public void CanRemoveAndInsertItemsInRealizedRange()
{
RunOnUIThread.Execute(() =>
{
var dataSource = new CustomItemsSource(Enumerable.Range(0, 3).ToList());
var repeater = SetupRepeater(dataSource);
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
Log.Comment("Remove index 1 in realized range");
dataSource.Remove(index: 1, count: 1, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(2, realized);
Log.Comment("Add 5 items at index 1");
dataSource.Insert(index: 1, count: 5, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
});
}
public void ValidateInserts()
{
RunOnUIThread.Execute(() =>
{
var dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList());
var repeater = SetupRepeater(dataSource);
Log.Comment("Insert in realized range: Inserting 3 items at index 4");
dataSource.Insert(index: 4, count: 3, reset: false);
repeater.UpdateLayout();
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsGreaterThan(realized, 0);
Log.Comment("Insert before realized range: Inserting 3 items at index 0");
dataSource.Insert(index: 0, count: 3, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsGreaterThan(realized, 0);
Log.Comment("Insert after realized range: Inserting 3 items at index 10");
dataSource.Insert(index: 10, count: 3, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsGreaterThan(realized, 0);
});
}
public void CanRemoveItemsStartingInRealizedRange()
{
RunOnUIThread.Execute(() =>
{
var dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList());
var repeater = SetupRepeater(dataSource);
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
Log.Comment("Remove in realized range: start:(1)InView end:(3)InView.");
dataSource.Remove(index: 1, count: 3, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
Log.Comment("Remove in realized range: start:(1)InView end:(6)InView.");
dataSource.Remove(index: 1, count: 6, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(1, realized);
});
}
public void CanRemoveItemsStartingBeforeRealizedRange()
{
CustomItemsSource dataSource = null;
RunOnUIThread.Execute(() => dataSource = new CustomItemsSource(Enumerable.Range(0, 20).ToList()));
ScrollViewer scrollViewer = null;
ItemsRepeater repeater = null;
var viewChangedEvent = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
repeater = SetupRepeater(dataSource, ref scrollViewer);
scrollViewer.ViewChanged += (sender, args) =>
{
if (!args.IsIntermediate)
{
viewChangedEvent.Set();
}
};
scrollViewer.ChangeView(null, 600, null, true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTime), "Waiting for ViewChanged.");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Log.Comment("Remove before realized range: start:(0)beforeView end:(1)beforeView.");
dataSource.Remove(index: 0, count: 2, reset: false);
repeater.UpdateLayout();
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
Log.Comment("Remove before realized range: start:(0)beforeView end:(4)inview.");
dataSource.Remove(index: 0, count: 5, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
Log.Comment("Insert before realized range: Inserting 10 items at index 0");
dataSource.Insert(index: 0, count: 10, reset: false);
repeater.UpdateLayout();
VerifyRealizedRange(repeater, dataSource);
Log.Comment("Insert after realized range: Inserting 10 items at index 19");
dataSource.Insert(index: 19, count: 10, reset: false);
repeater.UpdateLayout();
VerifyRealizedRange(repeater, dataSource);
Log.Comment("Remove before realized range: start:(5)beforeView end:(25)afterView.");
dataSource.Remove(index: 5, count: 20, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsLessThanOrEqual(3, realized);
});
}
private int VerifyRealizedRange(ItemsRepeater repeater, CustomItemsSource dataSource)
{
int numRealized = 0;
// trace
Log.Comment("index:ItemsSourceView:Item");
for (int i = 0; i < dataSource.Inner.Count; i++)
{
var element = repeater.TryGetElement(i);
if (element != null)
{
var data = ((TextBlock)element).Text;
Log.Comment("{0} {1}:[{2}]", i, dataSource.GetAt(i), data);
numRealized++;
}
else
{
Log.Comment(i + ":[null]");
}
}
// verify
for (int i = 0; i < dataSource.Inner.Count; i++)
