Unit assembly system progress

core/src/mindustry/world/consumers/ConsumeItemDynamic.java

@@ -9,6 +9,7 @@ import mindustry.ui.*;
 public class ConsumeItemDynamic extends Consume{
     public final Func<Building, ItemStack[]> items;
 
+    @SuppressWarnings("unchecked")
     public <T extends Building> ConsumeItemDynamic(Func<T, ItemStack[]> items){
         this.items = (Func<Building, ItemStack[]>)items;
     }

core/src/mindustry/world/consumers/ConsumePayloadDynamic.java

@@ -0,0 +1,68 @@
+package mindustry.world.consumers;
+
+import arc.func.*;
+import arc.scene.ui.layout.*;
+import arc.struct.*;
+import mindustry.gen.*;
+import mindustry.type.*;
+import mindustry.ui.*;
+import mindustry.world.meta.*;
+
+public class ConsumePayloadDynamic extends Consume{
+    public final Func<Building, Seq<BlockStack>> payloads;
+
+    @SuppressWarnings("unchecked")
+    public <T extends Building>  ConsumePayloadDynamic(Func<T, Seq<BlockStack>> payloads){
+        this.payloads = (Func<Building, Seq<BlockStack>>)payloads;
+    }
+
+    @Override
+    public boolean valid(Building build){
+        return build.getBlockPayloads().contains(payloads.get(build));
+    }
+
+    @Override
+    public void trigger(Building build){
+        build.getBlockPayloads().remove(payloads.get(build));
+    }
+
+    @Override
+    public void display(Stats stats){
+        //needs to be implemented by the block itself, not enough info to display here
+    }
+
+    @Override
+    public void build(Building build, Table table){
+        Seq[] current = {payloads.get(build)};
+
+        table.table(cont -> {
+            table.update(() -> {
+                if(current[0] != payloads.get(build)){
+                    rebuild(build, cont);
+                    current[0] = payloads.get(build);
+                }
+            });
+
+            rebuild(build, cont);
+        });
+    }
+
+    private void rebuild(Building build, Table table){
+        var inv = build.getBlockPayloads();
+        var pay = payloads.get(build);
+
+        table.table(c -> {
+            int i = 0;
+            for(var stack : pay){
+                c.add(new ReqImage(new ItemImage(stack.block.uiIcon, stack.amount),
+                () -> inv.contains(stack.block, stack.amount))).padRight(8);
+                if(++i % 4 == 0) c.row();
+            }
+        }).left();
+    }
+
+    @Override
+    public ConsumeType type(){
+        return ConsumeType.payload;
+    }
+}