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Layers in Blazor Diagram component

Layer is used to organize related shapes on a diagram control. A layer is a named category of shapes. By assigning shapes to different layers, you can selectively view, remove, and lock different categories of shapes.

In diagram, Layers provide a way to change the properties of all shapes that have been assigned to that layer. The following properties can be set.

  • Visible
  • Lock
  • Objects
  • AddInfo

Visible

The layer’s Visible property is used to control the visibility of the elements assigned to the layer.

@using Syncfusion.Blazor.Diagrams
@using System.Collections.ObjectModel

   <SfDiagram Height="600px" Nodes="@NodeCollection" Connectors="@ConnectorCollection" Layers="@Layers">
   </SfDiagram>

@code{
    public ObservableCollection<DiagramNode> NodeCollection = new ObservableCollection<DiagramNode>() { };
    public ObservableCollection<DiagramConnector> ConnectorCollection = new ObservableCollection<DiagramConnector>() { };
    public ObservableCollection<DiagramLayer> Layers = new ObservableCollection<DiagramLayer>() { };
    protected override void OnInitialized()
    {
        // A node is created and stored in nodes array.
        DiagramNode node1 = new DiagramNode()
        {
            Id = "node1",
            OffsetX = 100,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Default Shape"}
            }
        };
        NodeCollection.Add(node1);

        DiagramNode node2 = new DiagramNode()
        {
            Id = "node2",
            OffsetX = 300,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Path Element"}
            },
            Shape = new DiagramShape()
            {
                Type = Syncfusion.Blazor.Diagrams.Shapes.Path,
                Data = "M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643," +
                "179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z"
            }
        };
        NodeCollection.Add(node2);
        DiagramConnector connector1 = new DiagramConnector()
        {
            Id = "connector1",
            SourcePoint = new ConnectorSourcePoint() { X = 100, Y = 300 },
            TargetPoint = new ConnectorTargetPoint() { X = 200, Y = 400 },
            Type = Segments.Straight
        };
        ConnectorCollection.Add(connector1);
        string[] objects = new string[] { "node1" };
        // initialize Layers
        Layers.Add(new DiagramLayer() { Id = "Layer1", Visible = true, Objects = objects });
    }
}

Lock

The layer’s Lock property is used to prevent or allow changes to the elements dimension and position.

@using Syncfusion.Blazor.Diagrams
@using System.Collections.ObjectModel

   <SfDiagram Height="600px" Nodes="@NodeCollection" Connectors="@ConnectorCollection" Layers="@Layers">
   </SfDiagram>

@code{
     public ObservableCollection<DiagramNode> NodeCollection = new ObservableCollection<DiagramNode>() { };
    public ObservableCollection<DiagramConnector> ConnectorCollection = new ObservableCollection<DiagramConnector>() { };
    public ObservableCollection<DiagramLayer> Layers = new ObservableCollection<DiagramLayer>() { };
    protected override void OnInitialized()
    {
        // A node is created and stored in nodes array.
        DiagramNode node1 = new DiagramNode()
        {
            Id = "node1",
            OffsetX = 100,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Default Shape"}
            }
        };
        NodeCollection.Add(node1);

        DiagramNode node2 = new DiagramNode()
        {
            Id = "node2",
            OffsetX = 300,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Path Element"}
            },
            Shape = new DiagramShape()
            {
                Type = Syncfusion.Blazor.Diagrams.Shapes.Path,
                Data = "M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643," +
                "179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z"
            }
        };
        NodeCollection.Add(node2);
        DiagramConnector connector1 = new DiagramConnector()
        {
            Id = "connector1",
            SourcePoint = new ConnectorSourcePoint() { X = 100, Y = 300 },
            TargetPoint = new ConnectorTargetPoint() { X = 200, Y = 400 },
            Type = Segments.Straight
        };
        ConnectorCollection.Add(connector1);
        string[] objects = new string[] { "node1" };
        string[] objects1 = new string[] { "node2" };
        Layers.Add(new DiagramLayer() { Id = "Layer1", Visible = true, Objects = objects, Lock = true });
        Layers.Add(new DiagramLayer() { Id = "layer2", Visible = true, Objects = objects1, Lock = false });

    }
}

Objects

The layer’s Objects property defines the diagram elements to the layer.

