Added the concept of inventories

I'll end myself if I spend any more time on this neverending commit

src/main/java/ru/windcorp/progressia/client/graphics/world/LocalPlayer.java

@@ -21,6 +21,7 @@ package ru.windcorp.progressia.client.graphics.world;
 import org.apache.logging.log4j.LogManager;
 
 import ru.windcorp.progressia.client.Client;
+import ru.windcorp.progressia.client.events.ClientEvent;
 import ru.windcorp.progressia.client.events.NewLocalEntityEvent;
 import ru.windcorp.progressia.client.world.WorldRender;
 import ru.windcorp.progressia.client.world.entity.EntityRenderable;
@@ -83,8 +84,9 @@ public class LocalPlayer {
 		}
 
 		if (playerEntity != lastKnownEntity) {
+			ClientEvent event = new NewLocalEntityEvent.Immutable(getClient(), playerEntity, lastKnownEntity);
 			this.lastKnownEntity = playerEntity;
-			getClient().postEvent(new NewLocalEntityEvent.Immutable(getClient(), playerEntity, lastKnownEntity));
+			getClient().postEvent(event);
 		}
 
 		return playerEntity;

src/main/java/ru/windcorp/progressia/client/graphics/world/hud/HUDManager.java

@@ -17,8 +17,19 @@
  */
 package ru.windcorp.progressia.client.graphics.world.hud;
 
+import com.google.common.eventbus.Subscribe;
+
 import ru.windcorp.progressia.client.Client;
+import ru.windcorp.progressia.client.events.NewLocalEntityEvent;
 import ru.windcorp.progressia.client.graphics.GUI;
+import ru.windcorp.progressia.client.graphics.gui.Component;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryComponent;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryRender;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryRenderRegistry;
+import ru.windcorp.progressia.common.util.crash.CrashReports;
+import ru.windcorp.progressia.common.world.item.inventory.Inventory;
+import ru.windcorp.progressia.common.world.item.inventory.InventoryClosingEvent;
+import ru.windcorp.progressia.common.world.item.inventory.InventoryOpenedEvent;
 
 public class HUDManager implements HUDWorkspace {
 	
@@ -28,6 +39,17 @@ public class HUDManager implements HUDWorkspace {
 	public HUDManager(Client client) {
 		this.client = client;
 		this.layer = new LayerHUD(this);
+		client.subscribe(new Object() {
+			@Subscribe
+			public void onLocalEntityChanged(NewLocalEntityEvent e) {
+				if (e.getNewEntity() != null) {
+					e.getNewEntity().subscribe(HUDManager.this);
+				}
+				if (e.getPreviousEntity() != null) {
+					e.getPreviousEntity().unsubscribe(HUDManager.this);
+				}
+			}
+		});
 	}
 	
 	public void install() {
@@ -39,8 +61,8 @@ public class HUDManager implements HUDWorkspace {
 	}
 	
 	@Override
-	public void openContainer(InventoryComponent component) {
-		InventoryWindow window = new InventoryWindow("Window", component);
+	public void openInventory(InventoryComponent component) {
+		InventoryWindow window = new InventoryWindow("Window", component, this);
 		layer.getWindowManager().addWindow(window);
 	}
 	
@@ -68,5 +90,36 @@ public class HUDManager implements HUDWorkspace {
 	public Client getClient() {
 		return client;
 	}
+	
+	@Subscribe
+	private void onInventoryOpened(InventoryOpenedEvent event) {
+		Inventory inventory = event.getInventory();
+		InventoryRender render = InventoryRenderRegistry.getInstance().get(inventory.getId());
+		
+		if (render == null) {
+			throw CrashReports.report(null, "InventoryRender not found for ID %s", inventory.getId());
+		}
+		
+		try {
+			InventoryComponent component = render.createComponent(inventory, this);
+			openInventory(component);
+		} catch (Exception e) {
+			throw CrashReports.report(null, "Could not open inventory %s", inventory.getId());
+		}
+	}
+	
+	@Subscribe
+	private void onInventoryClosing(InventoryClosingEvent event) {
+		Inventory inventory = event.getInventory();
+		
+		for (Component component : layer.getWindowManager().getChildren()) {
+			if (component instanceof InventoryWindow) {
+				InventoryWindow window = (InventoryWindow) component;
+				if (window.getContent().getInventory() == inventory) {
+					layer.getWindowManager().closeWindow(window);
+				}
+			}
+		}
+	}
 
 }

src/main/java/ru/windcorp/progressia/client/graphics/world/hud/HUDWorkspace.java

@@ -19,6 +19,7 @@ package ru.windcorp.progressia.client.graphics.world.hud;
 
 import ru.windcorp.progressia.client.Client;
 import ru.windcorp.progressia.client.graphics.world.LocalPlayer;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryComponent;
 import ru.windcorp.progressia.common.world.entity.EntityDataPlayer;
 import ru.windcorp.progressia.common.world.item.ItemContainerHand;
 
@@ -38,6 +39,6 @@ public interface HUDWorkspace {
 		return getClient().getLocalPlayer().getEntity().getSelectedHand();
 	}
 	
-	void openContainer(InventoryComponent component);
+	void openInventory(InventoryComponent component);
 
 }

src/main/java/ru/windcorp/progressia/client/graphics/world/hud/InteractiveSlotComponent.java

@@ -121,12 +121,8 @@ public class InteractiveSlotComponent extends Button {
 
 		boolean success = false;
 		
