VideoPanelItem getFirstBlankItem()
{
List <ItemSequence> list = new List <ItemSequence>();
for (int i = 0; i < gridMain.Children.Count; i++)
{
VideoPanelItem item = gridMain.Children[i] as VideoPanelItem;
int split = ViewModel.SplitScreenData.Split;
if (item != null && !item.IsPlaying)
{
int row = (int)item.GetValue(Grid.RowProperty);
int col = (int)item.GetValue(Grid.ColumnProperty);
list.Add(new ItemSequence(item, row * split + col));
}
}
list = list.OrderBy(e => e.SerialNumber).ToList();
return(list.FirstOrDefault()?.PanelItem);
}
