protected override void OnParametersSet()
{
_backgroundColor = StyleContext.GetColorOrDefault(VariableNames.SwitchBackground, VariableNames.NeutralQuaternary);
// Select first item if no value is selected
if (Value == null &&
Items != null)
{
Value = Items.FirstOrDefault();
}
// Ensure that a converter got supplied
// -> Only required when the value is not of type "IOption"
if (Converter == null &&
Items != null &&
Items is not IEnumerable <IOption> )
{
throw new ApplicationException($"Cannot convert '{typeof(TItem).FullName}' to '{typeof(IOption).FullName}' without a converter.");
}
if (_iteratorUpdateRequired)
{
_iterator = new SelectIterator <TItem, IOption>(_items, Converter);
}
}
/// <summary>
/// Projects each element of a sequence into a new form.
/// </summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source"/>.</typeparam>
/// <typeparam name="TResult">The type of the value returned by <paramref name="selector"/>.</typeparam>
/// <param name="source">A sequence of values to invoke a transform function on.</param>
/// <param name="selector">A transform function to apply to each element.</param>
/// <param name="dependencyAnalysisMode">The dependency analysis mode.</param>
/// <returns>
/// An <see cref="IBindableCollection{TElement}"/> whose elements are the result of invoking the transform function on each element of <paramref name="source"/>.
/// </returns>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="source"/> or <paramref name="selector"/> is null.</exception>
public static IBindableCollection <TResult> Select <TSource, TResult>(this IBindableCollection <TSource> source, Expression <Func <TSource, TResult> > selector, DependencyDiscovery dependencyAnalysisMode) where TSource : class
{
source.ShouldNotBeNull("source");
selector.ShouldNotBeNull("selector");
var result = new SelectIterator <TSource, TResult>(source, selector.Compile(), source.Dispatcher);
if (dependencyAnalysisMode == DependencyDiscovery.Enabled)
{
result = result.DependsOnExpression(selector.Body, selector.Parameters[0]);
}
return(result);
}
protected override void OnParametersSet()
{
_backgroundColor = StyleContext.GetColorOrDefault(VariableNames.TabBarColor, VariableNames.NeutralSecondary);
_activeBackgroundColor = StyleContext.GetColorOrDefault(VariableNames.TabBarActiveColor, VariableNames.ThemePrimary);
// Ensure that a converter got supplied
// -> Only required when the value is not of type "IIconOption"
if (Converter == null &&
Items != null &&
Items is not IEnumerable <IIconOption> )
{
throw new ApplicationException($"Cannot convert '{typeof(TItem).FullName}' to '{typeof(IIconOption).FullName}' without a converter.");
}
if (_iteratorUpdateRequired)
{
_iterator = new SelectIterator <TItem, IIconOption>(_items, Converter);
}
}