{
var element = repeater.TryGetElement(i);
if (element != null)
{
var data = ((TextBlock)element).Text;
Verify.AreEqual(dataSource.GetAt(i).ToString(), data);
}
}
return(numRealized);
}
private ItemsRepeater SetupRepeater(CustomItemsSource dataSource, ElementFactory elementFactory, ref ScrollViewer scrollViewer, VirtualizingLayout layout)
{
var repeater = new ItemsRepeater()
{
ItemsSource = dataSource,
ItemTemplate = elementFactory,
Layout = layout,
VerticalCacheLength = 0,
HorizontalCacheLength = 0
};
scrollViewer = new ScrollViewer
{
Content = repeater
};
Content = new ItemsRepeaterScrollHost()
{
Width = 200,
Height = 200,
ScrollViewer = scrollViewer
};
Content.UpdateLayout();
if (dataSource.Count > 0)
{
int realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsGreaterThan(realized, 0);
}
return(repeater);
}
private ItemsRepeater SetupRepeater(CustomItemsSource dataSource, ElementFactory elementFactory, ref ScrollViewer scrollViewer, VirtualizingLayout layout)
{
var repeater = new ItemsRepeater()
{
ItemsSource = dataSource,
#if BUILD_WINDOWS
ItemTemplate = (Windows.UI.Xaml.IElementFactory)elementFactory,
#else
ItemTemplate = elementFactory,
#endif
Layout = layout,
VerticalCacheLength = 0,
HorizontalCacheLength = 0
};
scrollViewer = new ScrollViewer
{
Content = repeater
};
Content = new ScrollAnchorProvider()
{
Width = 200,
Height = 200,
Content = scrollViewer
};
Content.UpdateLayout();
int realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsGreaterThan(realized, 0);
return(repeater);
}
// [TestMethod] Issue 1018
public void ValidateFocusMoveOnElementClearedWithUniqueIds()
{
ItemsRepeater repeater = null;
CustomItemsSource dataSource = null;
RunOnUIThread.Execute(() =>
{
dataSource = new CustomItemsSourceWithUniqueId(Enumerable.Range(0, 5).ToList());
});
repeater = SetupRepeater(dataSource, "<Button Content='{Binding}' Height='10' />");
// dataSource: 0 1 2 3 4
// Index 0 deleted, focus should be on the new element which has index 0
SharedHelpers.RunActionsWithWait(
new Action[]
{
() => { MoveFocusToIndex(repeater, 0); },
() => { dataSource.Remove(0 /* index */, 1 /* count */, true /* reset*/); },
() => { ValidateCurrentFocus(repeater, 0 /*expectedIndex */, "1" /* expectedContent */); }
});
// dataSource: 1 2 3 4
// Last element deleted, focus should move to the previous element
int lastIndex = dataSource.Inner.Count - 1;
SharedHelpers.RunActionsWithWait(
new Action[]
{
() => { MoveFocusToIndex(repeater, lastIndex); },
() => { dataSource.Remove(lastIndex /* index */, 1 /* count */, true /* reset*/); },
() => { ValidateCurrentFocus(repeater, 2 /*expectedIndex */, "3" /* expectedContent */); }
});
// dataSource: 1 2 3
// Reset should keep the focused element as long as the unique id matches.
SharedHelpers.RunActionsWithWait(
new Action[]
{
() => { MoveFocusToIndex(repeater, 0); },
() => { dataSource.Reset(); },
() =>
{
int newIndex = dataSource.Inner.IndexOf(1);
ValidateCurrentFocus(repeater, newIndex /*expectedIndex */, "1" /* expectedContent */);
}
});
// dataSource: 1 2 3
// Remove multiple elements
SharedHelpers.RunActionsWithWait(
new Action[]
{
() => { MoveFocusToIndex(repeater, 0); },
() => { dataSource.Remove(0 /* index */, 2 /* count */, true /* reset*/); },
() => { ValidateCurrentFocus(repeater, 0 /*expectedIndex */, "3" /* expectedContent */); }
});
}
public void ValidateElementEvents()
{
CustomItemsSource dataSource = null;
RunOnUIThread.Execute(() => dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList()));
var repeater = SetupRepeater(dataSource);
RunOnUIThread.Execute(() =>
{
List <int> preparedIndices = new List <int>();
List <int> clearedIndices = new List <int>();
List <KeyValuePair <int, int> > changedIndices = new List <KeyValuePair <int, int> >();
repeater.ElementPrepared += (sender, args) =>
{
preparedIndices.Add(args.Index);
};
repeater.ElementClearing += (sender, args) =>
{
clearedIndices.Add(sender.GetElementIndex(args.Element));
};
repeater.ElementIndexChanged += (sender, args) =>
{
changedIndices.Add(new KeyValuePair <int, int>(args.OldIndex, args.NewIndex));
};
