private void SetState(IVirtualList list, QueuedBackgroundWorkerState loadingState)
{
if (list == List && loadingState == LoadingState)
{
return;
}
List = list;
LoadingState = loadingState;
var loadingIndicator = LoadingIndicator;
var oldIsVisible = loadingIndicator != null;
var newIsVisible = LoadingState != QueuedBackgroundWorkerState.Standby;
if (oldIsVisible == newIsVisible)
{
if (newIsVisible)
{
loadingIndicator.SetState(List, LoadingState);
}
}
else if (newIsVisible)
{
AdornerManager.SetAdorner(_itemsControl, new VirtualListLoadingIndicator(List, LoadingState));
}
else
{
AdornerManager.SetAdorner(_itemsControl, null);
}
}
public void Dispose()
{
if (LoadingIndicator != null)
{
AdornerManager.SetAdorner(_itemsControl, null);
}
if (_itemsControl != null)
{
var dpd = DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, typeof(ItemsControl));
dpd.RemoveValueChanged(_itemsControl, OnItemsSourceChanged);
_itemsControl = null;
}
if (_list != null)
{
_list.LoadingStateChanged -= OnLoadingStateChanged;
_list = null;
}
_loadingState = QueuedBackgroundWorkerState.Standby;
GC.SuppressFinalize(this);
}