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 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));
});
}
public void ValidateDataContextDoesNotGetOverwritten()
{
const string c_element1DataContext = "Element1_DataContext";
RunOnUIThread.Execute(() =>
{
var data = new List <Button>()
{
new Button()
{
Content = "Element1_Content",
DataContext = c_element1DataContext
}
};
var elementFactory = new DataAsElementElementFactory();
var repeater = new ItemsRepeater()
{
ItemsSource = data,
ItemTemplate = elementFactory
};
Content = repeater;
Content.UpdateLayout();
// Verify that DataContext is still the same
var firstElement = repeater.TryGetElement(0) as Button;
var retrievedDataContextItem1 = firstElement.DataContext as string;
Verify.IsTrue(retrievedDataContextItem1 == c_element1DataContext);
});
}
public void ValidateDataContextGetsPropagated()
{
const string c_element1DataContext = "Element1_DataContext";
RunOnUIThread.Execute(() =>
{
var data = new List <Button>()
{
new Button()
{
Content = "Element1_Content",
DataContext = c_element1DataContext
}
};
var elementFactory = new ElementFromElementElementFactory();
var repeater = new ItemsRepeater()
{
ItemsSource = data,
ItemTemplate = elementFactory
};
Content = repeater;
Content.UpdateLayout();
// Verify that DataContext of data has propagated to the container
var firstElement = repeater.TryGetElement(0) as Button;
var retrievedDataContextItem1 = firstElement.DataContext as string;
Verify.IsTrue(data[0] == firstElement.Content);
Verify.IsTrue(retrievedDataContextItem1 == c_element1DataContext);
});
}
private void BtnStartBringIntoView_Click(object sender, RoutedEventArgs e)
{
try
{
txtInnerStockOffsetsChangeDuration.Text = string.Empty;
txtOuterStockOffsetsChangeDuration.Text = string.Empty;
FrameworkElement targetElement = null;
ItemsRepeater repeater = null;
switch (cmbNestingCombination.SelectedIndex)
{
case 0: //ScrollerInScroller
repeater = repeater1;
break;
case 1: //ScrollerInScrollViewer
repeater = repeater2;
break;
case 2: //ScrollViewerInScroller
repeater = repeater3;
break;
}
Border border = repeater.TryGetElement(Convert.ToInt16(txtTargetElement.Text)) as Border;
if (border != null)
{
targetElement = border.Child as FrameworkElement;
if (targetElement != null)
{
BringIntoViewOptions options = new BringIntoViewOptions();
options.AnimationDesired = cmbAnimationDesired.SelectedIndex == 0;
options.HorizontalAlignmentRatio = Convert.ToDouble(txtHorizontalAlignmentRatio.Text);
options.VerticalAlignmentRatio = Convert.ToDouble(txtVerticalAlignmentRatio.Text);
options.HorizontalOffset = Convert.ToDouble(txtHorizontalOffset.Text);
options.VerticalOffset = Convert.ToDouble(txtVerticalOffset.Text);
if (chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("Invoking StartBringIntoView on " + targetElement.Name);
}
targetElement.StartBringIntoView(options);
}
}
if (targetElement == null && chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("TargetElement not found");
}
}
catch (Exception ex)
{
txtExceptionReport.Text = ex.ToString();
lstScrollerEvents.Items.Add(ex.ToString());
}
}
public void ValidateNonVirtualLayoutWithItemsRepeater()
{
RunOnUIThread.Execute(() =>
{
var repeater = new ItemsRepeater();
repeater.Layout = new NonVirtualStackLayout();
repeater.ItemsSource = Enumerable.Range(0, 10);
repeater.ItemTemplate = (DataTemplate)XamlReader.Load(
@"<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;
}
});
}
private void ValidateRealizedRange(
ItemsRepeater repeater,
int expectedFirstItemIndex,
int expectedLastItemIndex)
{
Log.Comment("Validating Realized Range...");
int actualFirstItemIndex = -1;
int actualLastItemIndex = -1;
int itemIndex = 0;
RunOnUIThread.Execute(() =>
{
var items = repeater.ItemsSource as IEnumerable <string>;
foreach (var item in items)
{
var itemElement = repeater.TryGetElement(itemIndex);
if (itemElement != null)
{
actualFirstItemIndex =
actualFirstItemIndex == -1 ?
