/// <summary>
/// Create a node and add it to the view-model.
/// </summary>
public NodeViewModel CreateNode(string name, Point nodeLocation, bool centerNode)
{
var node = new NodeViewModel(name, nodeLocation);
node.AddInputConnector();
node.AddInputConnector();
node.AddOutputConnector();
node.AddOutputConnector();
if (centerNode)
{
//
// We want to center the node.
//
// For this to happen we need to wait until the UI has determined the
// size based on the node's data-template.
//
// So we define an anonymous method to handle the SizeChanged event for a node.
//
// Note: If you don't declare sizeChangedEventHandler before initializing it you will get
// an error when you try and unsubscribe the event from within the event handler.
//
EventHandler <EventArgs> sizeChangedEventHandler = null;
sizeChangedEventHandler =
delegate(object sender, EventArgs e)
{
//
// This event handler will be called after the size of the node has been determined.
// So we can now use the size of the node to modify its position.
//
node.X -= node.Size.Width / 2;
node.Y -= node.Size.Height / 2;
//
// Don't forget to unhook the event, after the initial centering of the node
// we don't need to be notified again of any size changes.
//
node.SizeChanged -= sizeChangedEventHandler;
};
//
// Now we hook the SizeChanged event so the anonymous method is called later
// when the size of the node has actually been determined.
//
node.SizeChanged += sizeChangedEventHandler;
}
//
// Add the node to the view-model.
//
this.Network.Nodes.Add(node);
return(node);
}
public static void AttachInputAndOutputConnectors(NodeViewModel node, int inputCount, int outputCount)
{
for (var i = 0; i < inputCount; i++)
{
node.AddInputConnector();
}
for (var i = 0; i < outputCount; i++)
{
node.AddOutputConnector();
}
}