-		if (handSlot.isEmpty() && invSlot.getAmount() == 1 && invSlot.getContents() instanceof ItemDataContainer) {
-			ItemDataContainer item = (ItemDataContainer) invSlot.getContents();
-			if (item.canOpenContainer()) {
-				workspace.openContainer(new SimpleInventoryComponent(item.getContainer(), workspace));
-				success = true;
-			}
+		if (handSlot.isEmpty()) {
+			success = tryToOpen(invSlot);
 		}
 
 		if (!success && handSlot.isEmpty()) {
@@ -146,6 +142,18 @@ public class InteractiveSlotComponent extends Button {
 		}
 	}
 
+	private boolean tryToOpen(ItemSlot invSlot) {
+		if (invSlot.getAmount() != 1) {
+			return false;
+		}
+		if (!(invSlot.getContents() instanceof ItemDataContainer)) {
+			return false;
+		}
+		
+		ItemDataContainer item = (ItemDataContainer) invSlot.getContents();
+		return item.open(workspace.getPlayerEntity()) != null;
+	}
+
 	private void onSingleMoveAction(boolean fromHand) {
 		ItemSlot handSlot = workspace.getHand().slot();
 		ItemSlot invSlot = getSlot();

src/main/java/ru/windcorp/progressia/client/graphics/world/hud/InventoryWindow.java

@@ -17,8 +17,6 @@
  */
 package ru.windcorp.progressia.client.graphics.world.hud;
 
-import java.util.function.Consumer;
-
 import glm.vec._4.Vec4;
 import ru.windcorp.progressia.client.graphics.Colors;
 import ru.windcorp.progressia.client.graphics.flat.RenderTarget;
@@ -34,6 +32,7 @@ import ru.windcorp.progressia.client.graphics.gui.layout.LayoutFill;
 import ru.windcorp.progressia.client.graphics.gui.layout.LayoutVertical;
 import ru.windcorp.progressia.client.localization.MutableString;
 import ru.windcorp.progressia.client.localization.MutableStringLocalized;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryComponent;
 
 public class InventoryWindow extends Panel {
 	
@@ -41,13 +40,18 @@ public class InventoryWindow extends Panel {
 	private static final Vec4 CLOSE_BUTTON_IDLE = Colors.toVector(0xFFBC1515);
 	private static final Vec4 CLOSE_BUTTON_HOVER = Colors.toVector(0xFFFA6464);
 	private static final Vec4 CLOSE_BUTTON_PRESSED = Colors.BLACK;
+	
+	private final InventoryComponent content;
+	private final HUDWorkspace workspace;
 
-	public InventoryWindow(String name, InventoryComponent component) {
+	public InventoryWindow(String name, InventoryComponent component, HUDWorkspace workspace) {
 		super(name, new LayoutVertical(15, 15));
+		this.content = component;
+		this.workspace = workspace;
 
 		Group titleBar = new Group(getName() + ".TitleBar", new LayoutBorderHorizontal());
 		titleBar.addChild(createLabel(component).setLayoutHint(LayoutBorderHorizontal.CENTER));
-		titleBar.addChild(createCloseButton().setLayoutHint(LayoutBorderHorizontal.RIGHT));
+		titleBar.addChild(createCloseButton(component).setLayoutHint(LayoutBorderHorizontal.RIGHT));
 
 		addChild(titleBar);
 
@@ -55,21 +59,22 @@ public class InventoryWindow extends Panel {
 	}
 
 	private Label createLabel(InventoryComponent component) {
-		String translationKey = "Inventory." + component.getContainer().getId() + ".Title";
+		String translationKey = "Inventory." + component.getInventory().getId() + ".Title";
 		MutableString titleText = new MutableStringLocalized(translationKey);
 		Font titleFont = new Font().deriveBold().withColor(Colors.BLACK).withAlign(Typeface.ALIGN_LEFT);
 
 		return new Label(getName() + ".Title", titleFont, titleText);
 	}
 
-	private void doWithManager(Consumer<WindowedHUD> action) {
+	private WindowedHUD getManager() {
 		Component parent = getParent();
 		if (parent instanceof WindowedHUD) {
-			action.accept((WindowedHUD) parent);
+			return (WindowedHUD) parent;
 		}
+		return null;
 	}
 
-	private Component createCloseButton() {
+	private Component createCloseButton(InventoryComponent component) {
 		
 		Button button = new Button(getName() + ".CloseButton", CLOSE_CHAR) {
 			
@@ -91,7 +96,18 @@ public class InventoryWindow extends Panel {
 			
 		};
 		
-		button.addAction(b -> doWithManager(manager -> manager.closeWindow(this)));
+		button.addAction(b -> {
+			
+			content.getInventory().close(workspace.getPlayerEntity());
+			
+			WindowedHUD manager = getManager();
+			if (manager == null) {
+				return;
+			}
+			
+			manager.closeWindow(this);
+			
+		});
 
 		button.setLayout(new LayoutFill());
 		
@@ -100,5 +116,9 @@ public class InventoryWindow extends Panel {
 		
 		return button;
 	}
+	
+	public InventoryComponent getContent() {
+		return content;
+	}
 
 }

src/main/java/ru/windcorp/progressia/client/graphics/world/hud/SlotComponent.java

