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Diffstat (limited to 'Xamarin.Forms.Core/ItemsViewSimple.cs')
| -rw-r--r-- | Xamarin.Forms.Core/ItemsViewSimple.cs | 356 |
1 files changed, 0 insertions, 356 deletions
diff --git a/Xamarin.Forms.Core/ItemsViewSimple.cs b/Xamarin.Forms.Core/ItemsViewSimple.cs deleted file mode 100644 index 8ad82b7f..00000000 --- a/Xamarin.Forms.Core/ItemsViewSimple.cs +++ /dev/null @@ -1,356 +0,0 @@ -using System; -using System.Collections; -using System.Collections.Generic; -using System.Collections.Specialized; -using System.Linq; -using System.Runtime.CompilerServices; - -namespace Xamarin.Forms -{ - public abstract class ItemsView : View, IItemViewController - { - public static readonly BindableProperty ItemsSourceProperty = - BindableProperty.Create( - propertyName: "ItemsSource", - returnType: typeof(IEnumerable), - declaringType: typeof(ItemsView), - defaultValue: Enumerable.Empty<object>() - ); - - public static readonly BindableProperty ItemTemplateProperty = - BindableProperty.Create( - propertyName: "ItemTemplate", - returnType: typeof(DataTemplate), - declaringType: typeof(ItemsView) - ); - - ItemSource _itemSource; - - internal ItemsView() - { - } - - public IEnumerable ItemsSource - { - get - { - return (IEnumerable)GetValue(ItemsSourceProperty); - } - set - { - SetValue(ItemsSourceProperty, value); - } - } - - public DataTemplate ItemTemplate - { - get - { - return (DataTemplate)GetValue(ItemTemplateProperty); - } - set - { - SetValue(ItemTemplateProperty, value); - } - } - - int IItemViewController.Count => _itemSource.Count; - - void IItemViewController.BindView(View view, object item) - { - view.BindingContext = item; - } - - View IItemViewController.CreateView(object type) - { - var dataTemplate = (DataTemplate)type; - object content = dataTemplate.CreateContent(); - var view = (View)content; - view.Parent = this; - return view; - } - - object IItemViewController.GetItem(int index) => _itemSource[index]; - - object IItemViewController.GetItemType(object item) - { - DataTemplate dataTemplate = ItemTemplate; - var dataTemplateSelector = dataTemplate as DataTemplateSelector; - if (dataTemplateSelector != null) - dataTemplate = dataTemplateSelector.SelectTemplate(item, this); - - if (item == null) - throw new ArgumentException($"No DataTemplate resolved for item: {item}."); - - return dataTemplate; - } - - protected override void OnPropertyChanged([CallerMemberName] string propertyName = null) - { - if (propertyName == nameof(ItemsSource)) - { - var itemsSource = ItemsSource; - if (itemsSource == null) - itemsSource = Enumerable.Empty<object>(); - - // abstract enumerable, IList, IList<T>, and IReadOnlyList<T> - _itemSource = new ItemSource(itemsSource); - - // subscribe to collection changed events - var dynamicItemSource = _itemSource as INotifyCollectionChanged; - if (dynamicItemSource != null) - { - new WeakNotifyCollectionChanged(this, dynamicItemSource); - } - } - - base.OnPropertyChanged(propertyName); - } - - internal event NotifyCollectionChangedEventHandler CollectionChanged; - - internal void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) - { - CollectionChanged?.Invoke(sender, e); - } - - sealed class WeakNotifyCollectionChanged - { - readonly WeakReference<INotifyCollectionChanged> _weakCollection; - readonly WeakReference<ItemsView> _weakSource; - - public WeakNotifyCollectionChanged(ItemsView source, INotifyCollectionChanged incc) - { - incc.CollectionChanged += OnCollectionChanged; - - _weakSource = new WeakReference<ItemsView>(source); - _weakCollection = new WeakReference<INotifyCollectionChanged>(incc); - } - - void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) - { - ItemsView source; - if (!