/// <summary>
/// Låter andra klasser lyssna på förändringar i repositoryt så att de kan uppdateras.
/// </summary>
/// <param name="handler"></param>
/// <returns>Referns till en instans av FDRFeedRepository med eventhanterare</returns>
public static IRepository<Feed> getFeeds(NotifyCollectionChangedEventHandler handler)
{
if (feeds == null)
feeds = new FDRFeedRepository();
feeds.CollectionChanged += handler;
return feeds;
}
public void AddHandler(NotifyCollectionChangedEventHandler handler)
{
if(handler != null)
{
_books.CollectionChanged += handler;
}
}
public ItemsSourceCollectionViewSource([NotNull] UICollectionView collectionView,
string itemTemplate = AttachedMemberConstants.ItemTemplate)
: base(collectionView, itemTemplate)
{
_weakHandler = ReflectionExtensions.MakeWeakCollectionChangedHandler(this,
(adapter, o, arg3) => adapter.OnCollectionChanged(o, arg3));
}
public GeneratorNodeFactory( NotifyCollectionChangedEventHandler itemsChangedHandler,
NotifyCollectionChangedEventHandler groupsChangedHandler,
EventHandler<ExpansionStateChangedEventArgs> expansionStateChangedHandler,
EventHandler isExpandedChangingHandler,
EventHandler isExpandedChangedHandler,
DataGridControl dataGridControl )
{
if( itemsChangedHandler == null )
throw new ArgumentNullException( "itemsChangedHandler" );
if( groupsChangedHandler == null )
throw new ArgumentNullException( "groupsChangedHandler" );
if( expansionStateChangedHandler == null )
throw new ArgumentNullException( "expansionStateChangedHandler" );
if( isExpandedChangingHandler == null )
throw new ArgumentNullException( "isExpandedChangingHandler" );
if( isExpandedChangedHandler == null )
throw new ArgumentNullException( "isExpandedChangedHandler" );
m_itemsChangedHandler = itemsChangedHandler;
m_groupsChangedHandler = groupsChangedHandler;
m_expansionStateChangedHandler = expansionStateChangedHandler;
m_isExpandedChangingHandler = isExpandedChangingHandler;
m_isExpandedChangedHandler = isExpandedChangedHandler;
if( dataGridControl != null )
{
m_dataGridControl = new WeakReference( dataGridControl );
}
}
public CollectionChangedEventListener(INotifyCollectionChanged source, NotifyCollectionChangedEventHandler handler)
{
if (source == null) { throw new ArgumentNullException("source"); }
if (handler == null) { throw new ArgumentNullException("handler"); }
this.source = source;
this.handler = handler;
}
/// <summary>
/// Låter andra klasser lyssna på förändringar i repositoryt så att de kan uppdateras.
/// </summary>
/// <param name="handler"></param>
/// <returns>Referns till en instans av FDRCategoryRepository med eventhanterare</returns>
public static IRepository<Category> getCategories(NotifyCollectionChangedEventHandler handler)
{
if (categories == null)
categories = new FDRCategoryRepository();
categories.CollectionChanged += handler;
return categories;
}
public static void OnAutoScrollToEndChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
var ctrl = s as ItemsControl;
if (ctrl == null)
throw new InvalidOperationException("This attached property only supports ItemsControl or derived types.");
var data = ctrl.Items as INotifyCollectionChanged;
if (data == null)
throw new InvalidOperationException("Collection does not support change notifications.");
Control parentCtrl = ctrl;
while (parentCtrl != null && parentCtrl.GetType() != typeof(ScrollViewer))
parentCtrl = parentCtrl.Parent as Control;
ScrollViewer sv = parentCtrl as ScrollViewer;
var scrollToEndHandler = new NotifyCollectionChangedEventHandler(
(s1, e1) =>
{
if (e1.Action == NotifyCollectionChangedAction.Add && sv != null)
sv.ScrollToBottom();
});
if ((bool)e.NewValue)
data.CollectionChanged += scrollToEndHandler;
else
data.CollectionChanged -= scrollToEndHandler;
}
public static void OnAutoScrollChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
var val = (bool)e.NewValue;
var lb = s as ListView;
if (lb == null)
throw new InvalidOperationException("This behavior can only be attached to a ListView.");
var ic = lb.Items;
var data = ic.SourceCollection as INotifyCollectionChanged;
if (data == null) return;
var autoscroller = new NotifyCollectionChangedEventHandler(
(s1, e1) =>
{
var selectedItem = default(object);
switch (e1.Action)
{
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Move: selectedItem = e1.NewItems[e1.NewItems.Count - 1]; break;
case NotifyCollectionChangedAction.Remove: if (ic.Count < e1.OldStartingIndex) { selectedItem = ic[e1.OldStartingIndex - 1]; } else if (ic.Count > 0) selectedItem = ic[0]; break;
case NotifyCollectionChangedAction.Reset: if (ic.Count > 0) selectedItem = ic[0]; break;
}
if (selectedItem == default(object)) return;
ic.MoveCurrentTo(selectedItem);
lb.ScrollIntoView(selectedItem);
});
if (val) data.CollectionChanged += autoscroller;
else data.CollectionChanged -= autoscroller;
}
public static void OnAutoScrollToEndChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
var listBox = s as ListBox;
if(listBox==null)
return;
var listBoxItems = listBox.Items;
var data = listBoxItems.SourceCollection as INotifyCollectionChanged;
if (data == null)
return;
var scrollToEndHandler = new NotifyCollectionChangedEventHandler(
(s1, e1) =>
{
if (listBox.Items.Count <= 0)
return;
var lastItem = listBox.Items[listBox.Items.Count - 1];
listBoxItems.MoveCurrentTo(lastItem);
listBox.ScrollIntoView(lastItem);
});
if ((bool)e.NewValue)
data.CollectionChanged += scrollToEndHandler;
else
data.CollectionChanged -= scrollToEndHandler;
}
public MvvmPickerViewModel([NotNull] UIPickerView pickerView)
{
Should.NotBeNull(pickerView, "pickerView");
_pickerView = ServiceProvider.WeakReferenceFactory(pickerView);
_weakHandler = ReflectionExtensions.MakeWeakCollectionChangedHandler(this,
(adapter, o, arg3) => adapter.OnCollectionChanged(o, arg3));
EmptyTitle = "-";
}
/// <summary>
/// Hookups the handler to the collection changed event. When the value changes it removes the handler.
