Code/net/minecraft/world/level/block/FenceBlock.java

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import java.util.function.Function;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.tags.BlockTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.LeadItem;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.ScheduledTickAccess;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.StateDefinition;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.material.Fluids;
import net.minecraft.world.level.pathfinder.PathComputationType;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.VoxelShape;

public class FenceBlock extends CrossCollisionBlock {
    public static final MapCodec<FenceBlock> CODEC = simpleCodec(FenceBlock::new);
    private final Function<BlockState, VoxelShape> occlusionShapes;

    @Override
    public MapCodec<FenceBlock> codec() {
        return CODEC;
    }

    public FenceBlock(BlockBehaviour.Properties p_53302_) {
        super(4.0F, 16.0F, 4.0F, 16.0F, 24.0F, p_53302_);
        this.registerDefaultState(
            this.stateDefinition
                .any()
                .setValue(NORTH, false)
                .setValue(EAST, false)
                .setValue(SOUTH, false)
                .setValue(WEST, false)
                .setValue(WATERLOGGED, false)
        );
        this.occlusionShapes = this.makeShapes(4.0F, 16.0F, 2.0F, 6.0F, 15.0F);
    }

    @Override
    protected VoxelShape getOcclusionShape(BlockState p_53338_) {
        return this.occlusionShapes.apply(p_53338_);
    }

    @Override
    protected VoxelShape getVisualShape(BlockState p_53311_, BlockGetter p_53312_, BlockPos p_53313_, CollisionContext p_53314_) {
        return this.getShape(p_53311_, p_53312_, p_53313_, p_53314_);
    }

    @Override
    protected boolean isPathfindable(BlockState p_53306_, PathComputationType p_53309_) {
        return false;
    }

    public boolean connectsTo(BlockState p_53330_, boolean p_53331_, Direction p_53332_) {
        Block block = p_53330_.getBlock();
        boolean flag = this.isSameFence(p_53330_);
        boolean flag1 = block instanceof FenceGateBlock && FenceGateBlock.connectsToDirection(p_53330_, p_53332_);
        return !isExceptionForConnection(p_53330_) && p_53331_ || flag || flag1;
    }

    private boolean isSameFence(BlockState p_153255_) {
        return p_153255_.is(BlockTags.FENCES) && p_153255_.is(BlockTags.WOODEN_FENCES) == this.defaultBlockState().is(BlockTags.WOODEN_FENCES);
    }

    @Override
    protected InteractionResult useWithoutItem(BlockState p_328142_, Level p_333097_, BlockPos p_335860_, Player p_334259_, BlockHitResult p_333666_) {
        return (InteractionResult)(!p_333097_.isClientSide() ? LeadItem.bindPlayerMobs(p_334259_, p_333097_, p_335860_) : InteractionResult.PASS);
    }

    @Override
    public BlockState getStateForPlacement(BlockPlaceContext p_53304_) {
        BlockGetter blockgetter = p_53304_.getLevel();
        BlockPos blockpos = p_53304_.getClickedPos();
        FluidState fluidstate = p_53304_.getLevel().getFluidState(p_53304_.getClickedPos());
        BlockPos blockpos1 = blockpos.north();
        BlockPos blockpos2 = blockpos.east();
        BlockPos blockpos3 = blockpos.south();
        BlockPos blockpos4 = blockpos.west();
        BlockState blockstate = blockgetter.getBlockState(blockpos1);
        BlockState blockstate1 = blockgetter.getBlockState(blockpos2);
        BlockState blockstate2 = blockgetter.getBlockState(blockpos3);
        BlockState blockstate3 = blockgetter.getBlockState(blockpos4);
        return super.getStateForPlacement(p_53304_)
            .setValue(NORTH, this.connectsTo(blockstate, blockstate.isFaceSturdy(blockgetter, blockpos1, Direction.SOUTH), Direction.SOUTH))
            .setValue(EAST, this.connectsTo(blockstate1, blockstate1.isFaceSturdy(blockgetter, blockpos2, Direction.WEST), Direction.WEST))
            .setValue(SOUTH, this.connectsTo(blockstate2, blockstate2.isFaceSturdy(blockgetter, blockpos3, Direction.NORTH), Direction.NORTH))
            .setValue(WEST, this.connectsTo(blockstate3, blockstate3.isFaceSturdy(blockgetter, blockpos4, Direction.EAST), Direction.EAST))
            .setValue(WATERLOGGED, fluidstate.getType() == Fluids.WATER);
    }

    @Override
    protected BlockState updateShape(
        BlockState p_53323_,
        LevelReader p_367370_,
        ScheduledTickAccess p_364464_,
        BlockPos p_53327_,
        Direction p_53324_,
        BlockPos p_53328_,
        BlockState p_53325_,
        RandomSource p_368641_
    ) {
        if (p_53323_.getValue(WATERLOGGED)) {
            p_364464_.scheduleTick(p_53327_, Fluids.WATER, Fluids.WATER.getTickDelay(p_367370_));
        }

        return p_53324_.getAxis().isHorizontal()
            ? p_53323_.setValue(
                PROPERTY_BY_DIRECTION.get(p_53324_), this.connectsTo(p_53325_, p_53325_.isFaceSturdy(p_367370_, p_53328_, p_53324_.getOpposite()), p_53324_.getOpposite())
            )
            : super.updateShape(p_53323_, p_367370_, p_364464_, p_53327_, p_53324_, p_53328_, p_53325_, p_368641_);
    }

    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> p_53334_) {
        p_53334_.add(NORTH, EAST, WEST, SOUTH, WATERLOGGED);
    }
}