Draw block highlight for specific multipart hit

src/main/java/net/shadowfacts/simplemultipart/mixin/client/MixinWorldRenderer.java

@@ -0,0 +1,36 @@
+package net.shadowfacts.simplemultipart.mixin.client;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.WorldRenderer;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.world.BlockView;
+import net.shadowfacts.simplemultipart.SimpleMultipart;
+import net.shadowfacts.simplemultipart.container.MultipartContainer;
+import net.shadowfacts.simplemultipart.util.MultipartHelper;
+import net.shadowfacts.simplemultipart.util.MultipartHitResult;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+/**
+ * @author shadowfacts
+ */
+@Mixin(WorldRenderer.class)
+public class MixinWorldRenderer {
+
+	@Redirect(method = "drawHighlightedBlockOutline", at = @At(value = "INVOKE", target = "getBoundingShape"))
+	public VoxelShape getHighlightShape(BlockState state, BlockView world, BlockPos pos) {
+		if (state.getBlock() == SimpleMultipart.containerBlock || state.getBlock() == SimpleMultipart.tickableContainerBlock) {
+			MultipartContainer container = (MultipartContainer)world.getBlockEntity(pos);
+			MultipartHitResult result = MultipartHelper.rayTrace(container, world, pos, MinecraftClient.getInstance().player);
+			if (result != null && result.view != null) {
+				return result.view.getState().getBoundingShape(result.view);
+			}
+		}
+
+		return state.getBoundingShape(world, pos);
+	}
+
+}

src/main/java/net/shadowfacts/simplemultipart/util/MultipartHelper.java

@@ -12,6 +12,7 @@ import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.Vec3d;
 import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
 import net.shadowfacts.simplemultipart.SimpleMultipart;
 import net.shadowfacts.simplemultipart.container.MultipartContainer;
@@ -37,7 +38,7 @@ public class MultipartHelper {
 	 * @param player The player performing the ray trace.
 	 * @return A hit result for the hit multipart. {@ode null} if not part was hit.
 	 */
-	public static MultipartHitResult rayTrace(MultipartContainer container, World world, BlockPos pos, PlayerEntity player) {
+	public static MultipartHitResult rayTrace(MultipartContainer container, BlockView world, BlockPos pos, PlayerEntity player) {
 		// copied from BoatItem::use
 		float var6 = MathHelper.lerp(1.0F, player.prevPitch, player.pitch);
 		float var7 = MathHelper.lerp(1.0F, player.prevYaw, player.yaw);
@@ -67,7 +68,7 @@ public class MultipartHelper {
 	 * @param end The end position for the ray.
 	 * @return A hit result for the hit multipart. {@code null} if no part was hit.
 	 */
-	public static MultipartHitResult rayTrace(MultipartContainer container, World world, BlockPos pos, Vec3d start, Vec3d end) {
+	public static MultipartHitResult rayTrace(MultipartContainer container, BlockView world, BlockPos pos, Vec3d start, Vec3d end) {
 		return container.getParts().stream()
 				.map(view -> {
 					VoxelShape shape = view.getState().getBoundingShape(view);

src/main/resources/simplemultipart.client.json

@@ -5,7 +5,8 @@
   "mixins": [
     "MixinBlockRenderManager",
     "MixinDebugHud",
-    "MixinModelLoader"
+    "MixinModelLoader",
+    "MixinWorldRenderer"
   ],
   "injectors": {
     "defaultRequire": 1