/// <summary>
/// Enables a transposer to the passed <paramref name="cache"/>. If there is already a transposer enabled then the old one will be removed and <see cref="ITransposer.OnUntie(object, object)"/>
/// will be called.
/// </summary>
/// <param name="cache">The cache for enabling a transposer.</param>
/// <param name="view">The view for the transposer.</param>
/// <param name="transposer">The transposer which should be enabled.</param>
private static void EnableTransposer(Dictionary <object, TransposerEntry> cache, object view, ITransposer transposer)
{
if (cache.TryGetValue(view, out TransposerEntry entry))
{
object viewModel = entry.ViewModel;
transposer = entry.Transposer;
transposer?.OnUntie(view, viewModel);
cache.Remove(view);
}
if (transposer == null)
{
return;
}
object context = GetContextFromView(view);
transposer.OnTie(view, context);
cache[view] = new TransposerEntry(transposer, context);
}
public TransposerEntry(ITransposer transposer, object viewModel)
{
Transposer = transposer;
ViewModel = viewModel;
}
