/// <summary>
/// Event raised when the user has started to drag out a connection.
/// </summary>
private void networkControl_ExecutionConnectionDragStarted(object sender, ExecutionConnectionDragStartedEventArgs e)
{
var draggedOutConnector = (ExecutionConnectorViewModel)e.ExecutionConnectorDraggedOut;
var curDragPoint = Mouse.GetPosition(networkControl);
//
// Delegate the real work to the view model.
//
var connection = this.ViewModel.ExecutionConnectionDragStarted(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.ExecutionConnection = connection;
}
/// <summary>
/// Event raised when the user starts to drag a connector.
/// </summary>
private void ExecutionConnectorItem_DragStarted(object source, ExecutionConnectorItemDragStartedEventArgs e)
{
this.Focus();
e.Handled = true;
this.IsDragging = true;
this.IsNotDragging = false;
this.IsDraggingExecutionConnection = true;
this.IsNotDraggingExecutionConnection = false;
this.draggedOutExecutionConnectorItem = (ExecutionConnectorItem)e.OriginalSource;
var nodeItem = this.draggedOutExecutionConnectorItem.ParentNodeItem;
this.draggedOutNodeDataContext = nodeItem.DataContext != null ? nodeItem.DataContext : nodeItem;
this.draggedOutExecutionConnectorDataContext = this.draggedOutExecutionConnectorItem.DataContext != null ? this.draggedOutExecutionConnectorItem.DataContext : this.draggedOutExecutionConnectorItem;
//
// Raise an event so that application code can create a connection and
// add it to the view-model.
//
ExecutionConnectionDragStartedEventArgs eventArgs = new ExecutionConnectionDragStartedEventArgs(ExecutionConnectionDragStartedEvent, this, this.draggedOutNodeDataContext, this.draggedOutExecutionConnectorDataContext);
RaiseEvent(eventArgs);
//
// Retrieve the the view-model object for the connection was created by application code.
//
this.draggingExecutionConnectionDataContext = eventArgs.ExecutionConnection;
if (draggingExecutionConnectionDataContext == null)
{
//
// Application code didn't create any connection.
//
e.Cancel = true;
return;
}
}