RiftMayhem/Assets/Scripts/UI/ExperienceBarUI.cs

using Kryz.CharacterStats.Examples;
using Photon.Pun;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public class ExperienceBarUI : MonoBehaviour
{
    [Header("Components:")]
    [SerializeField] private TMP_Text level;
    [SerializeField] private TMP_Text nextLevel;
    [SerializeField] private TMP_Text experienceBar;
    [SerializeField] private Image experienceBarFill;
    [Header("Listeners:")]
    [SerializeField] private GameEventListener_PhotonView onPlayerSpawned;

    PlayerCharacterStats player;

    float startingWidth;

    float currentFill;

    RectTransform rectFill;
    RectMask2D mask;

    Vector4 sizeFill = new Vector4();

    private void Awake()
    {
        onPlayerSpawned.Response.AddListener(DependancyInjection);

        rectFill = experienceBarFill.GetComponent<RectTransform>();
        mask = experienceBarFill.GetComponent<RectMask2D>();
        startingWidth = rectFill.rect.width;
    }

    private void DependancyInjection(PhotonView spawnedPlayer)
    {
        if (!spawnedPlayer.IsMine) return;

        player = ((RiftPlayer)spawnedPlayer.Owner.TagObject).GetComponent<PlayerCharacterStats>();
        player.level.OnLevelUpEvent.AddListener(UpdateLevelText);
        player.level.OnExperienceChanged.AddListener(UpdateLevelText);

        UpdateLevelText();


    }


    public void UpdateLevelText()
    {
        level.text = player.level.currentLevel.ToString();
        nextLevel.text = (player.level.currentLevel + 1).ToString();
        experienceBar.text = $"{player.level.GetCurrentExperience().ToString("F1")}/{player.level.FinalExperienceThreshold.ToString("F1")}";
        SetCurrentFill();
    }

    private void SetCurrentFill()
    {
        currentFill = player.level.GetCurrentExperience() / player.level.FinalExperienceThreshold;

        sizeFill.x = 0;
        sizeFill.y = 0;
        sizeFill.z = startingWidth - (currentFill * startingWidth);
        sizeFill.w = 0;

        mask.padding = sizeFill;
    }
}