void SWidget::SlatePrepass(float LayoutScaleMultiplier)
{
//SLATE_CYCLE_COUNTER_SCOPE_CUSTOM_DETAILED(SLATE_STATS_DETAIL_LEVEL_MED, GSlatePrepass, GetType());
// TODO Figure out a better way than to just reset the pointer. This causes problems when we prepass
// volatile widgets, who still need to know about their invalidation panel incase they vanish themselves.
// Reset the layout cache object each pre-pass to ensure we never access a stale layout cache object
// as this widget could have been moved in and out of a panel that was invalidated between frames.
//LayoutCache = nullptr;
if ( bCanHaveChildren )
{
// Cache child desired sizes first. This widget's desired size is
// a function of its children's sizes.
FChildren* MyChildren = this->GetChildren();
int32 NumChildren = MyChildren->Num();
for ( int32 ChildIndex=0; ChildIndex < NumChildren; ++ChildIndex )
{
const TSharedRef<SWidget>& Child = MyChildren->GetChildAt(ChildIndex);
if ( Child->Visibility.Get() != EVisibility::Collapsed )
{
const float ChildLayoutScaleMultiplier = GetRelativeLayoutScale(MyChildren->GetSlotAt(ChildIndex));
// Recur: Descend down the widget tree.
Child->SlatePrepass(LayoutScaleMultiplier*ChildLayoutScaleMultiplier);
}
}
}
// Cache this widget's desired size.
CacheDesiredSize(LayoutScaleMultiplier);
}
