public void FilteredObservableCollection_Add_RaisesCollectionChangedForUnfilteredItems()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
var changedItems = new List <int>();
void collectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
changedItems.AddRange(e.NewItems.Cast <int>());
}
}
filteredCollection.CollectionChanged += collectionChanged;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
filteredCollection.CollectionChanged -= collectionChanged;
Assert.AreEqual(3, changedItems.Count);
Assert.AreEqual(5, changedItems[0]);
Assert.AreEqual(7, changedItems[1]);
Assert.AreEqual(17, changedItems[2]);
}
public void FilteredObservableCollection_FilterChanged_RaisesCollectionChangedForUnfilteredItems()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
var collectionChangedRaisedCounter = 0;
void collectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Reset)
{
collectionChangedRaisedCounter++;
}
}
filteredCollection.CollectionChanged += collectionChanged;
filteredCollection.Filter = item => item != 17;
filteredCollection.Filter = item => item != 17;
filteredCollection.Filter = item => item != 13;
filteredCollection.CollectionChanged -= collectionChanged;
Assert.AreEqual(3, collectionChangedRaisedCounter);
}
public void FilteredObservableCollection_Remove_RaisesCollectionChangedForUnfilteredItems()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
var changedItems = new List <int>();
void collectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Remove)
{
changedItems.AddRange(e.OldItems.Cast <int>());
}
}
filteredCollection.CollectionChanged += collectionChanged;
filteredCollection.Remove(13);
filteredCollection.Remove(7);
filteredCollection.Remove(11); // Not even contained!
filteredCollection.Remove(17);
filteredCollection.CollectionChanged -= collectionChanged;
Assert.AreEqual(2, changedItems.Count);
Assert.AreEqual(7, changedItems[0]);
Assert.AreEqual(17, changedItems[1]);
}
public void FilteredObservableCollection_FilterChanged_RaisesPropertyChangedOnCountForUnfilteredItems()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
var propertyChangedRaisedCounter = 0;
void propertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == nameof(filteredCollection.Count))
{
propertyChangedRaisedCounter++;
}
}
filteredCollection.PropertyChanged += propertyChanged;
filteredCollection.Filter = item => item != 13 && item != 17; // Count 1 -> 2: Raises PropertyChanged
filteredCollection.Filter = item => item != 15 && item != 7; // Count 2 -> 2: Doea not raise PropertyChanged
filteredCollection.Filter = item => item != 17; // Count 2 -> 1: Raises PropertyChanged
filteredCollection.PropertyChanged -= propertyChanged;
Assert.AreEqual(2, propertyChangedRaisedCounter);
}
public void FilteredObservableCollection_Clear_RaisesPropertyChanged()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
var propertyChangedRaisedCounter = 0;
void propertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == nameof(filteredCollection.Count))
{
propertyChangedRaisedCounter++;
}
}
filteredCollection.PropertyChanged += propertyChanged;
filteredCollection.Clear();
filteredCollection.PropertyChanged -= propertyChanged;
Assert.AreEqual(1, propertyChangedRaisedCounter);
}
public void FilteredObservableCollection_Remove_RemovesItem()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Add("Item 1");
filteredCollection.Add("Item 2");
filteredCollection.Add("Item 3");
Assert.IsTrue(filteredCollection.Remove("Item 2"));
Assert.AreEqual("Item 1", filteredCollection.First());
Assert.AreEqual("Item 3", filteredCollection.Last());
}
public void FilteredObservableCollection_Clear_RemovesAllItems()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Add("Item 1");
filteredCollection.Add("Item 2");
filteredCollection.Add("Item 3");
filteredCollection.Clear();
foreach (var item in filteredCollection)
{
Assert.Fail("Collection must not contain items after Clear()!");
}
}
public void BasicUsage()
{
_target.Add("aaa");
_target.Add("axa");
_target.Add("bbb");
_target.Add("bxb");
_target.Is("aaa", "bbb");
_collectionChanged.SelectMany(x => x.NewItems.Cast <string>())
.Is("aaa", "bbb");
_collectionChanged.Select(x => x.Action)
.Is(
NotifyCollectionChangedAction.Add,
NotifyCollectionChangedAction.Add
);
}
public void FilteredObservableCollection_WithFilter_ItemsAreFiltered()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
Assert.AreEqual(3, filteredCollection.Count);
Assert.AreEqual(5, filteredCollection.First());
Assert.AreEqual(7, filteredCollection.ElementAt(1));
Assert.AreEqual(17, filteredCollection.ElementAt(2));
}
public void FilteredObservableCollection_Count_ShowsItemCount()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Add("Item 1");
Assert.AreEqual(1, filteredCollection.Count);
filteredCollection.Add("Item 2");
filteredCollection.Add("Item 3");
Assert.AreEqual(3, filteredCollection.Count);
filteredCollection.Remove("Item 2");
Assert.AreEqual(2, filteredCollection.Count);
filteredCollection.Clear();
Assert.AreEqual(0, filteredCollection.Count);
}
public void FilteredObservableCollection_Count_ShowsCorrectItemCount()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Add("Item 1");
Assert.AreEqual("Item 1", filteredCollection.First());
}
public void FilteredObservableCollection_Add_AddsItem()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Add("Item 1");
Assert.AreEqual("Item 1", filteredCollection.First());
}
public void FilteredObservableCollection_FilterChanged_ItemsAreFilteredByNewFilter()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Filter = item => item != "Filter me!";
filteredCollection.Add("Not me");
filteredCollection.Add("Nor me");
filteredCollection.Add("Filter me!");
filteredCollection.Add("But not me");
Assert.AreEqual(3, filteredCollection.Count);
Assert.AreEqual("Not me", filteredCollection.First());
Assert.AreEqual("Nor me", filteredCollection.ElementAt(1));
Assert.AreEqual("But not me", filteredCollection.ElementAt(2));
filteredCollection.Filter = item => !item.StartsWith("No");
Assert.AreEqual(2, filteredCollection.Count);
Assert.AreEqual("Filter me!", filteredCollection.First());
Assert.AreEqual("But not me", filteredCollection.Last());
}