How to make nodes read-only except for selection in Blazor Diagram?

In a Blazor Diagram, preventing nodes in the SfDiagramComponent from being moved can be achieved by disabling all constraints of the node except for the selection constraints. Additionally, to prevent edit operations, enabling the ReadOnly constraints for annotations is necessary. For more detailed information, please refer to the links below:

• Node Constraints
• Annotation Constraints

Code Snippet:

// Create a new node with specific constraints
Node node = new Node()
{
   ID = "node1",
   // Position of the node
   OffsetX = 250,
   OffsetY = 250,
   // Size of the node
   Width = 100,
   Height = 100,
   // Annotations with ReadOnly constraints
   Annotations = new DiagramObjectCollection<ShapeAnnotation>()
   {
       new ShapeAnnotation()
       {
           Constraints = AnnotationConstraints.ReadOnly
       }
   },
   // Node constraints set to allow only selection
   Constraints = NodeConstraints.Default & ~(NodeConstraints.Drag | 
                                             NodeConstraints.Rotate | 
                                             NodeConstraints.Shadow | 
                                             NodeConstraints.Delete | 
                                             NodeConstraints.Inherit | 
                                             NodeConstraints.InConnect | 
                                             NodeConstraints.Resize),
   // Style of the node
   Style = new ShapeStyle() 
   { 
       Fill = "#6495ED", 
       StrokeColor = "white" 
   }
};

You can download the complete working sample from here.

Conclusion:

We hope you enjoyed learning about how to make nodes read-only except for selection in Blazor Diagram.

You can refer to our Blazor Diagram feature tour page to learn about its other groundbreaking feature, documentation, and how to quickly get started with configuration specifications. You can also explore our Blazor Diagram example to understand how to create and manipulate data.

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