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src/main/java/thaumicenergistics/common/network/DistillationEncoderSetSourceC2SPacket.java

@@ -0,0 +1,45 @@
+package thaumicenergistics.common.network;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.world.item.ItemStack;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import thaumicenergistics.ThaumicEnergistics;
+import thaumicenergistics.common.container.ContainerDistillationPatternEncoder;
+
+/**
+ * 客户端→服务端 网络包：蒸馏编码台设置源物品（JEI 拖拽）。
+ * 源物品槽是真实 SlotItemHandler（非 ghost），拖拽需服务端权威写入 encoder 槽 0 + 刷新 aspects。
+ */
+public record DistillationEncoderSetSourceC2SPacket(
+        int containerId,
+        ItemStack stack
+) implements CustomPacketPayload {
+
+    public static final Type<DistillationEncoderSetSourceC2SPacket> TYPE =
+            new Type<>(ThaumicEnergistics.id("de_set_source"));
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, DistillationEncoderSetSourceC2SPacket> STREAM_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.VAR_INT, DistillationEncoderSetSourceC2SPacket::containerId,
+                    ItemStack.OPTIONAL_STREAM_CODEC, DistillationEncoderSetSourceC2SPacket::stack,
+                    DistillationEncoderSetSourceC2SPacket::new
+            );
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    /** 服务端处理：找到对应菜单，写入源物品槽并刷新 aspects。 */
+    public void handleOnServer(IPayloadContext ctx) {
+        ctx.enqueueWork(() -> {
+            if (ctx.player().containerMenu.containerId == this.containerId
+                    && ctx.player().containerMenu instanceof ContainerDistillationPatternEncoder menu) {
+                menu.setSourceItemOnServer(this.stack);
+            }
+        });
+    }
+}

src/main/java/thaumicenergistics/common/network/ThENetworking.java

@@ -29,6 +29,13 @@ public final class ThENetworking {
                 (pkt, ctx) -> pkt.handleOnServer(ctx)
         );
 
+        // DistillationEncoderSetSourceC2SPacket — C2S（蒸馏编码台设置源物品——JEI 拖拽）
+        registrar.playToServer(
+                DistillationEncoderSetSourceC2SPacket.TYPE,
+                DistillationEncoderSetSourceC2SPacket.STREAM_CODEC,
+                (pkt, ctx) -> pkt.handleOnServer(ctx)
+        );
+
         // CellWorkbenchC2SPacket — C2S（客户端→服务端，源质元件工作台分区操作）
         registrar.playToServer(
                 CellWorkbenchC2SPacket.TYPE,