ultimate-bar-system-plugin/Source/UniversalBars/Private/UniversalHUDWidget.cpp

// Copyright IHY. Universal Bars plugin.
#include "UniversalHUDWidget.h"
#include "UniversalBarWidget.h"
#include "UniversalBarsSubsystem.h"
#include "UniversalBarsTheme.h"
#include "Components/Image.h"
#include "Components/PanelWidget.h"
#include "Components/CanvasPanel.h"
#include "Components/CanvasPanelSlot.h"

void UUniversalHUDWidget::NativeConstruct()
{
	Super::NativeConstruct();
	ApplyTheme();
	if (UUniversalBarsSubsystem* Sub = UUniversalBarsSubsystem::Get(this))
	{
		Sub->RegisterHUD(this);
	}
}

void UUniversalHUDWidget::ApplyTheme()
{
	if (!Theme)
	{
		return;
	}

	HungerColor = Theme->Hunger;
	WeightColor = Theme->Weight;
	ColdColor   = Theme->Cold;

	auto StyleBar = [this](UUniversalBarWidget* Bar, FLinearColor Fill)
	{
		if (!Bar)
		{
			return;
		}
		Bar->SetBarColors(Fill, Theme->Empty, Theme->Border, Theme->Delayed);
		Bar->SetVector(TEXT("ShieldColor"), Theme->Shield);
		Bar->DamageFlashColor = Theme->DamageFlash;
		Bar->HealFlashColor = Theme->HealFlash;
		Bar->SetScalar(TEXT("CornerRadius"), Theme->CornerRadius);
		Bar->SetScalar(TEXT("BorderSize"), Theme->BorderSize);
		Bar->SetScalar(TEXT("InnerPadding"), Theme->InnerPadding);
	};
	StyleBar(HealthBar, Theme->HealthFill);
	StyleBar(StaminaBar, Theme->StaminaFill);

	if (ChipsPanel && Theme->ChipColors.Num() > 0)
	{
		const int32 N = ChipsPanel->GetChildrenCount();
		for (int32 i = 0; i < N; ++i)
		{
			if (UImage* Img = Cast<UImage>(ChipsPanel->GetChildAt(i)))
			{
				Img->SetBrushTintColor(FSlateColor(Theme->ChipColors[i % Theme->ChipColors.Num()]));
			}
		}
	}

	// Tracking chips: tint by what they represent.
	if (ChipHeart)  { ChipHeart->SetBrushTintColor(FSlateColor(Theme->HealthFill)); }
	if (ChipHunger) { ChipHunger->SetBrushTintColor(FSlateColor(Theme->Hunger)); }
	if (ChipWeight) { ChipWeight->SetBrushTintColor(FSlateColor(Theme->Weight)); }
	if (ChipCold)   { ChipCold->SetBrushTintColor(FSlateColor(Theme->Cold)); }
}

void UUniversalHUDWidget::NativeDestruct()
{
	if (UUniversalBarsSubsystem* Sub = UUniversalBarsSubsystem::Get(this))
	{
		Sub->UnregisterHUD(this);
	}
	Super::NativeDestruct();
}

void UUniversalHUDWidget::SetHealth(float Percent)
{
	if (HealthBar) { HealthBar->SetFillPercent(Percent, true); }
}

void UUniversalHUDWidget::SetStamina(float Percent)
{
	if (StaminaBar) { StaminaBar->SetFillPercent(Percent, true); }
}

void UUniversalHUDWidget::SetShield(float Percent)
{
	if (HealthBar) { HealthBar->SetShieldPercent(Percent); }
}

void UUniversalHUDWidget::SetHunger(float Amount)
{
	if (HealthBar) { HealthBar->SetPenaltyZone(TEXT("Hunger"), Amount, HungerColor); }
}

void UUniversalHUDWidget::SetWeight(float Amount)
{
	if (HealthBar) { HealthBar->SetPenaltyZone(TEXT("Weight"), Amount, WeightColor); }
}

