/// <summary>
/// Connects the dragged edge to the in-/output, if valid.
/// </summary>
public void InOutputMouseUp(InOutputViewModel inOut)
{
if (DraggedEdge == null)
{
return;
}
DraggedEdge.EndViewModel = inOut;
InOutputViewModel inputVM, outputVM;
if (DraggedEdge.GetInOut(out inputVM, out outputVM))
{
var output = (Node.Output)outputVM.Model;
if (Parent.Model.Graph.CanAddEdge(output.Node, inputVM.Parent.Model))
{
if (inputVM.IsFake)
{
inputVM.Parent.AddInput(output);
}
else
{
((Node.Input)inputVM.Model).Source = output;
}
CullInputs();
NotifyOfPropertyChange(() => Edges);
Parent.SaveSnapshot();
}
}
DraggedEdge = null;
}
/// <summary>
/// Starts dragging the connected edge, if any, or a new one.
/// </summary>
public void InOutputMouseDown(InOutputViewModel inOut)
{
/* Only allow this if pipeline is not rendering */
if (!Parent.Model.IsPlaying)
{
InOutputViewModel start = inOut;
// If the input is already connected, drag the existing edge
if (inOut.Model is Node.Input)
{
start = GetOutputViewModel(((Node.Input)inOut.Model).Source) ?? start;
((Node.Input)inOut.Model).Source = null;
NotifyOfPropertyChange(() => Edges);
// remember the end of the grabbed edge
draggedEdgeEndNodeVM = inOut.Parent;
}
DraggedEdge = new EdgeViewModel {
StartViewModel = start, EndViewModel = inOut
};
}
}
/// <summary>
/// Updates the position of the dragged edge or node.
/// </summary>
public void MouseMove(IMouseEventInfo e)
{
if (e.LeftButton != MouseButtonState.Pressed)
{
draggedNode = null;
DraggedEdge = null;
// removes unnecessary inputs
CullInputs();
return;
}
if (draggedNode != null)
{
draggedNode.Position = e.GetPosition(relativeTo: this) - dragMouseOffset;
}
else if (DraggedEdge != null)
{
if (DraggedEdge.Status != EdgeStatus.Indeterminate)
{
DraggedEdge.Status = EdgeStatus.Indeterminate;
}
DraggedEdge.EndPoint = e.GetPosition(relativeTo: this);
}
}
/// <summary>
/// Cancels any drag operations.
/// </summary>
public void MouseUp()
{
CullInputs();
draggedNode = null;
DraggedEdge = null;
}