@@ -19,6 +19,7 @@ package ru.windcorp.progressia.client.graphics.world.hud;
 
 import java.util.function.BooleanSupplier;
 import glm.mat._4.Mat4;
+import ru.windcorp.progressia.client.graphics.Colors;
 import ru.windcorp.progressia.client.graphics.flat.FlatRenderProgram;
 import ru.windcorp.progressia.client.graphics.flat.RenderTarget;
 import ru.windcorp.progressia.client.graphics.font.Font;
@@ -26,18 +27,22 @@ import ru.windcorp.progressia.client.graphics.gui.Component;
 import ru.windcorp.progressia.client.graphics.gui.DynamicLabel;
 import ru.windcorp.progressia.client.graphics.gui.layout.LayoutAlign;
 import ru.windcorp.progressia.client.graphics.model.Renderable;
+import ru.windcorp.progressia.client.graphics.model.ShapeRenderHelper;
 import ru.windcorp.progressia.client.graphics.model.Shapes.PgmBuilder;
 import ru.windcorp.progressia.client.graphics.texture.Texture;
 import ru.windcorp.progressia.client.world.item.ItemRenderRegistry;
 import ru.windcorp.progressia.client.world.item.ItemRenderable;
 import ru.windcorp.progressia.common.world.item.ItemContainer;
 import ru.windcorp.progressia.common.world.item.ItemData;
+import ru.windcorp.progressia.common.world.item.ItemDataContainer;
 import ru.windcorp.progressia.common.world.item.ItemSlot;
 
 public class SlotComponent extends Component {
 
 	static final float TEXTURE_SIZE = 24;
 
+	private static Renderable containerOpenDecoration = null;
+
 	private final ItemContainer container;
 	private final int index;
 
@@ -62,6 +67,13 @@ public class SlotComponent extends Component {
 		addChild(new DynamicLabel(getName() + ".Size", sizeFont, () -> amountDisplayString, getPreferredSize().x));
 
 		setLayout(new LayoutAlign(0, 0, 0));
+
+		if (containerOpenDecoration == null) {
+			containerOpenDecoration = new PgmBuilder(
+				FlatRenderProgram.getDefault(),
+				HUDTextures.getHUDTexture("DecorationContainerOpen")
+			).setSize(TEXTURE_SIZE + 2).setOrigin(-1, -1, 0).create();
+		}
 	}
 
 	public ItemSlot getSlot() {
@@ -83,11 +95,11 @@ public class SlotComponent extends Component {
 		setBackgroundDisplayCondition(when);
 		return this;
 	}
-	
+
 	public SlotComponent setBackground(Texture texture) {
 		return setBackground(texture, null);
 	}
-	
+
 	public SlotComponent setBackgroundDisplayCondition(BooleanSupplier backgroundCondition) {
 		this.backgroundCondition = backgroundCondition;
 		return this;
@@ -120,13 +132,14 @@ public class SlotComponent extends Component {
 	}
 
 	private void assembleItem(RenderTarget target) {
-		target.pushTransform(new Mat4().translate(getX(), getY(), 0).scale(scale));
+		target.pushTransform(new Mat4().translate(getX(), getY(), 0).scale(scale, scale, 1));
 		target.addCustomRenderer(renderer -> {
 
 			updateItemRenderer();
 
 			if (itemRenderer != null) {
 				itemRenderer.render(renderer);
+				renderDecorations(renderer);
 			} else if (background != null) {
 				if (backgroundCondition == null || backgroundCondition.getAsBoolean()) {
 					background.render(renderer);
@@ -137,4 +150,17 @@ public class SlotComponent extends Component {
 		target.popTransform();
 	}
 
+	private void renderDecorations(ShapeRenderHelper renderer) {
+		ItemData contents = getSlot().getContents();
+
+		if (contents instanceof ItemDataContainer) {
+			ItemDataContainer asContainer = (ItemDataContainer) contents;
+			if (asContainer.isOpen()) {
+				renderer.pushColorMultiplier().mul(Colors.BLUE);
+				containerOpenDecoration.render(renderer);
+				renderer.popColorMultiplier();
+			}
+		}
+	}
+
 }

src/main/java/ru/windcorp/progressia/client/world/item/inventory/ContainerComponent.java

@@ -0,0 +1,36 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.client.world.item.inventory;
+
+import java.util.Collection;
+
+import ru.windcorp.progressia.client.graphics.gui.Component;
+import ru.windcorp.progressia.client.graphics.world.hud.InteractiveSlotComponent;
+import ru.windcorp.progressia.common.world.item.ItemContainer;
+
+public abstract class ContainerComponent extends Component {
+
+	public ContainerComponent(String name) {
+		super(name);
+	}
+
+	public abstract ItemContainer getContainer();
+	
+	public abstract Collection<InteractiveSlotComponent> getSlots();
+
+}

src/main/java/ru/windcorp/progressia/client/world/item/inventory/ContainerComponentSimple.java

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package ru.windcorp.progressia.client.graphics.world.hud;
+package ru.windcorp.progressia.client.world.item.inventory;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -27,15 +27,19 @@ import ru.windcorp.progressia.client.graphics.gui.Group;
 import ru.windcorp.progressia.client.graphics.gui.layout.LayoutBorderHorizontal;
 import ru.windcorp.progressia.client.graphics.gui.layout.LayoutBorderVertical;
 import ru.windcorp.progressia.client.graphics.gui.layout.LayoutGrid;
+import ru.windcorp.progressia.client.graphics.world.hud.Bar;
+import ru.windcorp.progressia.client.graphics.world.hud.HUDWorkspace;
+import ru.windcorp.progressia.client.graphics.world.hud.InteractiveSlotComponent;
 import ru.windcorp.progressia.common.world.item.ItemContainer;
 
