private void OnViewSizeChanged(object sender, SizeChangedEventArgs e)
{
if (Messages.ScrollingHost.ScrollableHeight > 0)
{
return;
}
//Arrow.Visibility = Visibility.Collapsed;
VisualUtilities.SetIsVisible(Arrow, false);
ViewVisibleMessages(false);
UpdateHeaderDate(false);
}
private void OnViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
if (Messages.ScrollingHost.ScrollableHeight - Messages.ScrollingHost.VerticalOffset < 120 && ViewModel.IsFirstSliceLoaded != false)
{
//Arrow.Visibility = Visibility.Collapsed;
VisualUtilities.SetIsVisible(Arrow, false);
}
else
{
//Arrow.Visibility = Visibility.Visible;
VisualUtilities.SetIsVisible(Arrow, true);
}
ViewVisibleMessages(e.IsIntermediate);
UpdateHeaderDate(e.IsIntermediate);
}
private void UpdateHeaderDate(bool intermediate)
{
var panel = Messages.ItemsPanelRoot as ItemsStackPanel;
if (panel == null || panel.FirstVisibleIndex < 0)
{
return;
}
var minItem = true;
var minDate = true;
for (int i = panel.FirstVisibleIndex; i <= panel.LastVisibleIndex; i++)
{
var container = Messages.ContainerFromIndex(i) as SelectorItem;
if (container == null)
{
continue;
}
var message = Messages.ItemFromContainer(container) as MessageViewModel;
if (message == null)
{
continue;
}
if (minItem)
{
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)
{
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;
}
}
_dateHeaderTimer.Stop();
_dateHeaderTimer.Start();
VisualUtilities.SetIsVisible(DateHeaderPanel, true);
}
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);
}