private static Button[] GetRealizedRange(ItemsRepeater repeater)
{
return(Enumerable.Range(0, VisualTreeHelper.GetChildrenCount(repeater))
.Select(i => (Button)VisualTreeHelper.GetChild(repeater, i))
.Where(e => repeater.GetElementIndex(e) >= 0)
.OrderBy(e => repeater.GetElementIndex(e))
.ToArray());
}
public void ValidateRepeaterDefaults()
{
RunOnUIThread.Execute(() =>
{
var repeater = new ItemsRepeater()
{
ItemsSource = Enumerable.Range(0, 10).Select(i => string.Format("Item #{0}", i)),
};
Content = new ItemsRepeaterScrollHost()
{
Width = 400,
Height = 800,
ScrollViewer = new ScrollViewer {
Content = repeater
}
};
Content.UpdateLayout();
for (int i = 0; i < 10; i++)
{
var element = repeater.TryGetElement(i);
Verify.IsNotNull(element);
Verify.AreEqual(string.Format("Item #{0}", i), ((TextBlock)element).Text);
Verify.AreEqual(i, repeater.GetElementIndex(element));
}
Verify.IsNull(repeater.TryGetElement(20));
});
}
private void ValidateCurrentFocus(ItemsRepeater repeater, int expectedIndex, string expectedContent)
{
var currentFocus = FocusManager.GetFocusedElement() as ContentControl;
var currentFocusedIndex = repeater.GetElementIndex(currentFocus);
Log.Comment("expectedIndex: " + expectedIndex + " actual : " + currentFocusedIndex);
Verify.AreEqual(expectedIndex, currentFocusedIndex);
Log.Comment("expectedContent: " + expectedContent + " actual : " + currentFocus.Content.ToString());
Verify.AreEqual(expectedContent, currentFocus.Content.ToString());
}
public void ValidateElementToIndexMapping()
{
ItemsRepeater repeater = null;
RunOnUIThread.Execute(() =>
{
var elementFactory = new RecyclingElementFactory();
elementFactory.RecyclePool = new RecyclePool();
elementFactory.Templates["Item"] = (DataTemplate)XamlReader.Load(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='{Binding}' Height='50' />
</DataTemplate>");
repeater = new ItemsRepeater()
{
ItemsSource = Enumerable.Range(0, 10).Select(i => string.Format("Item #{0}", i)),
#if BUILD_WINDOWS
ItemTemplate = (Windows.UI.Xaml.IElementFactory)elementFactory,
#else
ItemTemplate = elementFactory,
#endif
// Default is StackLayout, so do not have to explicitly set.
// Layout = new StackLayout(),
};
Content = new ItemsRepeaterScrollHost()
{
Width = 400,
Height = 800,
ScrollViewer = new ScrollViewer
{
Content = repeater
}
};
Content.UpdateLayout();
for (int i = 0; i < 10; i++)
{
var element = repeater.TryGetElement(i);
Verify.IsNotNull(element);
Verify.AreEqual(string.Format("Item #{0}", i), ((TextBlock)element).Text);
Verify.AreEqual(i, repeater.GetElementIndex(element));
}
Verify.IsNull(repeater.TryGetElement(20));
});
}
private void OnRecipeDeleted(object sender, RoutedEventArgs e)
{
if (_flatData != null)
{
// walk up the tree to find the container and repeater.
var container = (FrameworkElement)sender;
while (!(container.Parent is ItemsRepeater))
{
container = (FrameworkElement)container.Parent;
}
ItemsRepeater repeater = (ItemsRepeater)container.Parent;
int index = repeater.GetElementIndex(container);
_flatData.RemoveAt(index);
}
}
private void OnRecipeInserted(object sender, RoutedEventArgs e)
{
if (_flatData != null)
{
// walk up the tree to find the container and repeater.
