NotEnoughItems/src/main/java/codechicken/nei/api/GuiInfo.java

package codechicken.nei.api;

import java.util.HashSet;
import java.util.LinkedList;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.client.gui.inventory.GuiContainerCreative;

import codechicken.lib.vec.Rectangle4i;
import codechicken.nei.NEIChestGuiHandler;
import codechicken.nei.NEICreativeGuiHandler;
import codechicken.nei.NEIDummySlotHandler;
import codechicken.nei.NEIPotionGuiHandler;
import codechicken.nei.recipe.CheatItemHandler;
import codechicken.nei.recipe.FillFluidContainerHandler;
import codechicken.nei.recipe.SearchInputDropHandler;

public class GuiInfo {

    public static final LinkedList<INEIGuiHandler> guiHandlers = new LinkedList<>();
    public static final HashSet<Class<? extends GuiContainer>> customSlotGuis = new HashSet<>();
    public static ReentrantReadWriteLock guiHandlersLock = new ReentrantReadWriteLock();
    public static Lock writeLock = guiHandlersLock.writeLock();
    public static Lock readLock = guiHandlersLock.readLock();

    public static void load() {
        API.registerNEIGuiHandler(new NEICreativeGuiHandler());
        API.registerNEIGuiHandler(new NEIChestGuiHandler());
        API.registerNEIGuiHandler(new NEIDummySlotHandler());
        API.registerNEIGuiHandler(new SearchInputDropHandler());
        API.registerNEIGuiHandler(new FillFluidContainerHandler());
        API.registerNEIGuiHandler(new CheatItemHandler());
        API.registerNEIGuiHandler(new NEIPotionGuiHandler());
        customSlotGuis.add(GuiContainerCreative.class);
    }

    public static void clearGuiHandlers() {
        try {
            GuiInfo.writeLock.lock();
            guiHandlers.removeIf(ineiGuiHandler -> ineiGuiHandler instanceof GuiContainer);
        } finally {
            GuiInfo.writeLock.unlock();
        }
    }

    public static boolean hasCustomSlots(GuiContainer gui) {
        return customSlotGuis.contains(gui.getClass());
    }

    public static boolean hideItemPanelSlot(GuiContainer gui, Rectangle4i rect) {
        return hideItemPanelSlot(gui, rect, getGuiHandlersSnapshot());
    }

    public static INEIGuiHandler[] getGuiHandlersSnapshot() {
        try {
            readLock.lock();
            return guiHandlers.toArray(new INEIGuiHandler[0]);
        } finally {
            readLock.unlock();
        }
    }

    public static boolean hideItemPanelSlot(GuiContainer gui, Rectangle4i rect, INEIGuiHandler[] handlers) {
        for (INEIGuiHandler handler : handlers) {
            if (handler.hideItemPanelSlot(gui, rect.x, rect.y, rect.w, rect.h)) return true;
        }

        for (Object item : gui.buttonList) {
            GuiButton button = (GuiButton) item;

            if (button.xPosition + button.width > rect.x && button.xPosition < rect.x + rect.w
                    && button.yPosition + button.height > rect.y
                    && button.yPosition < rect.y + rect.h) {
                return true;
            }
        }

        return false;
    }
}