// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Globalization;
 
namespace System.Windows.Forms;
 
/// <summary>
///  This control collection only allows a specific type of control
///  into the controls collection. It optionally supports readonlyness.
/// </summary>
internal class TypedControlCollection : ReadOnlyControlCollection
{
    private readonly Type _typeOfControl;
    private readonly Control _ownerControl;
 
    public TypedControlCollection(Control owner, Type typeOfControl, bool isReadOnly)
        : base(owner, isReadOnly)
    {
        _typeOfControl = typeOfControl;
        _ownerControl = owner;
    }
 
    public TypedControlCollection(Control owner, Type typeOfControl)
        : base(owner, isReadOnly: false)
    {
        _typeOfControl = typeOfControl;
        _ownerControl = owner;
    }
 
    public override void Add(Control? value)
    {
        if (value is null)
        {
            return;
        }
 
        // Check parenting first for consistency
        Control.CheckParentingCycle(_ownerControl, value);
 
        if (IsReadOnly)
        {
            throw new NotSupportedException(SR.ReadonlyControlsCollection);
        }
 
        if (!_typeOfControl.IsAssignableFrom(value.GetType()))
        {
            throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, string.Format(SR.TypedControlCollectionShouldBeOfType, _typeOfControl.Name)), value.GetType().Name);
        }
 
        base.Add(value);
    }
}