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(object dataSource, VirtualizingLayout layout, string itemContent, out ScrollViewer scrollViewer)
{
ItemsRepeater repeater = null;
ScrollViewer sv = null;
RunOnUIThread.Execute(() =>
{
var elementFactory = new RecyclingElementFactory();
elementFactory.RecyclePool = new RecyclePool();
elementFactory.Templates["Item"] = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'> " + itemContent + @"</DataTemplate>");
repeater = new ItemsRepeater()
{
ItemsSource = dataSource,
ItemTemplate = elementFactory,
Layout = layout,
HorizontalCacheLength = 0.0,
VerticalCacheLength = 0.0
};
sv = new ScrollViewer
{
Content = repeater
};
Content = new ItemsRepeaterScrollHost()
{
Width = 200,
Height = 200,
ScrollViewer = sv
};
});
IdleSynchronizer.Wait();
scrollViewer = sv;
return(repeater);
}
public void ValidateRecycledElementOwnerAffinity()
{
RunOnUIThread.Execute(() =>
{
ItemsRepeater repeater1 = null;
ItemsRepeater repeater2 = null;
const int numItems = 10;
var dataCollection = new ObservableCollection <int>(Enumerable.Range(0, numItems));
const string recycleKey = "key";
var dataSource = MockItemsSource.CreateDataSource <int>(dataCollection, true);
var layout = new StackLayout();
var recyclePool = new RecyclePool();
var itemTemplate = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='{Binding}' />
</DataTemplate>");
repeater1 = new ItemsRepeater()
{
ItemsSource = dataSource,
Layout = layout,
ItemTemplate = new RecyclingElementFactoryDerived()
{
Templates = { { "key", itemTemplate } },
RecyclePool = recyclePool,
SelectTemplateIdFunc = (object data, UIElement owner) => recycleKey
}
};
repeater2 = new ItemsRepeater()
{
ItemsSource = dataSource,
Layout = layout,
ItemTemplate = new RecyclingElementFactoryDerived()
{
Templates = { { "key", itemTemplate } },
RecyclePool = recyclePool,
SelectTemplateIdFunc = (object data, UIElement owner) => recycleKey
}
};
var root = new StackPanel();
root.Children.Add(repeater1);
root.Children.Add(repeater2);
Content = new ItemsRepeaterScrollHost()
{
Width = 400,
Height = 400,
ScrollViewer = new ScrollViewer()
{
Content = root
}
};
Content.UpdateLayout();
Verify.AreEqual(numItems, VisualTreeHelper.GetChildrenCount(repeater1));
Verify.AreEqual(numItems, VisualTreeHelper.GetChildrenCount(repeater2));
// Throw all the elements into the recycle pool
dataCollection.Clear();
Content.UpdateLayout();
for (int i = 0; i < numItems; i++)
{
var element1 = (FrameworkElement)recyclePool.TryGetElement(recycleKey, repeater1);
Verify.AreSame(repeater1, element1.Parent);
var element2 = (FrameworkElement)recyclePool.TryGetElement(recycleKey, repeater2);
Verify.AreSame(repeater2, element2.Parent);
}
});
}
// [TestMethod] Temporarily disabled for bug 18866003
public void ValidateItemsRepeaterScrollHostScenario()
{
var realizationRects = new List <Rect>();
var scrollViewer = (ScrollViewer)null;
var viewChangedEvent = new ManualResetEvent(false);
int waitTime = 2000; // 2 seconds
RunOnUIThread.Execute(() =>
{
var repeater = new ItemsRepeater()
{
Layout = GetMonitoringLayout(new Size(500, 600), realizationRects),
HorizontalCacheLength = 0.0,
VerticalCacheLength = 0.0
};
scrollViewer = new ScrollViewer
{
Content = repeater,
HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden,
VerticalScrollBarVisibility = ScrollBarVisibility.Hidden,
};
scrollViewer.ViewChanged += (sender, args) =>
{
if (!args.IsIntermediate)
{
viewChangedEvent.Set();
}
};
var tracker = new ItemsRepeaterScrollHost()
{
Width = 200,
Height = 300,
ScrollViewer = scrollViewer
};
Content = tracker;
Content.UpdateLayout();
// First layout pass will invalidate measure during the first arrange
// so that we can get a viewport during the second measure/arrange pass.
// That's why Measure gets invoked twice.
// After that, ScrollViewer.SizeChanged is raised and it also invalidates
// layout (third pass).
