UE小：UE5的Pixelstreaming在捕获画面的时候没办法显示非Viewport的Slate区域按钮的ToolTip

devtools/2024/10/19 0:12:56/

原始代码

首先，让我们看看原始代码片段：

// Some widgets might want to provide an alternative Tooltip Handler.
if (bCanSpawnNewTooltip || !NewTooltip)
{TSharedPtr<SWidget> NewTooltipWidget = NewTooltip ? NewTooltip->AsWidget() : TSharedPtr<SWidget>();for (int32 WidgetIndex = WidgetsToQueryForTooltip.Widgets.Num() - 1; WidgetIndex >= 0; --WidgetIndex){const TSharedRef<SWidget>& CurWidget = WidgetsToQueryForTooltip.Widgets[WidgetIndex].Widget;if (CurWidget->OnVisualizeTooltip(NewTooltipWidget)){// Someone is taking care of visualizing this tooltipNewTooltipVisualizer = CurWidget;break;}}
}

修改后的代码

现在，我们来看一下修改后的版本：

// Some widgets might want to provide an alternative Tooltip Handler.
if (bCanSpawnNewTooltip || !NewTooltip)
{TSharedPtr<SWidget> NewTooltipWidget = NewTooltip ? NewTooltip->AsWidget() : TSharedPtr<SWidget>();
#if (UE_BUILD_SHIPPING || UE_BUILD_DEBUG)FVector2D WindowInitialDesiredSize =  SlateApp.GetTopLevelWindows()[0]->GetInitialDesiredSizeInScreen();FVector2D  ViewportSize = SlateApp.GetTopLevelWindows()[0]->GetViewport()->GetSize();FWidgetPath WidgetsUnderCursor = SlateApp.LocateWindowUnderMouse(FVector2D (ViewportSize.X-170,63), SlateApp.GetInteractiveTopLevelWindows(), /*bIgnoreEnabledStatus =*/true, UserIndex);for (int32 WidgetIndex = WidgetsUnderCursor.Widgets.Num() - 1; WidgetIndex >= 0; --WidgetIndex){const TSharedRef<SWidget>& CurWidget = WidgetsUnderCursor.Widgets[WidgetIndex].Widget;if (CurWidget->OnVisualizeTooltip(NewTooltipWidget)){// Someone is taking care of visualizing this tooltipNewTooltipVisualizer = CurWidget;break;}}
#elsefor (int32 WidgetIndex = WidgetsToQueryForTooltip.Widgets.Num() - 1; WidgetIndex >= 0; --WidgetIndex){const TSharedRef<SWidget>& CurWidget = WidgetsToQueryForTooltip.Widgets[WidgetIndex].Widget;if (CurWidget->OnVisualizeTooltip(NewTooltipWidget)){// Someone is taking care of visualizing this tooltipNewTooltipVisualizer = CurWidget;break;}}
#endif
}

主要原因

主要看当前的要显示ToolTip的区域是否有一个SVirtualWindow，如果有就将ToolTip显示在SVirtualWindow之内就行，否则的话NewTooltipVisualizer将不会赋值，导致的后果就是他会新生成一个SWindow，独立于Pixelstreaming的TargetWindow，而Pixelstreaming只捕获TargetWindow画面，所以导致看到的画面中没有ToolTip并且伴随着闪烁，如果显卡能力稍弱一点可能会导致崩溃