/// </summary>
/// <param name="oldValue">The old collection.</param>
/// <param name="newValue">The new collection.</param>
/// <param name="handler">The handler to hookup.</param>
public static void HookupToCollectionChanged(INotifyCollectionChanged oldValue, INotifyCollectionChanged newValue,
NotifyCollectionChangedEventHandler handler)
{
if (oldValue != null)
oldValue.CollectionChanged -= handler;
if (newValue != null)
newValue.CollectionChanged += handler;
}
public EventTracker(IVisualElementRenderer renderer)
{
if (renderer == null)
throw new ArgumentNullException("renderer");
_collectionChangedHandler = ModelGestureRecognizersOnCollectionChanged;
_renderer = renderer;
_renderer.ElementChanged += OnElementChanged;
}
public PropertiesWindowViewModel(PropertiesWindow propertiesWindow)
{
this.propertiesWindow = propertiesWindow;
onSelectionChanged = (sender, args) =>
{
SelectionChanged(sender, args);
};
Items = new ObservableCollection<PropertySingleItem>();
}
private static void Subscribe(DataGrid dataGrid)
{
var handler = new NotifyCollectionChangedEventHandler((sender, eventArgs) => ScrollToEnd(dataGrid));
if (handlersDict.ContainsKey(dataGrid))
{
return;
}
handlersDict.Add(dataGrid, handler);
((INotifyCollectionChanged)dataGrid.Items).CollectionChanged += handler;
ScrollToEnd(dataGrid);
}
/// <summary>
/// Adds a weak event listener for a CollectionChanged event.
/// </summary>
/// <param name="source">The source of the event.</param>
/// <param name="handler">The event handler.</param>
/// <exception cref="ArgumentNullException">source must not be <c>null</c>.</exception>
/// <exception cref="ArgumentNullException">handler must not be <c>null</c>.</exception>
protected void AddWeakEventListener(INotifyCollectionChanged source, NotifyCollectionChangedEventHandler handler)
{
if (source == null) { throw new ArgumentNullException("source"); }
if (handler == null) { throw new ArgumentNullException("handler"); }
CollectionChangedEventListener listener = new CollectionChangedEventListener(source, handler);
collectionChangedListeners.Add(listener);
CollectionChangedEventManager.AddListener(source, listener);
}
private static void SetupOnUnloadedHandler(DependencyObject dependencyObject, INotifyCollectionChanged observableCollection,
NotifyCollectionChangedEventHandler sourceChangedHandler)
{
RoutedEventHandler unloadedEventHandler = null;
unloadedEventHandler = (sender, args) =>
{
observableCollection.CollectionChanged -= sourceChangedHandler;
((ListViewBase)sender).SelectionChanged -= OnGridSelectionChanged;
((ListViewBase)sender).Unloaded -= unloadedEventHandler;
};
((ListViewBase)dependencyObject).Unloaded += unloadedEventHandler;
}
public override void Dispose()
{
if (IsDisposed) return;
foreach (var kvp in myObservedCollections)
kvp.Value ();
myObservedCollections.Clear();
myObservedCollections = null;
myCollectionChangedEventHandler = null;
base.Dispose ();
}
protected void RemoveEventListener(INotifyCollectionChanged source, NotifyCollectionChangedEventHandler handler)
{
if (source == null) { throw new ArgumentException("source"); }
if (handler == null) { throw new ArgumentException("handler"); }
CollectionChangedEventListener listener = collectionEventListeners.LastOrDefault(c => c.Source == source && c.Handler == handler);
if (listener != null)
{
collectionEventListeners.Remove(listener);
CollectionChangedEventManager.RemoveListener(source, listener);
}
}
public DataMappingViewModel(IWebActivity activity, NotifyCollectionChangedEventHandler mappingCollectionChangedEventHandler = null)
{
_activity = activity;
_actionManager = new ActionManager();
Inputs = new ObservableCollection<IInputOutputViewModel>();
Outputs = new ObservableCollection<IInputOutputViewModel>();
if(mappingCollectionChangedEventHandler != null)
{
Inputs.CollectionChanged += mappingCollectionChangedEventHandler;
Outputs.CollectionChanged += mappingCollectionChangedEventHandler;
}
Initialize(_activity);
}
public ItemsSourcePagerAdapter([NotNull] ViewPager viewPager)
{
Should.NotBeNull(viewPager, nameof(viewPager));
_viewPager = viewPager;
_fragmentManager = viewPager.GetFragmentManager();
_itemTemplateProvider = new DataTemplateProvider(viewPager, AttachedMemberConstants.ItemTemplate, AttachedMemberConstants.ItemTemplateSelector);
_weakHandler = ReflectionExtensions.MakeWeakCollectionChangedHandler(this, (adapter, o, arg3) => adapter.OnCollectionChanged(o, arg3));
var activityView = _viewPager.Context.GetActivity() as IActivityView;
if (activityView != null)
{
_listener = ReflectionExtensions.CreateWeakEventHandler<ItemsSourcePagerAdapter, EventArgs>(this, (adapter, o, arg3) => adapter.ActivityViewOnDestroyed((Activity)o));
activityView.Mediator.Destroyed += _listener.Handle;
}
}
private static void Subscribe(DataGrid dataGrid)
{
if (infoDict.ContainsKey(dataGrid))
return;
var timer = new DispatcherTimer(DispatcherPriority.Background);
var handler = new NotifyCollectionChangedEventHandler((sender, eventArgs) => timer.Start());
infoDict.Add(dataGrid, new DataGridInfo(handler, timer));
timer.Tick += (sender, args) => ScrollToEnd(dataGrid);
((INotifyCollectionChanged)dataGrid.Items).CollectionChanged += handler;
timer.Start();
}
internal void HandleToolCollectionNotification(NotifyCollectionChangedEventHandler listener, bool register)
{
if (null == listener)
{
throw FxTrace.Exception.ArgumentNull("listener");
}
if (register)
{
this.tools.CollectionChanged += listener;
}
else
{
this.tools.CollectionChanged -= listener;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ItemsSourceAdapter" /> class.
