public NodifyEditorViewModel()
{
DeleteSelectionCommand = new DelegateCommand(DeleteSelection, () => SelectedNodes.Count > 0);
CommentSelectionCommand = new DelegateCommand(() => Schema.AddCommentAroundNodes(SelectedNodes, "New comment"), () => SelectedNodes.Count > 0);
DisconnectConnectorCommand = new DelegateCommand <ConnectorViewModel>(c => c.Disconnect());
CreateConnectionCommand = new DelegateCommand <object>(target => Schema.TryAddConnection(PendingConnection.Source !, target), target => PendingConnection.Source != null && target != null);
PendingConnection = new PendingConnectionViewModel
{
Graph = this
};
Schema = new GraphSchema();
Connections.WhenAdded(c =>
{
c.Graph = this;
c.Input.Connections.Add(c);
c.Output.Connections.Add(c);
})
// Called when the collection is cleared
.WhenRemoved(c =>
{
c.Input.Connections.Remove(c);
c.Output.Connections.Remove(c);
});
Nodes.WhenAdded(x => x.Graph = this)
// Not called when the collection is cleared
.WhenRemoved(x =>
{
if (x is FlowNodeViewModel flow)
{
flow.Disconnect();
}
else if (x is KnotNodeViewModel knot)
{
knot.Connector.Disconnect();
}
})
.WhenCleared(x => Connections.Clear());
}