-public class SimpleInventoryComponent extends InventoryComponent {
+public class ContainerComponentSimple extends ContainerComponent {
 
 	private final Group slots = new Group("Inventory.Slots", new LayoutGrid(0, 15));
 	private final Collection<InteractiveSlotComponent> slotCollection = new ArrayList<>();
+	
 	private final ItemContainer container;
 
-	public SimpleInventoryComponent(ItemContainer container, HUDWorkspace workspace) {
+	public ContainerComponentSimple(ItemContainer container, HUDWorkspace workspace) {
 		super("Inventory");
 		this.container = container;
 
@@ -80,7 +84,7 @@ public class SimpleInventoryComponent extends InventoryComponent {
 		slots.addChild(component.setLayoutHint(pos));
 		slotCollection.add(component);
 	}
-	
+
 	@Override
 	public ItemContainer getContainer() {
 		return container;

src/main/java/ru/windcorp/progressia/client/world/item/inventory/InventoryComponent.java

@@ -15,21 +15,21 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package ru.windcorp.progressia.client.graphics.world.hud;
+package ru.windcorp.progressia.client.world.item.inventory;
 
 import java.util.Collection;
 
 import ru.windcorp.progressia.client.graphics.gui.Component;
-import ru.windcorp.progressia.common.world.item.ItemContainer;
+import ru.windcorp.progressia.common.world.item.inventory.Inventory;
 
 public abstract class InventoryComponent extends Component {
 
 	public InventoryComponent(String name) {
 		super(name);
 	}
-
-	public abstract ItemContainer getContainer();
 	
-	public abstract Collection<InteractiveSlotComponent> getSlots();
+	public abstract Inventory getInventory();
+	
+	public abstract Collection<? extends ContainerComponent> getContainers();
 
 }

src/main/java/ru/windcorp/progressia/client/world/item/inventory/InventoryComponentSimple.java

@@ -0,0 +1,55 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.client.world.item.inventory;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import ru.windcorp.progressia.client.graphics.gui.layout.LayoutFill;
+import ru.windcorp.progressia.client.graphics.world.hud.HUDWorkspace;
+import ru.windcorp.progressia.common.world.item.ItemContainer;
+import ru.windcorp.progressia.common.world.item.inventory.Inventory;
+
+public class InventoryComponentSimple extends InventoryComponent {
+	
+	private final Inventory inventory;
+	private final Collection<ContainerComponentSimple> containers = new ArrayList<>();
+
+	public InventoryComponentSimple(String name, Inventory inventory, HUDWorkspace workspace) {
+		super(name);
+		setLayout(new LayoutFill());
+		this.inventory = inventory;
+		
+		for (ItemContainer container : inventory.getContainers()) {
+			ContainerComponentSimple component = new ContainerComponentSimple(container, workspace);
+			containers.add(component);
+			addChild(component);
+		}
+	}
+
+	@Override
+	public Inventory getInventory() {
+		return inventory;
+	}
+
+	@Override
+	public Collection<? extends ContainerComponent> getContainers() {
+		return containers;
+	}
+
+}

src/main/java/ru/windcorp/progressia/client/world/item/inventory/InventoryRender.java

@@ -0,0 +1,32 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.client.world.item.inventory;
+
+import ru.windcorp.progressia.client.graphics.world.hud.HUDWorkspace;
+import ru.windcorp.progressia.common.util.namespaces.Namespaced;
+import ru.windcorp.progressia.common.world.item.inventory.Inventory;
+
+public abstract class InventoryRender extends Namespaced {
+
+	public InventoryRender(String id) {
+		super(id);
+	}
+	
+	public abstract InventoryComponent createComponent(Inventory inventory, HUDWorkspace workspace);
+
+}

src/main/java/ru/windcorp/progressia/client/world/item/inventory/InventoryRenderRegistry.java

@@ -0,0 +1,30 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.client.world.item.inventory;
+
+import ru.windcorp.progressia.common.util.namespaces.NamespacedInstanceRegistry;
+
+public class InventoryRenderRegistry extends NamespacedInstanceRegistry<InventoryRender> {
+	
+	private static final InventoryRenderRegistry INSTANCE = new InventoryRenderRegistry();
+	
+	public static InventoryRenderRegistry getInstance() {
+		return INSTANCE;
+	}
+
+}

src/main/java/ru/windcorp/progressia/common/state/BooleanStateField.java

@@ -0,0 +1,87 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package ru.windcorp.progressia.common.state;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+
+public class BooleanStateField extends StateField {
+
+	public BooleanStateField(
+		String id,
+		boolean isLocal,
+		int index
+	) {
+		super(id, isLocal, index);
+	}
+
+	public boolean get(StatefulObject object) {
+		return object.getStorage().getBoolean(getIndex());
+	}
+
+	public void setNow(StatefulObject object, boolean value) {
+		object.getStorage().setBoolean(getIndex(), value);
+	}
+
+	public void set(StateChanger changer, boolean value) {
+		changer.setBoolean(this, value);
+	}
+
+	@Override
+	public void read(
+		StatefulObject object,
+		DataInput input,
+		IOContext context
+	)
+		throws IOException {
+		object.getStorage().setBoolean(getIndex(), input.readBoolean());
+	}
+
+	@Override
+	public void write(
+		StatefulObject object,
+		DataOutput output,
+		IOContext context
+	)
+		throws IOException {
+		output.writeBoolean(object.getStorage().getBoolean(getIndex()));
+	}
+
+	@Override
+	public void copy(StatefulObject from, StatefulObject to) {
+		setNow(to, get(from));
+	}
+
+	@Override
+	public int computeHashCode(StatefulObject object) {
+		return Boolean.hashCode(get(object));
+	}
+
+	@Override
+	public boolean areEqual(StatefulObject a, StatefulObject b) {
+		return get(a) == get(b);
+	}
+	
+	@Override
+	public void setDefault(StateStorage storage) {
+		storage.setBoolean(getIndex(), false);
+	}
+
+}