Log.Comment("Insert in realized range: Inserting 1 item at index 1");
dataSource.Insert(index: 1, count: 1, reset: false);
repeater.UpdateLayout();
Verify.AreEqual(1, preparedIndices.Count);
Verify.AreEqual(1, preparedIndices[0]);
Verify.AreEqual(2, changedIndices.Count);
Verify.IsTrue(changedIndices.Contains(new KeyValuePair <int, int>(1, 2)));
Verify.IsTrue(changedIndices.Contains(new KeyValuePair <int, int>(2, 3)));
Verify.AreEqual(1, clearedIndices.Count);
Verify.AreEqual(3, clearedIndices[0]);
preparedIndices.Clear();
clearedIndices.Clear();
changedIndices.Clear();
Log.Comment("Remove in realized range: Removing 1 item at index 0");
dataSource.Remove(index: 0, count: 1, reset: false);
repeater.UpdateLayout();
Verify.AreEqual(1, clearedIndices.Count);
Verify.AreEqual(0, clearedIndices[0]);
Verify.AreEqual(1, preparedIndices.Count);
Verify.AreEqual(2, preparedIndices[0]);
Verify.AreEqual(2, changedIndices.Count);
Verify.IsTrue(changedIndices.Contains(new KeyValuePair <int, int>(1, 0)));
Verify.IsTrue(changedIndices.Contains(new KeyValuePair <int, int>(2, 1)));
});
}
public void CanMoveItem()
{
CustomItemsSource dataSource = null;
RunOnUIThread.Execute(() => dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList()));
ScrollViewer scrollViewer = null;
ItemsRepeater repeater = null;
var viewChangedEvent = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
repeater = SetupRepeater(dataSource, ref scrollViewer);
scrollViewer.ScrollChanged += (sender, args) =>
{
if (args.HorizontalChange != 0 || args.VerticalChange != 0)
{
viewChangedEvent.Set();
}
};
scrollViewer.ChangeView(null, 400, null, true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTime), "Waiting for ViewChanged.");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
Log.Comment("Move before realized range.");
dataSource.Move(oldIndex: 0, newIndex: 1, count: 2, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
Log.Comment("Move in realized range.");
dataSource.Move(oldIndex: 3, newIndex: 5, count: 2, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
Log.Comment("Move after realized range");
dataSource.Move(oldIndex: 7, newIndex: 8, count: 2, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
});
}
public void CanReplaceSingleItem()
{
CustomItemsSource dataSource = null;
RunOnUIThread.Execute(() => dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList()));
ScrollViewer scrollViewer = null;
ItemsRepeater repeater = null;
var viewChangedEvent = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
repeater = SetupRepeater(dataSource, ref scrollViewer);
scrollViewer.ViewChanged += (sender, args) =>
{
if (!args.IsIntermediate)
{
viewChangedEvent.Set();
}
};
scrollViewer.ChangeView(null, 200, null, true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTime), "Waiting for ViewChanged.");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
Log.Comment("Replace before realized range.");
dataSource.Replace(index: 0, oldCount: 1, newCount: 1, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
Log.Comment("Replace in realized range.");
dataSource.Replace(index: 2, oldCount: 1, newCount: 1, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
Log.Comment("Replace after realized range");
dataSource.Replace(index: 8, oldCount: 1, newCount: 1, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(4, realized);
});
}
public void ValidateClear()
{
RunOnUIThread.Execute(() =>
{
var dataSource = new CustomItemsSource(Enumerable.Range(0, 3).ToList());
var repeater = SetupRepeater(dataSource, new FlowLayout());
Log.Comment("Clear the collection");
dataSource.Clear();
repeater.UpdateLayout();
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(0, realized);
});
}
public void ValidateRegularResets()
{
RunOnUIThread.Execute(() =>
{
var dataSource = new CustomItemsSource(Enumerable.Range(0, 3).ToList());
var repeater = SetupRepeater(dataSource);
Log.Comment("Reset collection");
dataSource.GetAtCallCount = 0;
dataSource.Reset();
repeater.UpdateLayout();
// Make sure data was requested because during a normal reset elements (already bound with data) are not reused.
