Setup Project

src/main/java/me/lucaslah/ncrb/IScreen.java

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+package me.lucaslah.ncrb;
+
+import java.util.List;
+
+import net.minecraft.client.gui.Drawable;
+
+public interface IScreen {
+    public List<Drawable> getButtons();
+}

src/main/java/me/lucaslah/ncrb/NoReportButton.java

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+package me.lucaslah.ncrb;
+
+import net.fabricmc.api.ModInitializer;
+
+public class NoReportButton implements ModInitializer {
+    @Override
+    public void onInitialize() {
+        // Do nothing
+    }
+}

src/main/java/me/lucaslah/ncrb/mixin/GameMenuScreenMixin.java

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+package me.lucaslah.ncrb.mixin;
+
+import me.lucaslah.ncrb.IScreen;
+import net.minecraft.client.gui.Drawable;
+import net.minecraft.client.gui.screen.*;
+import net.minecraft.client.gui.widget.ButtonWidget;
+import net.minecraft.client.gui.widget.ClickableWidget;
+import net.minecraft.client.resource.language.I18n;
+import net.minecraft.text.Text;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(GameMenuScreen.class)
+public abstract class GameMenuScreenMixin extends Screen {
+
+	protected GameMenuScreenMixin(Text title) {
+		super(title);
+	}
+
+	@Inject(method = "initWidgets()V", at = @At(value = "RETURN"))
+	public void initWidgets(CallbackInfo ci) {
+		ClickableWidget reportButton = null;
+		boolean reportButtonFound = false;
+
+		for (Drawable drawable : ((IScreen) this).getButtons()) {
+			if (!(drawable instanceof ClickableWidget)) continue;
+
+			ClickableWidget button = (ClickableWidget) drawable;
+
+			if (!button.getMessage().getString().equals(I18n.translate("menu.playerReporting"))) continue;
+
+			reportButton = button;
+			reportButtonFound = true;
+			break;
+		}
+
+		if (reportButtonFound) {
+			reportButton.visible = false;
+
+			ButtonWidget openToLanButton = this.addDrawableChild(new ButtonWidget(this.width / 2 + 4, this.height / 4 + 96 + -16, 98, 20, Text.translatable("menu.shareToLan"), (button) -> {
+				this.client.setScreen(new OpenToLanScreen(this));
+			}));
+
+			openToLanButton.active = this.client.isIntegratedServerRunning() && !this.client.getServer().isRemote();
+		}
+	}
+}

src/main/java/me/lucaslah/ncrb/mixin/ScreenMixin.java

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+package me.lucaslah.ncrb.mixin;
+
+import me.lucaslah.ncrb.IScreen;
+import net.minecraft.client.gui.AbstractParentElement;
+import net.minecraft.client.gui.Drawable;
+import net.minecraft.client.gui.screen.Screen;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+import java.util.List;
+
+@Mixin(Screen.class)
+public abstract class ScreenMixin extends AbstractParentElement implements Drawable, IScreen {
+    @Shadow
+    @Final
+    private List<Drawable> drawables;
+
+    @Override
+    public List<Drawable> getButtons() {
+        return drawables;
+    }
+}