/// </summary>
public ItemsSourceRecyclerAdapter([NotNull] global::Android.Support.V7.Widget.RecyclerView recyclerView)
{
Should.NotBeNull(recyclerView, "recyclerView");
_recyclerView = recyclerView;
_itemTemplateProvider = new DataTemplateProvider(_recyclerView, AttachedMemberConstants.ItemTemplate,
AttachedMemberConstants.ItemTemplateSelector);
_layoutInflater = _recyclerView.Context.GetBindableLayoutInflater();
_weakHandler = ReflectionExtensions.MakeWeakCollectionChangedHandler(this,
(adapter, o, arg3) => adapter.OnCollectionChanged(o, arg3));
var activityView = _recyclerView.Context.GetActivity() as IActivityView;
if (activityView != null)
{
_listener = ReflectionExtensions.CreateWeakEventHandler<ItemsSourceRecyclerAdapter, EventArgs>(this, (adapter, o, arg3) => adapter.ActivityViewOnDestroyed((Activity)o));
activityView.Mediator.Destroyed += _listener.Handle;
}
}
/// <summary>
/// This method will be called when the AutoScrollToEnd
/// property was changed
/// </summary>
/// <param name="s">The sender (the ListBox)</param>
/// <param name="e">Some additional information</param>
public static void OnAutoScrollToEndChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
var listView = s as ListView;
if (listView != null)
{
var listViewItems = listView.Items;
var data = listViewItems.SourceCollection as INotifyCollectionChanged;
var scrollToEndHandler = new NotifyCollectionChangedEventHandler(
(s1, e1) =>
{
if (listView.Items.Count > 0 && e1 != null && e1.NewItems != null) // fix for error in certain conditions
{
//object lastItem = listView.Items[listView.Items.Count - 1];
var lastItem = e1.NewItems[0];
listView.Items.MoveCurrentTo(lastItem);
listView.ScrollIntoView(lastItem);
listView.SelectedItem = lastItem;
}
});
var gotFocusHandler = new RoutedEventHandler (
(s2, e2) =>
{
if (listView.Items.Count > 0)
{
//object lastItem = listView.Items[listView.Items.Count - 1];
listView.ScrollIntoView(listView.SelectedItem);
}
});
if ((bool)e.NewValue)
{
if (data != null)
{
data.CollectionChanged += scrollToEndHandler;
listView.GotFocus += gotFocusHandler;
}
}
else if (data != null)
{
data.CollectionChanged -= scrollToEndHandler;
listView.GotFocus -= gotFocusHandler;
}
}
}
public void Advertisements_WhenNewItemAdded_CallsCollectionChangedEvent()
{
// Arrange
var paperVm = GetValidNewspaperItemViewModel();
var adVm = GetValidAdvertisementItemViewModel();
IList addedItems = new ArrayList();
var collectionChangedEvent = new NotifyCollectionChangedEventHandler((sender, arg) => { addedItems = arg.NewItems; });
paperVm.Advertisements.CollectionChanged += collectionChangedEvent;
// Act
paperVm.Advertisements.Add(adVm);
// Assert
addedItems.Count.Should().Be(1, "One item was added");
adVm.Should().Be(addedItems[0]);
}
public static void OnIsAutoScrollChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
var value = (bool)e.NewValue;
var listView = obj as ListView;
var itemCollection = listView.Items;
var data = (INotifyCollectionChanged)itemCollection;
var autoscroller = new NotifyCollectionChangedEventHandler(
(o, arg) =>
{
var selectedItem = default(object);
switch (arg.Action)
{
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Move:
{
selectedItem = arg.NewItems[arg.NewItems.Count - 1];
break;
}
case NotifyCollectionChangedAction.Remove:
{
if (itemCollection.Count < arg.OldStartingIndex)
{
selectedItem = itemCollection[arg.OldStartingIndex - 1];
}
else if (itemCollection.Count > 0) selectedItem = itemCollection[0];
break;
}
case NotifyCollectionChangedAction.Reset:
{
if (itemCollection.Count > 0) selectedItem = itemCollection[0];
break;
}
}
if (selectedItem != default(object))
{
itemCollection.MoveCurrentTo(selectedItem);
listView.ScrollIntoView(selectedItem);
}
});
if (value) data.CollectionChanged += autoscroller;
else data.CollectionChanged -= autoscroller;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
private static void AssertChange(
ObservableCollection<int> original,
Action<ObservableCollection<int>> change,
ICollection copy,
NotifyCollectionChangedEventHandler handler)
{
try
{
change(original);
CollectionAssert.AreEqual(original, copy);
}
finally
{
original.CollectionChanged -= handler;
}
original.Add(42);
CollectionAssert.AreNotEqual(original, copy);
}
public static void InvokeCollectionChanged(NotifyCollectionChangedEventHandler collectionChanged, object sender, NotifyCollectionChangedEventArgs e)
{
foreach (NotifyCollectionChangedEventHandler nh in collectionChanged.GetInvocationList())
{
var dispObj = nh.Target as DispatcherObject;
if (dispObj != null)
{
Dispatcher dispatcher = dispObj.Dispatcher;
if (dispatcher != null && !dispatcher.CheckAccess())
{
NotifyCollectionChangedEventHandler nh1 = nh;
dispatcher.BeginInvoke((Action) (() => nh1.Invoke(sender, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset))),
DispatcherPriority.DataBind);
continue;
}
}
nh.Invoke(sender, IsRangeAction(e) ? new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset) : e);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ItemsSourceAdapter" /> class.
