When first added as a child widget in NamedSlot, the child widget can be dragged and dropped onto the parent widget's designer. The following assert causes a crash.
Assertion failed: ParentWidget != nullptr [File:/Engine/Source/Editor/UMGEditor/Private/Designer/SDesignerView.cpp] [Line: 2912]
After restarting the editor, NamedSlot's child widget will not be able to darg and drop, and no crash.
Result:
Crash editor.
Expected:
No crash editor, and Image widget (NamedSlot's child widget) can't be dragged and dropped.
> UE4Editor-UMGEditor.dll!SDesignerView::ProcessDropAndAddWidget(const FGeometry & MyGeometry, const FDragDropEvent & DragDropEvent, const bool bIsPreview) Line 2912 C++ UE4Editor-UMGEditor.dll!SDesignerView::OnDragOver(const FGeometry & MyGeometry, const FDragDropEvent & DragDropEvent) Line 2625 C++ UE4Editor-Slate.dll!FSlateApplication::RoutePointerMoveEvent::__l46::<lambda>(const FArrangedWidget & CurWidget, const FPointerEvent & Event) Line 4941 C++ UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,FReply <lambda>(const FArrangedWidget &, const FPointerEvent &) >(FSlateApplication * ThisApplication, FEventRouter::FBubblePolicy RoutingPolicy, FPointerEvent EventCopy, const FSlateApplication::RoutePointerMoveEvent::__l46::FReply <lambda>(const FArrangedWidget &, const FPointerEvent &) & Lambda) Line 372 C++ UE4Editor-Slate.dll!FSlateApplication::RoutePointerMoveEvent(const FWidgetPath & WidgetsUnderPointer, const FPointerEvent & PointerEvent, bool bIsSynthetic) Line 4987 C++ UE4Editor-Slate.dll!FSlateApplication::ProcessMouseMoveEvent(const FPointerEvent & MouseEvent, bool bIsSynthetic) Line 5370 C++ UE4Editor-Slate.dll!FSlateApplication::OnMouseMove() Line 5298 C++ UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage(const FDeferredWindowsMessage & DeferredMessage) Line 1996 C++ UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage(TSharedPtr<FWindowsWindow,0> & NativeWindow, HWND__ * InHWnd, unsigned int InMessage, unsigned __int64 InWParam, __int64 InLParam, int MouseX, int MouseY, unsigned int RawInputFlags) Line 2410 C++ UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage(HWND__ * hwnd, unsigned int msg, unsigned __int64 wParam, __int64 lParam) Line 1638 C++ UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc(HWND__ * hwnd, unsigned int msg, unsigned __int64 wParam, __int64 lParam) Line 789 C++ [External Code] [Inline Frame] UE4Editor-ApplicationCore.dll!WinPumpMessages() Line 108 C++ UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages(bool bFromMainLoop) Line 130 C++ UE4Editor.exe!FEngineLoop::Tick() Line 4397 C++ [Inline Frame] UE4Editor.exe!EngineTick() Line 62 C++ UE4Editor.exe!GuardedMain(const wchar_t * CmdLine, HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, int nCmdShow) Line 173 C++ UE4Editor.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow) Line 252 C++ [External Code]
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-92202 in the post.
| 1 |
| Component | UE - Editor - UI Systems |
|---|---|
| Affects Versions | 4.24 |
| Target Fix | 4.26, 5.0-early access |
| Fix Commit | 14207291 |
|---|
| Created | Apr 20, 2020 |
|---|---|
| Resolved | Aug 28, 2020 |
| Updated | Apr 28, 2021 |
| 7209 - projectgheist |