protected override async Task InitializeAsync()
{
await base.InitializeAsync();
var items = await TodoStorage.GetItemsAsync();
using (_todoItems.SuspendChangeNotifications())
{
_todoItems.ReplaceRange(items);
}
}
public void HandlesCollectionChangesCorrectlyInSuspensionModeMixedConsolidate()
{
var collection = new FastObservableCollection <TestModel>
{
AutomaticallyDispatchChangeNotifications = false
};
var wrapper = new ChangeNotificationWrapper(collection);
var itemsReset = false;
var itemsAdded = false;
var itemsRemoved = false;
var model = new TestModel();
collection.Add(model);
wrapper.CollectionChanged += (sender, e) =>
{
if (e.OldItems != null)
{
itemsRemoved = true;
}
if (e.Action == NotifyCollectionChangedAction.Reset)
{
itemsReset = true;
}
if (e.NewItems != null)
{
itemsAdded = true;
}
};
using (collection.SuspendChangeNotifications(SuspensionMode.MixedConsolidate))
{
collection.ReplaceRange(new [] { new TestModel() });
}
Assert.IsTrue(itemsAdded, "Items should be added");
Assert.IsTrue(itemsRemoved, "Items should be removed");
Assert.IsFalse(itemsReset, "Items should not be reset");
}
public void HandlesCollectionChangesByResetCorrectly()
{
var collection = new FastObservableCollection <TestModel>();
var wrapper = new ChangeNotificationWrapper(collection);
var itemsReset = false;
var itemsAdded = false;
var itemsRemoved = false;
var model = new TestModel();
collection.Add(model);
wrapper.CollectionChanged += (sender, e) =>
{
if (e.OldItems != null)
{
itemsRemoved = true;
}
if (e.Action == NotifyCollectionChangedAction.Reset)
{
itemsReset = true;
}
if (e.NewItems != null)
{
itemsAdded = true;
}
};
using (collection.SuspendChangeNotifications())
{
collection.ReplaceRange(new [] { new TestModel() });
}
Assert.IsFalse(itemsAdded);
Assert.IsFalse(itemsRemoved);
Assert.IsTrue(itemsReset);
}
public void HandlesCollectionChangesByResetCorrectly()
{
var collection = new FastObservableCollection<TestModel>();
var wrapper = new ChangeNotificationWrapper(collection);
var itemsReset = false;
var itemsAdded = false;
var itemsRemoved = false;
var model = new TestModel();
collection.Add(model);
wrapper.CollectionChanged += (sender, e) =>
{
if (e.OldItems != null)
{
itemsRemoved = true;
}
if (e.Action == NotifyCollectionChangedAction.Reset)
{
itemsReset = true;
}
if (e.NewItems != null)
{
itemsAdded = true;
}
};
using (collection.SuspendChangeNotifications())
{
collection.ReplaceRange(new [] { new TestModel() });
}
Assert.IsFalse(itemsAdded);
Assert.IsFalse(itemsRemoved);
Assert.IsTrue(itemsReset);
}
