UIGameSettings.cs

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;

namespace Unity.Megacity.UI
{
    /// <summary>
    /// Allows game settings to navigate through game setting views.
    /// Shows and hides view according to the game settings menu.
    /// </summary>
    public class UIGameSettings : MonoBehaviour
    {
        [SerializeField] private UISettingsTab[] m_TabViews;
        private int m_CurrentView;

        private Button m_GraphicsButton;
        private Button m_AudioButton;
        private Button m_CloseButton;
        private Button m_ApplyButton;
        private Button m_ControlsButton;
        
        private VisualElement m_GameSettings;
        private VisualElement m_TriggerSettings;
        private List<VisualElement> m_ViewSettingsList = new();
        private List<Button> m_TabButtons = new();
        private const string SELECTED_CLASS = "button-menu-active";

        public bool IsVisible => m_GameSettings.style.display == DisplayStyle.Flex;

        private void OnEnable()
        {
            var root = GetComponent<UIDocument>().rootVisualElement;
            m_GameSettings = root.Q<VisualElement>("game-settings");

            foreach (var view in m_TabViews)
            {
                view.GameSettingsView = root.Q<VisualElement>(view.TabName);
                m_ViewSettingsList.Add(view.GameSettingsView);
            }

            root.Q<VisualElement>("settings-background");
            m_GraphicsButton = root.Q<Button>("graphics-button");
            m_AudioButton = root.Q<Button>("audio-button");
            m_ControlsButton = root.Q<Button>("controls-button");
            m_CloseButton = root.Q<Button>("close-button");
            m_ApplyButton = root.Q<Button>("apply-button");

            m_TabButtons.Add(m_GraphicsButton);
            m_TabButtons.Add(m_AudioButton);
            m_TabButtons.Add(m_ControlsButton);

            m_GraphicsButton.clicked += () => 
            { 
                m_CurrentView = 0;
                ShowSettings();
            };

            m_AudioButton.clicked += () =>
            {
                m_CurrentView = 1;
                ShowSettings();
            };
           
            m_ControlsButton.clicked += () =>
            {
                m_CurrentView = 2;
                ShowSettings();
            };

            m_CloseButton.clicked += () =>
            {
                Reset();
                Hide();
            };

            m_ApplyButton.clicked += () =>
            {
                Apply();
                Hide();
            };

            Hide();
            
#if UNITY_ANDROID || UNITY_IPHONE
            var hideInMobileElements = root.Query(className: "hide-in-mobile").ToList();
            foreach (var mobileElement in hideInMobileElements)
            {
                mobileElement.style.display = DisplayStyle.None;
            }
#endif
        }

        public void Show(VisualElement caller = null)
        {
            if (caller != null)
            {
                caller.style.display = DisplayStyle.None;
                m_TriggerSettings = caller;
            }

            m_GameSettings.style.display = DisplayStyle.Flex;
            ShowSettings();
        }

        public void Hide()
        {
            if (m_TriggerSettings != null)
            {
                m_TriggerSettings.style.display = DisplayStyle.Flex;
                m_TriggerSettings = null;
            }

            m_GameSettings.style.display = DisplayStyle.None;
            m_CurrentView = 0;
        }

        private void ShowSettings()
        {
            m_ViewSettingsList.ForEach(element => element.style.display = DisplayStyle.None);
            m_ViewSettingsList[m_CurrentView].style.display = DisplayStyle.Flex;
            foreach (var tab in m_TabViews)
            {
                tab.Hide();
            }

            m_TabViews[m_CurrentView].Show();
            m_TabButtons.ForEach(b => b.RemoveFromClassList(SELECTED_CLASS));
            m_TabButtons[m_CurrentView].AddToClassList(SELECTED_CLASS);
        }

        private void Reset()
        {
            m_TabViews[m_CurrentView].Reset();
        }

        private void Apply()
        {
            m_TabViews[m_CurrentView].Apply();
        }
    }
}