private async void OnViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
if (lvDialogs.ScrollingHost.ScrollableHeight - lvDialogs.ScrollingHost.VerticalOffset < 120)
{
if (ViewModel.IsFirstSliceLoaded)
{
ViewModel.UpdatingScrollMode = UpdatingScrollMode.KeepLastItemInView;
}
Arrow.Visibility = Visibility.Collapsed;
}
else
{
Arrow.Visibility = Visibility.Visible;
}
//if (ViewModel.Peer is TLInputPeerUser)
//{
// lvDialogs.ScrollingHost.ViewChanged -= OnViewChanged;
// return;
//}
var index0 = _panel.FirstVisibleIndex;
var index1 = _panel.LastVisibleIndex;
var show = false;
var date = DateTime.Now;
var message0 = default(TLMessageCommonBase);
if (index0 > -1 && index1 > -1 /*&& (index0 != _lastIndex0 || index1 != _lastIndex1)*/)
{
//var container0 = lvDialogs.ContainerFromIndex(index0);
//if (container0 != null)
//{
// var item0 = lvDialogs.ItemFromContainer(container0);
// if (item0 != null)
// {
// message0 = item0 as TLMessageCommonBase;
// var date0 = BindConvert.Current.DateTime(message0.Date);
// var service0 = message0 as TLMessageService;
// if (service0 != null)
// {
// show = !(service0.Action is TLMessageActionDate);
// }
// else
// {
// show = true;
// }
// date = date0.Date;
// }
//}
var messageIds = new TLVector <int>();
var dialog = ViewModel.Dialog;
var channel = ViewModel.With as TLChannel;
for (int i = index0; i <= index1; i++)
{
var container = lvDialogs.ContainerFromIndex(i);
if (container != null)
{
var item = lvDialogs.ItemFromContainer(container);
if (item != null && item is TLMessageCommonBase commonMessage && !commonMessage.IsOut && commonMessage.IsMentioned && commonMessage.IsMediaUnread && channel.IsMegaGroup)
{
commonMessage.IsMediaUnread = false;
commonMessage.RaisePropertyChanged(() => commonMessage.IsMediaUnread);
if (dialog != null)
{
dialog.UnreadMentionsCount = Math.Max(0, dialog.UnreadMentionsCount - 1);
}
messageIds.Add(commonMessage.Id);
}
}
}
if (messageIds.Count > 0)
{
ViewModel.ProtoService.ReadMessageContentsAsync(channel.ToInputChannel(), messageIds, null);
}
#region OLD
//////Cache();
////Cache(index0 + 1, index1);
////var itemsPerGroup = 0;
////var compositor = ElementCompositionPreview.GetElementVisual(lvDialogs);
////var props = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(lvDialogs.ScrollingHost);
////for (int i = index1; i >= index0; i--)
////{
//// var container = lvDialogs.ContainerFromIndex(i) as ListViewItem;
//// if (container != null)
//// {
//// var item = container.Content as TLMessage;
//// if (item != null && (item.IsFirst || i == index0) && (!item.IsOut || item.IsPost))
//// {
//// var text = "0";
//// if (i == 0)
//// {
//// _wasFirst[i] = true;
//// text = "Max(0, Reference.Y + Scrolling.Translation.Y)"; // Compression effect
//// text = "0";
//// }
//// else if (i == index0 && itemsPerGroup > 0)
//// {
//// _wasFirst[i] = true;
//// text = "0";
//// }
//// else if (i == index0)
//// {
//// _wasFirst[i] = true;
//// text = "Min(0, Reference.Y + Scrolling.Translation.Y)";
//// }
//// else
//// {
//// text = "Reference.Y + Scrolling.Translation.Y";
//// }
//// var visual = ElementCompositionPreview.GetElementVisual(container);
//// var offset = visual.Offset;
//// if (offset.Y == 0)
//// {
//// var transform = container.TransformToVisual(lvDialogs);
//// var point = transform.TransformPoint(new Point());
//// offset = new Vector3(0, (float)point.Y, 0);
//// }
//// var expression = visual.Compositor.CreateExpressionAnimation(text);
//// expression.SetVector3Parameter("Reference", offset); //visual.Offset);
//// expression.SetReferenceParameter("Scrolling", props);
//// if (_inUse.ContainsKey(i) && _wasFirst.ContainsKey(i) && i != index0)
