Multiselection : at least one node is selected?

GoXam
1

Hello,

I have a button which should be enable only if at least a node is selected.

I’ve binding button’s IsEnabled property on SelectedNode (via converter).

All is ok, even in multiselection if no link are selected.

Some trouble appears when I also select link (for example by drag/drop selection) SelectNode is null.

Binding on SelectedPArts is not possible because it is a collection.

Is there exist a more direct way, than suscribing to SelectedPArts.Collectionchange for maintain a boolean bOneNodeIsSelected. ?

Thanks
Aurore

2

Why not define a converter that looks at Diagram.SelectedParts that returns true if there’s at least one Node in that collection?

3

It was what I’ve tried, but binding fire only one time, because SelectedParts is set one time after it’s only add or remove.

Aurore

4

Ah, that’s right: because the data-binding doesn’t recognize changes to the contents of the collection.

OK, what you suggested sounds good: define a Diagram.SelectionChanged event handler that does what you want. That’s basically the same as defining a CollectionChanged event handler on the collection.

5

ok, I will do.

Aurore