feat: allow hoppers, droppers and crafters to interact with Galacticraft machines

src/main/java/dev/galacticraft/machinelib/api/transfer/TransferType.java

@@ -28,7 +28,8 @@ public enum TransferType {
     INPUT(0x009001, true, false, true), // external: insertion only, players: insertion and extraction allowed
     OUTPUT(0xa7071e, false, true, false), // external: extraction only, players: extraction only
     STORAGE(0x008d90, true, true, true), // external: insertion and extraction allowed, players: insertion and extraction allowed
-    TRANSFER(0x908400, false, false, true); // external: immutable, players: insertion and extraction allowed - e.g. battery slots
+    TRANSFER(0x908400, false, false, true), // external: immutable, players: insertion and extraction allowed - e.g. battery slots
+    PROCESSING(0x908400, true, true, true); // external: insertion and extraction allowed, players: insertion and extraction allowed - e.g. bucket slots
 
     private final int color;
     private final boolean externalInsert;

src/main/java/dev/galacticraft/machinelib/client/api/screen/MachineScreen.java

@@ -369,7 +369,7 @@ protected void drawConfigurationPanels(@NotNull GuiGraphics graphics, int mouseX
      * @see #titleLabelY
      */
     protected void drawTitle(@NotNull GuiGraphics graphics) {
-        graphics.drawString(this.font, this.title, this.titleLabelX, this.titleLabelY, 0xFFFFFFFF, false);
+        graphics.drawString(this.font, this.title, this.titleLabelX, this.titleLabelY, 0xFF404040, false);
     }
 
     /**

src/main/java/dev/galacticraft/machinelib/impl/compat/transfer/ExposedSlotImpl.java

@@ -26,6 +26,7 @@
 import dev.galacticraft.machinelib.api.compat.transfer.ExposedSlot;
 import dev.galacticraft.machinelib.api.storage.slot.ResourceSlot;
 import dev.galacticraft.machinelib.api.transfer.ResourceFlow;
+import dev.galacticraft.machinelib.api.transfer.TransferType;
 import net.fabricmc.fabric.api.transfer.v1.storage.StorageView;
 import net.fabricmc.fabric.api.transfer.v1.storage.TransferVariant;
 import net.fabricmc.fabric.api.transfer.v1.transaction.TransactionContext;
@@ -57,7 +58,15 @@ public long insert(Variant variant, long maxAmount, TransactionContext transacti
 
     @Override
     public long extract(Variant variant, long maxAmount, TransactionContext transaction) {
-        return this.supportsExtraction() ? this.slot.extract(variant.getObject(), variant.getComponents(), maxAmount, transaction) : 0;
+        if (this.supportsExtraction()) {
+            if (this.slot.transferMode() == TransferType.PROCESSING) {
+                if (this.slot.getFilter().test(variant.getObject(), variant.getComponents())) {
+                    return 0;
+                }
+            }
+            return this.slot.extract(variant.getObject(), variant.getComponents(), maxAmount, transaction);
+        }
+        return 0;
     }
 
     @Override

src/testmod/java/dev/galacticraft/machinelib/testmod/block/entity/GeneratorBlockEntity.java

@@ -54,7 +54,7 @@ public class GeneratorBlockEntity extends MachineBlockEntity {
 
     public static final StorageSpec STORAGE_SPEC = StorageSpec.of(
             MachineItemStorage.spec(
-                    ItemResourceSlot.builder(TransferType.TRANSFER)
+                    ItemResourceSlot.builder(TransferType.PROCESSING)
                             .pos(8, 62)
                             .filter(ResourceFilters.CAN_INSERT_ENERGY)
                             .capacity(32),

src/testmod/java/dev/galacticraft/machinelib/testmod/block/entity/MelterBlockEntity.java

@@ -68,7 +68,7 @@ public class MelterBlockEntity extends MachineBlockEntity {
                     ItemResourceSlot.builder(TransferType.INPUT)
                             .pos(59, 42)
                             .filter(ResourceFilters.ofResource(Items.COBBLESTONE)),
-                    ItemResourceSlot.builder(TransferType.TRANSFER)
+                    ItemResourceSlot.builder(TransferType.PROCESSING)
                             .pos(152, 62)
                             .filter(ResourceFilters.canInsertFluid(Fluids.LAVA))
             ),

src/testmod/java/dev/galacticraft/machinelib/testmod/block/entity/MixerBlockEntity.java

@@ -66,10 +66,10 @@ public class MixerBlockEntity extends MachineBlockEntity {
                             .pos(8, 8)
                             .filter(ResourceFilters.CAN_EXTRACT_ENERGY)
                             .capacity(32),
-                    ItemResourceSlot.builder(TransferType.TRANSFER)
+                    ItemResourceSlot.builder(TransferType.PROCESSING)
                             .pos(48, 8)
                             .filter(ResourceFilters.canExtractFluid(Fluids.WATER)),
-                    ItemResourceSlot.builder(TransferType.TRANSFER)
+                    ItemResourceSlot.builder(TransferType.PROCESSING)
                             .pos(70, 8)
                             .filter(ResourceFilters.canExtractFluid(Fluids.LAVA)),
                     ItemResourceSlot.builder(TransferType.OUTPUT)