private void GiveFeedbackHandler(object sender, GiveFeedbackEventArgs e)
{
var element = sender as IInputElement;
if (element == null)
{
return;
}
var endPositionForConnection = e.Effects == DragDropEffects.Copy && _snappedToValidInput
? _snappedPointOnCanvas
: Win32RawInput.MousePointInUiElement(_cgv.XOperatorCanvas);
UpdateConnectionUI(endPositionForConnection);
_snappedToValidInput = false; // Sadly this can lead to jittering because the feedback-handler is called more frequently then the DragOver event
}
public void DoDragDropNewConnection(IConnectionLineSource sourceWidget, OperatorPart output)
{
_dragStartPositionOnCanvas = Win32RawInput.MousePointInUiElement(_cgv.XOperatorCanvas);
_snappedToValidInput = false;
var dragData = new DataObject(CONNECTION_LINE_OUTPUT_IDENTIFIER, output);
// We have to restart the temp connection, because DoDragDrop triggers DragCompleted
Start(_dragStartPositionOnCanvas, sourceWidget, output.Func.EvaluationIndex);
DragDrop.AddGiveFeedbackHandler(_cgv, GiveFeedbackHandler);
DragDrop.DoDragDrop(_cgv, dragData, DragDropEffects.All);
// Importat! This line is not reached until drop is completed.
DragDrop.RemoveGiveFeedbackHandler(_cgv, GiveFeedbackHandler);
Stop(new Vector(), null);
}
public void DoDragDropRewireConnection(ConnectionLine cl)
{
_dragStartPositionOnCanvas = Win32RawInput.MousePointInUiElement(_cgv.XOperatorCanvas);
_snappedToValidInput = false;
var dragData = new DataObject(CONNECTION_LINE_OUTPUT_IDENTIFIER, cl.Output);
// We have to restart the temp connection, because DoDragDrop triggers DragCompleted
cl.HitTestDisabledDuringDrag = false;
RewireExistingConnection(cl, _dragStartPositionOnCanvas, cl.Output.Func.EvaluationIndex);
DragDrop.AddGiveFeedbackHandler(_cgv, GiveFeedbackHandler);
DragDrop.DoDragDrop(_cgv, dragData, DragDropEffects.All);
// Important! This line is not reached until drop is completed.
DragDrop.RemoveGiveFeedbackHandler(_cgv, GiveFeedbackHandler);
Stop(new Vector(), null);
}