Verify.AreEqual(3, realizationRects.Count);
Verify.AreEqual(new Rect(0, 0, 0, 0), realizationRects[0]);
Verify.AreEqual(new Rect(0, 0, 200, 300), realizationRects[1]);
Verify.AreEqual(new Rect(0, 0, 200, 300), realizationRects[2]);
realizationRects.Clear();
viewChangedEvent.Reset();
scrollViewer.ChangeView(null, 100.0, 1.0f, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(waitTime), "Waiting for view changed");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(new Rect(0, 100, 200, 300), realizationRects.Last());
realizationRects.Clear();
viewChangedEvent.Reset();
// Max viewport offset is (300, 400). Horizontal viewport offset
// is expected to get coerced from 400 to 300.
scrollViewer.ChangeView(400, 100.0, 1.0f, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(waitTime), "Waiting for view changed");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(new Rect(300, 100, 200, 300), realizationRects.Last());
realizationRects.Clear();
viewChangedEvent.Reset();
scrollViewer.ChangeView(null, null, 2.0f, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(waitTime), "Waiting for view changed");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(new Rect(300, 100, 100, 150), realizationRects.Last());
realizationRects.Clear();
});
}
public void ValidateElementAnimator()
{
ItemsRepeater repeater = null;
ElementAnimatorDerived animator = null;
var data = new ObservableCollection <string>(Enumerable.Range(0, 10).Select(i => string.Format("Item #{0}", i)));
var renderingEvent = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
var elementFactory = new RecyclingElementFactory();
elementFactory.RecyclePool = new RecyclePool();
elementFactory.Templates["Item"] = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='{Binding}' Height='50' />
</DataTemplate>");
CompositionTarget.Rendering += (sender, args) =>
{
renderingEvent.Set();
};
repeater = new ItemsRepeater()
{
ItemsSource = data,
ItemTemplate = elementFactory,
};
Content = new ItemsRepeaterScrollHost()
{
Width = 400,
Height = 800,
ScrollViewer = new ScrollViewer
{
Content = repeater
}
};
});
IdleSynchronizer.Wait();
Verify.IsTrue(renderingEvent.WaitOne(), "Waiting for rendering event");
List <CallInfo> showCalls = new List <CallInfo>();
List <CallInfo> hideCalls = new List <CallInfo>();
List <CallInfo> boundsChangeCalls = new List <CallInfo>();
RunOnUIThread.Execute(() =>
{
animator = new ElementAnimatorDerived()
{
HasShowAnimationValue = true,
HasHideAnimationValue = true,
HasBoundsChangeAnimationValue = true,
StartShowAnimationFunc = (UIElement element, AnimationContext context) =>
{
showCalls.Add(new CallInfo(repeater.GetElementIndex(element), context));
},
StartHideAnimationFunc = (UIElement element, AnimationContext context) =>
{
hideCalls.Add(new CallInfo(repeater.GetElementIndex(element), context));
},
StartBoundsChangeAnimationFunc = (UIElement element, AnimationContext context, Rect oldBounds, Rect newBounds) =>
{
boundsChangeCalls.Add(new CallInfo(repeater.GetElementIndex(element), context, oldBounds, newBounds));
}
};
repeater.Animator = animator;
renderingEvent.Reset();
data.Insert(0, "new item");
data.RemoveAt(2);
});
Verify.IsTrue(renderingEvent.WaitOne(), "Waiting for rendering event");
IdleSynchronizer.Wait();
Verify.AreEqual(1, showCalls.Count);
var call = showCalls[0];
Verify.AreEqual(0, call.Index);
Verify.AreEqual(AnimationContext.CollectionChangeAdd, call.Context);
Verify.AreEqual(1, hideCalls.Count);
call = hideCalls[0];
Verify.AreEqual(-1, call.Index); // not in the repeater anymore
Verify.AreEqual(AnimationContext.CollectionChangeRemove, call.Context);
Verify.AreEqual(1, boundsChangeCalls.Count);
call = boundsChangeCalls[0];
Verify.AreEqual(1, call.Index);
Verify.AreEqual(AnimationContext.CollectionChangeAdd | AnimationContext.CollectionChangeRemove, call.Context);
Verify.AreEqual(0, call.OldBounds.Y);
Verify.AreEqual(50, call.NewBounds.Y);
showCalls.Clear();
hideCalls.Clear();
boundsChangeCalls.Clear();
// Hookup just for show animations and validate.
RunOnUIThread.Execute(() =>
{
animator.HasShowAnimationValue = true;
animator.HasHideAnimationValue = false;
animator.HasBoundsChangeAnimationValue = false;
renderingEvent.Reset();
data.Insert(0, "new item");
data.RemoveAt(2);
});
Verify.IsTrue(renderingEvent.WaitOne(), "Waiting for rendering event");
IdleSynchronizer.Wait();
Verify.AreEqual(1, showCalls.Count);
call = showCalls[0];
Verify.AreEqual(0, call.Index);
Verify.AreEqual(AnimationContext.CollectionChangeAdd, call.Context);
Verify.AreEqual(0, hideCalls.Count);
Verify.AreEqual(0, boundsChangeCalls.Count);
}
