CategoryAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.All)]
public class CategoryAttribute : Attribute
{
    private static volatile CategoryAttribute s_action;
 
    private static volatile CategoryAttribute s_appearance;
 
    private static volatile CategoryAttribute s_asynchronous;
 
    private static volatile CategoryAttribute s_behavior;
 
    private static volatile CategoryAttribute s_data;
 
    private static volatile CategoryAttribute s_design;
 
    private static volatile CategoryAttribute s_dragDrop;
 
    private static volatile CategoryAttribute s_defAttr;
 
    private static volatile CategoryAttribute s_focus;
 
    private static volatile CategoryAttribute s_format;
 
    private static volatile CategoryAttribute s_key;
 
    private static volatile CategoryAttribute s_layout;
 
    private static volatile CategoryAttribute s_mouse;
 
    private static volatile CategoryAttribute s_windowStyle;
 
    private bool _localized;
 
    private readonly object _locker = new object();
 
    private string _categoryValue;
 
    public static CategoryAttribute Action => s_action ?? (s_action = new CategoryAttribute("Action"));
 
    public static CategoryAttribute Appearance => s_appearance ?? (s_appearance = new CategoryAttribute("Appearance"));
 
    public static CategoryAttribute Asynchronous => s_asynchronous ?? (s_asynchronous = new CategoryAttribute("Asynchronous"));
 
    public static CategoryAttribute Behavior => s_behavior ?? (s_behavior = new CategoryAttribute("Behavior"));
 
    public static CategoryAttribute Data => s_data ?? (s_data = new CategoryAttribute("Data"));
 
    public static CategoryAttribute Default => s_defAttr ?? (s_defAttr = new CategoryAttribute());
 
    public static CategoryAttribute Design => s_design ?? (s_design = new CategoryAttribute("Design"));
 
    public static CategoryAttribute DragDrop => s_dragDrop ?? (s_dragDrop = new CategoryAttribute("DragDrop"));
 
    public static CategoryAttribute Focus => s_focus ?? (s_focus = new CategoryAttribute("Focus"));
 
    public static CategoryAttribute Format => s_format ?? (s_format = new CategoryAttribute("Format"));
 
    public static CategoryAttribute Key => s_key ?? (s_key = new CategoryAttribute("Key"));
 
    public static CategoryAttribute Layout => s_layout ?? (s_layout = new CategoryAttribute("Layout"));
 
    public static CategoryAttribute Mouse => s_mouse ?? (s_mouse = new CategoryAttribute("Mouse"));
 
    public static CategoryAttribute WindowStyle => s_windowStyle ?? (s_windowStyle = new CategoryAttribute("WindowStyle"));
 
    public string Category
    {
        get
        {
            if (!_localized)
            {
                lock (_locker)
                {
                    string localizedString = GetLocalizedString(_categoryValue);
                    if (localizedString != null)
                    {
                        _categoryValue = localizedString;
                    }
                    _localized = true;
                }
            }
            return _categoryValue;
        }
    }
 
    public CategoryAttribute()
        : this("Default")
    {
    }
 
    public CategoryAttribute(string category)
    {
        _categoryValue = category;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj is CategoryAttribute categoryAttribute)
        {
            return categoryAttribute.Category == Category;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return Category?.GetHashCode() ?? 0;
    }
 
    protected virtual string? GetLocalizedString(string value)
    {
        return value switch
        {
            "Action" => System.SR.PropertyCategoryAction, 
            "Appearance" => System.SR.PropertyCategoryAppearance, 
            "Asynchronous" => System.SR.PropertyCategoryAsynchronous, 
            "Behavior" => System.SR.PropertyCategoryBehavior, 
            "Config" => System.SR.PropertyCategoryConfig, 
            "Data" => System.SR.PropertyCategoryData, 
            "DDE" => System.SR.PropertyCategoryDDE, 
            "Default" => System.SR.PropertyCategoryDefault, 
            "Design" => System.SR.PropertyCategoryDesign, 
            "DragDrop" => System.SR.PropertyCategoryDragDrop, 
            "Focus" => System.SR.PropertyCategoryFocus, 
            "Font" => System.SR.PropertyCategoryFont, 
            "Format" => System.SR.PropertyCategoryFormat, 
            "Key" => System.SR.PropertyCategoryKey, 
            "Layout" => System.SR.PropertyCategoryLayout, 
            "List" => System.SR.PropertyCategoryList, 
            "Mouse" => System.SR.PropertyCategoryMouse, 
            "Position" => System.SR.PropertyCategoryPosition, 
            "Scale" => System.SR.PropertyCategoryScale, 
            "Text" => System.SR.PropertyCategoryText, 
            "WindowStyle" => System.SR.PropertyCategoryWindowStyle, 
            _ => null, 
        };
    }
 
    public override bool IsDefaultAttribute()
    {
        return Category == Default.Category;
    }
}