nuclex-shared-dotnet/Nuclex.Support
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Redesigned the Collection framework to incorporate a more general variant of the ObservableCollection<> class; ParentingCollection class now makes use of this new inbetween class; ParentingCollection now has a cleaner way to dispose its members than the original InternalDispose() method

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git-svn-id: file:///srv/devel/repo-conversion/nusu@37 d2e56fa2-650e-0410-a79f-9358c0239efd
This commit is contained in:
Markus Ewald 2007-07-10 19:25:18 +00:00
parent 4933604495
commit ba1cee917d
10 changed files with 218 additions and 163 deletions
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58
Source/Collections/ParentingCollection.cs
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@ -33,7 +33,7 @@ namespace Nuclex.Support.Collections {
/// </remarks>
/// <typeparam name="ParentType">Type of the parent object to assign to items</typeparam>
/// <typeparam name="ItemType">Type of the items being managed in the collection</typeparam>
public class ParentingCollection<ParentType, ItemType> : Collection<ItemType>
public class ParentingCollection<ParentType, ItemType> : AcquiringCollection<ItemType>
where ItemType : Parentable<ParentType> {
/// <summary>Reparents all elements in the collection</summary>
@ -45,39 +45,19 @@ namespace Nuclex.Support.Collections {
base[index].SetParent(parent);
}
/// <summary>Clears all elements from the collection</summary>
protected override void ClearItems() {
for(int index = 0; index < Count; ++index)
base[index].SetParent(default(ParentType));
base.ClearItems();
}
/// <summary>Inserts a new element into the collection</summary>
/// <param name="index">Index at which to insert the element</param>
/// <param name="item">Item to be inserted</param>
protected override void InsertItem(int index, ItemType item) {
base.InsertItem(index, item);
/// <summary>Called when an item has been added to the collection</summary>
/// <param name="item">Item that has been added to the collection</param>
protected virtual void OnAdded(ItemType item) {
item.SetParent(this.parent);
}
/// <summary>Removes an element from the collection</summary>
/// <param name="index">Index of the element to remove</param>
protected override void RemoveItem(int index) {
base[index].SetParent(default(ParentType));
base.RemoveItem(index);
}
/// <summary>Takes over a new element that is directly assigned</summary>
/// <param name="index">Index of the element that was assigned</param>
/// <param name="item">New item</param>
protected override void SetItem(int index, ItemType item) {
base.SetItem(index, item);
item.SetParent(this.parent);
/// <summary>Called when an item has been removed from the collection</summary>
/// <param name="item">Item that has been removed from the collection</param>
protected virtual void OnRemoved(ItemType item) {
item.SetParent(default(ParentType));
}
/// <summary>Disposes the collection and optionally all items contained therein</summary>
/// <param name="disposeItems">Whether to try calling Dispose() on all items</param>
/// <remarks>
/// <para>
/// This method is intended to support collections that need to dispose of their
@ -95,25 +75,23 @@ namespace Nuclex.Support.Collections {
/// line with InternalDispose(true); in your custom Dispose() method.
/// </para>
/// </remarks>
protected void InternalDispose(bool disposeItems) {
protected void DisposeItems() {
if(disposeItems) {
// Dispose all the items in the collection that implement IDisposable,
// starting from the last item in the assumption that this is the fastest
// way to empty a list without causing excessive shiftings in the array.
for(int index = base.Count - 1; index >= 0; --index) {
// Dispose of all the items in the collection that implement IDisposable
foreach(ItemType item in this) {
IDisposable disposable = item as IDisposable;
IDisposable disposable = base[index] as IDisposable;
// If the item is disposable, we get rid of it
if(disposable != null)
disposable.Dispose();
base.RemoveAt(index);
}
// If the item is disposable, destroy it now
if(disposable != null)
disposable.Dispose();
}
// Remove all items from the collection
base.ClearItems();
}
/// <summary>Parent this collection currently belongs to</summary>