public static IEnumerable <T> RecycleCollection <T>(IList collection, IEnumerable <T> source)
{
// Recycle the collection of items.
List <Placeholder <T> > newItems = new List <Placeholder <T> >(collection.Count);
using (var recycleBin = new RecycleBin <Placeholder <T> >())
{
foreach (T item in collection)
{
recycleBin.AddObject(new Placeholder <T>(collection, item, true));
}
// Extract each item from the recycle bin.
foreach (T item in source)
{
newItems.Add(recycleBin.Extract(new Placeholder <T>(collection, item, false)));
}
}
for (int index = 0; index < newItems.Count; index++)
{
newItems[index].EnsureInCollectionAt(index);
}
return(newItems.Select(placeholder => placeholder.Item));
}
private void OnUpdateCollection()
{
// Get the source collection from the wrapped object.
IEnumerable <T> sourceCollection = _getMethod();
// Create a list of new items.
List <CollectionItem <T> > items = new List <CollectionItem <T> >();
// Dump all previous items into a recycle bin.
using (RecycleBin <CollectionItem <T> > bin = new RecycleBin <CollectionItem <T> >())
{
foreach (T oldItem in _collection)
{
bin.AddObject(new CollectionItem <T>(_collection, oldItem, true));
}
// Add new objects to the list.
if (sourceCollection != null)
{
foreach (T obj in sourceCollection)
{
items.Add(bin.Extract(new CollectionItem <T>(_collection, obj, false)));
}
}
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem <T> item in items)
{
item.EnsureInCollection(index);
++index;
}
}
private void AssignToObservableCollection(List <object> newCollection)
{
// Create a list of new items.
List <CollectionItem> items = new List <CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin <CollectionItem> bin = new RecycleBin <CollectionItem>())
{
foreach (object oldItem in _collection)
{
bin.AddObject(new CollectionItem(_collection, oldItem, true));
}
// Add new objects to the list.
if (newCollection != null)
{
foreach (object obj in newCollection)
{
items.Add(bin.Extract(new CollectionItem(_collection, obj, false)));
}
}
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
}
protected internal override void PublishChanges()
{
_publishingChanges = true;
try
{
if (_sourceCollection == null)
{
if (_collection != null)
{
_collection = null;
_collectionChangedFromUIEventHandlerSubscribed = false;
FirePropertyChanged();
}
return;
}
if (_collection == null)
{
_collection = new ObservableCollection <object>();
_collection.CollectionChanged += _collectionChangedFromUIEventHandler;
_collectionChangedFromUIEventHandlerSubscribed = true;
FirePropertyChanged();
}
// Create a list of new items.
List <CollectionItem> items = new List <CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin <CollectionItem> bin = new RecycleBin <CollectionItem>())
{
foreach (object oldItem in _collection)
{
bin.AddObject(new CollectionItem(_collection, oldItem, true));
}
// Add new objects to the list.
if (_sourceCollection != null)
{
foreach (object obj in _sourceCollection)
{
items.Add(bin.Extract(new CollectionItem(_collection, WrapValue(obj), false)));
}
}
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
}
finally
{
_publishingChanges = false;
}
}
private void UpdateItems()
{
++_updating;
try
{
if (GetItems != null)
{
// Use the adapter if the check state event is not defined.
GetObjectCheckStateDelegate getItemCheckState = GetItemCheckState;
if (getItemCheckState == null)
{
getItemCheckState = new GetObjectCheckStateDelegate(AdaptGetItemCheckState);
}
SetObjectCheckStateDelegate setItemCheckState = SetItemCheckState;
if (setItemCheckState == null)
{
setItemCheckState = new SetObjectCheckStateDelegate(AdaptSetItemCheckState);
}
// Recycle the collection of items.
ArrayList newItems = new ArrayList(base.Items.Count);
using (var recycleBin = new RecycleBin <CheckedListBoxItem>())
{
foreach (CheckedListBoxItem item in base.Items)
{
recycleBin.AddObject(item);
}
// Extract each item from the recycle bin.
foreach (object item in GetItems())
{
newItems.Add(recycleBin.Extract(
new CheckedListBoxItem(item, GetItemText, getItemCheckState, setItemCheckState)));
}
}
// Replace the items in the control.
base.BeginUpdate();
try
{
// Make sure the same tag is selected.
CheckedListBoxItem selectedItem = (CheckedListBoxItem)base.SelectedItem;
object selectedTag = selectedItem == null ? null : selectedItem.Tag;
base.Items.Clear();
base.Items.AddRange(newItems.ToArray());
base.SelectedIndex = IndexOfTag(selectedTag);
}
finally
{
base.EndUpdate();
}
}
}
finally
{
--_updating;
}
}
protected override void UpdateValue()
{
// Get the source collection from the wrapped object.
IEnumerable source = ClassProperty.GetObjectValue(ObjectInstance.WrappedObject) as IEnumerable;
if (source == null)
{
_collection = null;
return;
}
List <object> sourceCollection = source.OfType <object>().ToList();
// Delay the update to the observable collection so that we don't record dependencies on
// properties used in the items template. XAML will invoke the item template synchronously
// as we add items to the observable collection, thus causing other view model property
// getters to fire.
