private static void OnSelectedValuePathChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TreeView tree = (TreeView)d;
SelectedValuePathBindingExpression.ClearValue(tree);
tree.UpdateSelectedValue(tree.SelectedItem);
}
/// <summary>
/// SelectedItemProperty property changed handler.
/// </summary>
/// <param name="d">TreeView that changed its SelectedItem.</param>
/// <param name="e">Event arguments.</param>
private static void OnSelectedItemPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TreeView source = d as TreeView;
// Ignore the change if requested
if (source._ignorePropertyChange)
{
source._ignorePropertyChange = false;
return;
}
// Ensure the property is only written when expected
if (!source._allowWrite)
{
// Reset the old value before it was incorrectly written
source._ignorePropertyChange = true;
source.SetValue(SelectedItemProperty, e.OldValue);
throw new InvalidOperationException(
Properties.Resources.TreeView_OnSelectedItemPropertyChanged_InvalidWrite);
}
source.UpdateSelectedValue(e.NewValue);
}
/// <summary>
/// SelectedValuePathProperty property changed handler.
/// </summary>
/// <param name="d">TreeView that changed its SelectedValuePath.</param>
/// <param name="e">Event arguments.</param>
private static void OnSelectedValuePathPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TreeView source = d as TreeView;
source.UpdateSelectedValue(source.SelectedItem);
}