private void onDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
VideoItemViewModel oldModel = e.OldValue as VideoItemViewModel;
loadObservable(oldModel, false);
VideoItemViewModel newModel = e.NewValue as VideoItemViewModel;
loadObservable(newModel, true);
loadUI();
}
void loadObservable(VideoItemViewModel model, bool isPlus)
{
if (model == null)
{
return;
}
if (isPlus)
{
model.PropertyChanged += onPropertyChanged;
model.PlusSignModel.PropertyChanged += plusSignPropertyChanged;
model.SearchedResultModel.PropertyChanged += searcherPropertyChanged;
model.ControlViewModel.PropertyChanged += controlPropertyChanged;
}
else
{
model.PropertyChanged -= onPropertyChanged;
model.PlusSignModel.PropertyChanged -= plusSignPropertyChanged;
model.SearchedResultModel.PropertyChanged -= searcherPropertyChanged;
model.ControlViewModel.PropertyChanged -= controlPropertyChanged;
}
}