private UIElement CreateContainer(object item)
{
var picture = new ProfilePicture();
picture.IsEnabled = false;
picture.Width = _itemSize;
picture.Height = _itemSize;
if (item is MessageSender sender)
{
RecentUserHeadChanged?.Invoke(picture, sender);
}
var borderBrush = new Binding();
borderBrush.Source = this;
borderBrush.Path = new PropertyPath(nameof(BorderBrush));
var container = new Border();
container.Width = _itemSize + 4;
container.Height = _itemSize + 4;
container.VerticalAlignment = VerticalAlignment.Top;
container.HorizontalAlignment = HorizontalAlignment.Left;
container.BorderThickness = new Thickness(2);
container.CornerRadius = new CornerRadius((_itemSize + 4) / 2);
container.Child = picture;
container.Tag = item;
container.SetBinding(Border.BorderBrushProperty, borderBrush);
return(container);
}
private void UpdateContainer(UIElement container, int newIndex)
{
if (_items.Count > newIndex &&
container is Border border &&
border.Child is ProfilePicture picture &&
border.Tag is MessageSender previous)
{
if (_items[newIndex] is MessageSender sender && !sender.IsEqual(previous))
{
RecentUserHeadChanged?.Invoke(picture, sender);
}
}
}