public void VerifyCorrectionsInNonScrollableDirection()
{
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'>
<ScrollViewer Width='400' Height='400' x:Name='scrollviewer'>
<controls:ItemsRepeater x:Name='repeater'>
<DataTemplate>
<StackPanel>
<controls:ItemsRepeater ItemsSource='{Binding}'>
<controls:ItemsRepeater.Layout>
<controls:StackLayout Orientation='Horizontal' />
</controls:ItemsRepeater.Layout>
</controls:ItemsRepeater>
</StackPanel>
</DataTemplate>
</controls:ItemsRepeater>
</ScrollViewer>
</controls:ItemsRepeaterScrollHost>");
rootRepeater = (ItemsRepeater)scrollhost.FindName("repeater");
scrollViewer = (ScrollViewer)scrollhost.FindName("scrollviewer");
scrollViewer.ViewChanged += (sender, args) =>
{
if (!args.IsIntermediate)
{
viewChanged.Set();
}
};
List <List <int> > items = new List <List <int> >();
for (int i = 0; i < 100; i++)
{
items.Add(Enumerable.Range(0, 4).ToList());
}
rootRepeater.ItemsSource = items;
Content = scrollhost;
});
// scroll down several times and validate no crash
for (int i = 1; i < 5; i++)
{
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
scrollViewer.ChangeView(null, i * 200, null);
});
Verify.IsTrue(viewChanged.WaitOne(DefaultWaitTimeInMS));
viewChanged.Reset();
}
}
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;
if (PlatformConfiguration.IsOsVersion(OSVersion.NineteenH1) &&
PlatformConfiguration.IsDebugBuildConfiguration())
{
anchor = scrollhost.CurrentAnchor;
}
var anchorIndex = rootRepeater.GetElementIndex(anchor);
Log.Comment("CurrentAnchor: " + anchorIndex);
Verify.AreEqual(i * 4, anchorIndex);
});
}
}