/// </summary>
public ItemsSourceAdapter([NotNull] object container, Context context, bool listenCollectionChanges, string dropDownItemTemplateSelectorName = null,
string itemTemplateSelectorName = AttachedMemberConstants.ItemTemplateSelector, string dropDownItemTemplateIdName = null,
string itemTemplateIdName = AttachedMemberConstants.ItemTemplate)
{
Should.NotBeNull(container, "container");
_container = container;
_itemTemplateProvider = new DataTemplateProvider(container, itemTemplateIdName, itemTemplateSelectorName);
_dropDownTemplateProvider = new DataTemplateProvider(container,
dropDownItemTemplateIdName ?? AttachedMembers.AdapterView.DropDownItemTemplate,
dropDownItemTemplateSelectorName ?? AttachedMembers.AdapterView.DropDownItemTemplateSelector);
_layoutInflater = context.GetBindableLayoutInflater();
if (listenCollectionChanges)
_weakHandler = ReflectionExtensions.MakeWeakCollectionChangedHandler(this, (adapter, o, arg3) => adapter.OnCollectionChanged(o, arg3));
var activityView = context.GetActivity() as IActivityView;
if (activityView != null)
{
_listener = ReflectionExtensions.CreateWeakEventHandler<ItemsSourceAdapter, EventArgs>(this, (adapter, o, arg3) => adapter.ActivityViewOnDestroyed((Activity)o));
activityView.Mediator.Destroyed += _listener.Handle;
}
}
protected override void StartListening(object source)
{
//Check if we can subscribe to the source
INotifyCollectionChanged INotify = source as INotifyCollectionChanged;
System.Diagnostics.Debug.Assert(INotify != null, "Attempt to create weak subscription to object that does not support it");
if (INotify == null)
return;
NotifyCollectionChangedEventHandler eventHandler = new NotifyCollectionChangedEventHandler(this.OnEvent);
eventHandler = ObjectToHandler.GetOrAdd(source, eventHandler);
INotify.CollectionChanged += eventHandler;
if (CleanupCountdown == 0)
{
this.ScheduleCleanup();
CleanupCountdown = 5000;
}
CleanupCountdown--;
}
public PropertyNotifier(INotifyCollectionChanged obj, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, IList changedItems)
{
this.collectionChangedObject = obj;
this.collectionChangedHandler = collectionChangedHandler;
this.collectionChangedEventArgs = new NotifyCollectionChangedEventArgs(action, changedItems);
}
public void CollectionChanged_WhenUnsubscribed_ShouldStopReceivingNotifications()
{
_realm.Write(() =>
{
_realm.Add(new OrderedObject
{
Order = 0,
IsPartOfResults = true
});
});
Exception error = null;
_realm.Error += (sender, e) =>
{
error = e.GetException();
};
var query = _realm.All <OrderedObject>().Where(o => o.IsPartOfResults).OrderBy(o => o.Order).AsRealmCollection();
var handle = GCHandle.Alloc(query); // prevent this from being collected across event loops
try
{
// wait for the initial notification to come through
TestHelpers.RunEventLoop();
var eventArgs = new List <NotifyCollectionChangedEventArgs>();
var handler = new NotifyCollectionChangedEventHandler((sender, e) =>
{
eventArgs.Add(e);
});
query.CollectionChanged += handler;
Assert.That(error, Is.Null);
_realm.Write(() =>
{
_realm.Add(new OrderedObject
{
Order = 1,
IsPartOfResults = true
});
});
TestHelpers.RunEventLoop();
Assert.That(error, Is.Null);
Assert.That(eventArgs.Count, Is.EqualTo(1));
Assert.That(eventArgs[0].Action, Is.EqualTo(NotifyCollectionChangedAction.Add));
_realm.Write(() =>
{
_realm.Add(new OrderedObject
{
Order = 2,
IsPartOfResults = true
});
});
TestHelpers.RunEventLoop();
Assert.That(error, Is.Null);
Assert.That(eventArgs.Count, Is.EqualTo(2));
Assert.That(eventArgs.All(e => e.Action == NotifyCollectionChangedAction.Add));
query.CollectionChanged -= handler;
_realm.Write(() =>
{
_realm.Add(new OrderedObject
{
Order = 3,
IsPartOfResults = true
});
});
TestHelpers.RunEventLoop();
Assert.That(error, Is.Null);
Assert.That(eventArgs.Count, Is.EqualTo(2));
Assert.That(eventArgs.All(e => e.Action == NotifyCollectionChangedAction.Add));
}
finally
{
handle.Free();
}
}
public static PropertyNotifier Notify(this INotifyCollectionChanged obj, PropertyChangingEventHandler propertyChangingHandler, PropertyChangedEventHandler propertyChangedHandler, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, object newItem, object oldItem, int index, params string[] properties)
{
return(new PropertyNotifier(obj, propertyChangingHandler, propertyChangedHandler, collectionChangedHandler, action, newItem, oldItem, index, properties));
}
/// <summary> /// Clears all <see cref="CollectionChanged"/> event handlers /// </summary> public void ClearCollectionChangedEvents() => _changed = null;
public WeakHandler(object source, NotifyCollectionChangedEventHandler originalHandler)
{
this.source = new WeakReference(source);
this.originalHandler = new WeakReference(originalHandler);
}
private static IObservable <CollectionChangedData <TItem> > ItemsPropertyChange <TCollection, TItem>(
TCollection collection,
Predicate <string> isPropertyNameRelevant)
where TCollection : IList <TItem>, INotifyCollectionChanged
{
return(Observable.Create <CollectionChangedData <TItem> >(
o =>
{
var trackedItems = new List <INotifyPropertyChanged>();
PropertyChangedEventHandler onItemChanged =
(sender, e) =>
{
if (isPropertyNameRelevant(e.PropertyName))
{
var payload = new CollectionChangedData <TItem>((TItem)sender);
o.OnNext(payload);
}
};
Action <IEnumerable <TItem> > registerItemChangeHandlers =
items =>
{
foreach (var notifier in items.OfType <INotifyPropertyChanged>())
{
trackedItems.Add(notifier);
notifier.PropertyChanged += onItemChanged;
}
};
Action <IEnumerable <TItem> > unRegisterItemChangeHandlers =
items =>
{
foreach (var notifier in items.OfType <INotifyPropertyChanged>())
{
notifier.PropertyChanged -= onItemChanged;
trackedItems.Remove(notifier);
}
};
NotifyCollectionChangedEventHandler onCollectionChanged =
(sender, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Reset)
{
foreach (var notifier in trackedItems)
{
notifier.PropertyChanged -= onItemChanged;
}
var payload = new CollectionChangedData <TItem>(trackedItems, collection);
trackedItems.Clear();
registerItemChangeHandlers(collection);
o.OnNext(payload);
}
else
{
var payload = new CollectionChangedData <TItem>(e);
unRegisterItemChangeHandlers(payload.OldItems);
registerItemChangeHandlers(payload.NewItems);
o.OnNext(payload);
}
};
registerItemChangeHandlers(collection);
collection.CollectionChanged += onCollectionChanged;
return Disposable.Create(
() =>
{
collection.CollectionChanged -= onCollectionChanged;
unRegisterItemChangeHandlers(collection);
});
}));
}
