TooltipEventHandler.java

package nl.lang2619.bagginses.event;

import com.mojang.realmsclient.gui.ChatFormatting;
import net.minecraft.client.Minecraft;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraftforge.event.entity.player.ItemTooltipEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import nl.lang2619.bagginses.config.ModConfig;
import nl.lang2619.bagginses.items.bags.Bag;
import nl.lang2619.bagginses.items.bags.gui.BagGui;
import nl.lang2619.bagginses.references.BagTypes;
import nl.lang2619.bagginses.references.BlockList;

/**
 * Created by alex_ on 21/04/2016.
 */
public class TooltipEventHandler {

    @SideOnly(Side.CLIENT)
    @SubscribeEvent
    public void tooltip(ItemTooltipEvent e) {
        if (Minecraft.getMinecraft().currentScreen instanceof BagGui) {
            try {
                Bag bag = (Bag) getStack(e.getEntityPlayer()).getItem();
                String color = bag.getColor();

                if (bag.getType() == BagTypes.TIER1
                        || bag.getType() == BagTypes.TIER2) {
                    if (!isItemAllowed(e.getItemStack(), color)) {
                        e.getToolTip().add(ChatFormatting.RED + "This item is not allowed in this bag");
                    }
                }
            } catch (Exception ex) {
                return;
            }
        }
    }

    static boolean isItemAllowed(ItemStack stack, String color) {
        if (ModConfig.whitelist) {
            //Whitelist
            return BlockList.contains(stack.getItem(), stack.getItemDamage(), color);
        }else{
            //Blacklist
            return !BlockList.contains(stack.getItem(), stack.getItemDamage(), color);
        }
    }

    static ItemStack getStack(EntityPlayer p) {
        if (p.getHeldItemMainhand() != null
                && p.getHeldItemMainhand().getItem() instanceof Bag) {
            return p.getHeldItemMainhand();
        } else {
            return p.getHeldItemOffhand();
        }
    }

}