Hi Stoyo,

I still have AutoRoute enabled because disabling and enabling again had some side effects.

I tried your second proposal and changed the code as follows:

    if (item.InnerControlPoints.Count > 0 && ControlPoints.Count > 1)
    {
        Point firstPoint = ControlPoints[0];
        Point lastPoint = ControlPoints[ControlPoints.Count - 1];

        ControlPoints.Clear();
        ControlPoints.Add(firstPoint);
        for (int i = 0; i < item.InnerControlPoints.Count; i++)
        {
            ControlPoints.Add(item.InnerControlPoints[i]);
        }
        ControlPoints.Add(lastPoint);

        //// SegmentCount can only be changed when AutoRoute == false
        //// Set diagram.RouteLinks to false and back to true in
        //SegmentCount = (short)(item.InnerControlPoints.Count + 1);

        //ControlPoints[0] = firstPoint;
        //ControlPoints[ControlPoints.Count - 1] = lastPoint;

        //for (int i = 0; i < item.InnerControlPoints.Count; i++)
        //{
        //    ControlPoints[i + 1] = item.InnerControlPoints[i];
        //}
    }
 

But immediatedly after setting the ControlPoints this way and before having a chance to call UpdateFromPoints(false, true) I get an OnSizeChanged() event with some slightly different values in ControlPoints.GetArray().

How can I avoid that the Mindfusion tool changes my values?

Regards,
Pontius

Hi Stoyan,

I found out the reason for this unanticipated behaviour.

When I exit my View (which contains the Diagram) and create it again the old view still exists in the background.
Moreover I never get rid of the old Views and in the end I have a relation between one model and several views with just one view up to date and its Diagram beeing displayed.

Regarding the code in your example http://mindfusion.eu/Forum/YaBB.pl?board=wpfdg_disc;action=display;num=130641288...:

private void OnDataItemsChanged(


INotifyCollectionChanged oldItems,


INotifyCollectionChanged newItems)

{


if (oldItems != null)


{



oldItems.CollectionChanged -= DataItemsCollectionChanged;



ClearAll();


}


if (newItems != null)


{



newItems.CollectionChanged += DataItemsCollectionChanged;



AddItems(DataItems);


}

}
 

I found out that the case (newItems != null) happens everytime I create the View but the other case (oldItems != null) never happens when I close the View. In the end of the day the gac never deletes an old View because there is still a subscription for the eventhandler. My current View containing the real Diagram is disturbed by obsolete instances of old Views that still exist.

Do you have any idea why I only get OnDataItemsChanged with newItems and never OnDataItemsChanged with oldItems?
Or do you have a suggestion for a workaround?
Is it a simple beginner's mistake?

Thanks and regards,
Pontius

Hi Stoyan.

to work around the situation I implemented now:

        private void UserControl_Unloaded(object sender, RoutedEventArgs e)
        {
            INotifyCollectionChanged not = GetValue(DataItemsProperty) as INotifyCollectionChanged;
            not.CollectionChanged -= DataItemsCollectionChanged;
        }
 

So I did by hand what I would have expected to work automatically.

I also removed the ClearAll() function call in

        private void OnDataItemsChanged(INotifyCollectionChanged oldItems, INotifyCollectionChanged newItems)
        {
            if (oldItems != null)
            {
                oldItems.CollectionChanged -= DataItemsCollectionChanged;
//                ClearAll();
            }
            if (newItems != null)
            {
                newItems.CollectionChanged += DataItemsCollectionChanged;
                AddItems(DataItems);
            }
        }
 

because it removes not only the items of my Diagram but also the items in my model which I definetly do not want to be deleted. I wonder how the implementation with a ClearAll() can work without destroying the model data too.

Regards,
Pontuis

Hi Stoyan,

you are right. It can not happen automatically.

Regarding ClearAll() your hint caused me to implement the following which works:

                diagram.LinkDeleted -= new LinkEventHandler(diagram_LinkDeleted);
                diagram.NodeDeleted -= new NodeEventHandler(diagram_NodeDeleted);
                diagram.ClearAll();
 

Thanks and regards,
Pontius