protected override void OnMouseMove(MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
if (_isDragging)
{
var currentMousePosition = e.GetPosition(ParentGraphControl);
var offset = currentMousePosition - _lastMousePosition;
_lastMousePosition = currentMousePosition;
RaiseEvent(new ConnectorItemDraggingEventArgs(ConnectorDraggingEvent,
this, offset.X, offset.Y));
}
else
{
var eventArgs = new ConnectorItemDragStartedEventArgs(ConnectorDragStartedEvent, this);
RaiseEvent(eventArgs);
if (eventArgs.Cancel)
{
return;
}
_isDragging = true;
CaptureMouse();
}
e.Handled = true;
}
base.OnMouseMove(e);
}
private void OnConnectorItemDragStarted(object sender, ConnectorItemDragStartedEventArgs e)
{
e.Handled = true;
_draggingSourceConnector = (ConnectorItem)e.OriginalSource;
var eventArgs = new ConnectionDragStartedEventArgs(ConnectionDragStartedEvent, this,
_draggingSourceConnector.ParentElementItem, _draggingSourceConnector);
RaiseEvent(eventArgs);
_draggingConnectionDataContext = eventArgs.Connection;
if (_draggingConnectionDataContext == null)
{
e.Cancel = true;
}
}