// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics.CodeAnalysis;
using static Microsoft.AspNetCore.Internal.LinkerFlags;
 
namespace Microsoft.AspNetCore.Components;
 
/// <summary>
/// Optional base class for components that represent a layout.
/// Alternatively, components may implement <see cref="IComponent"/> directly
/// and declare their own parameter named <see cref="Body"/>.
/// </summary>
public abstract class LayoutComponentBase : ComponentBase
{
    internal const string BodyPropertyName = nameof(Body);
 
    /// <summary>
    /// Gets the content to be rendered inside the layout.
    /// </summary>
    [Parameter]
    public RenderFragment? Body { get; set; }
 
    /// <inheritdoc />
    // Derived instances of LayoutComponentBase do not appear in any statically analyzable
    // calls of OpenComponent<T> where T is well-known. Consequently we have to explicitly provide a hint to the trimmer to preserve
    // properties.
    [DynamicDependency(Component, typeof(LayoutComponentBase))]
    public override Task SetParametersAsync(ParameterView parameters) => base.SetParametersAsync(parameters);
}