/// <summary>
/// Property changed callback for DataContext property
/// </summary>
private static void OnDataContextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
// Selector has a bug regarding DataContext change and SelectedItem property,
// where if the SelectedItem due to old DataContext is a valid item in ItemsSource
// but the SelectedItem due to new DataContext is not a valid item in ItemsSource,
// the SelectedIndex remains that of old context instead of changing to -1.
// This method is a workaround to that problem, since it is of high impact to DataGrid.
TextBlockPactComboBox combo = (TextBlockPactComboBox)d;
bool isLocalValue = (DependencyPropertyHelper.GetValueSource(combo, SelectedItemProperty).BaseValueSource == BaseValueSource.Local);
if (isLocalValue)
{
// Clear the selection and re-apply the binding.
BindingBase binding = BindingOperations.GetBindingBase(combo, SelectedItemProperty);
if (binding != null)
{
combo.ClearValue(SelectedItemProperty);
DataGridPactComboBoxColumn.ApplyBinding(binding, combo, SelectedItemProperty);
}
}
else
{
// Clear the selection by setting the local value
// and re-evaluate the property by clearing the local value.
combo.SelectedItem = null;
combo.ClearValue(SelectedItemProperty);
}
}
/// <summary>
/// Creates the visual tree for text based cells.
/// </summary>
protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
{
TextBlockPactComboBox PactComboBox = new TextBlockPactComboBox();
ApplyStyle(/* isEditing = */ false, /* defaultToElementStyle = */ false, PactComboBox);
ApplyColumnProperties(PactComboBox);
return(PactComboBox);
}
/// <summary>
/// Creates the visual tree for text based cells.
/// </summary>
protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
{
TextBlockPactComboBox PactComboBox = new TextBlockPactComboBox();
ApplyStyle(/* isEditing = */ false, /* defaultToElementStyle = */ false, PactComboBox);
ApplyColumnProperties(PactComboBox);
return PactComboBox;
}
