private void OnDataSourcesChanged(IEnumerable <IDataSourceViewModel> oldValue,
IEnumerable <IDataSourceViewModel> newValue)
{
var old = oldValue as INotifyCollectionChanged;
if (old != null)
{
old.CollectionChanged -= ItemsSourceOnCollectionChanged;
}
FilteredItemsSource.Clear();
if (newValue != null)
{
foreach (IDataSourceViewModel model in newValue)
{
if (PassesFilter(model))
{
FilteredItemsSource.Add(model);
}
}
var @new = newValue as INotifyCollectionChanged;
if (@new != null)
{
@new.CollectionChanged += ItemsSourceOnCollectionChanged;
}
}
}
private void FilterLoadFunction(object args)
{
RoutedEventArgs routedEventArgs = args as RoutedEventArgs;
DataGridColumnHeader columnHeader = (routedEventArgs.OriginalSource as ToggleExtend).GetParent <DataGridColumnHeader>();
DataGridColumn dataGridColumn = columnHeader.Column;
OptionColumnInfo = new OptionColumnInfo(dataGridColumn, DataGridExtend);
RoutedEventArgs routedEvent = new RoutedEventArgs(DataGridExtend.InitFilterColumnEvent, OptionColumnInfo.PropertyPath);
DataGridExtend.RaiseEvent(routedEvent);
ObservableCollection <FilterKeyValue> filter = new ObservableCollection <FilterKeyValue>();
if (FilteredItemsSource == null)
{
FilteredItemsSource = new ObservableCollection <FilterKeyValue>();
foreach (var item in DataGridExtend.FilteredItemsSource)
{
if (item is ICateoryFilter cateory)
{
FilterKeyValue filterKeyValue = new FilterKeyValue();
filterKeyValue.DiaplayValue = cateory.FilterColumnValue?.ToString();
filterKeyValue.ID = cateory.ID;
FilteredItemsSource.Add(filterKeyValue);
}
}
}
else
{
foreach (var item in DataGridExtend.FilteredItemsSource)
{
if (item is ICateoryFilter cateory)
{
if (FilteredItemsSource.Where(p => p.ID == cateory.ID).Count() > 0)
{
FilterKeyValue filterKeyValue = FilteredItemsSource.Where(p => p.ID == cateory.ID).ToList()[0];
filterKeyValue.DiaplayValue = cateory.FilterColumnValue?.ToString();
}
else
{
FilterKeyValue filterKeyValue = new FilterKeyValue();
filterKeyValue.DiaplayValue = cateory.FilterColumnValue?.ToString();
FilteredItemsSource.Add(filterKeyValue);
}
}
}
}
foreach (var item in FilteredItemsSource)
{
if (filter.Where(p => p.DiaplayValue == item.DiaplayValue).ToList().Count <= 0)
{
filter.Add(item);
}
}
CategoryFilter = filter;
}