I have a GUI with a textbox. What i want is that pressing tab will loop through all the usernames of players in the world. I've looked into command block GUI and see how it's tab completer works but editing that didn't worked. So how can i add this tab completer inside my GUI?

This is the GUI code i'm using where i want to put the tab completer

 
	package com.cf.gui;
	import java.io.IOException;
import java.util.List;
import java.util.UUID;
	import javax.annotation.Nullable;
	import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.GL11;
	import com.cf.CoreFaction;
import com.cf.capabilities.world.FactionCapabilitiesProvider;
import com.cf.capabilities.world.IFactionCapabilities;
import com.cf.messages.FactionCapabilitiesMessage;
import com.cf.utils.Utils;
	import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.client.gui.GuiTextField;
import net.minecraft.client.resources.I18n;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.TabCompleter;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.text.TextComponentString;
import net.minecraft.util.text.TextFormatting;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.FMLCommonHandler;
	public class GuiFactionHandling extends GuiScreen {
	    private static final ResourceLocation BG = new ResourceLocation(CoreFaction.MODID, "textures/gui/scroll.png");
	    private GuiButton inviteBtn;
    private GuiButton kickBtn;
    private GuiButton cancelBtn;
    
    private GuiTextField nameTextField;
    private GuiTextField kickTextField;
    private TabCompleter tabCompleter;
	    public void updateScreen()
    {
        this.nameTextField.updateCursorCounter();
        this.kickTextField.updateCursorCounter();
        if(nameTextField.getText().trim().length() <= 0)
            this.inviteBtn.enabled = false;
        else
            this.inviteBtn.enabled = true;
        
        if(kickTextField.getText().trim().length() <= 0)
            this.kickBtn.enabled = false;
        else
            this.kickBtn.enabled = true;
    }
    
    public void initGui() {
        int xPos = (this.width - 256) / 2;
        int yPos = (this.height - 256) / 2;
        this.buttonList.clear();
	        this.inviteBtn = this.addButton(
                new GuiButton(0, xPos + 53, yPos + 50, 150, 20, Utils.getTranslation("gui.handling.invite")));
        
	        this.kickBtn = this.addButton(
                new GuiButton(1, xPos + 53, yPos + 100, 150, 20, Utils.getTranslation("gui.handling.kick")));
	        this.cancelBtn = this.addButton(
                new GuiButton(2, xPos + 53, yPos + 150, 150, 20, Utils.getTranslation("gui.handling.cancel")));
        
        Keyboard.enableRepeatEvents(true);
        this.nameTextField = new GuiTextField(3, this.fontRendererObj, xPos + 53, yPos + 70, 150, 20);
        this.nameTextField.setMaxStringLength(32500);
        this.nameTextField.setFocused(true);
        
        this.kickTextField = new GuiTextField(4, this.fontRendererObj, xPos + 53, yPos + 120, 150, 20);
        this.kickTextField.setMaxStringLength(32500);
        this.kickTextField.setFocused(false);
        
        this.tabCompleter = new TabCompleter(this.nameTextField, false)
        {
            @Nullable
            public BlockPos getTargetBlockPos()
            {
                return null;
            }
        };
    }
	    public void onGuiClosed()
    {
        Keyboard.enableRepeatEvents(false);
    }
    
    protected void keyTyped(char typedChar, int keyCode) throws IOException
    {
        this.tabCompleter.resetRequested();
	        if (keyCode == 15)
        {
            this.tabCompleter.complete();
        }
        else
        {
            this.tabCompleter.resetDidComplete();
        }
        
        this.nameTextField.textboxKeyTyped(typedChar, keyCode);
        this.kickTextField.textboxKeyTyped(typedChar, keyCode);
	        if (keyCode != 28 && keyCode != 156)
        {
            if (keyCode == 1)
            {
                this.actionPerformed(cancelBtn);
            }
        }
        else {
            if(this.nameTextField.isFocused())
                this.actionPerformed(inviteBtn);
            else if(this.kickTextField.isFocused())
                this.actionPerformed(kickBtn);
        }
            
    }
	    protected void mouseClicked(int mouseX, int mouseY, int mouseButton) throws IOException
    {
        super.mouseClicked(mouseX, mouseY, mouseButton);
        this.nameTextField.mouseClicked(mouseX, mouseY, mouseButton);
        this.kickTextField.mouseClicked(mouseX, mouseY, mouseButton);
    }
    
