blockstate, more block events, command preprocess event.

Minecraft.Server.FourKit/Event/Block/BlockPistonExtendEvent.cs

@@ -0,0 +1,46 @@
+namespace Minecraft.Server.FourKit.Event.Block;
+
+using Minecraft.Server.FourKit.Block;
+
+/// <summary>
+/// Called when a piston extends.
+/// </summary>
+public class BlockPistonExtendEvent : BlockPistonEvent
+{
+    private readonly int _length;
+
+    internal BlockPistonExtendEvent(Block block, int length, BlockFace direction)
+        : base(block, direction)
+    {
+        _length = length;
+    }
+
+    /// <summary>
+    /// Get the amount of blocks which will be moved while extending.
+    /// </summary>
+    /// <returns>The amount of moving blocks.</returns>
+    public int getLength() => _length;
+
+    /// <summary>
+    /// Get an immutable list of the blocks which will be moved by the extending.
+    /// </summary>
+    /// <returns>Immutable list of the moved blocks.</returns>
+    public List<Block> getBlocks()
+    {
+        var blocks = new List<Block>();
+        var world = getBlock().getWorld();
+        int x = getBlock().getX();
+        int y = getBlock().getY();
+        int z = getBlock().getZ();
+        var dir = getDirection();
+
+        for (int i = 0; i < _length; i++)
+        {
+            x += dir.getModX();
+            y += dir.getModY();
+            z += dir.getModZ();
+            blocks.Add(new Block(world, x, y, z));
+        }
+        return blocks.AsReadOnly().ToList();
+    }
+}