itemIndex :
actualFirstItemIndex;
actualLastItemIndex = itemIndex;
}
++itemIndex;
}
});
Log.Comment(string.Format("FirstItemIndex - {0} {1}", expectedFirstItemIndex, actualFirstItemIndex));
Log.Comment(string.Format("LastItemIndex - {0} {1}", expectedLastItemIndex, actualLastItemIndex));
Verify.AreEqual(expectedFirstItemIndex, actualFirstItemIndex);
Verify.AreEqual(expectedLastItemIndex, actualLastItemIndex);
}
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.Load(
@"<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 CanResetLayoutAfterUniqueIdReset()
{
var data = new WinRTCollection(Enumerable.Range(0, 2).Select(i => string.Format("Item #{0}", i)));
object dataSource = null;
RunOnUIThread.Execute(() => dataSource = MockItemsSource.CreateDataSource(data, supportsUniqueIds: true));
ItemsRepeater repeater = SetupRepeater(dataSource);
RunOnUIThread.Execute(() =>
{
var range = new UIElement[] { repeater.TryGetElement(0), repeater.TryGetElement(1) };
var clearedElements = new List <UIElement>();
repeater.ElementClearing += (s, e) =>
{
clearedElements.Add(e.Element);
};
// The realized elements will be sent to the unique id reset pool.
// They haven't been cleared yet.
data.Reset();
Verify.AreEqual(0, clearedElements.Count);
// This also cause elements to be sent to the unique id reset pool.
// We are validating here that we are smart enough not send them there twice.
// Doing so will cause an exception to be thrown.
repeater.Layout = null;
Verify.AreEqual(0, clearedElements.Count);
repeater.UpdateLayout();
// Layout runs. The elements in the reset pool are not used.
// They should be cleared back to the view generator at this point.
Verify.AreEqual(2, clearedElements.Count);
Verify.AreEqual(range[0], clearedElements[0]);
Verify.AreEqual(range[1], clearedElements[1]);
Verify.IsNull(repeater.TryGetElement(0));
Verify.IsNull(repeater.TryGetElement(1));
});
}
public void CanChangeFocusAfterUniqueIdReset()
{
var data = new WinRTCollection(Enumerable.Range(0, 2).Select(i => string.Format("Item #{0}", i)));
object dataSource = null;
RunOnUIThread.Execute(() => dataSource = MockItemsSource.CreateDataSource(data, supportsUniqueIds: true));
ItemsRepeater repeater = SetupRepeater(dataSource);
Control focusedElement = null;
RunOnUIThread.Execute(() =>
{
focusedElement = (Control)repeater.TryGetElement(0);
focusedElement.Focus(FocusState.Keyboard);
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
data.Reset();
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
// Still focused.
Verify.AreEqual(focusedElement, FocusManager.GetFocusedElement());
// Change focused element.
focusedElement = (Control)repeater.TryGetElement(1);
focusedElement.Focus(FocusState.Keyboard);
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
// Focus is on the new element.
