/// <summary>
/// Need to close current popup and open popup if current item has invalid property.
/// </summary>
/// <param name="sender">Ignored.</param>
/// <param name="e">DataGridItemCancelEventArgs.</param>
private void _CollectionViewSourceBeginningEdit(object sender, DataGridItemCancelEventArgs e)
{
// Do not show callout, when pointing on invalid cell.
_StopTimer();
// If callout pointing at another item - close it.
if (_InvalidItem != e.Item && _Callout.IsOpen)
{
_ClosePopup(true);
_callout = new Callout();
}
// Remember edited item and subscribe to it's property changed event.
_InvalidItem = e.Item as IDataErrorInfo;
(e.Item as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler
(_EditedItemPropertyChanged);
// If current column have error.
if (_dataGrid.CurrentColumn != null &&
!string.IsNullOrEmpty((e.Item as IDataErrorInfo)[_dataGrid.CurrentColumn.FieldName]))
{
// If callout is pointing at another column - close it.
if (_column != _dataGrid.CurrentColumn)
{
_ClosePopup(true);
_callout = new Callout();
}
// If callout closed - open it and point at current cell.
if (!_Callout.IsOpen)
{
// Detect column to show callout.
var column = _dataGrid.CurrentColumn;
if (Address.IsAddressPropertyName(column.FieldName))
column = _GetFirstAddressColumn();
_InitCallout(column);
}
}
// If callout closed - seek for item's invalid properties.
else if (!_Callout.IsOpen && !string.IsNullOrEmpty(_InvalidItem.Error))
_ShowCalloutOnInvalidItem(e.Item as IDataErrorInfo);
// Subscribe to cell property changed events. Doing so we will know when user change active cell.
DataRow row = _dataGrid.GetContainerFromItem(e.Item) as DataRow;
// If grid view is table flow - even in editing state row can be null.
if (row != null)
foreach (var cell in row.Cells)
cell.PropertyChanged += new PropertyChangedEventHandler(_CellPropertyChanged);
}
/// <summary>
/// Close current popup, set new popup to _callout field.
/// </summary>
/// <param name="animate">Animate closing or not.</param>
private void _ClosePopup(bool animate)
{
_Callout.Close(animate);
_callout = new Callout();
}