Unreal Engine Issues

UE-211575

IME does not work in EditableTextBox in WidgetComponent

IME does not work in EditableTextBox in WidgetComponent

Description

WidgetComponent controls widgets through VirtualWindow, but VirtualWindow does not have HWND, so IME cannot be enabled.
The following workaround enables IME activation.

 

void FSlateEditableTextLayout::FTextInputMethodContext::CacheWindow()
{
	if (!OwnerLayout)
	{
		return;
	}

	const TSharedRef<const SWidget> OwningSlateWidgetPtr = OwnerLayout->OwnerWidget->GetSlateWidget();
#if 0
	CachedParentWindow = FSlateApplication::Get().FindWidgetWindow(OwningSlateWidgetPtr);
#else  //workaround
	TSharedPtr<SWindow> SlateWindow = FSlateApplication::Get().FindWidgetWindow(OwningSlateWidgetPtr);
	if (SlateWindow->IsVirtualWindow())
	{
		SlateWindow = FSlateApplication::Get().GetActiveTopLevelRegularWindow();
	}
	CachedParentWindow = SlateWindow;
#endif
}

 

 

Steps to Reproduce
  1. Open attached repro project [Link Removed]
  2. Start PIE
  3. Pick up a gun in the level
  4. Turn right and point "Focus textbox below" button and left click
  5. Type some key to input 
  6. Try to enable IME by keyboard shortcut (maybe shift+caps for English keyboard)
  7. Try to input some regional character

Result:

IME cannot be enabled

 

 

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Backlogged
ComponentUE - Editor - UI Systems
Affects Versions5.2, 5.3
CreatedApr 5, 2024
UpdatedOct 10, 2024
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