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BlueRose
2025-09-03 13:52:28 +08:00
parent 914c9548f9
commit b00503fdc6
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88
03-UnrealEngine/UI/CommonUI.md
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@@ -251,3 +251,91 @@ PS:
## 函数？ ## 函数？
KeyBoardFocus KeyBoardFocus
```c++
void UWidget::SetKeyboardFocus()
{
TSharedPtr<SWidget> SafeWidget = GetCachedWidget();
if (SafeWidget.IsValid())
{
#if !(UE_BUILD_SHIPPING || UE_BUILD_TEST)
if ( !SafeWidget->SupportsKeyboardFocus() )
{
FMessageLog("PIE").Warning(FText::Format(LOCTEXT("ThisWidgetDoesntSupportFocus", "The widget {0} does not support focus. If this is a UserWidget, you should set bIsFocusable to true."), FText::FromString(GetNameSafe(this))));
}
#endif
if ( !FSlateApplication::Get().SetKeyboardFocus(SafeWidget) )
{
if ( UWorld* World = GetWorld() )
{
if ( ULocalPlayer* LocalPlayer = World->GetFirstLocalPlayerFromController() )
{
LocalPlayer->GetSlateOperations().SetUserFocus(SafeWidget.ToSharedRef(), EFocusCause::SetDirectly);
}
}
}
}
}
void UWidget::SetFocus()
{
SetUserFocus(GetOwningPlayer());
}
void UWidget::SetUserFocus(APlayerController* PlayerController)
{
if ( PlayerController == nullptr || !PlayerController->IsLocalPlayerController() || PlayerController->Player == nullptr )
{
#if !(UE_BUILD_SHIPPING || UE_BUILD_TEST)
FMessageLog("PIE").Error()->AddToken(FTextToken::Create(LOCTEXT("NoPlayerControllerToFocus", "The PlayerController is not a valid local player so it can't focus on ")))->AddToken(FUObjectToken::Create(this));
#endif
return;
}
TSharedPtr<SWidget> SafeWidget = GetCachedWidget();
if ( SafeWidget.IsValid() )
{
#if !(UE_BUILD_SHIPPING || UE_BUILD_TEST)
if ( !SafeWidget->SupportsKeyboardFocus() )
{
TSharedRef<FTokenizedMessage> Message = FMessageLog("PIE").Warning()->AddToken(FUObjectToken::Create(this));
#if WITH_EDITORONLY_DATA
if(UObject* GeneratedBy = WidgetGeneratedBy.Get())
{
Message->AddToken(FTextToken::Create(FText::FromString(TEXT(" in "))))->AddToken(FUObjectToken::Create(GeneratedBy));
}
#endif
if (IsA(UUserWidget::StaticClass()))
{
Message->AddToken(FTextToken::Create(LOCTEXT("UserWidgetDoesntSupportFocus", " does not support focus, you should set bIsFocusable to true.")));
}
else
{
Message->AddToken(FTextToken::Create(LOCTEXT("NonUserWidgetDoesntSupportFocus", " does not support focus.")));
}
}
#endif
if ( ULocalPlayer* LocalPlayer = PlayerController->GetLocalPlayer() )
{
TOptional<int32> UserIndex = FSlateApplication::Get().GetUserIndexForController(LocalPlayer->GetControllerId());
if (UserIndex.IsSet())
{
FReply& DelayedSlateOperations = LocalPlayer->GetSlateOperations();
if (FSlateApplication::Get().SetUserFocus(UserIndex.GetValue(), SafeWidget))
{
DelayedSlateOperations.CancelFocusRequest();
}
else
{
DelayedSlateOperations.SetUserFocus(SafeWidget.ToSharedRef());
}
}
}
}
}
```