void UUniversalHUDWidget::SetCold(float Amount)
{
	if (HealthBar) { HealthBar->SetPenaltyZone(TEXT("Cold"), Amount, ColdColor); }
}

void UUniversalHUDWidget::DamageHealth(float Delta)
{
	if (HealthBar) { HealthBar->SetFillPercent(HealthBar->GetFillPercent() - FMath::Abs(Delta), true); }
}

void UUniversalHUDWidget::HealHealth(float Delta)
{
	if (HealthBar) { HealthBar->SetFillPercent(HealthBar->GetFillPercent() + FMath::Abs(Delta), true); }
}

float UUniversalHUDWidget::GetHealth() const
{
	return HealthBar ? HealthBar->GetFillPercent() : 0.f;
}

void UUniversalHUDWidget::SetDemoMode(bool bEnable)
{
	bDemoMode = bEnable;
	bDemoInit = false;
	DemoTimer = 0.f;
	DemoStep = 0;
}

void UUniversalHUDWidget::DemoStepNow()
{
	// Each step shows a different animation; between steps the bars ease on their own.
	switch (DemoStep % 10)
	{
		case 0: DamageHealth(0.25f);  break;          // red flash + lag tail
		case 1: SetStamina(0.30f);    break;          // stamina drop
		case 2: HealHealth(0.20f);    break;          // green flash + smooth rise
		case 3: SetHunger(0.18f);     break;          // hunger zone grows in
		case 4: SetWeight(0.14f);     break;          // weight zone grows in
		case 5: SetStamina(0.95f);    break;          // stamina refill
		case 6: HealHealth(0.30f);    break;
		case 7: SetHunger(0.0f);      break;          // hunger zone retracts
		case 8: SetWeight(0.0f);      break;          // weight zone retracts
		case 9: DamageHealth(0.45f);  break;          // big hit -> low-HP pulse
	}
	++DemoStep;
}

void UUniversalHUDWidget::PositionChips()
{
	if (!HealthBar)
	{
		return;
	}
	// Width of the bar in local pixels — ChipCanvas is overlaid on HealthBar so
	// the same width maps zone-U (0..1) straight to chip X.
	const float W = HealthBar->GetCachedGeometry().GetLocalSize().X;
	if (W <= 1.f)
	{
		return; // not laid out yet this frame
	}

	auto Place = [W](UImage* Chip, float U)
	{
		if (!Chip)
		{
			return;
		}
		if (U < 0.f)
		{
			Chip->SetVisibility(ESlateVisibility::Collapsed); // zone absent
			return;
		}
		Chip->SetVisibility(ESlateVisibility::HitTestInvisible);
		if (UCanvasPanelSlot* CSlot = Cast<UCanvasPanelSlot>(Chip->Slot))
		{
			const float ChipW = CSlot->GetSize().X;
			// centre over the zone, sitting just above the bar (negative Y)
			CSlot->SetPosition(FVector2D(U * W - ChipW * 0.5f, -ChipW - 6.f));
		}
	};

	Place(ChipHeart,  HealthBar->GetUsableEnd());
	Place(ChipHunger, HealthBar->GetZoneCenter(TEXT("Hunger")));
	Place(ChipWeight, HealthBar->GetZoneCenter(TEXT("Weight")));
	Place(ChipCold,   HealthBar->GetZoneCenter(TEXT("Cold")));
}

void UUniversalHUDWidget::NativeTick(const FGeometry& MyGeometry, float InDeltaTime)
{
	Super::NativeTick(MyGeometry, InDeltaTime);

	PositionChips(); // always track the bar, demo or not

	if (!bDemoMode)
	{
		return;
	}

	if (!bDemoInit)
	{
		bDemoInit = true;
		SetHealth(1.f);
		SetStamina(1.f);
		SetHunger(0.f);
		SetWeight(0.f);
		DemoTimer = 0.f;
		DemoStep = 0;
	}

	DemoTimer += InDeltaTime;
	if (DemoTimer >= DemoStepInterval)
	{
		DemoTimer = 0.f;
		DemoStepNow();
	}
}