/// <summary>
/// <para>Extension method that binds an observable of a list of collection
/// sections as the source of a <see cref="UICollectionView"/>.</para>
/// <para>If your <see cref="IReadOnlyList{T}"/> is also an instance of
/// <see cref="INotifyCollectionChanged"/>, then this method
/// will silently update the bindings whenever it changes as well.
/// Otherwise, it will just log a message.</para>
/// </summary>
/// <returns>The <see cref="IDisposable"/> used to dispose this binding.</returns>
/// <param name="sectionsObservable">Sections observable.</param>
/// <param name="collectionView">Collection view.</param>
/// <param name="initSource">Optionally initializes some property of
/// the <see cref="ReactiveCollectionViewSource{TSource}"/>.</param>
/// <typeparam name="TSource">Type of the view source.</typeparam>
/// <typeparam name="TCell">Type of the <see cref="UICollectionViewCell"/>.</typeparam>
public static IDisposable BindTo <TSource, TCell>(
this IObservable <IReadOnlyList <CollectionViewSectionInformation <TSource, TCell> > > sectionsObservable,
UICollectionView collectionView,
Func <ReactiveCollectionViewSource <TSource>, IDisposable>?initSource = null)
where TCell : UICollectionViewCell
{
if (sectionsObservable is null)
{
throw new ArgumentNullException(nameof(sectionsObservable));
}
if (collectionView is null)
{
throw new ArgumentNullException(nameof(collectionView));
}
var source = new ReactiveCollectionViewSource <TSource>(collectionView);
initSource?.Invoke(source);
var bind = sectionsObservable.BindTo(source, x => x.Data);
collectionView.Source = source;
return(new CompositeDisposable(bind, source));
}
/// <summary>
/// <para>Extension method that binds an observable of a list of collection
/// sections as the source of a <see cref="UICollectionView"/>.</para>
/// <para>If your <see cref="IReadOnlyList"/> is also an instance of
/// <see cref="IReactiveNotifyCollectionChanged"/>, then this method
/// will silently update the bindings whenever it changes as well.
/// Otherwise, it will just log a message.</para>
/// </summary>
/// <returns>The <see cref="IDisposable"/> used to dispose this binding.</returns>
/// <param name="sectionsObservable">Sections observable.</param>
/// <param name="collectionView">Collection view.</param>
/// <param name="initSource">Optionally initializes some property of
/// the <see cref="ReactiveCollectionViewSource"/>.</param>
/// <typeparam name="TCell">Type of the <see cref="UICollectionViewCell"/>.</typeparam>
public static IDisposable BindTo <TSource, TCell>(
this IObservable <IReadOnlyList <CollectionViewSectionInformation <TSource, TCell> > > sectionsObservable,
UICollectionView collectionView,
Func <ReactiveCollectionViewSource <TSource>, IDisposable> initSource = null)
where TCell : UICollectionViewCell
{
var source = new ReactiveCollectionViewSource <TSource>(collectionView);
if (initSource != null)
{
initSource(source);
}
var bind = sectionsObservable.BindTo(source, x => x.Data);
collectionView.Source = source;
return(new CompositeDisposable(bind, source));
}