var container = (FrameworkElement)sender;
while (!(container.Parent is ItemsRepeater))
{
container = (FrameworkElement)container.Parent;
}
ItemsRepeater repeater = (ItemsRepeater)container.Parent;
int index = repeater.GetElementIndex(container) + 1;
_flatData.Insert(index, new Recipe()
{
ImageUri = new Uri("ms-appx:///Images/recipe0.png"),
Description = "added recipe",
});
}
}
public void VerifyCurrentAnchor()
{
ItemsRepeater rootRepeater = null;
ScrollViewer scrollViewer = null;
ItemsRepeaterScrollHost scrollhost = null;
ManualResetEvent viewChanged = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
scrollhost = (ItemsRepeaterScrollHost)XamlReader.Load(
@"<controls:ItemsRepeaterScrollHost Width='400' Height='600'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:controls='using:Microsoft.UI.Xaml.Controls'>
<controls:ItemsRepeaterScrollHost.Resources>
<DataTemplate x:Key='ItemTemplate' >
<TextBlock Text='{Binding}' Height='50'/>
</DataTemplate>
</controls:ItemsRepeaterScrollHost.Resources>
<ScrollViewer x:Name='scrollviewer'>
<controls:ItemsRepeater x:Name='rootRepeater' ItemTemplate='{StaticResource ItemTemplate}' VerticalCacheLength='0' />
</ScrollViewer>
</controls:ItemsRepeaterScrollHost>");
rootRepeater = (ItemsRepeater)scrollhost.FindName("rootRepeater");
scrollViewer = (ScrollViewer)scrollhost.FindName("scrollviewer");
scrollViewer.ViewChanged += (sender, args) =>
{
if (!args.IsIntermediate)
{
viewChanged.Set();
}
};
rootRepeater.ItemsSource = Enumerable.Range(0, 500);
Content = scrollhost;
});
// scroll down several times and validate current anchor
for (int i = 1; i < 10; i++)
{
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
scrollViewer.ChangeView(null, i * 200, null);
});
Verify.IsTrue(viewChanged.WaitOne(DefaultWaitTimeInMS));
viewChanged.Reset();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(i * 200, scrollViewer.VerticalOffset);
var anchor = PlatformConfiguration.IsOSVersionLessThan(OSVersion.Redstone5) ?
scrollhost.CurrentAnchor :
scrollViewer.CurrentAnchor;
var anchorIndex = rootRepeater.GetElementIndex(anchor);
Log.Comment("CurrentAnchor: " + anchorIndex);
Verify.AreEqual(i * 4, anchorIndex);
});
}
}
// [TestMethod] Issue #1018
public void CanPinFocusedElements()
{
// Setup a grouped repeater scenario with two groups each containing two items.
var data = new ObservableCollection <ObservableCollection <string> >(Enumerable
.Range(0, 2)
.Select(i => new ObservableCollection <string>(Enumerable
.Range(0, 2)
.Select(j => string.Format("Item #{0}.{1}", i, j)))));
List <ContentControl>[] itemElements = null;
ItemsRepeater[] innerRepeaters = null;
List <StackPanel> groupElements = null;
ItemsRepeater rootRepeater = null;
var gotFocus = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
itemElements = new[] {
Enumerable.Range(0, 2).Select(i => new ContentControl()).ToList(),
Enumerable.Range(0, 2).Select(i => new ContentControl()).ToList()
};
itemElements[0][0].GotFocus += delegate { gotFocus.Set(); };
innerRepeaters = Enumerable.Range(0, 2).Select(i => CreateRepeater(
MockItemsSource.CreateDataSource(data[i], supportsUniqueIds: false),
MockElementFactory.CreateElementFactory(itemElements[i]))).ToArray();
groupElements = Enumerable.Range(0, 2).Select(i =>
{
var panel = new StackPanel();
panel.Children.Add(new ContentControl());
panel.Children.Add(innerRepeaters[i]);
return(panel);
}).ToList();
rootRepeater = CreateRepeater(
MockItemsSource.CreateDataSource(data, supportsUniqueIds: false),
MockElementFactory.CreateElementFactory(groupElements));
Content = rootRepeater;
rootRepeater.UpdateLayout();
itemElements[0][0].Focus(FocusState.Keyboard);
});
Verify.IsTrue(gotFocus.WaitOne(DefaultWaitTimeInMS), "Waiting for focus event on the first element of the first group.");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Log.Comment("Recycle focused element 0.0 and validate it's still realized because it is pinned.");
{
var ctx = (VirtualizingLayoutContext)innerRepeaters[0].Tag;
ctx.RecycleElement(itemElements[0][0]);
Verify.AreEqual(0, innerRepeaters[0].GetElementIndex(itemElements[0][0]));
}
Log.Comment("Recycle element 0.1 and validate it's no longer realized because it is not pinned.");