_delay = delegate
{
if (_collection == null)
{
_collection = new ObservableCollection <object>();
FirePropertyChanged();
}
// Create a list of new items.
List <CollectionItem> items = new List <CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin <CollectionItem> bin = new RecycleBin <CollectionItem>())
{
foreach (object oldItem in _collection)
{
bin.AddObject(new CollectionItem(_collection, oldItem, true));
}
// Add new objects to the list.
if (sourceCollection != null)
{
foreach (object obj in sourceCollection)
{
items.Add(bin.Extract(new CollectionItem(_collection, TranslateOutgoingValue(obj), false)));
}
}
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
};
}
public void UpdateNow()
{
if (_provider.IsCollection)
{
_depValue.OnGet();
// Create a list of new items.
List <CollectionItem> items = new List <CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin <CollectionItem> bin = new RecycleBin <CollectionItem>())
{
foreach (object oldItem in _collection)
{
bin.AddObject(new CollectionItem(_collection, oldItem, true));
}
// Add new objects to the list.
if (_sourceCollection != null)
{
foreach (object obj in _sourceCollection)
{
items.Add(bin.Extract(new CollectionItem(_collection, WrapValue(obj), false)));
}
}
_sourceCollection = null;
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
}
else
{
object oldValue = _value;
_depValue.OnGet();
object newValue = _value;
if (_initialized)
{
if ((!Object.Equals(newValue, oldValue)))
{
_wrapper.FirePropertyChanged(_propertyInfo.Name);
}
}
else
{
_initialized = true;
}
}
}
protected override void PublishChanges()
{
if (_sourceCollection == null)
{
if (_bindingList != null)
{
_bindingList = null;
FirePropertyChanged();
}
return;
}
if (_bindingList == null)
{
_bindingList = new BindingList <object>();
FirePropertyChanged();
}
_updating = true;
// Create a list of new items.
List <CollectionItem> items = new List <CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin <CollectionItem> bin = new RecycleBin <CollectionItem>())
{
foreach (object oldItem in _bindingList)
{
bin.AddObject(new CollectionItem(_bindingList, oldItem, true));
}
// Add new objects to the list.
if (_sourceCollection != null)
{
foreach (object obj in _sourceCollection)
{
items.Add(bin.Extract(new CollectionItem(_bindingList, WrapValue(obj), false)));
}
}
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
_updating = false;
}
private void OnUpdateCollection()
{
// Get the source collection from the wrapped object.
IEnumerable source = ClassProperty.GetObjectValue(ObjectInstance.WrappedObject) as IEnumerable;
List<object> sourceCollection = source.OfType<object>().ToList();
// Delay the update to the observable collection so that we don't record dependencies on
// properties used in the items template. XAML will invoke the item template synchronously
// as we add items to the observable collection, thus causing other view model property
// getters to fire.
_delay = delegate
{
// Create a list of new items.
List<CollectionItem> items = new List<CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin<CollectionItem> bin = new RecycleBin<CollectionItem>())
{
foreach (object oldItem in _collection)
bin.AddObject(new CollectionItem(_collection, oldItem, true));
// Add new objects to the list.
if (sourceCollection != null)
foreach (object obj in sourceCollection)
items.Add(bin.Extract(new CollectionItem(_collection, TranslateOutgoingValue(obj), false)));
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
};
}
private void UpdateItems()
{
++_updating;
try
{
if ( GetItems != null )
{
// Use the adapter if the check state event is not defined.
GetObjectCheckStateDelegate getItemCheckState = GetItemCheckState;
if ( getItemCheckState == null )
getItemCheckState = new GetObjectCheckStateDelegate( AdaptGetItemCheckState );
SetObjectCheckStateDelegate setItemCheckState = SetItemCheckState;
if ( setItemCheckState == null )
setItemCheckState = new SetObjectCheckStateDelegate( AdaptSetItemCheckState );
// Recycle the collection of items.
ArrayList newItems = new ArrayList( base.Items.Count );
using (var recycleBin = new RecycleBin<CheckedListBoxItem>())
{
foreach (CheckedListBoxItem item in base.Items)
recycleBin.AddObject(item);
// Extract each item from the recycle bin.
foreach ( object item in GetItems() )
{
newItems.Add( recycleBin.Extract(
new CheckedListBoxItem( item, GetItemText, getItemCheckState, setItemCheckState ) ) );
}
}
// Replace the items in the control.
base.BeginUpdate();
try
{
// Make sure the same tag is selected.
CheckedListBoxItem selectedItem = (CheckedListBoxItem)base.SelectedItem;
object selectedTag = selectedItem == null ? null : selectedItem.Tag;
base.Items.Clear();
base.Items.AddRange( newItems.ToArray() );
base.SelectedIndex = IndexOfTag( selectedTag );
}
finally
{
base.EndUpdate();
}
}
}
finally
{
--_updating;
}
}
private void AssignToObservableCollection(List<object> newCollection)
{
// Create a list of new items.
List<CollectionItem> items = new List<CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin<CollectionItem> bin = new RecycleBin<CollectionItem>())
{
foreach (object oldItem in _collection)
bin.AddObject(new CollectionItem(_collection, oldItem, true));
// Add new objects to the list.
if (newCollection != null)
foreach (object obj in newCollection)
items.Add(bin.Extract(new CollectionItem(_collection, obj, false)));
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
}