Verify.AreEqual(focusedElement, FocusManager.GetFocusedElement());
});
}
public void VerifyUIElementsInItemsSource()
{
ItemsRepeater repeater = null;
RunOnUIThread.Execute(() =>
{
var scrollhost = (ItemsRepeaterScrollHost)XamlReader.Load(
@"<controls:ItemsRepeaterScrollHost
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:local='using:MUXControlsTestApp.Samples'
xmlns:controls='using:Microsoft.UI.Xaml.Controls'>
<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);
}
});
}
private VirtualizingLayout CreateLayout(ItemsRepeater repeater)
{
var layout = new MockVirtualizingLayout();
var children = new List <UIElement>();
layout.MeasureLayoutFunc = (availableSize, context) =>
{
repeater.Tag = repeater.Tag ?? context;
children.Clear();
var itemCount = context.ItemCount;
for (int i = 0; i < itemCount; ++i)
{
var element = repeater.TryGetElement(i) ?? context.GetOrCreateElementAt(i);
element.Measure(availableSize);
children.Add(element);
}
return(new Size(10, 10));
};
return(layout);
}
private void BtnStartBringIntoView_Click(object sender, RoutedEventArgs e)
{
try
{
txtInnerStockOffsetsChangeDuration.Text = string.Empty;
txtOuterStockOffsetsChangeDuration.Text = string.Empty;
FrameworkElement targetElement = null;
ItemsRepeater repeater = null;
switch (cmbNestingCombination.SelectedIndex)
{
case 0: //ScrollPresenterInScrollPresenter (1)
repeater = repeater1;
break;
case 2: //ScrollPresenterInScrollViewer
repeater = repeater2;
break;
case 3: //ScrollViewerInScrollPresenter
repeater = repeater3;
break;
case 4: //ScrollViewerInScrollViewer
repeater = repeater4;
break;
}
Border border = null;
if (repeater != null)
{
border = repeater.TryGetElement(Convert.ToInt16(txtTargetElement.Text)) as Border;
}
else
{
// case ScrollPresenterInScrollPresenter (2)
border = (innerScrollPresenter3.Content as StackPanel).Children[Convert.ToInt16(txtTargetElement.Text)] as Border;
}
if (border != null)
{
targetElement = border.Child as FrameworkElement;
if (targetElement != null)
{
BringIntoViewOptions options = new BringIntoViewOptions();
options.AnimationDesired = cmbAnimationDesired.SelectedIndex == 0;
options.HorizontalAlignmentRatio = Convert.ToDouble(txtHorizontalAlignmentRatio.Text);
options.VerticalAlignmentRatio = Convert.ToDouble(txtVerticalAlignmentRatio.Text);
options.HorizontalOffset = Convert.ToDouble(txtHorizontalOffset.Text);
options.VerticalOffset = Convert.ToDouble(txtVerticalOffset.Text);
if (chkIgnoreSnapPoints.IsChecked == false)
{
ScrollPresenter scrollPresenter1 = null;
ScrollPresenter scrollPresenter2 = null;
switch (cmbNestingCombination.SelectedIndex)
{
case 0: //ScrollPresenterInScrollPresenter (1)
scrollPresenter1 = outerScrollPresenter;
scrollPresenter2 = innerScrollPresenter;
break;
case 1: //ScrollPresenterInScrollPresenter (2)
scrollPresenter1 = outerScrollPresenter3;
scrollPresenter2 = innerScrollPresenter3;
break;
case 2: //ScrollPresenterInScrollViewer
scrollPresenter1 = innerScrollPresenter2;
break;
case 3: //ScrollViewerInScrollPresenter
scrollPresenter1 = outerScrollPresenter2;
break;
}
if (scrollPresenter1 != null)
{
RefreshSnapPoints(scrollPresenter1, scrollPresenter1.Content as StackPanel);
}
if (scrollPresenter2 != null)
{
RefreshSnapPoints(scrollPresenter2, scrollPresenter2.Content as StackPanel);
}
}
if (chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("Invoking StartBringIntoView on " + targetElement.Name);
}
targetElement.StartBringIntoView(options);
}
}
if (targetElement == null && chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("TargetElement not found");
}
}
catch (Exception ex)
{
txtExceptionReport.Text = ex.ToString();
