/// <summary>
/// StretchProperty property changed handler.
/// </summary>
/// <param name="d">Viewbox that changed its Stretch.</param>
/// <param name="e">Event arguments.</param>
private static void OnStretchPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Viewbox vb = (Viewbox)d;
if (!IsValidStretchValue(e.NewValue))
{
// revert the change
vb.Stretch = (Stretch)e.OldValue;
throw new ArgumentException();
}
// The Stretch property affects measuring
vb.InvalidateMeasure();
}
/// <summary>
/// StretchDirectionProperty property changed handler.
/// </summary>
/// <param name="d">Viewbox that changed its StretchDirection.</param>
/// <param name="e">Event arguments.</param>
private static void OnStretchDirectionPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Viewbox vb = (Viewbox)d;
if (!IsValidStretchDirectionValue(e.NewValue))
{
// revert the change
vb.StretchDirection = (StretchDirection)e.OldValue;
// throw exception
string message = string.Format(
CultureInfo.InvariantCulture,
Properties.Resources.Viewbox_OnStretchDirectionPropertyChanged_InvalidValue,
e.NewValue);
throw new ArgumentException(message, "e");
}
// The StretchDirection property affects measuring
vb.InvalidateMeasure();
}
