public NodeViewModel CreateNode(NodeViewModel node, bool centerNode)
{
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;
}
/// <summary>
/// Delete the node from the view-model.
/// Also deletes any connections to or from the node.
/// </summary>
public void DeleteNode(NodeViewModel node)
{
//
// Remove all connections attached to the node.
//
this.Network.ExecutionConnections.RemoveRange(node.AttachedExecutionConnections);
//
// Remove all connections attached to the node.
//
this.Network.Connections.RemoveRange(node.AttachedConnections);
//
// Remove the node from the network.
//
this.Network.Nodes.Remove(node);
}
private void CreateNode(NodeViewModel node, /*Point nodeLocation,*/ bool centerNode)
{
//cmMenu.PlacementRectangle.TopLeft
//var nodeLocation = Mouse.GetPosition(networkControl);
//var nodeLocation = networkControl.PointFromScreen(cmMenu.PointToScreen(new Point(0, 0)));
//node.X = nodeLocation.X;
//node.Y = nodeLocation.Y;
this.ViewModel.CreateNode(node, centerNode);
{
var target = NodeCreated;
if (target != null)
{
target(this, new NodeCreatedEventArgs() { Node = node });
}
}
}
