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 ValidateMappingAndAutoRecycling()
{
ItemsRepeater repeater = null;
ScrollViewer scrollViewer = null;
RunOnUIThread.Execute(() =>
{
var layout = new MockVirtualizingLayout()
{
MeasureLayoutFunc = (availableSize, context) =>
{
var element0 = context.GetOrCreateElementAt(index: 0);
// lookup - repeater will give back the same element and note that this element will not
// be pinned - i.e it will be auto recycled after a measure pass where GetElementAt(0) is not called.
var element0lookup = context.GetOrCreateElementAt(index: 0, options: ElementRealizationOptions.None);
var element1 = context.GetOrCreateElementAt(index: 1, options: ElementRealizationOptions.ForceCreate | ElementRealizationOptions.SuppressAutoRecycle);
// forcing a new element for index 1 that will be pinned (not auto recycled). This will be
// a completely new element. Repeater does not do the mapping/lookup when forceCreate is true.
var element1Clone = context.GetOrCreateElementAt(index: 1, options: ElementRealizationOptions.ForceCreate | ElementRealizationOptions.SuppressAutoRecycle);
Verify.AreSame(element0, element0lookup);
Verify.AreNotSame(element1, element1Clone);
element0.Measure(availableSize);
element1.Measure(availableSize);
element1Clone.Measure(availableSize);
return(new Size(100, 100));
},
};
Content = CreateAndInitializeRepeater(
itemsSource: Enumerable.Range(0, 5),
layout: layout,
elementFactory: GetDataTemplate("<Button>Hello</Button>"),
repeater: ref repeater,
scrollViewer: ref scrollViewer);
Content.UpdateLayout();
Verify.IsNotNull(repeater.TryGetElement(0));
Verify.IsNotNull(repeater.TryGetElement(1));
layout.MeasureLayoutFunc = null;
repeater.InvalidateMeasure();
Content.UpdateLayout();
Verify.IsNull(repeater.TryGetElement(0)); // not pinned, should be auto recycled.
Verify.IsNotNull(repeater.TryGetElement(1)); // pinned, should stay alive
});
}
public void ValidateStackLayoutDisabledVirtualizationWithItemsRepeater()
{
RunOnUIThread.Execute(() =>
{
var repeater = new ItemsRepeater();
var stackLayout = new StackLayout();
stackLayout.DisableVirtualization = true;
repeater.Layout = stackLayout;
repeater.ItemsSource = Enumerable.Range(0, 10);
repeater.ItemTemplate = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<Button Content='{Binding}' Height='100' />
</DataTemplate>");
var scrollViewer = new ScrollViewer()
{
Content = repeater
};
scrollViewer.Height = 100;
Content = scrollViewer;
Content.UpdateLayout();
for (int i = 0; i < repeater.ItemsSourceView.Count; i++)
{
var child = repeater.TryGetElement(i) as Button;
Verify.IsNotNull(child);
}
});
}
public void ValidateNonVirtualLayoutWithItemsRepeater()
{
RunOnUIThread.Execute(() =>
{
var repeater = new ItemsRepeater();
repeater.Layout = new NonVirtualStackLayout();
repeater.ItemsSource = Enumerable.Range(0, 10);
repeater.ItemTemplate = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<Button Content='{Binding}' Height='100' />
</DataTemplate>");
Content = repeater;
Content.UpdateLayout();
double expectedYOffset = 0;
for (int i = 0; i < repeater.ItemsSourceView.Count; i++)
{
var child = repeater.TryGetElement(i) as Button;
Verify.IsNotNull(child);
var layoutBounds = LayoutInformation.GetLayoutSlot(child);
Verify.AreEqual(expectedYOffset, layoutBounds.Y);
Verify.AreEqual(i, child.Content);
expectedYOffset += 100;
}
});
}
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 VerifyUIElementsInItemsSource()
{
ItemsRepeater repeater = null;
RunOnUIThread.Execute(() =>
{
var scrollhost = (ItemsRepeaterScrollHost)XamlReader.Parse(
@"<controls:ItemsRepeaterScrollHost
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:local='clr-namespace:MUXControlsTestApp.Samples;assembly=MUXControlsTestApp'
xmlns:controls='http://schemas.modernwpf.com/2019'>
<ScrollViewer>
<controls:ItemsRepeater x:Name='repeater'>
<controls:ItemsRepeater.ItemsSource>
<local:UICollection>
<Button>0</Button>
<Button>1</Button>
<Button>2</Button>
<Button>3</Button>
<Button>4</Button>
<Button>5</Button>
<Button>6</Button>
<Button>7</Button>
<Button>8</Button>
<Button>9</Button>
</local:UICollection>
</controls:ItemsRepeater.ItemsSource>
</controls:ItemsRepeater>
</ScrollViewer>
</controls:ItemsRepeaterScrollHost>");
repeater = (ItemsRepeater)scrollhost.FindName("repeater");
Content = scrollhost;
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
for (int i = 0; i < 10; i++)
{
var element = repeater.TryGetElement(i) as Button;
Verify.AreEqual(i.ToString(), element.Content);
}
});
}
public void VerifyStoreScenarioCache()
{
ItemsRepeater rootRepeater = null;
RunOnUIThread.Execute(() =>
{
var scrollhost = (ItemsRepeaterScrollHost)XamlReader.Parse(
@" <controls:ItemsRepeaterScrollHost Width='400' Height='200'
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='100' Width='100'/>
</DataTemplate>
<DataTemplate x:Key='GroupTemplate'>
<StackPanel>
<TextBlock Text='{Binding}' />
<controls:ItemsRepeaterScrollHost>
<ScrollViewer HorizontalScrollBarVisibility='Auto' VerticalScrollBarVisibility='Hidden'>
<controls:ItemsRepeater ItemTemplate='{StaticResource ItemTemplate}' ItemsSource='{Binding}'>
<controls:ItemsRepeater.Layout>
<controls:StackLayout Orientation='Horizontal' />
</controls:ItemsRepeater.Layout>
</controls:ItemsRepeater>
</ScrollViewer>
</controls:ItemsRepeaterScrollHost>
</StackPanel>
</DataTemplate>
</controls:ItemsRepeaterScrollHost.Resources>
<ScrollViewer x:Name='scrollviewer'>
<controls:ItemsRepeater x:Name='rootRepeater' ItemTemplate='{StaticResource GroupTemplate}'/>
</ScrollViewer>
</controls:ItemsRepeaterScrollHost>");
rootRepeater = (ItemsRepeater)scrollhost.FindName("rootRepeater");
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;
});
IdleSynchronizer.Wait();
// Verify that first items outside the visible range but in the realized range
// for the inner of the nested repeaters are realized.
RunOnUIThread.Execute(() =>
{
// Group2 will be outside the visible range but within the realized range.
var group2 = rootRepeater.TryGetElement(2) as StackPanel;
Verify.IsNotNull(group2);
var group2Repeater = ((ItemsRepeaterScrollHost)group2.Children[1]).ScrollViewer.Content as ItemsRepeater;
Verify.IsNotNull(group2Repeater);
Verify.IsNotNull(group2Repeater.TryGetElement(0));
});
}