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));
});
}
public void ValidateElementToIndexMapping()
{
ItemsRepeater repeater = 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'>
<TextBlock Text='{Binding}' Height='50' />
</DataTemplate>");
repeater = new ItemsRepeater()
{
ItemsSource = Enumerable.Range(0, 10).Select(i => string.Format("Item #{0}", i)),
ItemTemplate = elementFactory,
// 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));
});
}
public void VerifyCurrentAnchor()
{
if (PlatformConfiguration.IsDebugBuildConfiguration())
{
// Test is failing in chk configuration due to:
// Bug #1726 Test Failure: RepeaterTests.VerifyCurrentAnchor
Log.Warning("Skipping test for Debug builds.");
return;
}
ItemsRepeater rootRepeater = null;
ScrollViewer scrollViewer = null;
ItemsRepeaterScrollHost scrollhost = null;
ManualResetEvent viewChanged = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
scrollhost = (ItemsRepeaterScrollHost)XamlReader.Parse(
@"<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='http://schemas.modernwpf.com/2019'>
<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.ScrollChanged += (sender, args) =>
{
if (args.HorizontalChange != 0 || args.VerticalChange != 0)
{
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();
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(i * 200, scrollViewer.VerticalOffset);
var anchor = scrollhost.CurrentAnchor;
var anchorIndex = rootRepeater.GetElementIndex(anchor);
Log.Comment("CurrentAnchor: " + anchorIndex);
Verify.AreEqual(i * 4, anchorIndex);
});
}
}