src/main/java/ru/windcorp/progressia/common/state/HashMapStateStorage.java

@@ -22,10 +22,13 @@ import gnu.trove.map.TIntIntMap;
 import gnu.trove.map.TIntObjectMap;
 import gnu.trove.map.hash.TIntIntHashMap;
 import gnu.trove.map.hash.TIntObjectHashMap;
+import gnu.trove.set.TIntSet;
+import gnu.trove.set.hash.TIntHashSet;
 
 public class HashMapStateStorage extends StateStorage {
 
 	private final TIntIntMap ints = new TIntIntHashMap();
+	private final TIntSet booleans = new TIntHashSet();
 	private final TIntObjectMap<Object> objects = new TIntObjectHashMap<>();
 
 	@Override
@@ -38,6 +41,20 @@ public class HashMapStateStorage extends StateStorage {
 		ints.put(index, value);
 	}
 	
+	@Override
+	public boolean getBoolean(int index) {
+		return booleans.contains(index);
+	}
+	
+	@Override
+	public void setBoolean(int index, boolean value) {
+		if (value) {
+			booleans.add(index);
+		} else {
+			booleans.remove(index);
+		}
+	}
+	
 	@Override
 	public Object getObject(int index) {
 		return objects.get(index);

src/main/java/ru/windcorp/progressia/common/state/InspectingStatefulObjectLayout.java

@@ -85,6 +85,21 @@ public class InspectingStatefulObjectLayout
 
 		}
 		
+		private class Boolean implements StateFieldBuilder.Boolean {
+			
+			@Override
+			public BooleanStateField build() {
+				return registerField(
+					new BooleanStateField(
+						id,
+						isLocal,
+						fieldIndexCounters.getBooleansThenIncrement()
+					)
+				);
+			}
+			
+		}
+		
 		private class Obj<T> implements StateFieldBuilder.Obj<T> {
 
 			private final ObjectCodec<T> codec;
@@ -123,6 +138,11 @@ public class InspectingStatefulObjectLayout
 			return new Int();
 		}
 		
+		@Override
+		public Boolean ofBoolean() {
+			return new Boolean();
+		}
+		
 		@Override
 		public <T> Obj<T> of(ObjectCodec<T> codec, Supplier<T> defaultValue) {
 			return new Obj<T>(codec, defaultValue);

src/main/java/ru/windcorp/progressia/common/state/OptimizedStateStorage.java

@@ -21,11 +21,13 @@ package ru.windcorp.progressia.common.state;
 public class OptimizedStateStorage extends StateStorage {
 
 	private final int[] ints;
+	private final boolean[] booleans;
 	private final Object[] objects;
 
 	public OptimizedStateStorage(PrimitiveCounters sizes) {
-		this.ints = new int[sizes.getInts()];
-		this.objects = new Object[sizes.getObjects()];
+		this.ints = sizes.getInts() == 0 ? null : new int[sizes.getInts()];
+		this.booleans = sizes.getBooleans() == 0 ? null : new boolean[sizes.getBooleans()];
+		this.objects = sizes.getObjects() == 0 ? null : new Object[sizes.getObjects()];
 	}
 
 	@Override
@@ -38,6 +40,16 @@ public class OptimizedStateStorage extends StateStorage {
 		ints[index] = value;
 	}
 	
+	@Override
+	public boolean getBoolean(int index) {
+		return booleans[index];
+	}
+	
+	@Override
+	public void setBoolean(int index, boolean value) {
+		booleans[index] = value;
+	}
+	
 	@Override
 	public Object getObject(int index) {
 		return objects[index];

src/main/java/ru/windcorp/progressia/common/state/OptimizedStatefulObjectLayout.java

@@ -75,6 +75,16 @@ public class OptimizedStatefulObjectLayout
 			};
 		}
 		
+		@Override
+		public Boolean ofBoolean() {
+			return new Boolean() {
+				@Override
+				public BooleanStateField build() {
+					return (BooleanStateField) result;
+				}
+			};
+		}
+		
 		@Override
 		public <T> Obj<T> of(ObjectCodec<T> codec, Supplier<T> defaultValue) {
 			return new Obj<T>() {

src/main/java/ru/windcorp/progressia/common/state/PrimitiveCounters.java

@@ -21,6 +21,7 @@ package ru.windcorp.progressia.common.state;
 class PrimitiveCounters {
 
 	private int ints = 0;
+	private int booleans = 0;
 	private int objects = 0;
 
 	public PrimitiveCounters() {
@@ -28,6 +29,7 @@ class PrimitiveCounters {
 
 	public PrimitiveCounters(PrimitiveCounters copyFrom) {
 		this.ints = copyFrom.ints;
+		this.booleans = copyFrom.booleans;
 		this.objects = copyFrom.objects;
 	}
 
