/// <summary>
/// Gets a binding that returns a <paramref name="defaultValue"/> if the specified <paramref name="binding"/> returns a null value.
/// </summary>
/// <returns>A new binding that returns a non-nullable value.</returns>
/// <param name="binding">Source of the binding to get the value.</param>
/// <param name="defaultValue">Default value, or null to use <c>default(TValue)</c>.</param>
/// <typeparam name="T">The type of the bindable object.</typeparam>
/// <typeparam name="TValue">The value type to convert from nullable to non-nullable.</typeparam>
public static BindableBinding <T, TValue> DefaultIfNull <T, TValue>(this BindableBinding <T, TValue?> binding, TValue?defaultValue = null)
where T : IBindable
where TValue : struct
{
return(binding.Convert(c => c ?? defaultValue ?? default(TValue), c => c));
}
/// <summary>
/// Gets a binding that returns a <paramref name="defaultValue"/> if the specified <paramref name="binding"/> returns a null value.
/// </summary>
/// <returns>A new binding that returns a non-null value.</returns>
/// <param name="binding">Source of the binding to get the value.</param>
/// <param name="defaultValue">Default value to return instead of null.</param>
/// <typeparam name="T">The type of the bindable object.</typeparam>
/// <typeparam name="TValue">The value type.</typeparam>
public static BindableBinding <T, TValue> DefaultIfNull <T, TValue>(this BindableBinding <T, TValue> binding, TValue defaultValue)
where T : IBindable
where TValue : class
{
return(binding.Convert(c => c ?? defaultValue, c => c));
}
/// <summary>
/// Gets a bindable binding with the inverse of the specified boolean value binding.
/// </summary>
/// <returns>A new binding to the inverse value.</returns>
/// <param name="binding">Binding to invert.</param>
/// <typeparam name="T">The type of the bindable object.</typeparam>
public static BindableBinding <T, bool> Inverse <T>(this BindableBinding <T, bool> binding)
where T : IBindable
{
return(binding.Convert(c => !c, c => !c));
}