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: player.rs
    path of file: ./repos/rustrogueliketutorial/chapter-20-magicmapping/src
    
    the code of the file until where you have to start completion: use rltk::{VirtualKeyCode, Rltk, Point};
use specs::prelude::*;
use std::cmp::{max, min};
use super::{Position, Player, Viewshed, State, Map, RunState, CombatStats, WantsToMelee, Item,
    gamelog::GameLog, WantsToPickupItem, TileType, Monster, HungerClock, HungerState};

pub fn try_move_player(delta_x: i32, delta_y: i32
    
pub fn try_next_level(ecs: &mut World) -> bool {
    let player_pos = ecs.fetch::<Point>();
    let map = ecs.fetch::<Map>();
    let player_idx = map.xy_idx(player_pos.x, player_pos.y);
    if map.tiles[player_idx] == TileType::DownStairs {
        true
    } else {
        let mut gamelog = ecs.fetch_mut::<GameLog>();
        gamelog.entries.push("There is no way down from here.".to_string());
        false
    }
}