private ConnectionLine TryPickingConnectionLineForSplitting()
{
var numConnectedInputs = Inputs.Count(input => input.Connections.Any());
ConnectionLine connectionToHighlight = null;
if (numConnectedInputs == 0)
{
var mousePos = Mouse.GetPosition(CV.XCompositionGraphView.XOperatorCanvas);
var hitResults = UIHelper.HitTestFor <Path>(CV.XCompositionGraphView.XOperatorCanvas, mousePos, 3.0);
foreach (var r in hitResults)
{
foreach (UIElement child in CV.XCompositionGraphView.XOperatorCanvas.Children)
{
var cl = child as ConnectionLine;
if (cl != null && cl.ConnectionPath == r.VisualHit as Path)
{
if (cl.Output.Parent != Operator)
{
connectionToHighlight = cl;
}
}
}
}
}
return(connectionToHighlight);
}
private void XWidgetThumb_DragDeltaHandler(object sender, DragDeltaEventArgs e)
{
e.Handled = true;
var offset = _dragStartPositionOnCanvas - Mouse.GetPosition(_visualParent);
if (_isDraggingNewConnection)
{
return;
}
if (_isDraggingRightEdge)
{
var orginalPositionInsideWidget = _visualParent.TranslatePoint(_dragStartPositionOnCanvas, this);
var currentPositionInsideWidget = _visualParent.TranslatePoint(Mouse.GetPosition(_visualParent), this);
var delta = currentPositionInsideWidget - orginalPositionInsideWidget;
if ((_dragStartWidth + delta.X) > 2 * CompositionGraphView.GRID_SIZE)
{
Width = Math.Round((_dragStartWidth + delta.X) / CompositionGraphView.GRID_SIZE) * CompositionGraphView.GRID_SIZE;
_updateWidthCommand.ChangeEntries[0].Width = Width;
_updateWidthCommand.Do();
GetAndDrawInputZones();
UpdateConnections();
UpdateCornerRadius();
}
}
else
{
_snapHandler.UpdateBeforeMoving(offset);
if (ShakeDetector.TestForShaking(Operator.Position))
{
Logger.Debug("Disconnected with shake gesture.");
DisconnectGroupAfterShakingOff(_snapHandler.DragGroup);
}
// Check for connections that would be dropped on release
ConnectionLine connectionToHighlight = null;
if (Keyboard.Modifiers.HasFlag(ModifierKeys.Control))
{
connectionToHighlight = TryPickingConnectionLineForSplitting();
}
if (_connectionHighlightedForSplitting != null && _connectionHighlightedForSplitting != connectionToHighlight)
{
_connectionHighlightedForSplitting.IsSelected = false;
}
if (connectionToHighlight != null)
{
connectionToHighlight.IsSelected = true;
}
_connectionHighlightedForSplitting = connectionToHighlight;
}
}
private void SplitConnection()
{
var index = _connectionHighlightedForSplitting.GetMultiInputIndex();
var command = new InsertOperatorCommand(_connectionHighlightedForSplitting.Output,
_connectionHighlightedForSplitting.Input,
CV.CompositionGraphView.CompositionOperator, Operator, index);
App.Current.UndoRedoStack.AddAndExecute(command);
App.Current.UpdateRequiredAfterUserInteraction = true;
_connectionHighlightedForSplitting = 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);
}
/// <summary>
/// Start drag a new connection. Called from InputWidget and OperatorWidget when staring to drag from output thumb
/// </summary>
public void Start(Point p, IConnectionLineSource src, int outputIdx)
{
_sourceOutputIndex = -1;
if (outputIdx < 0 || outputIdx >= src.Outputs.Count)
{
return;
}
_sourceOutputIndex = outputIdx;
_sourceWidget = src;
_startPosition = p;
// NOTE: In the long term, this should be capable of handling simultaneously creating multiple connection
_lastPosition = _startPosition;
var cl = new ConnectionLine(_sourceWidget.CV.CompositionGraphView.CompositionOperator, _sourceWidget, _sourceWidget.Outputs[outputIdx]);
_sourceWidget.CV.CompositionGraphView.UnfinishedConnections.Add(cl);
_sourceWidget.CV.CompositionGraphView.XOperatorCanvas.Children.Add(cl);
cl.UpdateDuringConstruction(_lastPosition);
}
public void RewireExistingConnection(ConnectionLine cl, Point startPoint, int outputIdx)
{
_sourceOutputIndex = -1;
if (outputIdx < 0 || outputIdx >= cl.Source.Outputs.Count)
{
return;
}
_sourceWidget = cl.Source;
_sourceOutputIndex = outputIdx;
_startPosition = startPoint;
_lastPosition = _startPosition;
// Delete old connection from model...
cl.Remove();
cl.Target.UpdateConnections();
// ...and restart as unfinished connection line
_sourceWidget.CV.CompositionGraphView.UnfinishedConnections.Add(cl);
_sourceWidget.CV.CompositionGraphView.XOperatorCanvas.Children.Add(cl);
cl.UpdateDuringConstruction(_lastPosition);
cl.IsSelected = true;
}
