protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
// Draw lines between connectors
if (ViewModel?.Nodes != null)
{
foreach (var node in ViewModel.Nodes)
{
foreach (var prop in node.LinkableProperties)
{
// Check if the property has a reference to an expression, if so, find the connector points
if (prop.Value is INodeReference nr && nr.Id.HasValue)
{
var start = DependencyObjectUtils.ChildOfType <VisualNodeConnector>(this, c => c.NodeID == node.ID && c.PropertyName == prop.Name && c.ConnectorFlow == ConnectorFlow.Destination);
var end = DependencyObjectUtils.ChildOfType <VisualNodeConnector>(this, c => c.NodeID == nr.Id.Value && c.ConnectorFlow == ConnectorFlow.Source);
var isStatement = prop.PropertyType == VisualNodePropertyType.Statement;
if (start != null && end != null)
{
drawingContext.DrawConnectorLine(
new Pen(new SolidColorBrush(isStatement ? Colors.Gray : this.ColorForDataType(prop.Type)), 2d),
start.TransformToAncestor(this).Transform(start.MidPoint),
end.TransformToAncestor(this).Transform(end.MidPoint),
isStatement
);
}
}
}
}
}
// If there is a drag going on, run the behaviours custom render method
ViewModel?.DragBehaviour?.OnRender(this, drawingContext);
}
public void OnRender(VisualNodeCanvas canvas, DrawingContext drawingContext)
{
drawingContext.DrawConnectorLine(
linePen,
Connector.TransformToAncestor(canvas).Transform(Connector.MidPoint),
lastPoint,
isStatement
);
}
