/// <summary>
/// Adds an item to the collection.
/// </summary>
/// <param name="item">The item to add.</param>
public override void Add(ObservableRecursiveCollection <T> item)
{
base.Add(item);
OnPropertyChanged(nameof(Count));
OnPropertyChanged(Binding.IndexerName);
//Note: We must cast the item to type 'object' so that the correct overload is called, since our list items are also collections.
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)item));
item.Parent = this;
}
/// <summary>
/// Inserts an item into the collection at the specified index.
/// </summary>
/// <param name="index">The index at which to insert the item.</param>
/// <param name="item">The item to insert into the collection.</param>
public override void Insert(int index, ObservableRecursiveCollection <T> item)
{
//Note: No error handling necessary.
// If the index is out of bounds, then let the list's insert method throw an exception.
base.Insert(index, item);
OnPropertyChanged(nameof(Count));
OnPropertyChanged(Binding.IndexerName);
//Note: We must cast the item to type 'object' so that the correct overload is called, since our list items are also collections.
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)item, index));
item.Parent = this;
}
/// <summary>
/// Removes the first occurrence of a specific item from the collection.
/// </summary>
/// <param name="item">The item to remove from the collection.</param>
/// <returns>
/// Returns true if the item was successfully removed from the collection, otherwise false.
/// This method also returns false if item was not found in the collection.
/// </returns>
public override bool Remove(ObservableRecursiveCollection <T> item)
{
bool removed = base.Remove(item);
if (removed)
{
OnPropertyChanged(nameof(Count));
OnPropertyChanged(Binding.IndexerName);
//Note: We must cast the item to type 'object' so that the correct overload is called, since our list items are also collections.
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, (object)item));
if (item.Parent == this && !Contains(item))
{
item.Parent = null;
}
}
return(removed);
}
/// <summary>
/// Removes all items from the collection.
/// </summary>
public override void Clear()
{
var oldItems = new ObservableRecursiveCollection <T> [Count];
ListItems.CopyTo(oldItems, 0);
base.Clear();
OnPropertyChanged(nameof(Count));
OnPropertyChanged(Binding.IndexerName);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
foreach (var item in oldItems)
{
if (item.Parent == this)
{
item.Parent = null;
}
}
}
/// <summary>
/// Creates a new instance of <see cref="ObservableRecursiveCollection{T}"/>.
/// </summary>
/// <param name="value">
/// The value at this node of the <see cref="ObservableRecursiveCollection{T}"/>.
/// </param>
/// <param name="parent">
/// The collection of items that is the hierarchical parent of this collection.
/// </param>
/// <param name="childItems">
/// A collection of value to initialize this collection with, as
/// the hierarchical children of this node.
/// </param>
public ObservableRecursiveCollection(T value, ObservableRecursiveCollection <T> parent, params T[] childItems)
{
Value = value;
Parent = parent;
Children = new List <ObservableRecursiveCollection <T> >(childItems.Select(childItem => new ObservableRecursiveCollection <T>(childItem, this)));
}
/// <summary>
/// Creates a new instance of <see cref="ObservableRecursiveCollection{T}"/>.
/// </summary>
/// <param name="value">
/// The value at this node of the <see cref="ObservableRecursiveCollection{T}"/>.
/// </param>
/// <param name="parent">
/// The collection of items that is the hierarchical parent of this collection.
/// </param>
public ObservableRecursiveCollection(T value, ObservableRecursiveCollection <T> parent)
{
Value = value;
Parent = parent;
Children = new List <ObservableRecursiveCollection <T> >();
}
