minecraft-kajetans-mod/src/main/java/me/km/inventory/CustomContainer.java

package me.km.inventory;

import me.km.KajetansMod;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.inventory.ClickType;
import net.minecraft.item.ItemStack;

public class CustomContainer extends CustomContainerBase
{
    private boolean canBeClosed;
    
    public CustomContainer(InventoryBase inv, EntityPlayer p) 
    {
        super(inv, p);
        canBeClosed = true;
    }
    
    @Override
    public void closeSafe()
    {
        if(canBeClosed)
        {
            super.closeSafe();
        }
        else if(isServerSide)
        {
            KajetansMod.scheduler.scheduleTask(() -> 
            {
                if(viewer.openContainer.windowId == this.windowId)
                {
                    super.closeSafe();
                }
            });
        }
    }
    
    @Override
    public void openForPlayer()
    {
        // opening container on next tick to prevent closing during noClicking or onCanceledClick
        if(isServerSide)
        {
            if(viewer.openContainer instanceof CustomContainer)
            {
                CustomContainer cc = (CustomContainer) viewer.openContainer;
                if(!cc.canBeClosed)
                {
                    KajetansMod.scheduler.scheduleTask(() -> openForPlayer());
                    return;
                }
            }
            super.openForPlayer();
        }
    }
    
    @Override
    public final ItemStack slotClick(int slotId, int dragType, ClickType clickTypeIn, EntityPlayer p) 
    {
        if(slotId < 0 || slotId >= inv.getSizeInventory())
        {
            return super.slotClick(slotId, dragType, clickTypeIn, p);
        }
        switch(inv.getSlotStatus(slotId))
        {
            case 0: return ItemStack.EMPTY;
            case 1: return super.slotClick(slotId, dragType, clickTypeIn, p);
            case 2: 
                if(isServerSide)
                {
                    //System.out.println("Button was pressed");
                    EntityPlayerMP player = (EntityPlayerMP) p;
                    canBeClosed = false;
                    onButtonClick(slotId, dragType, clickTypeIn, player);
                    canBeClosed = true;
                }
                return ItemStack.EMPTY;
            case 3:
                if(isServerSide)
                {
                    //System.out.println("Button was pressed, serverside cancel possible");
                    EntityPlayerMP player = (EntityPlayerMP) p;
                    canBeClosed = false;
                    if(onButtonClick(slotId, dragType, clickTypeIn, player))
                    {
                        canBeClosed = true;
                        return ItemStack.EMPTY;
                    }
                    canBeClosed = true;
                }
                return super.slotClick(slotId, dragType, clickTypeIn, p);
        }
        return ItemStack.EMPTY;
    }  
    
    public boolean onButtonClick(int slotId, int dragType, ClickType clickTypeIn, EntityPlayerMP player)
    {
        return false;
    }
}