You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gui.rs
    path of file: ./repos/rustrogueliketutorial/chapter-68-mushrooms/src
    
    the code of the file until where you have to start completion: use rltk::{ RGB, Rltk, Point, VirtualKeyCode };
use specs::prelude::*;
use super::{Pools, gamelog::GameLog, Map, Name, State, InBackpack,
    Viewshed, RunState, Equipped, HungerClock, HungerState, rex_assets::RexAssets,
    Hidden, camera, Attributes, Attribute, Consumable, VendorMode, Item, Vendor,
    MagicItem, MagicItemClass, ObfuscatedName, CursedItem, MasterDungeonMap,
    StatusEffect, Duration, KnownSpells };

pub fn get_item_color(ecs : &World, item : Entity) -> RGB {
  
    
    fn height(&self) -> i32 { self.lines.len() as i32 + 2i32 }

    fn render(&self, ctx : &mut Rltk, x : i32, y : i32) {
        let box_gray : RGB = RGB::from_hex("#999999").expect("Oops");
        let light_gray : RGB = RGB::from_hex("#DDDDDD").expect("Oops");
        let white = RGB::named(rltk::WHITE);
        let black = RGB::named(rltk::BLACK);
        ctx.draw_box(x, y, self.width()-1, self.height()-1, white, box_gray);
        for (i,s) in self.lines.iter().enumerate() {
            let col = if i == 0 { white } else { light_gray };
            ctx.print_color(x+1, y+i as i32+1, col, black, &s);
        }
    }
}