public PropertyNotifier(INotifyCollectionChanged obj, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, object newItem, object oldItem, int index)
{
this.collectionChangedObject = obj;
this.collectionChangedHandler = collectionChangedHandler;
this.collectionChangedEventArgs = new NotifyCollectionChangedEventArgs(action, newItem, oldItem, index);
}
public static PropertyNotifier Notify(this INotifyCollectionChanged obj, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, object newItem, object oldItem, int index)
{
return(new PropertyNotifier(obj, collectionChangedHandler, action, newItem, oldItem, index));
}
public static PropertyNotifier Notify(this INotifyCollectionChanged obj, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, IList newItems, IList oldItems)
{
return(new PropertyNotifier(obj, collectionChangedHandler, action, newItems, oldItems));
}
private void initializeFromSource()
{
if (_sourceNotifyCollectionChangedEventHandler != null)
{
int itemInfosCount = _itemInfos.Count;
for (int index = 0; index < itemInfosCount; index++)
{
ItemInfo itemInfo = _itemInfos[index];
ExpressionWatcher expressionWatcher = itemInfo.ExpressionWatcher;
expressionWatcher.Dispose();
}
int capacity = _sourceScalar != null?Utils.getCapacity(_sourceScalar) : Utils.getCapacity(_source);
_itemInfos = new List <ItemInfo>(capacity);
_sourcePositions = new Positions <ItemInfo>(_itemInfos);
if (_rootSourceWrapper)
{
_sourceAsList.CollectionChanged -= _sourceNotifyCollectionChangedEventHandler;
}
else
{
_sourceAsList.CollectionChanged -= _sourceWeakNotifyCollectionChangedEventHandler.Handle;
_sourceWeakNotifyCollectionChangedEventHandler = null;
}
_sourceNotifyCollectionChangedEventHandler = null;
}
_predicatePassedCount = 0;
if (_sourceScalar != null)
{
_source = _sourceScalar.Value;
}
_sourceAsList = null;
if (_source != null)
{
if (_source is ObservableCollectionWithChangeMarker <TSourceItem> sourceAsList)
{
_sourceAsList = sourceAsList;
_rootSourceWrapper = false;
}
else
{
_sourceAsList = new RootSourceWrapper <TSourceItem>(_source);
_rootSourceWrapper = true;
}
_lastProcessedSourceChangeMarker = _sourceAsList.ChangeMarkerField;
int count = _sourceAsList.Count;
for (int sourceIndex = 0; sourceIndex < count; sourceIndex++)
{
TSourceItem sourceItem = _sourceAsList[sourceIndex];
ItemInfo itemInfo = registerSourceItem(sourceItem, sourceIndex);
if (ApplyPredicate(sourceIndex))
{
_predicatePassedCount++;
itemInfo.PredicateResult = true;
}
}
_sourceNotifyCollectionChangedEventHandler = handleSourceCollectionChanged;
if (_rootSourceWrapper)
{
_sourceAsList.CollectionChanged += _sourceNotifyCollectionChangedEventHandler;
}
else
{
_sourceWeakNotifyCollectionChangedEventHandler =
new WeakNotifyCollectionChangedEventHandler(_sourceNotifyCollectionChangedEventHandler);
_sourceAsList.CollectionChanged += _sourceWeakNotifyCollectionChangedEventHandler.Handle;
}
calculateValue();
}
else
{
if (_value)
{
setValue(false);
}
}
}
/// <summary>
/// Invokes an action for each item in a collection and subsequently each item added or
/// removed from the collection.
/// </summary>
/// <typeparam name="T">The type of the collection items.</typeparam>
/// <param name="collection">The collection.</param>
/// <param name="added">
/// An action called initially for each item in the collection and subsequently for each
/// item added to the collection. The parameters passed are the index in the collection and
/// the item.
/// </param>
/// <param name="removed">
/// An action called for each item removed from the collection. The parameters passed are
/// the index in the collection and the item.
/// </param>
/// <param name="reset">
/// An action called when the collection is reset. This will be followed by calls to
/// <paramref name="added"/> for each item present in the collection after the reset.
/// </param>
/// <param name="weakSubscription">
/// Indicates if a weak subscription should be used to track changes to the collection.
/// </param>
/// <returns>A disposable used to terminate the subscription.</returns>
public static IDisposable ForEachItem <T>(
this IAvaloniaReadOnlyList <T> collection,
Action <int, T> added,
Action <int, T> removed,
Action reset,
bool weakSubscription = false)
{
void Add(int index, IList items)
{
foreach (T item in items)
{
added(index++, item);
}
}
void Remove(int index, IList items)
{
for (var i = items.Count - 1; i >= 0; --i)
{
removed(index + i, (T)items[i]);
}
}
NotifyCollectionChangedEventHandler handler = (_, e) =>
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
Add(e.NewStartingIndex, e.NewItems);
break;
case NotifyCollectionChangedAction.Move:
case NotifyCollectionChangedAction.Replace:
Remove(e.OldStartingIndex, e.OldItems);
Add(e.NewStartingIndex, e.NewItems);
break;
case NotifyCollectionChangedAction.Remove:
Remove(e.OldStartingIndex, e.OldItems);
break;
case NotifyCollectionChangedAction.Reset:
if (reset == null)
{
throw new InvalidOperationException(
"Reset called on collection without reset handler.");
}
reset();
Add(0, (IList)collection);
break;
}
};
Add(0, (IList)collection);
if (weakSubscription)
{
return(collection.WeakSubscribe(handler));
}
else
{
collection.CollectionChanged += handler;
return(Disposable.Create(() => collection.CollectionChanged -= handler));
}
}
public ObservableList() : base()
{
CollectionChanged += new NotifyCollectionChangedEventHandler(nObservableCollection_CollectionChanged);
}
void RunView(UIViewType viewType, ViewWithData arg = null)
{
if (requestedTarget?.ViewType == viewType || (requestedTarget?.ViewType == UIViewType.None && requestedTarget?.MainFlow == CurrentFlow))
{
arg = requestedTarget;
}
if (arg == null)
{
arg = new ViewWithData {
ActiveFlow = activeFlow, MainFlow = selectedFlow, ViewType = viewType
}
}
;
bool firstTime = CreateViewAndViewModel(viewType, arg);
var view = GetObjectsForFlow(activeFlow)[viewType].View;
transition.OnNext(new LoadData
{
Flow = activeFlow,
View = view,
Data = arg
});
// controller might have been stopped in the OnNext above
if (IsStopped)
{
return;
}
// if it's not the first time we've shown this view, no need
// to set it up
if (!firstTime)
{
return;
}
SetupView(viewType, view.ViewModel);
}
void SetupView(UIViewType viewType, IViewModel viewModel)
{
var list = GetObjectsForFlow(activeFlow);
var pair = list[viewType];
var hasDone = viewModel as IHasDone;
var hasCancel = viewModel as IHasCancel;
// 2FA is set up when login is set up, so nothing to do
if (viewType == UIViewType.TwoFactor)
{
return;
}
// we're setting up the login dialog, we need to setup the 2fa as
// well to continue the flow if it's needed, since the
