private void XOperatorWidgetThumb_Drop(object sender, DragEventArgs e)
{
var mousePosition = e.GetPosition(this);
var inputZonesForDrag = OperatorWidgetInputZoneManager.ComputeInputZonesForOp(this);
var zoneBelowMouse = OperatorWidgetInputZoneManager.FindZoneBelowMouse(inputZonesForDrag, mousePosition);
if (zoneBelowMouse != null)
{
CV.CompositionGraphView.ConnectionDragHelper.Stop(new Vector(0, 0), zoneBelowMouse);
}
e.Handled = true;
}
/**
* This function is called by IConnectionTargets when
* the end of a connection is dragged over them.
*
* To "snap" valid connections, we save the zone so the
* GiveFeedbackHandler can use its position.
*/
public void HandleDragOverEvent(DragEventArgs e, IConnectionLineTarget targetWidget)
{
e.Effects = DragDropEffects.None;
e.Handled = true;
var connectionStartOutput = e.Data.GetData(CONNECTION_LINE_OUTPUT_IDENTIFIER) as OperatorPart;
if (connectionStartOutput == null)
{
return; // Skip non-connection drop data
}
// We can't use Mouse.GetPosition() also see
// http://msdn.microsoft.com/en-us/library/system.windows.input.mouse.getposition(v=vs.110).aspx
var mousePosition = e.GetPosition(targetWidget as UIElement);
var inputZonesForDrag = OperatorWidgetInputZoneManager.ComputeInputZonesForOp(targetWidget);
var zoneBelowMouse = OperatorWidgetInputZoneManager.FindZoneBelowMouse(inputZonesForDrag, mousePosition);
if (zoneBelowMouse != null)
{
zoneBelowMouse.IsBelowMouse = true;
_snappedToValidInput = zoneBelowMouse.Input.Type == connectionStartOutput.Type ||
zoneBelowMouse.Input.Type == FunctionType.Generic;
if (_snappedToValidInput)
{
e.Effects = DragDropEffects.Copy;
_snappedPointOnCanvas = targetWidget.PositionOnCanvas + new Vector(zoneBelowMouse.LeftPosition + 0.5 * zoneBelowMouse.Width, targetWidget.Height);
}
}
if (mousePosition == _lastDragOverPosition)
{
return;
}
_lastDragOverPosition = mousePosition;
targetWidget.UpdateInputZonesUIFromDescription(inputZonesForDrag);
}