InventorySlotSyncPacket.java

package slimeknights.tconstruct.tools.common.network;

import net.minecraft.client.Minecraft;
import net.minecraft.client.network.NetHandlerPlayClient;
import net.minecraft.item.ItemStack;
import net.minecraft.network.NetHandlerPlayServer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.math.BlockPos;
import net.minecraftforge.fml.common.network.ByteBufUtils;

import io.netty.buffer.ByteBuf;
import slimeknights.mantle.network.AbstractPacketThreadsafe;
import slimeknights.mantle.tileentity.TileInventory;

public class InventorySlotSyncPacket extends AbstractPacketThreadsafe {

  public ItemStack itemStack;
  public int slot;
  public BlockPos pos;

  public InventorySlotSyncPacket() {
  }

  public InventorySlotSyncPacket(ItemStack itemStack, int slot, BlockPos pos) {
    this.itemStack = itemStack;
    this.pos = pos;
    this.slot = slot;
  }

  @Override
  public void handleClientSafe(NetHandlerPlayClient netHandler) {
    // only ever sent to players in the same dimension as the position
    TileEntity tileEntity = Minecraft.getMinecraft().player.getEntityWorld().getTileEntity(pos);
    if(tileEntity == null || !(tileEntity instanceof TileInventory)) {
      return;
    }

    TileInventory tile = (TileInventory) tileEntity;
    tile.setInventorySlotContents(slot, itemStack);
    Minecraft.getMinecraft().renderGlobal.notifyBlockUpdate(null, pos, null, null, 0);
  }

  @Override
  public void handleServerSafe(NetHandlerPlayServer netHandler) {
    // only send to clients
    throw new UnsupportedOperationException("Clientside only");
  }

  @Override
  public void fromBytes(ByteBuf buf) {
    this.pos = readPos(buf);
    this.slot = buf.readShort();
    this.itemStack = ByteBufUtils.readItemStack(buf);
  }

  @Override
  public void toBytes(ByteBuf buf) {
    writePos(pos, buf);
    buf.writeShort(slot);
    ByteBufUtils.writeItemStack(buf, itemStack);
  }
}