@@ -39,6 +41,14 @@ class PrimitiveCounters {
 		return this.ints++;
 	}
 	
+	public int getBooleans() {
+		return booleans;
+	}
+	
+	public int getBooleansThenIncrement() {
+		return this.booleans++;
+	}
+	
 	public int getObjects() {
 		return objects;
 	}

src/main/java/ru/windcorp/progressia/common/state/StateChanger.java

@@ -21,6 +21,7 @@ package ru.windcorp.progressia.common.state;
 public interface StateChanger {
 
 	void setInt(IntStateField field, int value);
+	void setBoolean(BooleanStateField field, boolean value);
 	<T> void setObject(ObjectStateField<T> field, T value);
 
 }

src/main/java/ru/windcorp/progressia/common/state/StateFieldBuilder.java

@@ -29,12 +29,18 @@ public interface StateFieldBuilder {
 		IntStateField build();
 	}
 	
+	public static interface Boolean {
+		BooleanStateField build();
+	}
+	
 	public static interface Obj<T> {
 		ObjectStateField<T> build();
 	}
 
 	Int ofInt();
 	
+	Boolean ofBoolean();
+	
 	<T> Obj<T> of(ObjectCodec<T> codec, Supplier<T> defaultValue);
 	
 	default <T> Obj<T> of(Class<T> clazz, Supplier<T> defaultValue) {

src/main/java/ru/windcorp/progressia/common/state/StateStorage.java

@@ -24,6 +24,10 @@ public abstract class StateStorage {
 
 	public abstract void setInt(int index, int value);
 	
+	public abstract boolean getBoolean(int index);
+
+	public abstract void setBoolean(int index, boolean value);
+	
 	public abstract Object getObject(int index);
 	
 	public abstract void setObject(int index, Object object);

src/main/java/ru/windcorp/progressia/common/world/entity/EntityDataPlayer.java

@@ -17,17 +17,26 @@
  */
 package ru.windcorp.progressia.common.world.entity;
 
+import com.google.common.eventbus.EventBus;
+import com.google.common.eventbus.Subscribe;
+
 import ru.windcorp.progressia.common.state.IntStateField;
 import ru.windcorp.progressia.common.state.ObjectStateField;
+import ru.windcorp.progressia.common.util.crash.ReportingEventBus;
 import ru.windcorp.progressia.common.world.item.ItemContainerEquipment;
 import ru.windcorp.progressia.common.world.item.ItemContainerHand;
+import ru.windcorp.progressia.common.world.item.inventory.InventoryClosingEvent;
+import ru.windcorp.progressia.common.world.item.inventory.InventoryOpenedEvent;
+import ru.windcorp.progressia.common.world.item.inventory.InventoryUser;
 
-public class EntityDataPlayer extends EntityData {
+public class EntityDataPlayer extends EntityData implements InventoryUser {
 
 	private final ObjectStateField<SpeciesDatalet> speciesDatalet = field("Core:SpeciesDatalet").setShared()
 		.of(SpeciesDataRegistry.getInstance().getCodec()).build();
 	
 	private final IntStateField selectedHand = field("Core:SelectedHand").setShared().ofInt().build();
+	
+	private final EventBus eventBus = ReportingEventBus.create("EntityDataPlayer");
 
 	public EntityDataPlayer(String id, SpeciesData species) {
 		super(id);
@@ -71,5 +80,23 @@ public class EntityDataPlayer extends EntityData {
 	public ItemContainerHand getSelectedHand() {
 		return getHand(getSelectedHandIndex());
 	}
+	
+	@Subscribe
+	private void onInventoryOpened(InventoryOpenedEvent event) {
+		eventBus.post(event);
+	}
+	
+	@Subscribe
+	private void onInventoryClosed(InventoryClosingEvent event) {
+		eventBus.post(event);
+	}
+	
+	public void subscribe(Object listener) {
+		eventBus.register(listener);
+	}
+	
+	public void unsubscribe(Object listener) {
+		eventBus.unregister(listener);
+	}
 
 }

src/main/java/ru/windcorp/progressia/common/world/item/ItemContainer.java

@@ -23,6 +23,7 @@ import java.util.function.Consumer;
 
 import ru.windcorp.progressia.common.state.Encodable;
 import ru.windcorp.progressia.common.util.namespaces.Namespaced;
+import ru.windcorp.progressia.common.world.item.inventory.Inventory;
 
 /**
  * A collection of {@link ItemSlot}s representing a single storage unit. A
@@ -34,10 +35,20 @@ import ru.windcorp.progressia.common.util.namespaces.Namespaced;
  * through <i>n</i> - 1.
  */
 public abstract class ItemContainer extends Namespaced implements Encodable, Iterable<ItemSlot> {
+	
+	private Inventory inventory;
 
 	public ItemContainer(String id) {
 		super(id);
 	}
+	
+	public Inventory getInventory() {
+		return inventory;
+	}
+	
+	public void setInventory(Inventory inventory) {
+		this.inventory = inventory;
+	}
 
 	/**
 	 * Retrieves the slot with the given index.

src/main/java/ru/windcorp/progressia/common/world/item/ItemDataContainer.java

@@ -18,18 +18,21 @@
 package ru.windcorp.progressia.common.world.item;
 
 import ru.windcorp.progressia.common.state.ObjectStateField;
+import ru.windcorp.progressia.common.world.item.inventory.InventorySimple;
+import ru.windcorp.progressia.common.world.item.inventory.InventoryUser;
 
 public class ItemDataContainer extends ItemData {
-	
-	private final ObjectStateField<ItemContainer> container = field("Core:Contents").def(this::createContainer).build();
-	
+
+	private final ObjectStateField<InventorySimple> inventory = field("Core:Contents").setShared().def(this::createInventory)
+		.build();
+
 	private final float ownMass;
 	private final float containerMassLimit;
-	
+
 	private final float ownVolume;
 	private final float containerVolumeLimit;
 	private final boolean containerContributesVolume;
-	
+
 	public ItemDataContainer(
 		String id,
 		float ownMass,
@@ -46,27 +49,49 @@ public class ItemDataContainer extends ItemData {
 		this.containerContributesVolume = containerContributesVolume;
 	}
 
