/// <summary>
/// Property changed handler for the AlignLastItems property.
/// </summary>
/// <param name="d">BalancedWrapPanel that changed.</param>
/// <param name="e">Event arguments.</param>
private static void OnAlignLastItemsPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
BalancedWrapPanel source = (BalancedWrapPanel)d;
// Only arrange is affected
source.InvalidateArrange();
}
private static void OnItemHeightOrWidthPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
BalancedWrapPanel source = (BalancedWrapPanel)d;
double value = (double)e.NewValue;
// Ignore the change if requested
if (source._ignorePropertyChange)
{
source._ignorePropertyChange = false;
return;
}
// Validate the length (which must either be NaN or a positive,
// finite number)
if (!value.IsNaN() && ((value <= 0.0) || double.IsPositiveInfinity(value)))
{
// Reset the property to its original state before throwing
source._ignorePropertyChange = true;
source.SetValue(e.Property, (double)e.OldValue);
string message = string.Format(
CultureInfo.InvariantCulture,
"Invalid length value '{0}'.",
value);
throw new ArgumentException(message, "value");
}
// The length properties affect measuring.
source.InvalidateMeasure();
}
private static void OnOrientationPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
BalancedWrapPanel source = (BalancedWrapPanel)d;
Orientation value = (Orientation)e.NewValue;
// Ignore the change if requested
if (source._ignorePropertyChange)
{
source._ignorePropertyChange = false;
return;
}
// Validate the Orientation
if ((value != Orientation.Horizontal) &&
(value != Orientation.Vertical))
{
// Reset the property to its original state before throwing
source._ignorePropertyChange = true;
source.SetValue(OrientationProperty, (Orientation)e.OldValue);
string message = string.Format(
CultureInfo.InvariantCulture,
"Invalid Orientation value '{0}'.",
value);
throw new ArgumentException(message, "value");
}
// Orientation affects measuring.
source.InvalidateMeasure();
}
