In my mod if a player is new to a world (first join of that player in a world) a GUI appear, let him choose a class. The problem is that the player can close this GUI and don't select a class, wich is something i want to avoid (so every player must have his class). This is the GUI class i use

package com.rpg.gui;

import java.io.IOException;

import com.rpg.messages.PlayerClassMessage;
import com.rpg.player.PlayerProperties;
import com.rpg.utils.PlayerClasses;

import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.GuiScreen;
import scala.swing.event.KeyPressed;

public class GuiClassSelection extends GuiScreen{

private GuiButton tank;
private GuiButton archer;
private GuiButton assassin;
private GuiButton support;

public GuiClassSelection() {
}

@Override
public void drawScreen(int mouseX, int mouseY, float partialTicks) {
	this.drawDefaultBackground();
	super.drawScreen(mouseX, mouseY, partialTicks);
}

@Override
public boolean doesGuiPauseGame() {
	return false;
}

@Override
public void initGui() {
	tank = new GuiButton(0, this.width / 2 - 100, this.height / 2 - 54, "Tank");
	archer = new GuiButton(0, this.width / 2 - 100, this.height / 2 - 24, "Archer");
	assassin = new GuiButton(0, this.width / 2 - 100, this.height / 2 + 24, "Assassin");
	support = new GuiButton(0, this.width / 2 - 100, this.height / 2 + 54, "Support");

	this.buttonList.add(tank);
	this.buttonList.add(archer);
	this.buttonList.add(assassin);
	this.buttonList.add(support);
}

@Override
protected void actionPerformed(GuiButton button) throws IOException {
	PlayerProperties props = PlayerProperties.get(this.mc.thePlayer);
	int pClass = PlayerClasses.TANK.ordinal();
	if(button == this.tank) {
		pClass = PlayerClasses.TANK.ordinal();
	}
	if(button == this.archer) {
		pClass = PlayerClasses.ARCHER.ordinal();
	}
	if(button == this.assassin) {
		pClass = PlayerClasses.ASSASSIN.ordinal();
	}
	if(button == this.support) {
		pClass = PlayerClasses.SUPPORT.ordinal();
	}

	props.sendToServer(new PlayerClassMessage(pClass));

	this.mc.displayGuiScreen(null);
	if(this.mc.currentScreen == null)
		this.mc.setIngameFocus();
}

}

 

How can i make it unclosable (so the player can't close this GUI until a class is selected)?

There are several ways to do that. If you only want to block the 'Esc' key, override the #keyTyped method and make it do nothing.

Or if you want to block every closing, reopen the gui on #onGuiClosed when the appropriate condition is not met.

Thanks for the answer, overriding the keyTyped method has solved the problem