//// {
//// _wasFirst.Remove(i);
//// var border = _inUse[i] as Border;
//// var ellipse = ElementCompositionPreview.GetElementVisual(border.Child);
//// ellipse.StopAnimation("Offset.Y");
//// ellipse.StartAnimation("Offset.Y", expression);
//// }
//// else if (!_inUse.ContainsKey(i))
//// {
//// var ellipse = Push(i, item.FromId ?? 0, item);
//// ellipse.StopAnimation("Offset.Y");
//// ellipse.StartAnimation("Offset.Y", expression);
//// }
//// itemsPerGroup = 0;
//// }
//// else if (item != null && item.IsOut)
//// {
//// }
//// else
//// {
//// itemsPerGroup++;
//// }
//// }
////}
#endregion
//Update();
}
if (show)
{
var paragraph = new Paragraph();
paragraph.Inlines.Add(new Run {
Text = DateTimeToFormatConverter.ConvertDayGrouping(date)
});
DateHeader.DataContext = message0;
DateHeader.Visibility = Visibility.Visible;
DateHeaderLabel.Blocks.Clear();
DateHeaderLabel.Blocks.Add(paragraph);
}
else
{
DateHeader.Visibility = Visibility.Collapsed;
}
if (e.IsIntermediate == false)
{
await Task.Delay(4000);
DateHeader.Visibility = Visibility.Collapsed;
}
}
private void UpdateHeaderDate(bool intermediate)
{
var panel = Messages.ItemsPanelRoot as ItemsStackPanel;
if (panel == null || panel.FirstVisibleIndex < 0)
{
return;
}
var top = 0d;
var bottom = 0d;
var knockout = SettingsService.Current.Diagnostics.BubbleKnockout;
var start = knockout ? panel.FirstCacheIndex : panel.FirstVisibleIndex;
var end = knockout ? panel.LastCacheIndex : panel.LastVisibleIndex;
var minKnock = knockout;
var minItem = true;
var minDate = true;
for (int i = start; i <= end; i++)
{
var container = Messages.ContainerFromIndex(i) as SelectorItem;
if (container == null)
{
continue;
}
var message = Messages.ItemFromContainer(container) as MessageViewModel;
if (message == null)
{
continue;
}
if (minKnock)
{
var negative = Messages.TransformToVisual(container);
var relative = negative.TransformPoint(new Point());
top = relative.Y;
bottom = relative.Y + Messages.ActualHeight;
minKnock = false;
}
if (minItem && i >= panel.FirstVisibleIndex)
{
var transform = container.TransformToVisual(DateHeaderRelative);
var point = transform.TransformPoint(new Point());
if (point.Y + container.ActualHeight >= 0)
{
minItem = false;
if (message.SchedulingState is MessageSchedulingStateSendAtDate sendAtDate)
{
DateHeaderLabel.Text = string.Format(Strings.Resources.MessageScheduledOn, DateTimeToFormatConverter.ConvertDayGrouping(Utils.UnixTimestampToDateTime(sendAtDate.SendDate)));
}
else if (message.SchedulingState is MessageSchedulingStateSendWhenOnline)
{
DateHeaderLabel.Text = Strings.Resources.MessageScheduledUntilOnline;
}
else
{
DateHeaderLabel.Text = DateTimeToFormatConverter.ConvertDayGrouping(Utils.UnixTimestampToDateTime(message.Date));
}
}
}
if (message.Content is MessageHeaderDate && minDate && i >= panel.FirstVisibleIndex)
{
var transform = container.TransformToVisual(DateHeaderRelative);
var point = transform.TransformPoint(new Point());
var height = (float)DateHeader.ActualHeight;
var offset = (float)point.Y + height;
minDate = false;
if (offset >= 0 && offset < height)
{
container.Opacity = 0;
}
else
{
container.Opacity = 1;
}
if (offset >= height && offset < height * 2)
{
_dateHeader.Offset = new Vector3(0, -height * 2 + offset, 0);
}
else
{
_dateHeader.Offset = new Vector3();
}
}
else
{
container.Opacity = 1;
}
if (knockout && container.ContentTemplateRoot is MessageBubble bubble)
{
bubble.UpdateKnockout(top / container.ActualHeight, bottom / container.ActualHeight);
}
top -= container.ActualHeight;
bottom -= container.ActualHeight;
}
_dateHeaderTimer.Stop();
_dateHeaderTimer.Start();
VisualUtilities.SetIsVisible(DateHeaderPanel, true);
}