lstScrollPresenterEvents.Items.Add(ex.ToString());
}
}
public void VerifyStoreScenarioCache()
{
ItemsRepeater rootRepeater = null;
RunOnUIThread.Execute(() =>
{
var scrollhost = (ItemsRepeaterScrollHost)XamlReader.Load(
@" <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='using:Microsoft.UI.Xaml.Controls'>
<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 HorizontalScrollMode='Enabled' VerticalScrollMode='Disabled' 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));
});
}
public void CanBringIntoViewElements()
{
if (!PlatformConfiguration.IsOsVersionGreaterThanOrEqual(OSVersion.Redstone5))
{
// Note that UIElement.BringIntoViewRequested was added in RS4, and effective viewport was added in RS5
Log.Warning("Skipping since version is less than RS5 and effective viewport feature is not available below RS5");
return;
}
Scroller scroller = null;
ItemsRepeater repeater = null;
var rootLoadedEvent = new AutoResetEvent(initialState: false);
var viewChangedEvent = new AutoResetEvent(initialState: false);
var waitingForIndex = -1;
var indexRealized = new AutoResetEvent(initialState: false);
var viewChangedOffsets = new List <double>();
RunOnUIThread.Execute(() =>
{
var lorem = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam laoreet erat vel massa rutrum, eget mollis massa vulputate. Vivamus semper augue leo, eget faucibus nulla mattis nec. Donec scelerisque lacus at dui ultricies, eget auctor ipsum placerat. Integer aliquet libero sed nisi eleifend, nec rutrum arcu lacinia. Sed a sem et ante gravida congue sit amet ut augue. Donec quis pellentesque urna, non finibus metus. Proin sed ornare tellus. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam laoreet erat vel massa rutrum, eget mollis massa vulputate. Vivamus semper augue leo, eget faucibus nulla mattis nec. Donec scelerisque lacus at dui ultricies, eget auctor ipsum placerat. Integer aliquet libero sed nisi eleifend, nec rutrum arcu lacinia. Sed a sem et ante gravida congue sit amet ut augue. Donec quis pellentesque urna, non finibus metus. Proin sed ornare tellus.";
var root = (Grid)XamlReader.Load(TestUtilities.ProcessTestXamlForRepo(
@"<Grid 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'
xmlns:primitives='using:Microsoft.UI.Xaml.Controls.Primitives'>
<Grid.Resources>
<controls:StackLayout x:Name='VerticalStackLayout' />
<controls:RecyclingElementFactory x:Key='ElementFactory'>
<controls:RecyclingElementFactory.RecyclePool>
<controls:RecyclePool />
</controls:RecyclingElementFactory.RecyclePool>
<DataTemplate x:Key='ItemTemplate'>
<Border Background='LightGray' Margin ='5'>
<TextBlock Text='{Binding}' TextWrapping='WrapWholeWords' />
</Border>
</DataTemplate>
</controls:RecyclingElementFactory>
</Grid.Resources>
<primitives:Scroller x:Name='Scroller' Width='400' Height='600' ContentOrientation='Vertical' Background='Gray'>
<controls:ItemsRepeater
x:Name='ItemsRepeater'
ItemTemplate='{StaticResource ElementFactory}'
Layout='{StaticResource VerticalStackLayout}'
HorizontalCacheLength='0'
VerticalCacheLength='0' />
</primitives:Scroller>
</Grid>"));
var elementFactory = (RecyclingElementFactory)root.Resources["ElementFactory"];
scroller = (Scroller)root.FindName("Scroller");
repeater = (ItemsRepeater)root.FindName("ItemsRepeater");
repeater.ElementPrepared += (sender, args) =>
{
Log.Comment($"Realized index: {args.Index} Wating for index {waitingForIndex}");
if (args.Index == waitingForIndex)
{
indexRealized.Set();
}
};
var items = Enumerable.Range(0, 400).Select(i => string.Format("{0}: {1}", i, lorem.Substring(0, 250)));
repeater.ItemsSource = items;
scroller.ViewChanged += (o, e) =>
{
