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Class DiagramCommandManager - Blazor API Reference | Syncfusion

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    Class DiagramCommandManager

    Represents to map or bind command execution with the desired combination of key gestures.

    Inheritance
    System.Object
    Syncfusion.Blazor.SfBaseComponent
    Syncfusion.Blazor.SfBaseExtension
    DiagramCommandManager
    Namespace: Syncfusion.Blazor.Diagrams
    Assembly: Syncfusion.Blazor.dll
    Syntax
    public class DiagramCommandManager : SfBaseExtension
    Remarks
    CommandManager provides support to define custom commands. The custom commands are executed when the specified key gesture is recognized.
    Examples
    <SfDiagram @ref="@Diagram" Height="600px"
       Nodes="@NodeCollection">
       @* Initializing the custom commands*@
       <DiagramCommandManager>
           <DiagramCommands>
               <DiagramCommand Name = "customGroup" >
                   < DiagramKeyGesture Key="Keys.G" KeyModifiers="KeyModifiers.Control"></DiagramKeyGesture>
               </DiagramCommand>
               <DiagramCommand Name = "customUnGroup" >
                   < DiagramKeyGesture Key="Keys.U" KeyModifiers="KeyModifiers.Control"></DiagramKeyGesture>
               </DiagramCommand>
           </DiagramCommands>
       </DiagramCommandManager>
       @* To define the custom commands execution event *@
       <DiagramEvents OnCommandExecuted="@CommandExecute"></DiagramEvents>
    </SfDiagram>
    @code
       {
           // Reference to diagram
           SfDiagram Diagram;
       // Defines diagram's nodes collection
       public ObservableCollection<DiagramNode> NodeCollection { get; set; }
       protected override void OnInitialized()
       {
           //Initializing the nodes collection
           NodeCollection = new ObservableCollection<DiagramNode>();
           DiagramNode DiagramNode1 = new DiagramNode()
           {
               Id = "node1",
               OffsetX = 100,
               OffsetY = 100,
               Width = 100,
               Height = 100,
               Style = new NodeShapeStyle() { Fill = "#659be5", StrokeColor = "none" },
               Annotations = new ObservableCollection<DiagramNodeAnnotation>() { new DiagramNodeAnnotation() { Content = "Node" } }
           };
           NodeCollection.Add(DiagramNode1);
           DiagramNode DiagramNode2 = new DiagramNode()
           {
               Id = "node2",
               OffsetX = 300,
               OffsetY = 100,
               Width = 100,
               Height = 100,
               Style = new NodeShapeStyle() { Fill = "#659be5", StrokeColor = "none" },
               Annotations = new ObservableCollection<DiagramNodeAnnotation>() { new DiagramNodeAnnotation() { Content = "Node" } }
           };
           NodeCollection.Add(DiagramNode2);
       }
       /// <summary>
       /// Custom command execution event
       /// </summary>
       public void CommandExecute(ICommandExecuteEventArgs args)
       {
           if (args.Gesture.KeyModifiers == KeyModifiers.Control && args.Gesture.Key == Keys.G)
           {
               //Custom command to group the selected nodes
               Diagram.Group();
           }
           if (args.Gesture.KeyModifiers == KeyModifiers.Control && args.Gesture.Key == Keys.U)
           {
               //Custom command to ungroup the selected items
               if (Diagram.SelectedItems.Nodes.Count > 0 && Diagram.SelectedItems.Nodes[0].Children != null && Diagram.SelectedItems.Nodes[0].Children.Length > 0)
               {
                   Diagram.UnGroup();
               }
           }
       }
    }

    Constructors

    DiagramCommandManager()

    Declaration
    public DiagramCommandManager()

    Properties

    ChildContent

    Represents a segment of UI content, implemented.

    Declaration
    public RenderFragment ChildContent { get; set; }
    Property Value
    Type Description
    Microsoft.AspNetCore.Components.RenderFragment

    Commands

    Stores the multiple command names with the corresponding command objects

    Declaration
    public List<DiagramCommand> Commands { get; set; }
    Property Value
    Type Description
    System.Collections.Generic.List<DiagramCommand>

    jsProperty

    Declaration
    protected override string jsProperty { get; set; }
    Property Value
    Type Description
    System.String
    Overrides
    Syncfusion.Blazor.SfBaseExtension.jsProperty

    mainParent

    Declaration
    protected override SfBaseExtension mainParent { get; set; }
    Property Value
    Type Description
    Syncfusion.Blazor.SfBaseExtension
    Overrides
    Syncfusion.Blazor.SfBaseExtension.mainParent

    Methods

    BuildRenderTree(RenderTreeBuilder)

    Declaration
    protected override void BuildRenderTree(RenderTreeBuilder __builder)
    Parameters
    Type Name Description
    Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder

    Dispose()

    Declaration
    public override void Dispose()
    Overrides
    Syncfusion.Blazor.SfBaseExtension.Dispose()

    GetJSNamespace()

    Declaration
    public string GetJSNamespace()
    Returns
    Type Description
    System.String

    Get the parent namespaces

    OnInitializedAsync()

    Declaration
    protected override Task OnInitializedAsync()
    Returns
    Type Description
    System.Threading.Tasks.Task

    Returns asynchronous operation when the component is ready to start, having received its initial parameters from its parent in the render tree

    Overrides
    Syncfusion.Blazor.SfBaseComponent.OnInitializedAsync()

    OnParametersSetAsync()

    Declaration
    protected override Task OnParametersSetAsync()
    Returns
    Type Description
    System.Threading.Tasks.Task

    Returns asynchronous operation when the component has received parameters from its parent in the render tree, and the incoming values have been assigned to properties

    updateChildProperties(String, Object)

    Declaration
    public void updateChildProperties(string key, object value)
    Parameters
    Type Name Description
    System.String key
    System.Object value
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