    @Override
    public boolean doesGuiPauseGame() {
        return false;
    }
    
    @Override
    protected void actionPerformed(GuiButton button) throws IOException {
        if (button.enabled) {
            World world = this.mc.theWorld;
            EntityPlayer player = this.mc.thePlayer;
            if (button.id == 0) {
                IFactionCapabilities cap = world.getCapability(FactionCapabilitiesProvider.FACTION_CAP, null);
	                EntityPlayerMP inv = FMLCommonHandler.instance().getMinecraftServerInstance().getPlayerList().getPlayerByUsername(this.nameTextField.getText());
                if(inv != null) {
                    if(cap.getFaction(inv.getUniqueID()) == null) {
                        cap.getFaction(player.getUniqueID()).addPlayer(inv.getUniqueID());
                        CoreFaction.NETWORK.sendToServer(new FactionCapabilitiesMessage(cap.getFaction(player.getUniqueID())));
                        CoreFaction.NETWORK.sendTo(new FactionCapabilitiesMessage(cap.getFaction(player.getUniqueID())), inv);
                        this.actionPerformed(cancelBtn);
                    } else {
                        this.actionPerformed(cancelBtn);
                        Utils.sendMessage(player, TextFormatting.RED + Utils.getTranslation("faction.invite.already"));
                    }
                } else {
                    this.actionPerformed(cancelBtn);
                    Utils.sendMessage(player, TextFormatting.RED + Utils.getTranslation("faction.invite.notfound"));
                }
	            } else if (button.id == 1) {
                IFactionCapabilities cap = world.getCapability(FactionCapabilitiesProvider.FACTION_CAP, null);
	                EntityPlayerMP inv = FMLCommonHandler.instance().getMinecraftServerInstance().getPlayerList().getPlayerByUsername(this.nameTextField.getText());
                if(inv != null) {
                    if(cap.getFaction(inv.getUniqueID()) == cap.getFaction(player.getUniqueID())) {
                        cap.getFaction(player.getUniqueID()).removePlayer(inv.getUniqueID());
                        CoreFaction.NETWORK.sendToServer(new FactionCapabilitiesMessage(cap.getFaction(player.getUniqueID())));
                        CoreFaction.NETWORK.sendTo(new FactionCapabilitiesMessage(cap.getFaction(player.getUniqueID())), inv);
                        this.actionPerformed(cancelBtn);
                    } else {
                        this.actionPerformed(cancelBtn);
                        Utils.sendMessage(player, TextFormatting.RED + Utils.getTranslation("faction.kick.nofaction"));
                    }
                } else {
                    this.actionPerformed(cancelBtn);
                    Utils.sendMessage(player, TextFormatting.RED + Utils.getTranslation("faction.invite.notfound"));
                }
            } else if (button.id == 2) {
                this.mc.displayGuiScreen((GuiScreen) null);
            }
        }
    }
	    @Override
    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
        World world = this.mc.theWorld;
        EntityPlayer player = this.mc.thePlayer;
        int xPos = (this.width - 256) / 2;
        int yPos = (this.height - 256) / 2;
        GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
        GL11.glDisable(GL11.GL_LIGHTING);
        this.mc.getTextureManager().bindTexture(this.BG);
        this.drawTexturedModalRect(xPos, yPos, 0, 0, 256, 256);
	        IFactionCapabilities capabilities = world
                .getCapability(FactionCapabilitiesProvider.FACTION_CAP, null);
	        this.drawString(fontRendererObj,
                Utils.getTranslation("gui.handling.faction")+ " " + capabilities.getFaction(player.getUniqueID()).getName(),
                xPos + 53, yPos + 27, 0xFFFFE6);
        this.nameTextField.drawTextBox();
        this.kickTextField.drawTextBox();
        
        super.drawScreen(mouseX, mouseY, partialTicks);
    }
    
    public void setCompletions(String... newCompletions)
    {
        this.tabCompleter.setCompletions(FMLCommonHandler.instance().getMinecraftServerInstance().getAllUsernames());
    }
}

Edited May 4, 20178 yr by diesieben07
syntax highlighting