/// <summary>
/// Begins dragging the clicked node and pushes it in front of other nodes.
/// </summary>
public void NodeMouseDown(NodeViewModel node, IMouseEventInfo e)
{
draggedNode = node;
dragMouseOffset = e.GetPosition(relativeTo: this) - draggedNode.Position;
draggedNode.ZIndex = maxZValue++;
draggedNode.NotifyOfPropertyChange(() => draggedNode.ZIndex);
}
/// <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);
}
}