// authenticationresult callback won't happen until
// everything is done
if (viewType == UIViewType.Login)
{
var pair2fa = list[UIViewType.TwoFactor];
pair2fa.AddHandler(((IDialogViewModel)pair2fa.ViewModel).WhenAny(x => x.IsShowing, x => x.Value)
.Where(x => x)
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => Fire(Trigger.Next)));
pair2fa.AddHandler(((IHasCancel)pair2fa.ViewModel).Cancel
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => Fire(uiStateMachine.CanFire(Trigger.Cancel) ? Trigger.Cancel : Trigger.Finish)));
if (hasDone != null)
{
pair.AddHandler(hasDone.Done
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => Fire(Trigger.Finish)));
}
}
else if (hasDone != null)
{
pair.AddHandler(hasDone.Done
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => Fire(uiStateMachine.CanFire(Trigger.Next) ? Trigger.Next : Trigger.Finish)));
}
if (hasCancel != null)
{
pair.AddHandler(hasCancel.Cancel
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => Fire(uiStateMachine.CanFire(Trigger.Cancel) ? Trigger.Cancel : Trigger.Finish)));
}
}
/// <summary>
/// Creates View/ViewModel instances for the specified <paramref name="viewType"/> if they
/// haven't been created yet in the current flow
/// </summary>
/// <param name="viewType"></param>
/// <returns>true if the View/ViewModel didn't exist and had to be created</returns>
bool CreateViewAndViewModel(UIViewType viewType, ViewWithData data = null)
{
var list = GetObjectsForFlow(activeFlow);
if (viewType == UIViewType.Login)
{
if (!list.ContainsKey(viewType))
{
var d = factory.CreateViewAndViewModel(UIViewType.TwoFactor);
list.Add(UIViewType.TwoFactor, d);
}
}
// 2fa view/viewmodel is created when login is created 'cause login needs the 2fa viewmodel
// so the only thing we want to do is connect the viewmodel to the view when it's showing
else if (viewType == UIViewType.TwoFactor)
{
var d = list[viewType];
if (d.View.ViewModel == null)
{
d.ViewModel.Initialize(data);
d.View.DataContext = d.ViewModel;
}
}
IUIPair pair = null;
var firstTime = !list.TryGetValue(viewType, out pair);
if (firstTime)
{
pair = factory.CreateViewAndViewModel(viewType);
}
pair.ViewModel.Initialize(data);
if (firstTime)
{
pair.View.DataContext = pair.ViewModel;
list.Add(viewType, pair);
}
return(firstTime);
}
/// <summary>
/// Returns the view/viewmodel pair for a given flow
/// </summary>
Dictionary <UIViewType, IUIPair> GetObjectsForFlow(UIControllerFlow flow)
{
Dictionary <UIViewType, IUIPair> list;
if (!uiObjects.TryGetValue(flow, out list))
{
list = new Dictionary <UIViewType, IUIPair>();
uiObjects.Add(flow, list);
}
return(list);
}
void Fire(Trigger next, ViewWithData arg = null)
{
Debug.WriteLine("Firing {0} from {1} ({2})", next, uiStateMachine.State, GetHashCode());
if (triggers.ContainsKey(next))
{
uiStateMachine.Fire(triggers[next], arg);
}
else
{
uiStateMachine.Fire(next);
}
}
UIViewType Go(Trigger trigger)
{
return(Go(trigger, activeFlow));
}
UIViewType Go(Trigger trigger, UIControllerFlow flow)
{
var m = machines[flow];
Debug.WriteLine("Firing {0} from {1} for flow {2} ({3})", trigger, m.State, flow, GetHashCode());
m.Fire(trigger);
return(m.State);
}
void Reset()
{
if (connectionAdded != null)
{
connectionManager.Connections.CollectionChanged -= connectionAdded;
}
connectionAdded = null;
var tr = transition;
var cmp = completion;
transition = null;
completion = null;
disposables.Clear();
tr?.Dispose();
cmp?.Dispose();
stopping = false;
connection = null;
}
bool disposed; // To detect redundant calls
public void Start()
{
if (connection != null)
{
if (selectedFlow != UIControllerFlow.Authentication)
{
gitHubServiceProvider.AddService(this, connection);
}
else // sanity check: it makes zero sense to pass a connection in when calling the auth flow
{
Debug.Assert(false, "Calling the auth flow with a connection makes no sense!");
}
connection.Login()
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => { }, () =>
{
Debug.WriteLine("Start ({0})", GetHashCode());
Fire(Trigger.Next);
});
}
else
{
connectionManager
.GetLoggedInConnections(hosts)
.FirstOrDefaultAsync()
.Select(c =>
{
bool loggedin = c != null;
if (selectedFlow != UIControllerFlow.Authentication)
{
if (loggedin) // register the first available connection so the viewmodel can use it
{
connection = c;
gitHubServiceProvider.AddService(this, c);
}
else
{
// a connection will be added to the list when auth is done, register it so the next
// viewmodel can use it
connectionAdded = (s, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
connection = e.NewItems[0] as IConnection;
if (connection != null)
{
gitHubServiceProvider.AddService(typeof(IConnection), this, connection);
}
}
};
connectionManager.Connections.CollectionChanged += connectionAdded;
}
}
return(loggedin);
})
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(_ => { }, () =>
{
Debug.WriteLine("Start ({0})", GetHashCode());
Fire(Trigger.Next);
});
}
}
public static IObservable <NotifyCollectionChangedEventArgs> WhenCollectionChanged(this INotifyCollectionChanged collection) => Observable.Create <NotifyCollectionChangedEventArgs>(ob =>
{
var handler = new NotifyCollectionChangedEventHandler((sender, args) => ob.OnNext(args));
collection.CollectionChanged += handler;
return(() => collection.CollectionChanged -= handler);
});
public PropertyNotifier(INotifyCollectionChanged obj, PropertyChangingEventHandler propertyChangingHandler, PropertyChangedEventHandler propertyChangedHandler, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, object newItem, object oldItem, int index, params string[] properties)
{
this.collectionChangedObject = obj;
this.collectionChangedHandler = collectionChangedHandler;
this.collectionChangedEventArgs = new NotifyCollectionChangedEventArgs(action, newItem, oldItem, index);
}
public DeeplyObservableCollection()
: base()
{
CollectionChanged += new NotifyCollectionChangedEventHandler(DeeplyObservableCollection_CollectionChanged);
}
/// <summary>
/// Constructors
/// </summary>
public ObservableCollectionEx() : base()
{
CollectionChanged += new NotifyCollectionChangedEventHandler(ObservableCollectionEx_CollectionChanged);
}
public static PropertyNotifier Notify(this INotifyCollectionChanged obj, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, IList changedItems, int index, int oldIndex)
{
return(new PropertyNotifier(obj, collectionChangedHandler, action, changedItems, index, oldIndex));
}
public ItemsSourceTableViewSource([NotNull] UITableView tableView,
string itemTemplate = AttachedMemberConstants.ItemTemplate)
: base(tableView, itemTemplate)
{
