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Classic point and click adventure game engine
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package com.bladecoder.engine.ui;

import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.actions.Actions;
import com.badlogic.gdx.scenes.scene2d.ui.Skin;
import com.badlogic.gdx.scenes.scene2d.utils.ChangeListener;
import com.bladecoder.engine.model.World;
import com.bladecoder.engine.ui.InventoryUI.InventoryPos;
import com.bladecoder.engine.ui.InventoryUI.InventoryUIStyle;
import com.bladecoder.engine.util.DPIUtils;

public class InventoryButton extends AnimButton {

	private final InventoryUI inventory;
	private final World world;

	private int numItems = Integer.MAX_VALUE;

	private static ButtonStyle getDefaultStyle(Skin skin) {
		InventoryUIStyle inventoryUIStyle = skin.get(InventoryUIStyle.class);
		ButtonStyle inventoryButtonStyle = inventoryUIStyle.inventoryButtonStyle;

		if (inventoryButtonStyle == null) {
			inventoryButtonStyle = skin.get("inventory", ButtonStyle.class);
		}

		return inventoryButtonStyle;
	}

	public InventoryButton(Skin skin, World w, InventoryUI inv) {
		super(getDefaultStyle(skin));
		this.inventory = inv;
		this.world = w;

		addListener(new ChangeListener() {
			@Override
			public void changed(ChangeEvent event, Actor actor) {
				if (!inventory.isVisible())
					inventory.show();
				else
					inventory.hide();
			}
		});
	}

	@Override
	public void act(float delta) {
		super.act(delta);

		if (numItems < world.getInventory().getNumItems()) {
//			addAction(Actions.repeat(30, Actions.sequence(Actions.rotateBy(40, 1f), Actions.rotateBy(-40, 1f))));
			addAction(Actions.repeat(4, Actions.sequence(Actions.moveBy(20, 0, .06f), Actions.moveBy(-20, 0, .06f))));
//			addAction(Actions.repeat(3, Actions.sequence(Actions.alpha(0, .4f), Actions.alpha(1, .4f))));
		}

		numItems = world.getInventory().getNumItems();
	}

	public void resize(int width, int height) {
		float size = DPIUtils.getPrefButtonSize();
		float margin = DPIUtils.getMarginSize();

		setSize(size, size);

		InventoryPos inventoryPos = inventory.getInventoryPos();

		switch (inventoryPos) {
		case TOP:
			setPosition(margin, height - margin - getHeight());
			break;
		case LEFT:
			setPosition(margin, margin);
			break;
		case RIGHT:
			setPosition(width - margin - getWidth(), margin);
			break;
		case DOWN:
		case CENTER:
			setPosition(margin, margin);
			break;
		default:
			break;
		}
	}
}