Add boolean input component

Author: pwelter34

src/Privileged.Components/PrivilegeInputBoolean.cs

@@ -0,0 +1,99 @@
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Rendering;
+
+namespace Privileged.Components;
+
+/// <summary>
+/// A custom input component for selecting boolean values (<c>bool</c> or <c>bool?</c>).
+/// </summary>
+/// <typeparam name="TValue">The type of the value bound to the input. Must be <c>bool</c> or <c>bool?</c>.</typeparam>
+public class PrivilegeInputBoolean<TValue> : PrivilegeInputSelect<TValue>
+{
+    /// <summary>
+    /// The label to display for the null option (only shown for <c>bool?</c>). Defaults to "- select -".
+    /// </summary>
+    [Parameter]
+    public string NullLabel { get; set; } = "- select -";
+
+    /// <summary>
+    /// The label to display for the true option. Defaults to "True".
+    /// </summary>
+    [Parameter]
+    public string TrueLabel { get; set; } = "True";
+
+    /// <summary>
+    /// The label to display for the false option. Defaults to "False".
+    /// </summary>
+    [Parameter]
+    public string FalseLabel { get; set; } = "False";
+
+    /// <summary>
+    /// Called when component parameters are set. Ensures only <c>bool</c> or <c>bool?</c> are allowed and sets the default child content.
+    /// </summary>
+    /// <exception cref="InvalidOperationException">Thrown if <typeparamref name="TValue"/> is not <c>bool</c> or <c>bool?</c>.</exception>
+    protected override void OnParametersSet()
+    {
+        base.OnParametersSet();
+
+        if (typeof(TValue) != typeof(bool) && typeof(TValue) != typeof(bool?))
+            throw new InvalidOperationException("Component only supports bool or bool? types.");
+
+        ChildContent ??= RenderBooleanOptions;
+    }
+
+    /// <summary>
+    /// Converts the value to a string for rendering in the select element.
+    /// </summary>
+    /// <param name="value">The value to format.</param>
+    /// <returns>
+    /// "true" or "false" for <c>bool</c> and <c>bool?</c> values, <c>null</c> for a null <c>bool?</c>, or the base implementation for other types.
+    /// </returns>
+    protected override string? FormatValueAsString(TValue? value)
+    {
+        if (typeof(TValue) == typeof(bool))
+        {
+            if (value is bool b)
+                return b ? "true" : "false";
+
+            return "false";
+        }
+        else if (typeof(TValue) == typeof(bool?))
+        {
+            if (value is null)
+                return null;
+
+            if (value is bool b)
+                return b ? "true" : "false";
+
+            return null;
+        }
+
+        return base.FormatValueAsString(value);
+    }
+
+    /// <summary>
+    /// Renders the boolean options for the select element.
+    /// Includes a null option for <c>bool?</c> types.
+    /// </summary>
+    /// <param name="builder">The <see cref="RenderTreeBuilder"/> used to build the options.</param>
+    protected void RenderBooleanOptions(RenderTreeBuilder builder)
+    {
+        if (typeof(TValue) == typeof(bool?))
+        {
+            builder.OpenElement(0, "option");
+            builder.AddAttribute(1, "value", "");
+            builder.AddContent(2, NullLabel);
+            builder.CloseElement();
+        }
+
+        builder.OpenElement(3, "option");
+        builder.AddAttribute(4, "value", "true");
+        builder.AddContent(5, TrueLabel);
+        builder.CloseElement();
+
+        builder.OpenElement(6, "option");
+        builder.AddAttribute(7, "value", "false");
+        builder.AddContent(8, FalseLabel);
+        builder.CloseElement();
+    }
+}