public static void ChangeAllCanExecute(this PageViewModel viewmodel)
{
var props = viewmodel.GetType().GetProperties().Where(q => q.PropertyType.Equals(typeof(Command))).ToArray();
var commands = props.Select(q => (Command)q.GetValue(viewmodel)).ToArray();
commands.ForEach(q => q.ChangeCanExecute());
}
private static Type?GetViewType(PageViewModel vm)
{
Type?t = vm.GetType();
foreach (Type?j in Objects.GetTypes <T>(true))
{
if (j.GetAttr <PageViewModelAttribute>()?.ViewType == t)
{
return(j);
}
}
return(vm.GetAttr <ViewAttribute>()?.ViewType is { } tt&& tt.Implements <T>() && tt.IsInstantiable() ? tt : null);
}
static Fragment GetPageFragment(PageViewModel page)
{
switch (page)
{
case FirstPageViewModel firstPage:
return(new FragmentOne());
case SecondPageViewModel secondPage:
return(new FragmentTwo());
case ThirdPageViewModel thirdPage:
return(new FragmentThree());
default:
throw new ArgumentException($"Not supported page {page.GetType().Name}", nameof(page));
}
}
/// <summary>
/// Obtiene una excepción que se produce cuando no se ha podido
/// localizar un contenedor visual para el <see cref="PageViewModel"/>
/// especificado.
/// </summary>
/// <param name="vm">
/// <see cref="PageViewModel"/> para el cual no se pudo encontrar un
/// contenedor visual.
/// </param>
/// <returns>
/// Una nueva instancia de la clase <see cref="MissingTypeException"/>
/// con un mensaje que describe la excepción ocurrida.
/// </returns>
public static Exception VisualHostNotFound(PageViewModel vm)
{
return(new MissingTypeException(string.Format(St.VisualHostNotFound,
vm.UiServices?.VisualHost.Title.OrNull() ??
vm.GetType().NameOf())));
}