Class DiagramBeforeMenuOpenEventArgs

Triggers before opening the context menu.

Inheritance
System.Object
DiagramBeforeMenuOpenEventArgs
Namespace: Syncfusion.Blazor.Diagrams
Assembly: Syncfusion.Blazor.dll
Syntax
public class DiagramBeforeMenuOpenEventArgs : Object
Examples
<SfDiagram Height="600px" Nodes="@NodeCollection" Constraints="@DiagramConstraints">
   <DiagramEvents OnContextMenuOpen = "Open" ></ DiagramEvents >
   < DiagramContextMenuSettings Show="true" Items="@ContextMenuItemModels" ShowCustomMenuOnly="true">
   </DiagramContextMenuSettings>
</SfDiagram>
@code
{
   //Defines diagram's nodes collection
   public ObservableCollection<DiagramNode> NodeCollection = new ObservableCollection<DiagramNode>();
   public DiagramConstraints DiagramConstraints = DiagramConstraints.Default;
   public void Open(DiagramBeforeMenuOpenEventArgs args)
   {
       args.Cancel = true;
       if ((args != null) && (args.Element != null) && (args.Event != null) && (args.Items != null))
       {
           Console.WriteLine("MenuOpen");
       }
   }
   protected override void OnInitialized()
   {
       //Create a node
       DiagramNode Node = new DiagramNode()
       {
           OffsetX = 100,
           OffsetY = 100,
           Height = 100,
           Width = 100,
           Id = "node1",
           Shape = new DiagramShape() { Type = Syncfusion.Blazor.Diagrams.Shapes.Basic, BasicShape = BasicShapes.Ellipse },
           Style = new NodeShapeStyle()
           {
               Fill = "#6BA5D7",
               StrokeColor = "#6BA5D7",
           },
       };
       //Add node into node's collection
       NodeCollection.Add(Node);
   }
   // Add the custom context menu items
   List<ContextMenuItemModel> ContextMenuItemModels = new List<ContextMenuItemModel>()
   {
       new ContextMenuItemModel()
       {
           Text ="color",
           Id="Save",
           Target =".e-elementcontent1",
           // Add the nested custom context menu items
           Items = new List<ContextMenuItemModel>()
           {
               new ContextMenuItemModel(){  Text ="Red", Id="Red"},
               new ContextMenuItemModel(){  Text ="Yellow", Id="Yellow"},
               new ContextMenuItemModel(){  Text ="Green", Id="Green" }
           }
       },
   };
}

Constructors

DiagramBeforeMenuOpenEventArgs()

Declaration
public DiagramBeforeMenuOpenEventArgs()

Properties

Cancel

Defines whether the user can prevent the context menu opening.

Declaration
public bool Cancel { get; set; }
Property Value
Type Description
System.Boolean

Element

Returns which element has been clicked.

Declaration
public DOM Element { get; set; }
Property Value
Type Description
DOM

Event

Returns event arguments.

Declaration
public EventArgs Event { get; set; }
Property Value
Type Description
System.EventArgs

HiddenItems

Returns the array of hidden context menu items.

Declaration
public List<string> HiddenItems { get; set; }
Property Value
Type Description
System.Collections.Generic.List<System.String>

Items

Return the context menu items.

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

Left

Returns the left position value of the clicked menu item.

Declaration
public double Left { get; set; }
Property Value
Type Description
System.Double

Name

Returns the name of the event.

Declaration
public string Name { get; set; }
Property Value
Type Description
System.String

ParentItem

Returns the parent menu items if the sub-menu opens.

Declaration
public ContextMenuItemModel ParentItem { get; set; }
Property Value
Type Description
ContextMenuItemModel

Top

Returns the top position value of the clicked menu item.

Declaration
public double Top { get; set; }
Property Value
Type Description
System.Double