/// <summary>
/// Gets a <see cref="T:Windows.UI.Xaml.Controls.ComboBox"/> control that is bound to the column's ItemsSource collection.
/// </summary>
/// <param name="cell">The cell that will contain the generated element.</param>
/// <param name="dataItem">The data item represented by the row that contains the intended cell.</param>
/// <returns>A new <see cref="T:Windows.UI.Xaml.Controls.ComboBox"/> control that is bound to the column's ItemsSource collection.</returns>
protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem)
{
EnsureColumnBinding(dataItem);
EnsureDisplayMemberPathExists();
EnsureItemsSourceBinding();
var comboBox = new ComboBox
{
Margin = default(Thickness),
HorizontalAlignment = HorizontalAlignment.Stretch,
VerticalAlignment = VerticalAlignment.Center
};
if (dataItem != null)
{
var value = dataItem.GetType().GetProperty(Binding.Path.Path).GetValue(dataItem);
var selection = !string.IsNullOrEmpty(DisplayMemberPath)
? ItemsSource?.Cast <object>().FirstOrDefault(x => x.GetType().GetProperty(Binding.Path.Path).GetValue(x).Equals(value))
: ItemsSource?.Cast <object>().FirstOrDefault(x => x.Equals(value));
comboBox.SelectedItem = selection;
}
var itemsSourceBinding = new Binding
{
Source = this,
Path = new PropertyPath(DATAGRIDCOMBOBOXCOLUMN_itemsSourceName)
};
var displayMemberPathBinding = new Binding
{
Source = this,
Path = new PropertyPath(DATAGRIDCOMBOBOXCOLUMN_displayMemberPathName)
};
comboBox.SetBinding(ComboBox.ItemsSourceProperty, itemsSourceBinding);
comboBox.SetBinding(ComboBox.DisplayMemberPathProperty, displayMemberPathBinding);
if (DependencyProperty.UnsetValue != ReadLocalValue(DataGridComboBoxColumn.FontFamilyProperty))
{
comboBox.FontFamily = FontFamily;
}
if (_fontSize.HasValue)
{
comboBox.FontSize = _fontSize.Value;
}
if (_fontStyle.HasValue)
{
comboBox.FontStyle = _fontStyle.Value;
}
if (_fontWeight.HasValue)
{
comboBox.FontWeight = _fontWeight.Value;
}
RefreshForeground(comboBox, (cell != null & cell.OwningRow != null) ? cell.OwningRow.ComputedForeground : null);
comboBox.SelectionChanged += (sender, args) =>
{
var item = args.AddedItems.FirstOrDefault();
if (item != null)
{
var newValue = !string.IsNullOrEmpty(DisplayMemberPath)
? item.GetType().GetProperty(Binding.Path.Path).GetValue(item)
: item;
if (dataItem != null)
{
dataItem.GetType().GetProperty(Binding.Path.Path).SetValue(dataItem, newValue);
}
else
{
var dataType = OwningGrid.ItemsSource.GetItemType();
var newDataItem = Activator.CreateInstance(dataType);
dataType.GetProperty(Binding.Path.Path).SetValue(newDataItem, newValue);
dataItem = newDataItem;
}
}
};
return(comboBox);
}
internal DataGridCellEventArgs(DataGridCell dataGridCell)
{
Debug.Assert(dataGridCell != null, "Expected non-null dataGridCell parameter.");
this.Cell = dataGridCell;
}
protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem)
{
return(null);
}