private void ClearContextMenu()
{
MessageBubble parent = this.FindParent <MessageBubble>();
if (parent != null)
{
ContextMenu = parent.ContextMenu;
}
else if (ContextMenu != null)
{
ContextMenu.Items.Clear();
}
}
private void sv_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
bool enableShit = true;
if (enableShit)
{
ScrollViewer sv = sender as ScrollViewer;
var visibleItems = new List <int>();
Rect svViewportBounds = new Rect(sv.HorizontalOffset, sv.VerticalOffset, sv.ViewportWidth, sv.ViewportHeight);
for (int i = 0; i < Items.Count; ++i)
{
ContentPresenter container = this.ItemContainerGenerator.ContainerFromIndex(i) as ContentPresenter;
if (container != null)
{
var offset = VisualTreeHelper.GetOffset(container);
var bounds = new Rect(offset.X, offset.Y, container.ActualWidth, container.ActualHeight);
ChatUserMessage message = container.Content as ChatUserMessage;
if (message != null)
{
MessageBubble messageBubble = VisualTreeHelper.GetChild(container, 0) as MessageBubble;
if (messageBubble != null)
{
if (svViewportBounds.IntersectsWith(bounds))
{
ImageBehavior.SetIsInView(messageBubble, true);
}
else
{
ImageBehavior.SetIsInView(messageBubble, false);
}
}
}
}
}
}
}