/// <summary>
/// Adds a <see cref="Control"/> to the <see cref="ControlCollection"/> at the specified index.
/// </summary>
/// <param name="existing">The existing control at which child should be inserted.</param>
/// <param name="child">The <see cref="Control"/> to insert into the <see cref="ControlCollection"/>.</param>
/// <param name="relativeAlignment">The relative placement of the child control to the existing one.</param>
/// <param name="width">The width of the child.</param>
/// <param name="height">The height of the child.</param>
/// <param name="hexpand">The horizontal expand of <paramref name="child"/>.</param>
/// <param name="vexpand">The vertical expand of <paramref name="child"/>.</param>
/// <param name="alignment">The alignment of <paramref name="child"/>.</param>
public void Insert(Control existing, Control child, RelativeAlignment relativeAlignment, int width, int height, int hexpand, int vexpand, Alignment alignment)
{
if (width < 0)
{
throw new ArgumentOutOfRangeException(nameof(width));
}
if (height < 0)
{
throw new ArgumentOutOfRangeException(nameof(height));
}
if (existing == null)
{
throw new ArgumentNullException(nameof(existing));
}
if (existing.IsInvalid)
{
throw new InvalidHandleException();
}
if (child == null)
{
throw new ArgumentNullException(nameof(child));
}
if (child.IsInvalid)
{
throw new InvalidHandleException();
}
if (child.TopLevel)
{
throw new ArgumentException("Cannot add a top-level control to a ControlCollectionBase{TContainer, TCollection, T}.");
}
if (Contains(child))
{
throw new InvalidOperationException("Cannot add the same control more than once.");
}
ToLibuiAligns(alignment, out Libui.Align halign, out Libui.Align valign);
Libui.GridInsertAt(Owner.Handle, child.Handle, existing.Handle, relativeAlignment, width, height, hexpand, halign, vexpand, valign);
base.Insert(existing.Index, child);
}
