public CanvasPoint BeginLinkage(PinViewModel pinViewModel)
{
_currentUnfinishedLink = new LinkViewModel(pinViewModel, null, ControlTypesResolver);
_linkViewModels.Add(_currentUnfinishedLink);
return(_currentUnfinishedLink.EndPoint);
}
public CanvasPoint BeginLinkage(PinViewModel pinViewModel)
{
_currentUnfinishedLink = new LinkViewModel(pinViewModel, null, ControlTypesResolver);
_linkViewModels.Add(_currentUnfinishedLink);
return _currentUnfinishedLink.EndPoint;
}
public CanvasPoint BeginRelinkage(PinViewModel pinViewModel)
{
_currentUnfinishedLink = _linkViewModels.First(model => model.TargetPinViewModel == pinViewModel);
_currentUnfinishedLink.TargetPinViewModel = null;
var canvasPoint = new CanvasPoint();
_currentUnfinishedLink.EndPoint = canvasPoint;
return(canvasPoint);
}
public void EndLinkage(PinViewModel pinViewModel)
{
if (_currentUnfinishedLink != null)
{
var success = false;
if (_currentUnfinishedLink.TargetPinViewModel == null)
{
// Can't link to nowhere
if (pinViewModel != null)
{
// Can't link input<->input
if (pinViewModel.Pin.Direction == PinDirection.Input)
{
// Can't link node to itself
if (pinViewModel.NodeViewModel != _currentUnfinishedLink.SourcePinViewModel.NodeViewModel)
{
// Hurray! Successfully linked!
// Cleanup previous loosers
foreach (var linkViewModel in _linkViewModels.Where(model => model.TargetPinViewModel == pinViewModel).ToArray())
{
Node.Unlink(linkViewModel.TargetPinViewModel.NodeViewModel.Node, linkViewModel.TargetPinViewModel.Pin);
_linkViewModels.Remove(linkViewModel);
}
_currentUnfinishedLink.TargetPinViewModel = pinViewModel;
Node.Link(
_currentUnfinishedLink.SourcePinViewModel.NodeViewModel.Node,
_currentUnfinishedLink.SourcePinViewModel.Pin,
pinViewModel.NodeViewModel.Node,
pinViewModel.Pin);
pinViewModel.NodeViewModel.Node.Pulse();
success = true;
}
}
}
}
if (!success)
{
_linkViewModels.Remove(_currentUnfinishedLink);
}
_currentUnfinishedLink = null;
}
}
public LinkViewModel(PinViewModel sourcePinViewModel, PinViewModel targetPinViewModel, IControlTypesResolver controlTypesResolver)
{
SourcePinViewModel = sourcePinViewModel;
TargetPinViewModel = targetPinViewModel;
ControlTypesResolver = controlTypesResolver;
}
private void OnPreviewPinMouseUp(PinViewModel pinViewModel, MouseButtonEventArgs e)
{
ViewModel.EndLinkage(pinViewModel);
}
private void OnPreviewPinMouseDown(PinViewModel pinViewModel, MouseButtonEventArgs e)
{
if (pinViewModel.Pin.Direction != PinDirection.Input)
{
_endLinkPoint = ViewModel.BeginLinkage(pinViewModel);
CaptureMouse();
}
else
{
_endLinkPoint = ViewModel.BeginRelinkage(pinViewModel);
CaptureMouse();
}
}
public LinkViewModel(PinViewModel sourcePinViewModel, PinViewModel targetPinViewModel, IControlTypesResolver controlTypesResolver)
{
SourcePinViewModel = sourcePinViewModel;
TargetPinViewModel = targetPinViewModel;
ControlTypesResolver = controlTypesResolver;
}
public CanvasPoint BeginRelinkage(PinViewModel pinViewModel)
{
_currentUnfinishedLink = _linkViewModels.First(model => model.TargetPinViewModel == pinViewModel);
_currentUnfinishedLink.TargetPinViewModel = null;
var canvasPoint = new CanvasPoint();
_currentUnfinishedLink.EndPoint = canvasPoint;
return canvasPoint;
}
public void EndLinkage(PinViewModel pinViewModel)
{
if (_currentUnfinishedLink != null)
{
var success = false;
if (_currentUnfinishedLink.TargetPinViewModel == null)
{
// Can't link to nowhere
if (pinViewModel != null)
{
// Can't link input<->input
if (pinViewModel.Pin.Direction == PinDirection.Input)
{
// Can't link node to itself
if (pinViewModel.NodeViewModel != _currentUnfinishedLink.SourcePinViewModel.NodeViewModel)
{
// Hurray! Successfully linked!
// Cleanup previous loosers
foreach (var linkViewModel in _linkViewModels.Where(model => model.TargetPinViewModel == pinViewModel).ToArray())
{
Node.Unlink(linkViewModel.TargetPinViewModel.NodeViewModel.Node, linkViewModel.TargetPinViewModel.Pin);
_linkViewModels.Remove(linkViewModel);
}
_currentUnfinishedLink.TargetPinViewModel = pinViewModel;
Node.Link(
_currentUnfinishedLink.SourcePinViewModel.NodeViewModel.Node,
_currentUnfinishedLink.SourcePinViewModel.Pin,
pinViewModel.NodeViewModel.Node,
pinViewModel.Pin);
pinViewModel.NodeViewModel.Node.Pulse();
success = true;
}
}
}
}
if (!success)
{
_linkViewModels.Remove(_currentUnfinishedLink);
}
_currentUnfinishedLink = null;
}
}