Connected.Components/Components/BooleanInput.cs

using Connected.Annotations;
using Microsoft.AspNetCore.Components;

namespace Connected.Components;

public class BooleanInput<T> : FormComponent<T, bool?>
{
	public BooleanInput() : base(new BoolConverter<T>()) { }

	/// <summary>
	/// If true, the input will be disabled.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.FormComponent.Behavior)]
	public bool Disabled { get; set; }

	/// <summary>
	/// If true, the input will be read-only.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.FormComponent.Behavior)]
	public bool ReadOnly { get; set; }

	/// <summary>
	/// The state of the component
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.FormComponent.Data)]
	public T Checked
	{
		get => _value;
		set => _value = value;
	}

	/// <summary>
	/// If true will prevent the click from bubbling up the event tree.
	/// </summary>
	[Parameter]
	[Category(CategoryTypes.FormComponent.Behavior)]
	public bool StopClickPropagation { get; set; } = true;

	/// <summary>
	/// Fired when Checked changes.
	/// </summary>
	[Parameter] public EventCallback<T> CheckedChanged { get; set; }

	protected bool? BoolValue => Converter.Convert(Checked);

	protected virtual Task OnChange(ChangeEventArgs args)
	{
		Modified = true;
		return SetBoolValueAsync((bool?)args.Value);
	}

	protected Task SetBoolValueAsync(bool? value)
	{
		return SetCheckedAsync(Converter.ConvertBack(value));
	}

	protected async Task SetCheckedAsync(T value)
	{
		if (Disabled)
			return;
		if (!EqualityComparer<T>.Default.Equals(Checked, value))
		{
			Checked = value;
			await CheckedChanged.InvokeAsync(value);
			BeginValidate();
			FieldChanged(Checked);
		}
	}

	protected override bool SetConverter(Converter<T, bool?> value)
	{
		var changed = base.SetConverter(value);
		if (changed)
			SetBoolValueAsync(Converter.Convert(Checked)).AndForget();

		return changed;
	}

	/// <summary>
	/// A value is required, so if not checked we return ERROR.
	/// </summary>
	protected override bool HasValue(T value)
	{
		return (BoolValue == true);
	}
}