Dynamic validation

[Vladimir]

I have created dynamic validation on scheme editing. But I encountered with few problems.
1) How to get active connection correctly? I use method described below:

01.private RadDiagramConnection GetActiveConnection()
02.{
03.    var toolService = ServiceLocator.GetService<IToolService>();
04.    if (toolService == null || toolService.ActiveTool == null) return null;
05.
06.    var toolType = toolService.ActiveTool.GetType();
07.    var fieldInfo = toolType.GetField("activeConnection", BindingFlags.Instance | BindingFlags.NonPublic);
08.    if (fieldInfo == null) return null;
09.    return fieldInfo.GetValue(toolService.ActiveTool) as RadDiagramConnection;
10.}

2) Please, make tool interfaces from Telerik.Windows.Diagrams.Core public.
3) Please, make RadDiagramShapeBase.UpdateVisualStates() non internal.

[Zarko]

Hello Vladimir,
Here I'll try to answer all of your questions:
1) I'd like to ask you why do you need this connection ? As far as I understand you're getting the connection that the ConnectionTool is currently creating is that right ? If you handle the ConnectionManipulationCompleted event you'll get the same connection in its event args and I think that this is the better solution.
2) I'm glad to tell you that as of Q1 2014 the tool interfaces and classes are public.
3) The UpdateVisualStates method is protected internal so you can override it and if you want to change the visual state of a shape you can always do it like this:

VisualStateManager.GoToState(this.diagram.Shapes[0] as FrameworkElement, "SomeState", false);

I hope I was able to help you and if you have more questions feel free to ask.

Regards,
Zarko
Telerik

 

 

[Vladimir]

1) Well i need to change current connector shape color when mouse is over another connection. 
So my alg:
a) OnConnectionManipulationStartedEvent on source connector(here connection is null in args)
b) mouse over another connector
c) OnConnectorActivationChangedEvent handling(activate)
d) Dynamic validation between source and current connectors
e) if connection valid - do nothing otherwise change custom connection dependency property IsValid which across styles will make connection shape red  
Thats why i need reference on current connection before ConnectionManipulationCompletedEvent
2) Nice, thank you
3) I like your code style rules so overriding "standard" method UpdateVisualStates give me more freedom. I want to control current control state and react on your states updates.

[Zarko]

Hi Vladimir,
Thank you for the explanation - it really seems that there's no straightforward way to implement your scenario. The only possible workaround at the moment is to inherit our diagram and override the PublishDiagramEvent:

public class MyDiagram : RadDiagram
{
    public IConnection CurrentConnection { get; set; }
    public bool IsConnectionCreation { get; set; }

    protected override bool PublishDiagramEvent(Windows.Diagrams.Core.DiagramEvent diagramEvent, object args)
    {
        if (diagramEvent == Windows.Diagrams.Core.DiagramEvent.ConnectionAdding && this.IsConnectionCreation)
        {
            var myArgs = args as GenericEventArgs<IConnection>;
            this.CurrentConnection = myArgs.Entity;
        }
        return base.PublishDiagramEvent(diagramEvent, args);
    }
}

and in code behind

private void OnConnectionManipulationStarted(object sender, ManipulationRoutedEventArgs e)
{
    this.diagram.IsConnectionCreation = true;
}

private void OnConnectionManipulationCompleted(object sender, ManipulationRoutedEventArgs e)
{
    this.diagram.IsConnectionCreation = false;
}

We'll consider making the ConnectionTool's activeConnection property public for some of your next releases but at the moment those are your only options.
I hope I was able to help you and if you have more questions feel free to ask. 

Regards,
Zarko
Telerik