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src/main/java/vazkii/quark/content/experimental/client/tooltip/VariantsComponent.java

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+package vazkii.quark.content.experimental.client.tooltip;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import com.mojang.blaze3d.vertex.PoseStack;
+
+import net.minecraft.client.gui.Font;
+import net.minecraft.client.gui.screens.inventory.tooltip.ClientTooltipComponent;
+import net.minecraft.client.renderer.entity.ItemRenderer;
+import net.minecraft.world.inventory.tooltip.TooltipComponent;
+import net.minecraft.world.item.BlockItem;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.Block;
+import net.minecraftforge.api.distmarker.Dist;
+import net.minecraftforge.api.distmarker.OnlyIn;
+import vazkii.quark.content.experimental.module.VariantSelectorModule;
+
+@OnlyIn(Dist.CLIENT)
+public class VariantsComponent implements ClientTooltipComponent, TooltipComponent {
+
+	final ItemStack stack;
+
+	boolean computed = false;
+	List<ItemStack> variants;
+	int height, width;
+
+	public VariantsComponent(ItemStack stack) {
+		this.stack = stack;
+	}
+
+	private List<ItemStack> getVariants() {
+		if(computed)
+			return variants;
+
+
+		List<ItemStack> setVariants = new ArrayList<>();
+		Item item = stack.getItem();
+		if(item instanceof BlockItem bi) {
+			Block block = bi.getBlock();
+
+			Collection<Block> allVariants = VariantSelectorModule.variants.getAllVariants(block);
+			for(Block b : allVariants)
+				setVariants.add(new ItemStack(b));
+		}
+
+		computed = true;
+		variants = setVariants;
+
+		int size = variants.size();
+		height = (size == 0 ? 0 : 20);
+		width = size * 18;
+
+		return variants;
+	}
+
+	@Override
+	public void renderImage(Font font, int x, int y, PoseStack stack, ItemRenderer render, int yea) {
+		List<ItemStack> variants = getVariants();
+
+		for(int i = 0; i < variants.size(); i++) {
+			ItemStack variant = variants.get(i);
+			render.renderGuiItem(variant, x + i * 18, y);
+		}
+	}
+
+	@Override
+	public int getHeight() {
+		getVariants();
+		return height;
+	}
+
+	@Override
+	public int getWidth(Font font) {
+		getVariants();
+		return width;
+	}
+
+}