Verify.AreEqual(3, dataSource.GetAtCallCount);
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
});
}
public void VerifyElement0OwnershipInUniformGridLayout()
{
CustomItemsSource dataSource = null;
RunOnUIThread.Execute(() => dataSource = new CustomItemsSource(new List <int>()));
ItemsRepeater repeater = null;
int elementsCleared = 0;
int elementsPrepared = 0;
RunOnUIThread.Execute(() =>
{
repeater = SetupRepeater(dataSource, new UniformGridLayout());
repeater.ElementPrepared += (sender, args) => { elementsPrepared++; };
repeater.ElementClearing += (sender, args) => { elementsCleared++; };
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Log.Comment("Add two item");
dataSource.Insert(index: 0, count: 1, reset: false);
dataSource.Insert(index: 1, count: 1, reset: false);
repeater.UpdateLayout();
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(2, realized);
Log.Comment("replace the first item");
dataSource.Replace(index: 0, oldCount: 1, newCount: 1, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(2, realized);
Log.Comment("Remove two items");
dataSource.Remove(index: 1, count: 1, reset: false);
dataSource.Remove(index: 0, count: 1, reset: false);
repeater.UpdateLayout();
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(0, realized);
Verify.AreEqual(elementsPrepared, elementsCleared);
});
}
public void EnsureReplaceOfAnchorDoesNotResetAllContainers()
{
CustomItemsSource dataSource = null;
RunOnUIThread.Execute(() => dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList()));
ScrollViewer scrollViewer = null;
ItemsRepeater repeater = null;
var viewChangedEvent = new ManualResetEvent(false);
int elementsCleared = 0;
int elementsPrepared = 0;
RunOnUIThread.Execute(() =>
{
repeater = SetupRepeater(dataSource, ref scrollViewer);
repeater.ElementPrepared += (sender, args) => { elementsPrepared++; };
repeater.ElementClearing += (sender, args) => { elementsCleared++; };
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
Log.Comment("Replace anchor element 0");
elementsPrepared = 0;
elementsCleared = 0;
dataSource.Replace(index: 0, oldCount: 1, newCount: 1, reset: false);
repeater.UpdateLayout();
Verify.AreEqual(1, elementsPrepared);
Verify.AreEqual(1, elementsCleared);
realized = VerifyRealizedRange(repeater, dataSource);
Verify.AreEqual(3, realized);
});
}
public void ValidateSentinelsDuringInserts()
{
RunOnUIThread.Execute(() =>
{
var dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList());
int getElementCallCount = 0;
int recycleElementCallCount = 0;
var elementFactory = new RecyclingElementFactoryDerived()
{
Templates = { { "key", SharedHelpers.GetDataTemplate("<TextBlock Text='{Binding}' Height='100' />") } },
RecyclePool = new RecyclePool(),
GetElementFunc = (int index, UIElement owner, UIElement elementFromBase) =>
{
getElementCallCount++;
return(elementFromBase);
},
ClearElementFunc = (UIElement element, UIElement owner) => recycleElementCallCount++,
ValidateElementIndices = false
};
var repeater = SetupRepeater(dataSource, elementFactory);
getElementCallCount = 0;
recycleElementCallCount = 0;
Log.Comment("Insert in realized range: Inserting 100 items at index 1");
dataSource.Insert(index: 1, count: 100, reset: false);
repeater.UpdateLayout();
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsGreaterThan(realized, 0);
Verify.IsLessThan(getElementCallCount, 6);
Verify.IsLessThan(recycleElementCallCount, 6);
});
}
private ItemsRepeater SetupRepeater(CustomItemsSource dataSource, ref ScrollViewer scrollViewer)
{
return(SetupRepeater(dataSource, GetElementFactory(), ref scrollViewer, new StackLayout()));
}
private ItemsRepeater SetupRepeater(CustomItemsSource dataSource, ElementFactory elementFactory = null)
{
ScrollViewer sv = null;
return(SetupRepeater(dataSource, elementFactory, ref sv, new StackLayout()));
}
private ItemsRepeater SetupRepeater(CustomItemsSource dataSource, VirtualizingLayout layout)
{
ScrollViewer sv = null;
return(SetupRepeater(dataSource, GetElementFactory(), ref sv, layout));
}