-	protected ItemContainer createContainer() {
-		return new ItemContainerMixedSimple(getId(), containerMassLimit, containerVolumeLimit, 10);
+	protected InventorySimple createInventory() {
+		return new InventorySimple(
+			getId(),
+			new ItemContainerMixedSimple(getId(), containerMassLimit, containerVolumeLimit, 10)
+		);
 	}
 	
-	public ItemContainer getContainer() {
-		return container.get(this);
+	public InventorySimple getInventory() {
+		return inventory.get(this);
 	}
-	
-	public boolean canOpenContainer() {
+
+	public boolean isOpen() {
+		return !getInventory().getUsers().isEmpty();
+	}
+
+	public boolean canOpen(InventoryUser user) {
 		return true;
 	}
 
+	public synchronized InventorySimple open(InventoryUser user) {
+		if (isOpen()) {
+			return null;
+		} else if (!canOpen(user)) {
+			return null;
+		} else {
+			getInventory().open(user);
+			return getInventory();
+		}
+	}
+
+	public synchronized void close() {
+		getInventory().closeAll();
+	}
+
 	@Override
 	public float getMass() {
-		return ownMass + getContainer().getMass();
+		return ownMass + getInventory().getMass();
 	}
 
 	@Override
 	public float getVolume() {
 		if (containerContributesVolume) {
-			return ownVolume + getContainer().getVolume();
+			return ownVolume + getInventory().getVolume();
 		} else {
 			return ownVolume;
 		}

src/main/java/ru/windcorp/progressia/common/world/item/inventory/Inventory.java

@@ -0,0 +1,141 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.common.world.item.inventory;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.function.Consumer;
+
+import com.google.common.eventbus.EventBus;
+
+import ru.windcorp.progressia.common.state.Encodable;
+import ru.windcorp.progressia.common.state.IOContext;
+import ru.windcorp.progressia.common.util.crash.ReportingEventBus;
+import ru.windcorp.progressia.common.util.namespaces.Namespaced;
+import ru.windcorp.progressia.common.world.item.ItemContainer;
+
+public class Inventory extends Namespaced implements Encodable {
+	
+	private final ItemContainer[] containers;
+	private final List<InventoryUser> users = new ArrayList<>();
+	
+	private EventBus eventBus = null;
+
+	public Inventory(String id, ItemContainer... containers) {
+		super(id);
+		this.containers = containers;
+		for (ItemContainer container : containers) {
+			container.setInventory(this);
+		}
+	}
+	
+	public synchronized void open(InventoryUser user) {
+		users.add(user);
+		subscribe(user);
+		eventBus.post(new InventoryOpenedEvent(this, user));
+	}
+	
+	public synchronized void close(InventoryUser user) {
+		if (eventBus != null) {
+			eventBus.post(new InventoryClosingEvent(this, user));
+		}
+		
+		users.remove(user);
+		unsubscribe(user);
+	}
+	
+	public synchronized void subscribe(Object listener) {
+		if (eventBus == null) {
+			eventBus = ReportingEventBus.create("Inventory " + getId());
+		}
+		eventBus.register(listener);
+	}
+	
+	public synchronized void unsubscribe(Object listener) {
+		if (eventBus == null) {
+			return;
+		}
+		eventBus.unregister(listener);
+	}
+	
+	public synchronized boolean isUser(InventoryUser user) {
+		return users.contains(user);
+	}
+	
+	public synchronized void forEachUser(Consumer<? super InventoryUser> action) {
+		users.forEach(action);
+	}
+	
+	public Collection<InventoryUser> getUsers() {
+		return users;
+	}
+	
+	public synchronized void closeAll() {
+		while (!users.isEmpty()) {
+			close(users.get(0));
+		}
+	}
+	
+	public ItemContainer[] getContainers() {
+		return containers;
+	}
+	
+	public synchronized float getMass() {
+		float sum = 0;
+		for (ItemContainer container : containers) {
+			sum += container.getMass();
+		}
+		return sum;
+	}
+	
+	public synchronized float getVolume() {
+		float sum = 0;
+		for (ItemContainer container : containers) {
+			sum += container.getVolume();
+		}
+		return sum;
+	}
+	
+	@Override
+	public synchronized void read(DataInput input, IOContext context) throws IOException {
+		for (ItemContainer container : containers) {
+			container.read(input, context);
+		}
+	}
+	
+	@Override
+	public synchronized void write(DataOutput output, IOContext context) throws IOException {
+		for (ItemContainer container : containers) {
+			container.write(output, context);
+		}
+	}
+	
+	@Override
+	public synchronized void copy(Encodable destination) {
+		Inventory inventory = (Inventory) destination;
+		assert inventory.containers.length == containers.length;
+		for (int i = 0; i < containers.length; ++i) {
+			containers[i].copy(inventory.containers[i]);
+		}
+	}
+
+}

src/main/java/ru/windcorp/progressia/common/world/item/inventory/InventoryClosingEvent.java

