/// <summary>
/// Called to query the application for feedback while the user is dragging the connection.
/// </summary>
public void QueryConnnectionFeedback(ConnectorViewModel draggedOutConnector, ConnectorViewModel draggedOverConnector, out object feedbackIndicator, out bool connectionOk)
{
if (draggedOutConnector == draggedOverConnector)
{
//
// Can't connect to self!
// Provide feedback to indicate that this connection is not valid!
//
feedbackIndicator = new ConnectionBadIndicator();
connectionOk = false;
}
else
{
var sourceConnector = draggedOutConnector;
var destConnector = draggedOverConnector;
//
// Only allow connections from output connector to input connector (ie each
// connector must have a different type).
// Also only allocation from one node to another, never one node back to the same node.
//
connectionOk = sourceConnector.ParentNode != destConnector.ParentNode &&
sourceConnector.Type != destConnector.Type &&
sourceConnector.DataType == destConnector.DataType;
if (connectionOk)
{
//
// Yay, this is a valid connection!
// Provide feedback to indicate that this connection is ok!
//
feedbackIndicator = new ConnectionOkIndicator();
}
else
{
//
// Connectors with the same connector type (eg input & input, or output & output)
// can't be connected.
// Only connectors with separate connector type (eg input & output).
// Provide feedback to indicate that this connection is not valid!
//
feedbackIndicator = new ConnectionBadIndicator();
}
}
}
/// <summary>
/// Called to query the application for feedback while the user is dragging the connection.
/// </summary>
public void QueryConnnectionFeedback(ConnectorViewModel draggedOutConnector, ConnectorViewModel draggedOverConnector, out object feedbackIndicator, out bool connectionOk)
{
if (draggedOutConnector == draggedOverConnector)
{
//
// Can't connect to self!
// Provide feedback to indicate that this connection is not valid!
//
feedbackIndicator = new ConnectionBadIndicator("Can't connect to self");
connectionOk = false;
}
else
{
string message = string.Empty;
var sourceConnector = draggedOutConnector;
var destConnector = draggedOverConnector;
//
// Only allow connections from output connector to input connector (ie each
// connector must have a different type).
// Also only allocation from one node to another, never one node back to the same node.
//
connectionOk = IsValidConnection(sourceConnector, draggedOverConnector, ref message);
if (connectionOk)
{
feedbackIndicator = new ConnectionOkIndicator();
}
else
{
//
// Connectors with the same connector type (eg input & input, or output & output)
// can't be connected.
// Only connectors with separate connector type (eg input & output).
// Provide feedback to indicate that this connection is not valid!
//
feedbackIndicator = new ConnectionBadIndicator(message);
}
}
}
/// <summary>
/// Called to query the application for feedback while the user is dragging the connection.
/// </summary>
public void QueryConnnectionFeedback(ConnectorViewModel draggedOutConnector, ConnectorViewModel draggedOverConnector, out object feedbackIndicator, out bool connectionOk)
{
if (draggedOutConnector == draggedOverConnector)
{
//
// Can't connect to self!
// Provide feedback to indicate that this connection is not valid!
//
feedbackIndicator = new ConnectionBadIndicator();
connectionOk = false;
}
else
{
var sourceConnector = draggedOutConnector;
var destConnector = draggedOverConnector;
//
// Only allow connections from output connector to input connector (ie each
// connector must have a different type).
// Also only allocation from one node to another, never one node back to the same node.
//
connectionOk = sourceConnector.ParentNode != destConnector.ParentNode &&
sourceConnector.Type != destConnector.Type &&
destConnector.AttachedConnections.Count == 0;
if (connectionOk)
{
//
// Yay, this is a valid connection!
// Provide feedback to indicate that this connection is ok!
//
feedbackIndicator = new ConnectionOkIndicator();
}
else
{
//
// Connectors with the same connector type (eg input & input, or output & output)
// can't be connected.
// Only connectors with separate connector type (eg input & output).
// Provide feedback to indicate that this connection is not valid!
//
feedbackIndicator = new ConnectionBadIndicator();
}
}
}
