/// <summary>
/// When linking nodes, adds source connector to the diagram's view model for information access.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MyDiagram_ConnectionManipulationStarted(object sender, ManipulationRoutedEventArgs e)
{
if (e.ManipulationStatus == ManipulationStatus.Attaching)
{
var connector = e.Connector as BaseConnector;
if (connector != null && connector.DataContext is ConnectorViewModel)
{
var viewModel = connector.DataContext as ConnectorViewModel;
if (viewModel.CanConnect())
{
sourceConnector = connector;
diagramViewModel.SourceConnector = viewModel;
return;
}
else
{
viewModel.IsConnected = false;
}
}
}
sourceConnector = null;
diagramViewModel.SourceConnector = null;
diagramViewModel.TargetConnector = null;
e.Handled = true;
}
/// <summary>
/// Creates connector text based on connectors
/// </summary>
/// <param name="connector">Connector instance</param>
public void LoadConnectorText(BaseConnector connector)
{
const int leftOffset = 8;
const double topOffset = 8.5d;
const double leftOffsetFlow = 9.5d;
const double topOffsetFlow = 5.5d;
var canvas = WPFVisualTreeHelper.FindChild <Canvas>(this);
var connectors = WPFVisualTreeHelper.FindChildren <RadDiagramConnector>(this);
foreach (var item in connectors.OfType <BaseConnector>())
{
if (item != connector)
{
continue;
}
var text = new TextBlock {
Text = item.Text, Foreground = Brushes.White
};
canvas.Children.Add(text);
var connectorLocation = item.TranslatePoint(new Point(0, 0), this);
if (item.ConnectorDirection == ConnectorDirection.In)
{
if (item is FlowConnector)
{
text.SetLocation(connectorLocation.X + leftOffsetFlow, connectorLocation.Y - topOffsetFlow);
}
else
{
text.SetLocation(connectorLocation.X + leftOffset, connectorLocation.Y - topOffset);
}
}
else
{
if (item is FlowConnector)
{
outPinTexts[text] = new Point(connectorLocation.X, connectorLocation.Y - topOffsetFlow);
}
else
{
outPinTexts[text] = new Point(connectorLocation.X, connectorLocation.Y - topOffset);
}
text.Loaded += Text_Loaded;
}
}
}
/// <summary>
/// When linking nodes, updates source's and target's data contexts.
/// If linking is possible, updates target connector of diagram view model with target's view model.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MyDiagram_ConnectionManipulationCompleted(object sender, ManipulationRoutedEventArgs e)
{
if (sourceConnector != null && e.Connector != null && e.Connector != sourceConnector &&
e.ManipulationStatus == ManipulationStatus.Attaching)
{
var sourceConnectorViewModel = sourceConnector.DataContext as ConnectorViewModel;
var targetConnector = e.Connector as BaseConnector;
var targetConnectorViewModel = targetConnector.DataContext as ConnectorViewModel;
if (targetConnectorViewModel.CanConnectTo(sourceConnectorViewModel))
{
diagramViewModel.TargetConnector = targetConnectorViewModel;
return;
}
}
(sourceConnector.DataContext as ConnectorViewModel).IsConnected = false;
sourceConnector = null;
diagramViewModel.SourceConnector = null;
diagramViewModel.TargetConnector = null;
e.Handled = true;
}