public void ValidateGetElementAtCachingForLayout()
{
List <int> data = Enumerable.Range(0, 15).ToList();
ItemsSourceView dataSource = null;
RunOnUIThread.Execute(() => dataSource = new InspectingDataSource(data));
ScrollViewer scrollViewer = null;
var repeater = SetupRepeater(dataSource, null /*layout*/, out scrollViewer);
bool layoutRan = false;
RunOnUIThread.Execute(() =>
{
var layout = new MockVirtualizingLayout();
layout.MeasureLayoutFunc = (availableSize, context) =>
{
Verify.AreEqual(15, context.ItemCount);
var element0 = context.GetOrCreateElementAt(0);
Verify.IsNotNull(element0);
var element1 = context.GetOrCreateElementAt(1);
Verify.IsNotNull(element1);
Verify.AreNotSame(element0, element1);
var element1again = context.GetOrCreateElementAt(1);
Verify.AreSame(element1, element1again);
var element10 = context.GetOrCreateElementAt(10);
Verify.IsNotNull(element10);
Verify.AreNotSame(element0, element10);
Verify.AreNotSame(element1, element10);
context.RecycleElement(element1);
var element0New = context.GetOrCreateElementAt(0);
Verify.AreSame(element0, element0New);
context.RecycleElement(element10);
context.RecycleElement(element0);
layoutRan = true;
return(new Size(10, 10));
};
repeater.Layout = layout;
repeater.UpdateLayout();
Verify.IsTrue(layoutRan);
});
IdleSynchronizer.Wait();
}
// The raw data is from MenuItems or MenuItemsSource
internal void SetDataSource(object rawData)
{
if (ShouldChangeDataSource(rawData)) // avoid to create multiple of datasource for the same raw data
{
ItemsSourceView dataSource = null;
if (rawData != null)
{
dataSource = new InspectingDataSource(rawData);
}
ChangeDataSource(dataSource);
m_rawDataSource = rawData;
if (dataSource != null)
{
MoveAllItemsToPrimaryList();
}
}
}
public void ValidateElementClearingOrderFromFlowLayout()
{
ItemsSourceView dataSource = null;
RunOnUIThread.Execute(() => dataSource = new InspectingDataSource(Enumerable.Range(0, 15).ToList()));
ScrollViewer scrollViewer = null;
var repeater = SetupRepeater(dataSource, null /*layout*/, out scrollViewer);
List <int> clearedIndices = new List <int>();
var viewChangedEvent = new ManualResetEvent(false);
RunOnUIThread.Execute(() =>
{
scrollViewer.ViewChanged += (sender, args) =>
{
if (!args.IsIntermediate)
{
viewChangedEvent.Set();
}
};
repeater.Layout = new StackLayout();
repeater.ElementPrepared += (sender, args) =>
{
((FrameworkElement)args.Element).Height = 20;
};
repeater.UpdateLayout();
repeater.ElementClearing += (sender, args) =>
{
int index = repeater.GetElementIndex(args.Element);
Log.Comment("Clearing.." + index);
clearedIndices.Add(index);
};
scrollViewer.ChangeView(null, 100.0, null, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTime), "Waiting for ViewChanged.");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
// Validate order is 0, 1, 2, 3
for (int i = 0; i < 4; i++)
{
Verify.AreEqual(i, clearedIndices[i]);
}
clearedIndices.Clear();
viewChangedEvent.Reset();
scrollViewer.ChangeView(null, 0.0, null, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(DefaultWaitTime), "Waiting for ViewChanged.");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
// Validate order is backwards 14, 13, 12, 11
for (int i = 0; i < 4; i++)
{
Verify.AreEqual(14 - i, clearedIndices[i]);
}
});
}