@using Syncfusion.Blazor.Diagrams
@using System.Collections.ObjectModel

   <SfDiagram Height="600px" Nodes="@NodeCollection" Connectors="@ConnectorCollection" Layers="@Layers">
   </SfDiagram>

@code{
    public ObservableCollection<DiagramNode> NodeCollection = new ObservableCollection<DiagramNode>() {};
    public ObservableCollection<DiagramConnector> ConnectorCollection = new ObservableCollection<DiagramConnector>() { };
    public ObservableCollection<DiagramLayer> Layers = new ObservableCollection<DiagramLayer>() { };
    protected override void OnInitialized()
    {
        // A node is created and stored in nodes array.
        DiagramNode node1 = new DiagramNode()
        {
            Id = "node1",
            OffsetX = 100,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Default Shape"}
            }
        };
        NodeCollection.Add(node1);

        DiagramNode node2 = new DiagramNode()
        {
            Id = "node2",
            OffsetX = 300,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Path Element"}
            },
            Shape = new DiagramShape()
            {
                Type = Syncfusion.Blazor.Diagrams.Shapes.Path,
                Data = "M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643," +
                "179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z"
            }
        };
        NodeCollection.Add(node2);
        DiagramConnector connector1 = new DiagramConnector()
        {
            Id = "connector1",
            SourcePoint = new ConnectorSourcePoint() { X = 100, Y = 300 },
            TargetPoint = new ConnectorTargetPoint() { X = 200, Y = 400 },
            Type = Segments.Straight
        };
        ConnectorCollection.Add(connector1);
        string[] objects = new string[] { "node1" ,"node2"};
        string[] objects1 = new string[] { "node2" };
        Layers.Add(new DiagramLayer() { Id = "Layer1", Visible = true, Objects = objects });
        Layers.Add(new DiagramLayer() { Id = "layer2", Visible = true, Objects = objects1});

    }
}

AddInfo

The AddInfo property of layers allow you to maintain additional information to the layers.

The following code illustrates how to add additional information to the layers.

@using Syncfusion.Blazor.Diagrams
@using System.Collections.ObjectModel

   <SfDiagram Height="600px" Nodes="@NodeCollection" Connectors="@ConnectorCollection" Layers="@Layers">
   </SfDiagram>

@code{

    public ObservableCollection<DiagramNode> NodeCollection = new ObservableCollection<DiagramNode>() { };
    public ObservableCollection<DiagramConnector> ConnectorCollection = new ObservableCollection<DiagramConnector>() { };
    public ObservableCollection<DiagramLayer> Layers = new ObservableCollection<DiagramLayer>() { };
    public class AdditionalInfo
    {
        public string Description { get; set; }
    };
    protected override void OnInitialized()
    {
        // A node is created and stored in nodes array.
        DiagramNode node1 = new DiagramNode()
        {
            Id = "node1",
            OffsetX = 100,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Default Shape"}
            }
        };
        NodeCollection.Add(node1);

