XRLib/Assets/Scripts/UVC/UIToolkit/Label/UTKLabel.cs

#nullable enable
using System;
using UnityEngine;
using UnityEngine.UIElements;

namespace UVC.UIToolkit
{
    /// <summary>
    /// 텍스트 라벨 컴포넌트.
    /// 다양한 스타일과 크기의 텍스트를 표시합니다.
    /// </summary>
    [UxmlElement]
    public partial class UTKLabel : VisualElement, IDisposable
    {
        #region Constants
        private const string USS_PATH = "UIToolkit/Label/UTKLabel";
        #endregion

        #region Fields
        private bool _disposed;
        private Label? _label;

        private string _text = "";
        private LabelSize _size = LabelSize.Body1;
        private LabelVariant _variant = LabelVariant.Primary;
        private bool _isBold;
        private bool _isItalic;
        private TextAlign _textAlign = TextAlign.Left;
        private bool _isSelectable;
        #endregion

        #region Properties
        /// <summary>텍스트</summary>
        [UxmlAttribute]
        public string Text
        {
            get => _text;
            set
            {
                _text = value;
                if (_label != null) _label.text = value;
            }
        }

        /// <summary>텍스트 크기</summary>
        [UxmlAttribute]
        public LabelSize Size
        {
            get => _size;
            set
            {
                _size = value;
                UpdateSize();
            }
        }

        /// <summary>텍스트 변형</summary>
        [UxmlAttribute]
        public LabelVariant Variant
        {
            get => _variant;
            set
            {
                _variant = value;
                UpdateVariant();
            }
        }

        /// <summary>굵은 글꼴</summary>
        [UxmlAttribute]
        public bool IsBold
        {
            get => _isBold;
            set
            {
                _isBold = value;
                EnableInClassList("utk-label--bold", value);
            }
        }

        /// <summary>기울임 글꼴</summary>
        [UxmlAttribute]
        public bool IsItalic
        {
            get => _isItalic;
            set
            {
                _isItalic = value;
                EnableInClassList("utk-label--italic", value);
            }
        }

        /// <summary>텍스트 정렬</summary>
        [UxmlAttribute]
        public TextAlign TextAlignment
        {
            get => _textAlign;
            set
            {
                _textAlign = value;
                UpdateTextAlign();
            }
        }

        /// <summary>텍스트 선택 가능 여부</summary>
        [UxmlAttribute]
        public bool IsSelectable
        {
            get => _isSelectable;
            set
            {
                _isSelectable = value;
                if (_label != null)
                {
                    _label.selection.isSelectable = value;
                }
            }
        }
        #endregion

        #region Enums
        public enum LabelSize
        {
            H1,
            H2,
            H3,
            Body1,
            Body2,
            Label1,
            Label2,
            Label3,
            Caption
        }

        public enum LabelVariant
        {
            Primary,
            Secondary,
            Disabled,
            Success,
            Warning,
            Error,
            Info
        }

        public enum TextAlign
        {
            Left,
            Center,
            Right
        }
        #endregion

        #region Constructor
        public UTKLabel()
        {
            UTKThemeManager.Instance.ApplyThemeToElement(this);

            var uss = Resources.Load<StyleSheet>(USS_PATH);
            if (uss != null)
            {
                styleSheets.Add(uss);
            }

            CreateUI();
            SubscribeToThemeChanges();
        }

        public UTKLabel(string text, LabelSize size = LabelSize.Body1) : this()
        {
            Text = text;
            Size = size;
        }
        #endregion

        #region UI Creation
        private void CreateUI()
        {
            AddToClassList("utk-label");

            _label = new Label { name = "label" };
            _label.AddToClassList("utk-label__text");
            Add(_label);

            UpdateSize();
            UpdateVariant();
            UpdateTextAlign();
        }

        private void SubscribeToThemeChanges()
        {
            UTKThemeManager.Instance.OnThemeChanged += OnThemeChanged;
            RegisterCallback<DetachFromPanelEvent>(_ =>
            {
                UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
            });
        }

        private void OnThemeChanged(UTKTheme theme)
        {
            UTKThemeManager.Instance.ApplyThemeToElement(this);
        }
        #endregion

        #region Update Methods
        private void UpdateSize()
        {
            RemoveFromClassList("utk-label--h1");
            RemoveFromClassList("utk-label--h2");
            RemoveFromClassList("utk-label--h3");
            RemoveFromClassList("utk-label--body1");
            RemoveFromClassList("utk-label--body2");
            RemoveFromClassList("utk-label--label1");
            RemoveFromClassList("utk-label--label2");
            RemoveFromClassList("utk-label--label3");
            RemoveFromClassList("utk-label--caption");

            var sizeClass = _size switch
            {
                LabelSize.H1 => "utk-label--h1",
                LabelSize.H2 => "utk-label--h2",
                LabelSize.H3 => "utk-label--h3",
                LabelSize.Body2 => "utk-label--body2",
                LabelSize.Label1 => "utk-label--label1",
                LabelSize.Label2 => "utk-label--label2",
                LabelSize.Label3 => "utk-label--label3",
                LabelSize.Caption => "utk-label--caption",
                _ => "utk-label--body1"
            };
            AddToClassList(sizeClass);
        }

        private void UpdateVariant()
        {
            RemoveFromClassList("utk-label--primary");
            RemoveFromClassList("utk-label--secondary");
            RemoveFromClassList("utk-label--disabled");
            RemoveFromClassList("utk-label--success");
            RemoveFromClassList("utk-label--warning");
            RemoveFromClassList("utk-label--error");
            RemoveFromClassList("utk-label--info");

            var variantClass = _variant switch
            {
                LabelVariant.Secondary => "utk-label--secondary",
                LabelVariant.Disabled => "utk-label--disabled",
                LabelVariant.Success => "utk-label--success",
                LabelVariant.Warning => "utk-label--warning",
                LabelVariant.Error => "utk-label--error",
                LabelVariant.Info => "utk-label--info",
                _ => "utk-label--primary"
            };
            AddToClassList(variantClass);
        }

        private void UpdateTextAlign()
        {
            RemoveFromClassList("utk-label--left");
            RemoveFromClassList("utk-label--center");
            RemoveFromClassList("utk-label--right");

            var alignClass = _textAlign switch
            {
                TextAlign.Center => "utk-label--center",
                TextAlign.Right => "utk-label--right",
                _ => "utk-label--left"
            };
            AddToClassList(alignClass);
        }
        #endregion

        #region IDisposable
        public void Dispose()
        {
            if (_disposed) return;
            _disposed = true;

            UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
        }
        #endregion
    }
}