private void OnLoaded(object sender, RoutedEventArgs e)
{
var scrollViewer = ScrollingHost as ScrollViewer;
if (scrollViewer == null && ScrollingHost != null)
{
scrollViewer = ScrollingHost.Descendants <ScrollViewer>().FirstOrDefault() as ScrollViewer;
}
if (scrollViewer == null)
{
return;
}
var props = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollViewer);
if (props == null)
{
return;
}
if (VerticalAlignment == VerticalAlignment.Top)
{
_animation = _compositor.CreateExpressionAnimation("Max(Scroll.Translation.Y, 0)");
_animation.SetReferenceParameter("Scroll", props);
_visual.StopAnimation("Size.Y");
_visual.StartAnimation("Size.Y", _animation);
}
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
var scrollViewer = ScrollingHost as ScrollViewer;
if (scrollViewer == null && ScrollingHost != null)
{
scrollViewer = ScrollingHost.Descendants <ScrollViewer>().FirstOrDefault();
}
if (scrollViewer == null || _topScrim == null || _bottomScrim == null)
{
return;
}
_scrollViewer = scrollViewer;
_propertySet = Window.Current.Compositor.CreatePropertySet();
_propertySet.InsertScalar("ScrollableHeight", (float)scrollViewer.ScrollableHeight);
var top = ElementCompositionPreview.GetElementVisual(_topScrim);
var bottom = ElementCompositionPreview.GetElementVisual(_bottomScrim);
var props = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollViewer);
var topAnimation = Window.Current.Compositor.CreateExpressionAnimation("Min(-(Scroll.Translation.Y / 32), 1)");
topAnimation.SetReferenceParameter("Scroll", props);
topAnimation.SetReferenceParameter("Props", _propertySet);
var bottomAnimation = Window.Current.Compositor.CreateExpressionAnimation("Min((Props.ScrollableHeight + Scroll.Translation.Y) / 32, 1)");
bottomAnimation.SetReferenceParameter("Scroll", props);
bottomAnimation.SetReferenceParameter("Props", _propertySet);
top.StartAnimation("Scale.Y", topAnimation);
bottom.StartAnimation("Scale.Y", bottomAnimation);
bottom.CenterPoint = new Vector3(0, 32, 0);
if (scrollViewer.Content is FrameworkElement element)
{
element.SizeChanged += OnSizeChanged;
}
}
private async void Hyperlink_Click(TLTextUrl urlText)
{
if (urlText.WebPageId == _webpageId)
{
var fragmentStart = urlText.Url.IndexOf('#');
if (fragmentStart > 0)
{
var name = urlText.Url.Substring(fragmentStart + 1);
if (_anchors.TryGetValue(name, out Border anchor))
{
ScrollingHost.ScrollIntoView(anchor);
//anchor.StartBringIntoView();
return;
if (_scrollingHost == null)
{
_scrollingHost = ScrollingHost.Descendants <ScrollViewer>().FirstOrDefault() as ScrollViewer;
}
if (_scrollingHost != null)
{
var transform = anchor.TransformToVisual(ScrollingHost.ItemsPanelRoot);
var position = transform.TransformPoint(new Point());
_scrollingHost.ChangeView(null, Math.Max(0, position.Y - 8), null, false);
}
}
}
}
else if (urlText.WebPageId != 0)
{
var protoService = (MTProtoService)MTProtoService.Current;
protoService.SendInformativeMessageInternal <TLWebPageBase>("messages.getWebPage", new TLMessagesGetWebPage {
Url = urlText.Url, Hash = 0
},
result =>
{
Execute.BeginOnUIThread(() =>
{
ViewModel.NavigationService.Navigate(typeof(InstantPage), result);
});
},
fault =>
{
Debugger.Break();
});
}
else
{
var url = urlText.Url;
if (url.StartsWith("http") == false)
{
url = "http://" + url;
}
if (Uri.TryCreate(url, UriKind.Absolute, out Uri uri))
{
if (MessageHelper.IsTelegramUrl(uri))
{
MessageHelper.HandleTelegramUrl(urlText.Url);
}
else
{
await Launcher.LaunchUriAsync(uri);
}
}
}
}