        DiagramNode node2 = new DiagramNode()
        {
            Id = "node2",
            OffsetX = 300,
            OffsetY = 100,
            Width = 100,
            Height = 100,
            Annotations = new ObservableCollection<DiagramNodeAnnotation>()
            {
                new DiagramNodeAnnotation(){ Content = "Path Element"}
            },
            Shape = new DiagramShape()
            {
                Type = Syncfusion.Blazor.Diagrams.Shapes.Path,
                Data = "M540.3643,137.9336L546.7973,159.7016L570.3633,159.7296L550.7723,171.9366L558.9053,194.9966L540.3643," +
                "179.4996L521.8223,194.9966L529.9553,171.9366L510.3633,159.7296L533.9313,159.7016L540.3643,137.9336z"
            }
        };
        NodeCollection.Add(node2);
        DiagramConnector connector1 = new DiagramConnector()
        {
            Id = "connector1",
            SourcePoint = new ConnectorSourcePoint() { X = 100, Y = 300 },
            TargetPoint = new ConnectorTargetPoint() { X = 200, Y = 400 },
            Type = Segments.Straight
        };
        ConnectorCollection.Add(connector1);
        string[] objects = new string[] { "node1" ,"node2"};
        string[] objects1 = new string[] { "node2" };
        Layers.Add(new DiagramLayer() { Id = "Layer1", Visible = true, Objects = objects, AddInfo = new AdditionalInfo() {Description="Layer1" } });
        Layers.Add(new DiagramLayer() { Id = "layer2", Visible = true, Objects = objects1});
    }
}

Add layer at runtime

Layers can be added at runtime by using the AddLayer public method.

The layer’s ID property defines the ID of the layer, and its further used to find the layer at runtime and do any customization.

The following code illustrates how to add a layer.

@using Syncfusion.Blazor.Diagrams
 <input type="button" value="Addlayer" @onclick="@addLayer" />
<SfDiagram Height="600px" @ref="@diagram">
</SfDiagram>

@code{
    SfDiagram diagram;
    DiagramLayer layer = new DiagramLayer()
    {
        Id = "newlayer",
        Visible = true,
        Lock = false,
        Objects = new string[] { },
        ZIndex = -1,
        AddInfo = { }
    };
    List<DiagramConnector> connectors = new List<DiagramConnector>() {
        new DiagramConnector()
        {
            Id = "connector2",
            SourcePoint = new ConnectorSourcePoint() { X = 200, Y = 100 },
            TargetPoint = new ConnectorTargetPoint() { X = 500, Y = 100 },
            Type = Segments.Straight
        }
    };
    // add the layers to the existing diagram layer collection
    public void addLayer()
    {
        diagram.AddLayer(layer, connectors);
    }
}

Remove layer at runtime

Layers can be removed at runtime by using the RemoveLayer public method.

The following code illustrates how to remove a layer.

    SfDiagram diagram;

    // remove the diagram layers
    diagram.RemoveLayer("Layer1");

MoveObjects

Objects of the layers can be moved by using the MoveObjects public method.

The following code illustrates how to move objects from one layer to another layer from the diagram.

  SfDiagram diagram;
  // move the objects of diagram layers
  string[] objects = new string[] { "node2" };
  diagram.MoveObjects(objects,"Layer1");  

BringLayerForward

Layers can be moved forward at runtime by using the BringLayerForward public method.

The following code illustrates how to bring forward to layer.

    SfDiagram diagram;

    // move the layer forward
    diagram.BringLayerForward("Layer1");

SendLayerBackward

Layers can be moved backward at runtime by using the SendLayerBackward public method.

The following code illustrates how to send backward to layer.

    SfDiagram diagram;
    // move the layer backward
    diagram.SendLayerBackward("Layer1");

CloneLayer

Layers can be cloned with its object by using the CloneLayer public method.

The following code illustrates how to bring forward to layer.

    SfDiagram diagram;
    // clone a layer with its objec
    diagram.CloneLayer("Layer1");

GetActiveLayer

To get the active layers back in diagram, use the GetActiveLayer public method.

The following code illustrates how to bring forward to layer.

    SfDiagram diagram;
    // gets the active layer back
    diagram.GetActiveLayer();

SetActiveLayer

Set the active layer by using the SetActiveLayer public method.

The following code illustrates how to bring forward to layer.

    SfDiagram diagram;

    // set the active layer
    //@param layerName defines the name of the layer which is to be active layer
    diagram.SetActiveLayer("Layer1");