/// <summary>
/// Event raised when the user has started to drag out a connection.
/// </summary>
private void networkControl_ConnectionDragStarted(object sender, ConnectionDragStartedEventArgs e)
{
var draggedOutConnector = (ConnectorViewModel)e.ConnectorDraggedOut;
var curDragPoint = Mouse.GetPosition(networkControl);
//
// Delegate the real work to the view model.
//
var connection = this.ViewModel.ConnectionDragStarted(draggedOutConnector, curDragPoint);
//
// Must return the view-model object that represents the connection via the event args.
// This is so that NetworkView can keep track of the object while it is being dragged.
//
e.Connection = connection;
}
/// <summary>
/// Event raised when the user starts to drag a connector.
/// </summary>
private void ConnectorItem_DragStarted(object source, ConnectorItemDragStartedEventArgs e)
{
this.Focus();
e.Handled = true;
this.IsDragging = true;
this.IsNotDragging = false;
this.IsDraggingConnection = true;
this.IsNotDraggingConnection = false;
this.draggedOutConnectorItem = (ConnectorItem)e.OriginalSource;
var nodeItem = this.draggedOutConnectorItem.ParentNodeItem;
this.draggedOutNodeDataContext = nodeItem.DataContext != null ? nodeItem.DataContext : nodeItem;
this.draggedOutConnectorDataContext = this.draggedOutConnectorItem.DataContext != null ? this.draggedOutConnectorItem.DataContext : this.draggedOutConnectorItem;
//
// Raise an event so that application code can create a connection and
// add it to the view-model.
//
ConnectionDragStartedEventArgs eventArgs = new ConnectionDragStartedEventArgs(ConnectionDragStartedEvent, this, this.draggedOutNodeDataContext, this.draggedOutConnectorDataContext);
RaiseEvent(eventArgs);
//
// Retrieve the the view-model object for the connection was created by application code.
//
this.draggingConnectionDataContext = eventArgs.Connection;
if (draggingConnectionDataContext == null)
{
//
// Application code didn't create any connection.
//
e.Cancel = true;
return;
}
}