_weakSource.TryGetTarget(out source)) - { - INotifyCollectionChanged collection; - if (_weakCollection.TryGetTarget(out collection)) - collection.CollectionChanged -= OnCollectionChanged; - - return; - } - - source.OnCollectionChanged(sender, e); - } - } - - sealed class ItemSource : IEnumerable<object>, INotifyCollectionChanged - { - IndexableCollection _indexable; - - internal ItemSource(IEnumerable enumerable) - { - _indexable = new IndexableCollection(enumerable); - var dynamicItemSource = enumerable as INotifyCollectionChanged; - if (dynamicItemSource != null) - dynamicItemSource.CollectionChanged += OnCollectionChanged; - } - - public int Count => _indexable.Count; - - public IEnumerable Enumerable => _indexable.Enumerable; - - public object this[int index] - { - get - { - // madness ported from listProxy - CollectionSynchronizationContext syncContext = SyncContext; - if (syncContext != null) - { - object value = null; - syncContext.Callback(Enumerable, SyncContext.Context, () => value = _indexable[index], false); - - return value; - } - - return _indexable[index]; - } - } - - CollectionSynchronizationContext SyncContext - { - get - { - CollectionSynchronizationContext syncContext; - BindingBase.TryGetSynchronizedCollection(Enumerable, out syncContext); - return syncContext; - } - } - - IEnumerator IEnumerable.GetEnumerator() - { - return GetEnumerator(); - } - - IEnumerator<object> IEnumerable<object>.GetEnumerator() - { - return GetEnumerator(); - } - - public event NotifyCollectionChangedEventHandler CollectionChanged; - - public Enumerator GetEnumerator() - { - return new Enumerator(this); - } - - void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) - { - Action onCollectionChanged = () => - { - if (CollectionChanged != null) - CollectionChanged(this, e); - }; - - // madness ported from listProxy - CollectionSynchronizationContext syncContext = SyncContext; - if (syncContext != null) - { - syncContext.Callback(Enumerable, syncContext.Context, () => Device.BeginInvokeOnMainThread(onCollectionChanged), false); - } - - else if (Device.IsInvokeRequired) - Device.BeginInvokeOnMainThread(onCollectionChanged); - - else - onCollectionChanged(); - } - - internal struct Enumerator : IEnumerator<object> - { - readonly ItemSource _itemSource; - int _index; - - internal Enumerator(ItemSource itemSource) : this() - { - _itemSource = itemSource; - } - - public bool MoveNext() - { - if (_index == _itemSource.Count) - return false; - - Current = _itemSource[_index++]; - return true; - } - - public object Current - { - get; private set; - } - - public void Reset() - { - Current = null; - _index = 0; - } - - public void Dispose() - { - } - } - - struct IndexableCollection : IEnumerable<object> - { - internal IndexableCollection(IEnumerable list) - { - Enumerable = list; - - if (list is IList) - return; - - if (list is IList<object>) - return; - - if (list is IReadOnlyList<object>) - return; - - Enumerable = list.Cast<object>().ToArray(); - } - - internal IEnumerable Enumerable - { - get; - } - - internal int Count - { - get - { - var list = Enumerable as IList; - if (list != null) - return list.Count; - - var listOf = Enumerable as IList<object>; - if (listOf != null) - return listOf.Count; - - var readOnlyList = (IReadOnlyList<object>)Enumerable; - return readOnlyList.Count; - } - } - - internal object this[int index] - { - get - { - var list = Enumerable as IList; - if (list != null) - return list[index]; - - var listOf = Enumerable as IList<object>; - if (listOf != null) - return listOf[index]; - - var readOnlyList = (IReadOnlyList<object>)Enumerable; - return readOnlyList[index]; - } - } - - internal int IndexOf(object item) - { - var list = Enumerable as IList; - if (list != null) - return list.IndexOf(item); - - var listOf = Enumerable as IList<object>; - if (listOf != null) - return listOf.IndexOf(item); - - var readOnlyList = (IReadOnlyList<object>)Enumerable; - return readOnlyList.IndexOf(item); - } - - public IEnumerator<object> GetEnumerator() - { - var list = Enumerable as IList; - if (list != null) - return list.Cast<object>().GetEnumerator(); - - var listOf = Enumerable as IList<object>; - if (listOf != null) - return listOf.GetEnumerator(); - - var readOnlyList = (IReadOnlyList<object>)Enumerable; - return readOnlyList.GetEnumerator(); - } - - IEnumerator IEnumerable.GetEnumerator() - { - return GetEnumerator(); - } - } - } - } -}
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