_weakHandler = ReflectionExtensions.MakeWeakCollectionChangedHandler(this, (adapter, o, arg3) => adapter.OnCollectionChanged(o, arg3));
}
public static PropertyNotifier Notify(this INotifyCollectionChanged obj, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, object changedItem)
{
return(new PropertyNotifier(obj, collectionChangedHandler, action, changedItem));
}
private void initializeFromSources()
{
if (_outerSourceNotifyCollectionChangedEventHandler != null)
{
_outerSource.CollectionChanged -= _outerSourceWeakNotifyCollectionChangedEventHandler.Handle;
_outerSourceNotifyCollectionChangedEventHandler = null;
_outerSourceWeakNotifyCollectionChangedEventHandler = null;
}
if (_innerSourceNotifyCollectionChangedEventHandler != null)
{
_innerSource.CollectionChanged -= _innerSourceWeakNotifyCollectionChangedEventHandler.Handle;
_innerSourceNotifyCollectionChangedEventHandler = null;
_innerSourceWeakNotifyCollectionChangedEventHandler = null;
}
if (_innerSourceAsINotifyPropertyChanged != null)
{
_innerSourceAsINotifyPropertyChanged.PropertyChanged -=
_innerSourceWeakPropertyChangedEventHandler.Handle;
_innerSourceAsINotifyPropertyChanged = null;
_innerSourcePropertyChangedEventHandler = null;
_innerSourceWeakPropertyChangedEventHandler = null;
}
if (_outerSourceAsINotifyPropertyChanged != null)
{
_outerSourceAsINotifyPropertyChanged.PropertyChanged -=
_outerSourceWeakPropertyChangedEventHandler.Handle;
_outerSourceAsINotifyPropertyChanged = null;
_outerSourcePropertyChangedEventHandler = null;
_outerSourceWeakPropertyChangedEventHandler = null;
}
if (_outerSource != null || _innerSource != null)
{
baseClearItems();
}
if (_outerSourceScalar != null)
{
_outerSource = _outerSourceScalar.Value;
}
_outerSourceAsList = (IList <TOuterSourceItem>)_outerSource;
if (_innerSourceScalar != null)
{
_innerSource = _innerSourceScalar.Value;
}
_innerSourceAsList = (IList <TInnerSourceItem>)_innerSource;
if (_outerSource != null && _innerSource != null)
{
_outerSourceAsObservableCollectionWithChangeMarker = _outerSourceAsList as ObservableCollectionWithChangeMarker <TOuterSourceItem>;
if (_outerSourceAsObservableCollectionWithChangeMarker != null)
{
_lastProcessedOuterSourceChangeMarker = _outerSourceAsObservableCollectionWithChangeMarker.ChangeMarkerField;
}
else
{
_outerSourceAsINotifyPropertyChanged = (INotifyPropertyChanged)_outerSource;
_outerSourcePropertyChangedEventHandler = (sender, args) =>
{
if (args.PropertyName == "Item[]")
{
_outerSourceIndexerPropertyChangedEventRaised = true; // ObservableCollection raises this before CollectionChanged event raising
}
};
_outerSourceWeakPropertyChangedEventHandler =
new WeakPropertyChangedEventHandler(_outerSourcePropertyChangedEventHandler);
_outerSourceAsINotifyPropertyChanged.PropertyChanged +=
_outerSourceWeakPropertyChangedEventHandler.Handle;
}
_innerSourceAsObservableCollectionWithChangeMarker = _innerSourceAsList as ObservableCollectionWithChangeMarker <TInnerSourceItem>;
if (_innerSourceAsObservableCollectionWithChangeMarker != null)
{
_lastProcessedInnerSourceChangeMarker = _innerSourceAsObservableCollectionWithChangeMarker.ChangeMarkerField;
}
else
{
_innerSourceAsINotifyPropertyChanged = (INotifyPropertyChanged)_innerSource;
_innerSourcePropertyChangedEventHandler = (sender, args) =>
{
if (args.PropertyName == "Item[]")
{
_innerSourceIndexerPropertyChangedEventRaised = true; // ObservableCollection raises this before CollectionChanged event raising
}
};
_innerSourceWeakPropertyChangedEventHandler =
new WeakPropertyChangedEventHandler(_innerSourcePropertyChangedEventHandler);
_innerSourceAsINotifyPropertyChanged.PropertyChanged +=
_innerSourceWeakPropertyChangedEventHandler.Handle;
}
// ReSharper disable once PossibleNullReferenceException
int outerSourceCount = _outerSourceAsList.Count;
// ReSharper disable once PossibleNullReferenceException
int innerSourceCount = _innerSourceAsList.Count;
int baseIndex = 0;
for (int outerSourceIndex = 0; outerSourceIndex < outerSourceCount; outerSourceIndex++)
{
TOuterSourceItem sourceOuterItem = _outerSourceAsList[outerSourceIndex];
for (int innerSourceIndex = 0; innerSourceIndex < innerSourceCount; innerSourceIndex++)
{
TInnerSourceItem sourceInnerItem = _innerSourceAsList[innerSourceIndex];
JoinPair <TOuterSourceItem, TInnerSourceItem> joinPair = new JoinPair <TOuterSourceItem, TInnerSourceItem>(
sourceOuterItem, sourceInnerItem);
baseInsertItem(baseIndex + innerSourceIndex, joinPair);
}
baseIndex = baseIndex + innerSourceCount;
}
_outerSourceNotifyCollectionChangedEventHandler = handleOuterSourceCollectionChanged;
_outerSourceWeakNotifyCollectionChangedEventHandler =
new WeakNotifyCollectionChangedEventHandler(_outerSourceNotifyCollectionChangedEventHandler);
_outerSource.CollectionChanged += _outerSourceWeakNotifyCollectionChangedEventHandler.Handle;
_innerSourceNotifyCollectionChangedEventHandler = handleInnerSourceCollectionChanged;
_innerSourceWeakNotifyCollectionChangedEventHandler =
new WeakNotifyCollectionChangedEventHandler(_innerSourceNotifyCollectionChangedEventHandler);
_innerSource.CollectionChanged += _innerSourceWeakNotifyCollectionChangedEventHandler.Handle;
}
}
public PropertyNotifier(INotifyCollectionChanged obj, PropertyChangingEventHandler propertyChangingHandler, PropertyChangedEventHandler propertyChangedHandler, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, IList changedItems, int startingIndex, params string[] properties)
{
this.collectionChangedObject = obj;
this.collectionChangedHandler = collectionChangedHandler;
this.collectionChangedEventArgs = new NotifyCollectionChangedEventArgs(action, changedItems, startingIndex);
}
public VisualElementTracker()
{
_collectionChangedHandler = ModelGestureRecognizersOnCollectionChanged;
}
public PropertyNotifier(INotifyCollectionChanged obj, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, IList newItems, IList oldItems, int startingIndex)
{
this.collectionChangedObject = obj;
this.collectionChangedHandler = collectionChangedHandler;
this.collectionChangedEventArgs = new NotifyCollectionChangedEventArgs(action, newItems, oldItems, startingIndex);
}
public void CustomCollectionTest()
{
var originalCollection = new CustomCollection <MyModel>(true)
{
new MyModel(),
new MyModel(),
new MyModel()
};
using var synchronizingCollection = new SynchronizingCollectionCore <MyDataModel, MyModel>(
originalCollection, m => new MyDataModel(m));
AssertHelper.SequenceEqual(originalCollection, synchronizingCollection.Select(dm => dm.Model));
// Check add operation with collection changed event.
