blockstacker works

src/main/java/de/jottyfan/minecraft/quickiefabric/blockentity/BlockStackerEntity.java

@@ -7,6 +7,7 @@ import net.minecraft.block.BlockState;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.block.entity.LootableContainerBlockEntity;
 import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 
@@ -36,16 +37,49 @@ public class BlockStackerEntity extends BlockEntity {
 		}
 	}
 
-	private static void transferOneStack(LootableContainerBlockEntity source, LootableContainerBlockEntity dest) {
+	private static final void transferOneStack(LootableContainerBlockEntity source, LootableContainerBlockEntity dest) {
-		Integer sourceCounter = findItemStackPos(source, false);
+		Integer sourceSlot = findItemStackPos(source, false);
-		Integer destCounter = findItemStackPos(dest, true);
+		if (sourceSlot != null && !Items.AIR.equals(source.getStack(sourceSlot).getItem())) {
-		// TODO: if stack.getItem().equals(source.getStack(sourceCounter).getItem() and stacksize < maxStackSize...
+			ItemStack sourceStack = source.getStack(sourceSlot);
-		if (sourceCounter != null && destCounter != null) {
+			Integer destSlot = findItemStackPos(dest, sourceStack);
-			dest.setStack(destCounter, source.removeStack(sourceCounter));
+			if (destSlot != null) {
+				Integer occupied = dest.getStack(destSlot).getCount();
+				Integer free = dest.getStack(destSlot).getMaxCount() - occupied;
+				Integer candidates = source.getStack(sourceSlot).getCount();
+				Integer travellers = candidates > free ? free : candidates;
+				if (travellers > 0) {
+					LOGGER.debug("transfer {}/{} of {} from slot {} to slot {} on top of {} ones", travellers, candidates, source.getStack(sourceSlot).getItem().toString(), sourceSlot, destSlot, occupied);
+					source.getStack(sourceSlot).decrement(travellers);
+					if (source.getStack(sourceSlot).getCount() < 1) {
+						source.removeStack(sourceSlot); // make empty slots really empty
+					}
+					dest.getStack(destSlot).increment(travellers);
+				}
+			} else {
+				Integer destFreeSlot = findItemStackPos(dest, true);
+				if (destFreeSlot != null) {
+					LOGGER.debug("transfer all of {} from slot {} to slot {}", source.getStack(sourceSlot).getItem().toString(), sourceSlot, destSlot);
+					dest.setStack(destFreeSlot, source.removeStack(sourceSlot));
+				}
+			}
 		}
 	}
 
-	private static Integer findItemStackPos(LootableContainerBlockEntity lcbe, Boolean empty) {
+	private static final Integer findItemStackPos(LootableContainerBlockEntity lcbe, ItemStack sourceStack) {
+		Integer counter = lcbe.size();
+		while (counter > 0) {
+			counter--;
+			ItemStack stack = lcbe.getStack(counter);
+			if (stack.getItem().equals(sourceStack.getItem())) {
+				if (stack.getCount() < stack.getMaxCount()) {
+					return counter;
+				}
+			}
+		}
+		return null;
+	}
+
+	private static final Integer findItemStackPos(LootableContainerBlockEntity lcbe, Boolean empty) {
 		Integer counter = lcbe.size();
 		while (counter > 0) {
 			counter--;

src/main/java/de/jottyfan/minecraft/quickiefabric/items/ItemCarrotstack.java

@@ -11,6 +11,6 @@ import net.minecraft.item.Item;
  */
 public class ItemCarrotstack extends Item {
 	public ItemCarrotstack() {
-		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(99).food(new FoodComponent.Builder().hunger(12).saturationModifier(0.6F).build()));
+		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(64).food(new FoodComponent.Builder().hunger(12).saturationModifier(0.6F).build()));
 	}
 }

src/main/java/de/jottyfan/minecraft/quickiefabric/items/ItemCotton.java

@@ -10,6 +10,6 @@ import net.minecraft.item.Item;
  */
 public class ItemCotton extends Item {
 	public ItemCotton() {
-		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(99));
+		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(64));
 	}
 }

src/main/java/de/jottyfan/minecraft/quickiefabric/items/ItemCottonseed.java

@@ -17,7 +17,7 @@ import net.minecraft.world.World;
  */
 public class ItemCottonseed extends Item {
 	public ItemCottonseed() {
-		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(99));
+		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(64));
 	}
 
 	@Override

src/main/java/de/jottyfan/minecraft/quickiefabric/items/ItemLevelup.java

@@ -10,6 +10,6 @@ import net.minecraft.item.Item;
  */
 public class ItemLevelup extends Item {
 	public ItemLevelup() {
-		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(99));
+		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(64));
 	}
 }

src/main/java/de/jottyfan/minecraft/quickiefabric/items/ItemRottenFleshStripes.java

@@ -10,6 +10,6 @@ import net.minecraft.item.Item;
  */
 public class ItemRottenFleshStripes extends Item {
 	public ItemRottenFleshStripes() {
-		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(99));
+		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(64));
 	}
 }

src/main/java/de/jottyfan/minecraft/quickiefabric/items/ItemStub.java

@@ -10,6 +10,6 @@ import net.minecraft.item.Item;
  */
 public class ItemStub extends Item {
 	public ItemStub() {
-		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(99));
+		super(new Item.Settings().group(RegistryManager.QUICKIEFABRIC_GROUP).maxCount(64));
 	}
 }

src/main/resources/assets/quickiefabric/models/block/blockstacker.json

@@ -1,6 +1,8 @@
 {
-		"parent": "block/cube_all",
+	"parent": "block/cube_bottom_top",
 	"textures": {
-				"all": "quickiefabric:block/blockstacker"
+		"bottom": "quickiefabric:block/blockstackerbottom",
+		"side": "quickiefabric:block/blockstacker",
+		"top": "quickiefabric:block/blockstackertop"
 	}
 }