// [TestMethod] Temporarily disabled for bug 18866003
public void ValidateItemsRepeaterScrollHostScenario()
{
var realizationRects = new List <Rect>();
var scrollViewer = (ScrollViewer)null;
var viewChangedEvent = new ManualResetEvent(false);
int waitTime = 2000; // 2 seconds
RunOnUIThread.Execute(() =>
{
var repeater = new ItemsRepeater()
{
Layout = GetMonitoringLayout(new Size(500, 600), realizationRects),
HorizontalCacheLength = 0.0,
VerticalCacheLength = 0.0
};
scrollViewer = new ScrollViewer
{
Content = repeater,
HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden,
VerticalScrollBarVisibility = ScrollBarVisibility.Hidden,
};
scrollViewer.ViewChanged += (sender, args) =>
{
if (!args.IsIntermediate)
{
viewChangedEvent.Set();
}
};
var tracker = new ItemsRepeaterScrollHost()
{
Width = 200,
Height = 300,
ScrollViewer = scrollViewer
};
Content = tracker;
Content.UpdateLayout();
// First layout pass will invalidate measure during the first arrange
// so that we can get a viewport during the second measure/arrange pass.
// That's why Measure gets invoked twice.
// After that, ScrollViewer.SizeChanged is raised and it also invalidates
// layout (third pass).
Verify.AreEqual(3, realizationRects.Count);
Verify.AreEqual(new Rect(0, 0, 0, 0), realizationRects[0]);
Verify.AreEqual(new Rect(0, 0, 200, 300), realizationRects[1]);
Verify.AreEqual(new Rect(0, 0, 200, 300), realizationRects[2]);
realizationRects.Clear();
viewChangedEvent.Reset();
scrollViewer.ChangeView(null, 100.0, 1.0f, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(waitTime), "Waiting for view changed");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(new Rect(0, 100, 200, 300), realizationRects.Last());
realizationRects.Clear();
viewChangedEvent.Reset();
// Max viewport offset is (300, 400). Horizontal viewport offset
// is expected to get coerced from 400 to 300.
scrollViewer.ChangeView(400, 100.0, 1.0f, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(waitTime), "Waiting for view changed");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(new Rect(300, 100, 200, 300), realizationRects.Last());
realizationRects.Clear();
viewChangedEvent.Reset();
scrollViewer.ChangeView(null, null, 2.0f, disableAnimation: true);
});
Verify.IsTrue(viewChangedEvent.WaitOne(waitTime), "Waiting for view changed");
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Verify.AreEqual(new Rect(300, 100, 100, 150), realizationRects.Last());
realizationRects.Clear();
});
}
public void BringIntoViewOfExistingItemsDoesNotChangeScrollOffset()
{
System.Windows.Controls.ScrollViewerEx scrollViewer = null;
ItemsRepeater repeater = null;
AutoResetEvent scrollViewerScrolledEvent = new AutoResetEvent(false);
RunOnUIThread.Execute(() =>
{
repeater = new ItemsRepeater();
repeater.ItemsSource = Enumerable.Range(0, 100).Select(x => x.ToString()).ToList();
scrollViewer = new System.Windows.Controls.ScrollViewerEx()
{
Content = repeater,
MaxHeight = 400,
MaxWidth = 200
};
Content = scrollViewer;
Content.UpdateLayout();
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Log.Comment("Scroll to end");
scrollViewer.ViewChanged += (object sender, ScrollViewerViewChangedEventArgs e) =>
{
if (!e.IsIntermediate)
{
Log.Comment("ScrollViewer scrolling finished");
scrollViewerScrolledEvent.Set();
}
};
scrollViewer.ChangeView(null, repeater.ActualHeight, null);
scrollViewer.UpdateLayout();
});
Log.Comment("Wait for scrolling");
if (Debugger.IsAttached)
{
scrollViewerScrolledEvent.WaitOne();
}
else
{
if (!scrollViewerScrolledEvent.WaitOne(TimeSpan.FromMilliseconds(5000)))
{
throw new Exception("Timeout expiration in WaitForEvent.");
}
}
IdleSynchronizer.Wait();
double endOfScrollOffset = 0;
RunOnUIThread.Execute(() =>
{
Log.Comment("Determine scrolled offset");
endOfScrollOffset = scrollViewer.VerticalOffset;
// Idea: we might not have scrolled to the end, however we should at least have moved so much that the end is not too far away
Verify.IsTrue(Math.Abs(endOfScrollOffset - repeater.ActualHeight) < 500, $"We should at least have scrolled some amount. " +
$"ScrollOffset:{endOfScrollOffset} Repeater height: {repeater.ActualHeight}");
var lastItem = (FrameworkElement)repeater.GetOrCreateElement(99);
lastItem.UpdateLayout();
Log.Comment("Bring last element into view");
lastItem.BringIntoView();
});
IdleSynchronizer.Wait();
RunOnUIThread.Execute(() =>
{
Log.Comment("Verify position did not change");
Verify.IsTrue(Math.Abs(endOfScrollOffset - scrollViewer.VerticalOffset) < 1);
});
}