Some UI testing and basic item implementation

src/main/java/com/fureniku/metropolis/RegistrationBase.java

@@ -1,9 +1,13 @@
 package com.fureniku.metropolis;
 
 import com.fureniku.metropolis.blockentity.MetroBlockEntity;
+import com.fureniku.metropolis.client.screens.UIRenderHandler;
 import com.fureniku.metropolis.menus.MetroMenu;
 import com.fureniku.metropolis.utils.CreativeTabSet;
 import com.fureniku.metropolis.utils.Debug;
+import com.mojang.blaze3d.systems.RenderSystem;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.GameRenderer;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.data.DataGenerator;
 import net.minecraft.data.PackOutput;
@@ -12,13 +16,17 @@
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraftforge.client.event.ModelEvent;
+import net.minecraftforge.client.event.RegisterGuiOverlaysEvent;
+import net.minecraftforge.client.gui.overlay.IGuiOverlay;
+import net.minecraftforge.client.gui.overlay.VanillaGuiOverlay;
 import net.minecraftforge.common.data.ExistingFileHelper;
 import net.minecraftforge.data.event.GatherDataEvent;
 import net.minecraftforge.event.BuildCreativeModeTabContentsEvent;
 import net.minecraftforge.eventbus.api.IEventBus;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
 import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
+import net.minecraftforge.fml.loading.FMLEnvironment;
 import net.minecraftforge.registries.DeferredRegister;
 import net.minecraftforge.registries.ForgeRegistries;
 import net.minecraftforge.registries.RegistryObject;
@@ -64,9 +72,13 @@ public RegistrationBase(String modid, IEventBus modEventBus) {
         modEventBus.addListener(this::client);
         modEventBus.addListener(this::buildCreativeTabs);
         //These need to be client only. Unused for now so disabled //todo
-        //modEventBus.addListener(this::modelInit);
-        //modEventBus.addListener(this::modelBakeComplete);
-        //modEventBus.addListener(this::modifyBake);
+        if (FMLEnvironment.dist.isClient()) {
+            //modEventBus.addListener(this::modelInit);
+            //modEventBus.addListener(this::modelBakeComplete);
+            //modEventBus.addListener(this::modifyBake);
+            modEventBus.addListener(this::guiOverlay);
+        }
+
         modEventBus.addListener(this::generate);
         blockRegistry.register(modEventBus);
         itemRegistry.register(modEventBus);
@@ -153,6 +165,16 @@ public RegistryObject<Block> retrieveRegisterBlockSet(String name, Supplier<Bloc
         return block;
     }
 
+    public String registerItem(String name, Supplier<Item> itemClass) {
+        retrieveRegisterItem(name, itemClass);
+        return name;
+    }
+
+    public RegistryObject<Item> retrieveRegisterItem(String name, Supplier<Item> itemClass) {
+        RegistryObject<Item> item = itemRegistry.register(name, itemClass);
+        return item;
+    }
+
     public <T extends MetroBlockEntity> RegistryObject<BlockEntityType<T>> registerBlockEntity(String name, BlockEntityType.BlockEntitySupplier<T> blockEntity, Block... validBlocks) {
         return blockEntityRegistry.register(name, () -> BlockEntityType.Builder.of(blockEntity, validBlocks).build(null));
     }
@@ -303,6 +325,12 @@ protected void modelBakeComplete(ModelEvent.BakingCompleted event) {
         bakingComplete(event);
     }*/
 
+    @SubscribeEvent
+    protected void guiOverlay(RegisterGuiOverlaysEvent event) {
+        event.registerAboveAll("test_ui_class", UIRenderHandler::new);
+    }
+
+
     //Add a block to the registry
     private void addBlock(String key, RegistryObject<Block> value) {
         block_map.put(key, value);