{
var ctx = (VirtualizingLayoutContext)innerRepeaters[0].Tag;
ctx.RecycleElement(itemElements[0][1]);
Verify.AreEqual(-1, innerRepeaters[0].GetElementIndex(itemElements[0][1]));
}
Log.Comment("Recycle group 0 and validate it's still realized because one of its items is pinned.");
{
var ctx = (VirtualizingLayoutContext)rootRepeater.Tag;
ctx.RecycleElement(groupElements[0]);
Verify.AreEqual(0, rootRepeater.GetElementIndex(groupElements[0]));
}
itemElements[1][1].GotFocus += delegate { gotFocus.Set(); };
itemElements[1][1].Focus(FocusState.Keyboard);
});
Verify.IsTrue(gotFocus.WaitOne(DefaultWaitTimeInMS), "Waiting for focus event on the second element of the second group.");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Log.Comment(@"Move focus to item 1.1 and validate item 0.0 and group 0 are recycled because
the only thing keeping them around is the fact that item 0.0 was focus pinned");
{
((VirtualizingLayoutContext)rootRepeater.Tag).RecycleElement(groupElements[0]);
((VirtualizingLayoutContext)innerRepeaters[0].Tag).RecycleElement(itemElements[0][0]);
Verify.AreEqual(-1, rootRepeater.GetElementIndex(groupElements[0]));
Verify.AreEqual(-1, innerRepeaters[0].GetElementIndex(itemElements[0][0]));
Verify.AreEqual(1, innerRepeaters[0].GetElementIndex(itemElements[1][1]));
}
Log.Comment(@"Delete item 1.1 from the data. This will force the element to get recycled even if it's pinned.");
{
data[1].RemoveAt(1);
rootRepeater.UpdateLayout();
Verify.AreEqual(-1, innerRepeaters[1].GetElementIndex(itemElements[1][1]));
}
});
}
// [TestMethod] Issue 1018
public void CanReuseElementsDuringUniqueIdReset()
{
var data = new WinRTCollection(Enumerable.Range(0, 2).Select(i => string.Format("Item #{0}", i)));
List <UIElement> mapping = null;
ItemsRepeater repeater = null;
MockElementFactory elementFactory = null;
ContentControl focusedElement = null;
RunOnUIThread.Execute(() =>
{
mapping = new List <UIElement> {
new ContentControl(), new ContentControl()
};
repeater = CreateRepeater(
MockItemsSource.CreateDataSource(data, supportsUniqueIds: true),
MockElementFactory.CreateElementFactory(mapping));
elementFactory = (MockElementFactory)repeater.ItemTemplate;
Content = repeater;
repeater.UpdateLayout();
focusedElement = (ContentControl)repeater.TryGetElement(1);
focusedElement.Focus(FocusState.Keyboard);
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
elementFactory.ValidateGetElementCalls(
new MockElementFactory.GetElementCallInfo(0, repeater),
new MockElementFactory.GetElementCallInfo(1, repeater));
elementFactory.ValidateRecycleElementCalls();
data.ResetWith(new[] { data[0], "New item" });
Verify.AreEqual(0, repeater.GetElementIndex(mapping[0]));
Verify.AreEqual(1, repeater.GetElementIndex(mapping[1]));
Verify.IsNull(repeater.TryGetElement(0));
Verify.IsNull(repeater.TryGetElement(1));
elementFactory.ValidateGetElementCalls(/* GetElement should not be called */);
elementFactory.ValidateRecycleElementCalls(/* RecycleElement should not be called */);
mapping[1] = new ContentControl(); // For "New Item"
repeater.UpdateLayout();
Verify.AreEqual(0, repeater.GetElementIndex(mapping[0]));
Verify.AreEqual(1, repeater.GetElementIndex(mapping[1]));
Verify.AreEqual(mapping[0], repeater.TryGetElement(0));
Verify.AreEqual(mapping[1], repeater.TryGetElement(1));
elementFactory.ValidateGetElementCalls(
new MockElementFactory.GetElementCallInfo(1, repeater));
elementFactory.ValidateRecycleElementCalls(
new MockElementFactory.RecycleElementCallInfo(focusedElement, repeater));
// If the focused element survived the reset, we will keep focus on it. If not, we
// try to find one based on the index. In this case, the focused element (index 1)
// got recycled, and we still have index 1 after the stable reset, so the new index 1
// will get focused. Note that recycling the elements to view generator in the case of
// stable reset happens during the arrange, so by that time we will have pulled elements
// from the stable reset pool and maybe created some new elements as well.
int index = repeater.GetElementIndex(focusedElement);
Log.Comment("focused index " + index);
Verify.AreEqual(mapping[1], FocusManager.GetFocusedElement());
});
}