/// <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.
TextBlockComboBox combo = (TextBlockComboBox)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);
DataGridComboBoxColumn.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);
}
}
PactComboBox pcb = null;//= new PactComboBox() { FeatureID=1 };
/// <summary>
/// Creates the visual tree for text based cells.
/// </summary>
protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem)
{
//if (pcb == null)
pcb = new PactComboBox()
{
FeatureID = this.FeatureID
};
// SyncProperties(pcb);
//ApplyStyle(/* isEditing = */ true, /* defaultToElementStyle = */ false, textBox);
ApplyBinding(pcb, PactComboBox.TextProperty);
DataGridComboBoxColumn.ApplyBinding(SelectedValueBinding, pcb, PactComboBox.SelectedValueProperty);
pcb.SelectedValue = ((System.Data.DataRowView)(cell.RowDataItem)).Row[((System.Windows.Data.Binding)(SelectedValueBinding)).Path.Path].ToString();
if (pcb.SelectedValue.ToString().Length == 0)
{
pcb.SelectedValue = null;
}
return(pcb);
}