src/main/java/com/fureniku/metropolis/client/screens/UIRenderHandler.java

@@ -0,0 +1,32 @@
+package com.fureniku.metropolis.client.screens;
+
+import com.fureniku.metropolis.utils.Debug;
+import com.mojang.blaze3d.systems.RenderSystem;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.client.renderer.GameRenderer;
+import net.minecraftforge.client.gui.overlay.ForgeGui;
+import net.minecraftforge.client.gui.overlay.IGuiOverlay;
+
+public class UIRenderHandler implements IGuiOverlay {
+
+    public UIRenderHandler(ForgeGui forgeGui, GuiGraphics guiGraphics, float v, int i, int i1) {
+        render(forgeGui, guiGraphics, v, i, i1);
+    }
+
+    @Override
+    public void render(ForgeGui gui, GuiGraphics guiGraphics, float partialTick, int screenWidth, int screenHeight) {
+        RenderSystem.setShader(GameRenderer::getPositionColorShader);
+
+        // Maybe this draw a rectangle on the screen.
+        // First, second, third and fourth arguments may set a position.
+        // Fifth argument may set color.
+        guiGraphics.fill(100, 120, 140, 160, 0xFFFFFF);
+
+        // This draw text on the screen. The method have no problem.
+        // Third and fourth arguments set a position.
+        // Fifth argument sets text color.
+        // Sixth argument sets shadow.
+        guiGraphics.drawString(Minecraft.getInstance().font, "test", 100, 140, 0xFFFFFF, true);
+    }
+}

src/main/java/com/fureniku/metropolis/items/MetroItemBase.java

@@ -0,0 +1,10 @@
+package com.fureniku.metropolis.items;
+
+import net.minecraft.world.item.Item;
+
+public class MetroItemBase extends Item {
+
+    public MetroItemBase(Properties props) {
+        super(props);
+    }
+}

src/main/java/com/fureniku/metropolis/items/MetroItemSimple.java

@@ -0,0 +1,12 @@
+package com.fureniku.metropolis.items;
+
+public class MetroItemSimple extends MetroItemBase {
+
+    public MetroItemSimple() {
+        this(64);
+    }
+
+    public MetroItemSimple(int stackSize) {
+        super(new Properties().stacksTo(stackSize));
+    }
+}

src/main/java/com/fureniku/metropolis/items/MetroItemToolBase.java

@@ -0,0 +1,8 @@
+package com.fureniku.metropolis.items;
+
+public class MetroItemToolBase extends MetroItemBase {
+
+    public MetroItemToolBase(int durability) {
+        super(new Properties().stacksTo(1).fireResistant().defaultDurability(durability));
+    }
+}

src/main/java/com/fureniku/metropolis/test/RegistrationTest.java

@@ -8,6 +8,7 @@
 import com.fureniku.metropolis.blocks.decorative.helpers.ConnectHorizontalHelper;
 import com.fureniku.metropolis.datagen.MetroBlockStateProvider;
 import com.fureniku.metropolis.enums.BlockConnectionType;
+import com.fureniku.metropolis.items.MetroItemSimple;
 import com.fureniku.metropolis.utils.CreativeTabSet;
 import com.fureniku.metropolis.utils.ShapeUtils;
 import net.minecraft.data.DataGenerator;
@@ -162,6 +163,8 @@ public void init(IEventBus modEventBus) {
                         .setConnectHorizontalHelper(BlockConnectionType.ALL, shapes)
                         .build()));
 
+        registerItem("test_basic_item", MetroItemSimple::new);
+
         /* TODO update to new registration for block entities with buildAs()
         blockNames.add("test_block_entity_decorative");
         TEST_BLOCK_ENTITY_DECORATIVE_ENTITY = registerBlockEntityWithBlock("test_block_entity_decorative", () ->
@@ -180,6 +183,8 @@ public void generateCreativeTabs() {
         for (int i = 0; i < blockNames.size(); i++) {
             _testTab.addItem(getItem(blockNames.get(i)).get().getDefaultInstance());
         }
+
+        //_testTab.addItem(getItem("test_basic_item").get().getDefaultInstance());
     }
 
     @Override

src/main/resources/assets/metropolis/models/item/test_basic_item.json

@@ -0,0 +1,6 @@
+{
+  "parent": "item/generated",
+  "textures": {
+    "layer0": "metropolis:item/test_basic_item"
+  }
+}