#include "UI/DescentUiLayer.h"
#include "Core/Tuning/DescentTune_UI.h"

#include "Widgets/Layout/SDPIScaler.h"

void SDescentUiLayer::Construct(const FArguments& InArgs)
{
	SetVisibility(EVisibility::SelfHitTestInvisible);
	ChildSlot
	[
		SAssignNew(Scaler, SDPIScaler)
		.DPIScale(this, &SDescentUiLayer::GetChildScale)
		[
			InArgs._Content.Widget
		]
	];
}

void SDescentUiLayer::Tick(const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime)
{
	SCompoundWidget::Tick(AllottedGeometry, InCurrentTime, InDeltaTime);
	// Scale from this layer's local space to window pixels (the engine's DPI scaler is above us).
	const float Total = FMath::Max(0.01f, AllottedGeometry.GetAccumulatedLayoutTransform().GetScale());
	const FVector2f Px = AllottedGeometry.GetLocalSize() * Total;
	UiScale = Descent::Tune::UI::UiScaleForViewport(Px.X, Px.Y);
	ChildScale = UiScale / Total;
	LayoutSize = Px / UiScale;
}