/// <summary>
/// Handles a change to the selected value.
/// </summary>
/// <param name="sender">The object that owns the property.</param>
/// <param name="e">Describes the changed selection.</param>
private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
// The 'SelectedValue' property of the base class was covered up with a new property that had the ability to remember
// the selected value and use it to select an item after the special list was initialized. This propogates the
// selected item up into the overriden property when the item is modified by the user.
BlotterComboBox comboBox = sender as BlotterComboBox;
if (comboBox.NullSafe(p => p.SelectedValue) != null)
{
this.SetValue(ComboBox.SelectedValueProperty, comboBox.SelectedValue);
}
}
/// <summary>
/// Handles a change to the SelectedValue property.
/// </summary>
/// <param name="dependencyObject">The object that owns the property.</param>
/// <param name="dependencyPropertyChangedEventArgs">A description of the changed property.</param>
private static void OnSelectedValueChanged(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
// Extract the strongly typed variables from the generic parameters.
BlotterComboBox viewerPrototype = dependencyObject as BlotterComboBox;
Object obj = dependencyPropertyChangedEventArgs.NewValue;
// The selected value of the base class is set here.
try
{
InputHelper.IsPropertyUpdate = true;
viewerPrototype.SetValue(ComboBox.SelectedValueProperty, obj);
}
finally
{
InputHelper.IsPropertyUpdate = false;
}
}