Log.Comment("Scroller.ViewChanged: VerticalOffset=" + scroller.VerticalOffset);
viewChangedOffsets.Add(scroller.VerticalOffset);
viewChangedEvent.Set();
};
scroller.BringingIntoView += (o, e) =>
{
Log.Comment("Scroller.BringingIntoView:");
Log.Comment("TargetVerticalOffset=" + e.TargetVerticalOffset);
Log.Comment("RequestEventArgs.AnimationDesired=" + e.RequestEventArgs.AnimationDesired);
Log.Comment("RequestEventArgs.Handled=" + e.RequestEventArgs.Handled);
Log.Comment("RequestEventArgs.VerticalAlignmentRatio=" + e.RequestEventArgs.VerticalAlignmentRatio);
Log.Comment("RequestEventArgs.VerticalOffset=" + e.RequestEventArgs.VerticalOffset);
Log.Comment("RequestEventArgs.TargetRect=" + e.RequestEventArgs.TargetRect);
};
scroller.EffectiveViewportChanged += (o, args) =>
{
Log.Comment("Scroller.EffectiveViewportChanged: VerticalOffset=" + scroller.VerticalOffset);
};
root.Loaded += delegate {
rootLoadedEvent.Set();
};
Content = root;
});
Verify.IsTrue(rootLoadedEvent.WaitOne(DefaultWaitTimeInMS));
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
waitingForIndex = 101;
indexRealized.Reset();
repeater.GetOrCreateElement(100).StartBringIntoView(new BringIntoViewOptions {
VerticalAlignmentRatio = 0.0
});
repeater.UpdateLayout();
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTimeInMS));
IdleSynchronizer.Wait();
Verify.AreEqual(1, viewChangedOffsets.Count);
viewChangedOffsets.Clear();
Verify.IsTrue(indexRealized.WaitOne(DefaultWaitTimeInMS));
ValidateRealizedRange(repeater, 99, 106);
RunOnUIThread.Execute(() =>
{
Log.Comment("Scroll into view item 105 (already realized) w/ animation.");
waitingForIndex = 99;
repeater.TryGetElement(105).StartBringIntoView(new BringIntoViewOptions
{
VerticalAlignmentRatio = 0.5,
AnimationDesired = true
});
repeater.UpdateLayout();
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTimeInMS));
IdleSynchronizer.Wait();
Verify.IsLessThanOrEqual(1, viewChangedOffsets.Count);
viewChangedOffsets.Clear();
ValidateRealizedRange(repeater, 101, 109);
RunOnUIThread.Execute(() =>
{
Log.Comment("Scroll item 0 to the top w/ animation and 0.5 vertical alignment.");
waitingForIndex = 1;
indexRealized.Reset();
repeater.GetOrCreateElement(0).StartBringIntoView(new BringIntoViewOptions
{
VerticalAlignmentRatio = 0.5,
AnimationDesired = true
});
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTimeInMS));
IdleSynchronizer.Wait();
viewChangedOffsets.Clear();
Verify.IsTrue(indexRealized.WaitOne(DefaultWaitTimeInMS));
// Test Reliability fix. If offset is not 0 yet, give
// some more time for the animation to settle down.
double verticalOffset = 0;
RunOnUIThread.Execute(() =>
{
verticalOffset = scroller.VerticalOffset;
});
if (verticalOffset != 0)
{
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTimeInMS));
IdleSynchronizer.Wait();
viewChangedOffsets.Clear();
}
ValidateRealizedRange(repeater, 0, 6);
RunOnUIThread.Execute(() =>
{
// You can't align the first group in the middle obviously.
Verify.AreEqual(0, scroller.VerticalOffset);
Log.Comment("Scroll to item 20.");
waitingForIndex = 21;
indexRealized.Reset();
repeater.GetOrCreateElement(20).StartBringIntoView(new BringIntoViewOptions
{
VerticalAlignmentRatio = 0.0
});
repeater.UpdateLayout();
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTimeInMS));
IdleSynchronizer.Wait();
Verify.IsTrue(indexRealized.WaitOne(DefaultWaitTimeInMS));
ValidateRealizedRange(repeater, 19, 26);
}
private void MoveFocusToIndex(ItemsRepeater repeater, int index)
{
var element = repeater.TryGetElement(index) as Control;
element.Focus(FocusState.Programmatic);
}
// [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());
});
}