private static void OnFixUpdateChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
{
MapItemsControl mapItemsControl = target as MapItemsControl;
ItemsChangedEventHandler itemsChangedEventHandler = null;
itemsChangedEventHandler = (object sender, ItemsChangedEventArgs ea) =>
{
if (ea.Action == NotifyCollectionChangedAction.Add)
{
EventHandler statusChanged = null;
statusChanged = new EventHandler(delegate
{
if (mapItemsControl.ItemContainerGenerator.Status == GeneratorStatus.ContainersGenerated)
{
mapItemsControl.ItemContainerGenerator.StatusChanged -= statusChanged;
int index = ea.Position.Index + ea.Position.Offset;
ContentPresenter contentPresenter =
mapItemsControl.ItemContainerGenerator.ContainerFromIndex(index) as ContentPresenter;
if (VisualTreeHelper.GetChildrenCount(contentPresenter) == 1)
{
MapLayer mapLayer = GetVisualParent <MapLayer>(mapItemsControl);
mapLayer.ForceMeasure();
}
else
{
EventHandler layoutUpdated = null;
layoutUpdated = new EventHandler(delegate
{
if (VisualTreeHelper.GetChildrenCount(contentPresenter) == 1)
{
contentPresenter.LayoutUpdated -= layoutUpdated;
MapLayer mapLayer = GetVisualParent <MapLayer>(mapItemsControl);
mapLayer.ForceMeasure();
}
});
contentPresenter.LayoutUpdated += layoutUpdated;
}
}
});
mapItemsControl.ItemContainerGenerator.StatusChanged += statusChanged;
}
};
mapItemsControl.ItemContainerGenerator.ItemsChanged += itemsChangedEventHandler;
}