@@ -0,0 +1,33 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.common.world.item.inventory;
+
+public class InventoryClosingEvent extends InventoryEvent {
+	
+	private final InventoryUser closingUser;
+
+	public InventoryClosingEvent(Inventory inventory, InventoryUser closingUser) {
+		super(inventory);
+		this.closingUser = closingUser;
+	}
+	
+	public InventoryUser getClosingUser() {
+		return closingUser;
+	}
+
+}

src/main/java/ru/windcorp/progressia/common/world/item/inventory/InventoryEvent.java

@@ -0,0 +1,35 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.common.world.item.inventory;
+
+public abstract class InventoryEvent {
+	
+	private final Inventory inventory;
+	
+	public InventoryEvent(Inventory inventory) {
+		this.inventory = inventory;
+	}
+
+	/**
+	 * @return the inventory
+	 */
+	public Inventory getInventory() {
+		return inventory;
+	}
+
+}

src/main/java/ru/windcorp/progressia/common/world/item/inventory/InventoryOpenedEvent.java

@@ -0,0 +1,36 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.common.world.item.inventory;
+
+public class InventoryOpenedEvent extends InventoryEvent {
+	
+	private final InventoryUser newUser;
+
+	public InventoryOpenedEvent(Inventory inventory, InventoryUser newUser) {
+		super(inventory);
+		this.newUser = newUser;
+	}
+	
+	/**
+	 * @return the newUser
+	 */
+	public InventoryUser getNewUser() {
+		return newUser;
+	}
+
+}

src/main/java/ru/windcorp/progressia/common/world/item/inventory/InventorySimple.java

@@ -0,0 +1,32 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.common.world.item.inventory;
+
+import ru.windcorp.progressia.common.world.item.ItemContainer;
+
+public class InventorySimple extends Inventory {
+
+	public InventorySimple(String id, ItemContainer container) {
+		super(id, container);
+	}
+	
+	public ItemContainer getContainer() {
+		return getContainers()[0];
+	}
+
+}

src/main/java/ru/windcorp/progressia/common/world/item/inventory/InventoryUser.java

@@ -0,0 +1,34 @@
+/*
+ * Progressia
+ * Copyright (C)  2020-2021  Wind Corporation and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package ru.windcorp.progressia.common.world.item.inventory;
+
+public interface InventoryUser {
+	
+	default void open(Inventory inventory) {
+		inventory.open(this);
+	}
+	
+	default void close(Inventory inventory) {
+		inventory.close(this);
+	}
+	
+	default boolean isUsing(Inventory inventory) {
+		return inventory.isUser(this);
+	}
+
+}

src/main/java/ru/windcorp/progressia/test/TestContent.java

@@ -36,6 +36,7 @@ import ru.windcorp.progressia.client.comms.controls.*;
 import ru.windcorp.progressia.client.graphics.input.KeyEvent;
 import ru.windcorp.progressia.client.graphics.input.KeyMatcher;
 import ru.windcorp.progressia.client.graphics.world.Selection;
+import ru.windcorp.progressia.client.graphics.world.hud.HUDWorkspace;
 import ru.windcorp.progressia.client.world.block.*;
 import ru.windcorp.progressia.client.world.cro.ChunkRenderOptimizerRegistry;
 import ru.windcorp.progressia.client.world.cro.ChunkRenderOptimizerSimple;
@@ -44,6 +45,10 @@ import ru.windcorp.progressia.client.world.entity.*;
 import ru.windcorp.progressia.client.world.item.ItemRender;
 import ru.windcorp.progressia.client.world.item.ItemRenderRegistry;
 import ru.windcorp.progressia.client.world.item.ItemRenderSimple;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryComponent;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryComponentSimple;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryRender;
+import ru.windcorp.progressia.client.world.item.inventory.InventoryRenderRegistry;
 import ru.windcorp.progressia.client.world.tile.*;
 import ru.windcorp.progressia.common.Units;
 import ru.windcorp.progressia.common.collision.CollisionModel;
@@ -57,6 +62,7 @@ import ru.windcorp.progressia.common.world.item.ItemData;
 import ru.windcorp.progressia.common.world.item.ItemDataContainer;
 import ru.windcorp.progressia.common.world.item.ItemDataRegistry;
 import ru.windcorp.progressia.common.world.item.ItemDataSimple;
+import ru.windcorp.progressia.common.world.item.inventory.Inventory;
 import ru.windcorp.progressia.common.world.rels.AbsFace;
 import ru.windcorp.progressia.common.world.tile.*;
 import ru.windcorp.progressia.server.Server;
@@ -258,6 +264,7 @@ public class TestContent {
 			)
 		);
 		register(new ItemRenderSimple("Test:CardboardBackpack", getItemTexture("CardboardBackpack")));
+		registerSimplestInventory("Test:CardboardBackpack");
 	}
 
 	private static void registerSimplestBlock(String name) {
@@ -301,6 +308,15 @@ public class TestContent {
 		register(new TestEntityRenderStatie("Test:Statie"));
 		register(new TestEntityLogicStatie("Test:Statie"));
 	}
+	
+	private static void registerSimplestInventory(String id) {
+		InventoryRenderRegistry.getInstance().register(new InventoryRender(id) {
+			@Override
+			public InventoryComponent createComponent(Inventory inventory, HUDWorkspace workspace) {
+				return new InventoryComponentSimple(id, inventory, workspace);
+			}
+		});
+	}
 
 	private static void registerPlayer() {
 		SpeciesData human = new SpeciesDataHuman("Core:Human");