Panel

package Mrhand3.SOARYN.InventoryReg.gui;
import java.lang.ref.WeakReference;
import java.util.List;

import net.minecraft.client.Minecraft;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;

import org.lwjgl.opengl.GL11;

public class Panel extends Box
{
    private WeakReference<Container> container;

    public Panel(int x, int y, int width, int height, Container container)
    {
        super(x, y, width, height, 0, 5, 0xFFFFFF);
        this.container = new WeakReference<Container>(container);
    }

    @SuppressWarnings("unchecked")
    @Override
    public void render(Minecraft minecraft, int x, int y, int mouseX, int mouseY)
    {
        super.render(minecraft, x, y, mouseX, mouseY);

        if (Base.IS_OVERLAY_PASS != isOverlay())
        {
            return;
        }

        GL11.glColor4f(1, 1, 1, 1);
        bindComponentsSheet();

        if (container != null && container.get() != null)
        {
            for (Slot slot : (List<Slot>)container.get().inventorySlots)
            {
                drawTexturedModalRect(slot.xDisplayPosition - 1, slot.yDisplayPosition - 1, 0, 20, 18, 18);
            }
        }
    }
}