Block Relocation is a mod which adds 2 blocks: Platform and Relocator. Both can be found in the Transportation creative tab. They can be used together to move other blocks in the world. Platform is responsible for grabbing adjacent blocks, while Relocator is responsible for their movement. Relocator works when a direct redstone signal is received; it has a UI where you can set movement directions. Platform's sides can be toggled via an empty hand. Any entities above platforms will also be moved along.

Relocator recipe is a piston surrounded by obsidian, and Platform recipe is an iron ingot surrounded by sticks.

Relocator's block entity implements BlockMover interface, and Platform's block entity implements BlockGrabber interface.

While you can easily implement BlockGrabber interface on your block entity so it can be moved by a BlockMover, the side state toggling logic and rendering is up to you to design. You can use PlatformBlock and PlatformRenderer for reference.

When blocks are relocated, it is necessary to ensure that players are not interacting with those blocks via menu screens (UIs with items). This can be achieved by screens being closed when the game detects that there is no appropriate block in the old position anymore; detection should be done in AbstractContainerMenu.stillValid() method by checking whether a block entity in the old position is still the same.

If you are doing synchronization not via AbstractContainerMenu subclass, you must ensure that the block entity at the target position is of appropriate class.

This mod depends on Satako library.

To prepare a workspace with this mod, add following dependencies to the build file (change the version appropriately):

implementation(fg.deobf("dev.buildtool:satako:5.0.4-1.18.2"))

runtimeOnly(fg.deobf('dev.buildtool:block-relocation:0.0.4-1.18.2'))

implementation(fg.deobf('dev.buildtool:block-relocation:0.0.4-1.18.2:api'))