bool handlerCalled = false;
NotifyCollectionChangedEventHandler handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(3, e.NewStartingIndex);
Assert.AreEqual(originalCollection.Last(), e.NewItems.Cast <MyDataModel>().Single().Model);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Add(new MyModel());
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
// Compare the collections
AssertHelper.SequenceEqual(originalCollection, synchronizingCollection.Select(dm => dm.Model));
// Check remove operation with collection changed event.
MyModel itemToRemove = originalCollection[2];
handlerCalled = false;
handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Remove, e.Action);
Assert.AreEqual(2, e.OldStartingIndex);
Assert.AreEqual(itemToRemove, e.OldItems.Cast <MyDataModel>().Single().Model);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Remove(itemToRemove);
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
// Check replace operation with collection changed event.
MyModel itemToReplace = originalCollection[1];
int handlerCalledCount = 0;
handler = (sender, e) =>
{
Assert.AreEqual(synchronizingCollection, sender);
if (handlerCalledCount == 0)
{
Assert.AreEqual(NotifyCollectionChangedAction.Remove, e.Action);
Assert.AreEqual(itemToReplace, e.OldItems.Cast <MyDataModel>().Single().Model);
}
else
{
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(originalCollection[1], e.NewItems.Cast <MyDataModel>().Single().Model);
}
handlerCalledCount++;
};
synchronizingCollection.CollectionChanged += handler;
originalCollection[1] = new MyModel();
synchronizingCollection.CollectionChanged -= handler;
Assert.AreEqual(2, handlerCalledCount);
// Check reset operation with collection changed event.
var newItems = new List <MyModel>()
{
new MyModel(),
new MyModel()
};
handlerCalledCount = 0;
handler = (sender, e) =>
{
Assert.AreEqual(synchronizingCollection, sender);
if (handlerCalledCount == 0)
{
Assert.AreEqual(NotifyCollectionChangedAction.Reset, e.Action);
}
else
{
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
}
handlerCalledCount++;
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Reset(newItems);
synchronizingCollection.CollectionChanged -= handler;
Assert.AreEqual(3, handlerCalledCount);
AssertHelper.SequenceEqual(newItems, synchronizingCollection.Select(dm => dm.Model));
}
public void ObservableCollectionTest()
{
var originalCollection = new ObservableCollection <MyModel>()
{
new MyModel(),
new MyModel(),
new MyModel()
};
using var synchronizingCollection = new SynchronizingCollectionCore <MyDataModel, MyModel>(originalCollection, m => new MyDataModel(m));
AssertHelper.SequenceEqual(originalCollection, synchronizingCollection.Select(dm => dm.Model));
// Check add operation with collection changed event.
bool handlerCalled = false;
NotifyCollectionChangedEventHandler handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(3, e.NewStartingIndex);
Assert.AreEqual(originalCollection.Last(), e.NewItems.Cast <MyDataModel>().Single().Model);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Add(new MyModel());
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
// Check insert at index 0 operation with collection changed event.
handlerCalled = false;
handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(0, e.NewStartingIndex);
Assert.AreEqual(originalCollection[0], e.NewItems.Cast <MyDataModel>().Single().Model);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Insert(0, new MyModel());
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
// Compare the collections
AssertHelper.SequenceEqual(originalCollection, synchronizingCollection.Select(dm => dm.Model));
// Check remove operation with collection changed event.
MyModel itemToRemove = originalCollection[2];
handlerCalled = false;
handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Remove, e.Action);
Assert.AreEqual(2, e.OldStartingIndex);
Assert.AreEqual(itemToRemove, e.OldItems.Cast <MyDataModel>().Single().Model);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Remove(itemToRemove);
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
// Check replace operation with collection changed event.
MyModel itemToReplace = originalCollection[1];
handlerCalled = false;
handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Replace, e.Action);
Assert.AreEqual(1, e.NewStartingIndex);
Assert.AreEqual(1, e.OldStartingIndex);
Assert.AreEqual(originalCollection[1], e.NewItems.Cast <MyDataModel>().Single().Model);
Assert.AreEqual(itemToReplace, e.OldItems.Cast <MyDataModel>().Single().Model);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection[1] = new MyModel();
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
// Check move operation with collection changed event.
handlerCalled = false;
handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Move, e.Action);
Assert.AreEqual(0, e.OldStartingIndex);
Assert.AreEqual(2, e.NewStartingIndex);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Move(0, 2);
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
// Check clear operation with collection changed event.
handlerCalled = false;
handler = (sender, e) =>
{
handlerCalled = true;
Assert.AreEqual(synchronizingCollection, sender);
Assert.AreEqual(NotifyCollectionChangedAction.Reset, e.Action);
};
synchronizingCollection.CollectionChanged += handler;
originalCollection.Clear();
synchronizingCollection.CollectionChanged -= handler;
Assert.IsTrue(handlerCalled);
Assert.IsFalse(synchronizingCollection.Any());
}
public static PropertyNotifier Notify(this INotifyCollectionChanged obj, PropertyChangingEventHandler propertyChangingHandler, PropertyChangedEventHandler propertyChangedHandler, NotifyCollectionChangedEventHandler collectionChangedHandler, NotifyCollectionChangedAction action, IList changedItems, int index, int oldIndex, params string[] properties)
{
return(new PropertyNotifier(obj, propertyChangingHandler, propertyChangedHandler, collectionChangedHandler, action, changedItems.Cast <object>().ToList(), index, oldIndex, properties));
}
protected ItemsSourceGeneratorBase()
{
_handler = ReflectionExtensions.MakeWeakCollectionChangedHandler(this, (@base, o, arg3) => @base.OnCollectionChanged(arg3));
}
public ObservableCollectionEx(IEnumerable <T> l) : base(l)
{
CollectionChanged += new NotifyCollectionChangedEventHandler(ObservableCollectionEx_CollectionChanged);
}
