//This event handler is called when a child element of the ObservableCanvas
//has a property that changes.
void CanvasSource_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
ObservableCanvas source = sender as ObservableCanvas;
if (source == null)
{
return;
}
CopyElements(source);
}
//This event handler is called when a child is added to or removed from
//the ObservableCanvas.
private void CanvasSource_VisualChildrenChanged(object sender, RoutedEventArgs e)
{
ObservableCanvas source = sender as ObservableCanvas;
if (source == null)
{
return;
}
CopyElements(source);
}
//This function creates a brand new copy of the ObservableCanvas's
//children and puts it into the target Canvas.
private void CopyElements(ObservableCanvas source)
{
if (CanvasTarget == null)
{
return;
}
CanvasTarget.Children.Clear(); //Start from scratch.
foreach (UIElement child in source.Children)
{
//We need to create a deep clone of the elements to they copy.
//This is necessary since we can't add the same child to two different
//UIlements.
UIElement clone = (UIElement)XamlReader.Parse(XamlWriter.Save(child));
CanvasTarget.Children.Add(clone);
}
}
