private void Button_Click(object sender, RoutedEventArgs e)
{
//this.sbShowListViewItem.Begin();
// ATTN: Please note it's a "TrulyObservableCollection" that's instantiated. Otherwise, "Trades[0].Qty = 999" will NOT trigger event handler "Trades_CollectionChanged" in main.
// REF: http://stackoverflow.com/questions/8490533/notify-observablecollection-when-item-changes
TrulyObservableCollection<Trade> Trades = new TrulyObservableCollection<Trade>();
Trades.Add(new Trade { Symbol = "APPL", Qty = 123 });
Trades.Add(new Trade { Symbol = "IBM", Qty = 456 });
Trades.Add(new Trade { Symbol = "CSCO", Qty = 789 });
Trades.CollectionChanged += Trades_CollectionChanged;
//Trades.ItemPropertyChanged += PropertyChangedHandler;
Trades.RemoveAt(2);
Trades[0].Qty = 999;
}
/// <summary>
/// When an griditem is dropped
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MainView_DataGrid_Drop(object sender, System.Windows.DragEventArgs e)
{
_fileList = _viewModel.List;
if (rowIndex < 0)
{
return;
}
int index = this.GetCurrentRowIndex(e.GetPosition);
if (index < 0)
{
return;
}
if (index == rowIndex)
{
return;
}
if (index == MainView_DataGrid.Items.Count - 1)
{
System.Windows.MessageBox.Show("This row-index cannot be dropped");
return;
}
MyFile tempFile = MainView_DataGrid.SelectedItem as MyFile;
_fileList.RemoveAt(rowIndex);
_fileList.Insert(index, tempFile);
int i = 1;
foreach (MyFile file in _fileList)
{
file.Position = i;
i++;
}
_viewModel.List = _fileList;
MainView_DataGrid.ItemsSource = null;
MainView_DataGrid.ItemsSource = _viewModel.List;
}
public void ShouldRaiseEventWhenItemIsAddedRemovedOrEdited()
{
var eventRaised = false;
var collection = new TrulyObservableCollection <MockNotifiable>();
collection.CollectionChanged += (s, e) => eventRaised = true;
eventRaised = false;
collection.Add(new MockNotifiable());
Assert.That(eventRaised, Is.True);
eventRaised = false;
// The collection is supposed to raise the event if the property of one inner element is modified
// This is the only added feature to the genuine ObservableCollection<>
collection.First().Property = 100;
Assert.That(eventRaised, Is.True);
eventRaised = false;
collection.RemoveAt(0);
Assert.That(eventRaised, Is.True);
}