3b8a68>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <f2a59ed0ea0d4e54baa7d077aaf5393a>:0)
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