ModGuiScreen.java

package com.yolp900.itsjustacharm.client.guis;

import com.yolp900.itsjustacharm.reference.LibGuis;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.util.ResourceLocation;

public abstract class ModGuiScreen extends GuiScreen {

	int left, top;
	private final int guiWidth, guiHeight;
	private ResourceLocation texture;
	LibGuis gui;

	public ModGuiScreen(LibGuis gui, int width, int height) {
		this.gui = gui;
		this.texture = gui.getBackground();

		this.guiWidth = width;
		this.guiHeight = height;
	}

	@Override
	public void initGui() {
		left = width / 2 - guiWidth / 2;
		top = height / 2 - guiHeight / 2;
	}

	@Override
	public void drawScreen(int par1, int par2, float par3) {
		mc.renderEngine.bindTexture(texture);
		GlStateManager.color(1F, 1F, 1F, 1F);
		drawTexturedModalRect(left, top, 0, 0, guiWidth, guiHeight);

		onDrawScreen(par1, par2, par3);
	}

	abstract void onDrawScreen(int par1, int par2, float par3);

	@Override
	public abstract boolean doesGuiPauseGame();
}