private void EndDataUpdate(DataProviderStatusChangedEventArgs e)
{
if (e.NewStatus == DataProviderStatus.Faulted || e.NewStatus == DataProviderStatus.Uninitialized)
{
this.layoutController.ScheduleCleanUp();
this.ResumeUpdateService(ListView.UpdateFlags.AllButData);
return;
}
if (!this.isDataProviderUpdating)
{
// System.Diagnostics.Debug.Assert(false, "Flag not raised properly.");
return;
}
if (e.NewStatus != DataProviderStatus.Ready || !e.ResultsChanged)
{
return;
}
//// NOTE: This call comes from another thread and everything related to the UI should be dispatched on the UI thread.
//// It will also clear the IndexTree which will definitely throw NullReference exception if some UI operation is requested before Dispatcher is invoked.
//// To solve this issue it will be better to create new Layout class and replace the existing one when dispatched to the Main thread.
//// this.SetLayoutSource();
this.View.UpdateService.DispatchOnUIThread(
true,
() =>
{
if (this.CurrentDataProvider.Status != DataProviderStatus.Ready)
{
// This may happen if during the Dispatching on UI thread we have a change in the provider - e.g. ItemsSource change.
return;
}
if (this.hasPendingDataRefresh)
{
this.hasPendingDataRefresh = false;
this.RefreshData();
return;
}
this.SetLayoutSource();
this.RestoreCollapsedState();
ListView.UpdateFlags uiUpdateflags = ListView.UpdateFlags.AffectsContent;
this.dataChangeFlags = DataChangeFlags.None;
this.isDataProviderUpdating = false;
System.Diagnostics.Debug.Assert(!uiUpdateflags.HasFlag(ListView.UpdateFlags.AffectsData), "The AffectsData flag should not be raised here!");
this.ResumeUpdateService(uiUpdateflags);
this.NotifyView(this.CurrentDataProvider.Status);
});
}
private void ResumeUpdateService(ListView.UpdateFlags flags)
{
this.View.UpdateService.RegisterUpdate((int)flags);
this.View.UpdateService.ResumeUpdates();
}
internal void OnUpdate(ListView.UpdateFlags updateFlags)
{
this.layoutController.OnUpdate(updateFlags);
}
