UIResolutionDropdown.cs

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using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;
using HKI.Core.Variables;
using TMPro;

namespace HKI.Core.UI.Settings
{
    [RequireComponent(typeof(TMP_Dropdown))]
    public class UIResolutionDropdown : MonoBehaviour
    {
        // Public variables
        [SerializeField] IntegerWidthHeight Resolution = null;

        // Private variables
        TMP_Dropdown dropdown = null;

        List<IntWidthHeight> resolutions = new List<IntWidthHeight>();

        // Awake function
        void Awake()
        {
            dropdown = GetComponent<TMP_Dropdown>();
        }

        // Start function
        void Start()
        {
            if(Resolution != null)
            {
                Resolution[] res = Screen.resolutions;
                for (int i = 0; i < res.Length; i++)
                {
                    if(resolutions.FindIndex(x => x.Width == res[i].width && x.Height == res[i].height) < 0)
                        resolutions.Add(new IntWidthHeight() { Width = res[i].width, Height = res[i].height });
                }

                List<TMP_Dropdown.OptionData> list = new List<TMP_Dropdown.OptionData>();
                int currentResolutionIndex = 0;
                Resolution currentResolution = Screen.currentResolution;
                for(int i = 0; i < resolutions.Count; i++)
                {
                    list.Add(new TMP_Dropdown.OptionData(resolutions[i].Width.ToString() + " x " + resolutions[i].Height.ToString()));

                    if (resolutions[i].Width == currentResolution.width && resolutions[i].Height == currentResolution.height)
                        currentResolutionIndex = i;
                }

                dropdown.ClearOptions();
                dropdown.AddOptions(list);

                dropdown.value = currentResolutionIndex;
            }
            else
                Debug.LogError("(UIResolutionDropdown) Resolution value is null!");
        }

        // Interface functions
        public void SetResolutionToDropdownValue()
        {
            if(Resolution != null)
                Resolution.SetValue = resolutions[dropdown.value];
        }

        public void Reset()
        {
            Resolution[] res = Screen.resolutions;
            for (int i = 0; i < res.Length; i++)
            {
                if (resolutions.FindIndex(x => x.Width == res[i].width && x.Height == res[i].height) < 0)
                    resolutions.Add(new IntWidthHeight() { Width = res[i].width, Height = res[i].height });
            }

            List<TMP_Dropdown.OptionData> list = new List<TMP_Dropdown.OptionData>();
            int currentResolutionIndex = 0;
            Resolution currentResolution = Screen.currentResolution;
            for (int i = 0; i < resolutions.Count; i++)
            {
                list.Add(new TMP_Dropdown.OptionData(resolutions[i].Width.ToString() + " x " + resolutions[i].Height.ToString()));

                if (resolutions[i].Width == currentResolution.width && resolutions[i].Height == currentResolution.height)
                    currentResolutionIndex = i;
            }

            dropdown.ClearOptions();
            dropdown.AddOptions(list);

            dropdown.value = currentResolutionIndex;
        }
    }
}