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How to Fire Event on SFDiagram Node Selection

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127392 Nov 11,2016 11:19 PM UTC Nov 14,2016 12:38 PM UTC WPF 2
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Tags: SfDiagram
John Rewolinski
Asked On November 11, 2016 11:19 PM UTC

Hi,

So I'm bashing my head against a wall trying to figure out what should be simple.  However the documentation doesn't really give a good answer.

I have an SFDiagram filled with nodes.  I am using MVVM design.

I want to be able to click one of the nodes, and have it do something.

I tried to add an event handler for clicking on the SFDiagram, but it doesn't seem to work:



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using Syncfusion;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Syncfusion.UI.Xaml.Diagram.Layout;
using Syncfusion.UI.Xaml.Diagram;
using System.Collections.ObjectModel;
using Link_Map.Classes;
using Syncfusion.SfSkinManager;
using Syncfusion.Windows.Shared;
using Syncfusion.Windows.Tools.Controls;
using Syncfusion.UI.Xaml.Diagram.Controls;

namespace Link_Map
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : ChromelessWindow
    {
        Controller controller = new Controller();
        DirectedTreeLayout tree = new DirectedTreeLayout();

        public MainWindow()
        {
            InitializeComponent();
            InitDiagram();
            controller.AddRoot();
            Link_Grid.ItemsSource = controller.viewmodel.Links;
        }

        private void InitDiagram()
        {
            controller.Init();
            lmWindow.Nodes = new ObservableCollection<Node>();
            lmWindow.Connectors = new ObservableCollection<Connector>();
            DataSourceSettings settings = new DataSourceSettings();
            settings.DataSource = controller.viewmodel.Links;
            settings.ParentId = "ParentID";
            settings.Id = "LinkID";
            settings.Root = "0";
            lmWindow.DataSourceSettings = settings;
            settings.DataSource = controller.viewmodel.Links;
            (lmWindow.Info as IGraphInfo).ItemAdded += MainWindow_ItemAdded;

            

            lmWindow.LayoutManager = new LayoutManager()
            {
                Layout = new RadialTreeLayout()
            };

            (lmWindow.LayoutManager.Layout as RadialTreeLayout).HorizontalSpacing = 10;
            (lmWindow.LayoutManager.Layout as RadialTreeLayout).VerticalSpacing = 35;

            lmWindow.Menu = null;
            lmWindow.Tool = Tool.ZoomPan;

            lmWindow.DefaultConnectorType = ConnectorType.Line;
            lmWindow.PageSettings.PageBorderBrush = new SolidColorBrush(Colors.Transparent);
            /*
                         Diagrammy.Constraints = Diagrammy.Constraints &
                                         ~(GraphConstraints.Draggable | GraphConstraints.Selectable);
            */

    }

        private void Metro_Theme_Click(object sender, RoutedEventArgs e)
        {
            SkinStorage.SetVisualStyle(this, "Metro");
        }

        private void Blend_Theme_Click(object sender, RoutedEventArgs e)
        {
            SkinStorage.SetVisualStyle(this, "Blend");
        }

        private void Add_Click(object sender, RoutedEventArgs e)
        {
            for(int i=0; i<100; i++)
            {
                controller.AddLink();
            }
            lmWindow.LayoutManager.Layout.UpdateLayout();
        }


        //Apply Node and Connector Style
        private void MainWindow_ItemAdded(object sender, ItemAddedEventArgs args)
        {
            if (args.Item is INode)
            {
                (args.Item as INode).UnitWidth = 10;
                (args.Item as INode).UnitHeight = 10;
                (args.Item as INode).ContentTemplate = this.lmWindow.Resources["contentTemplate"] as DataTemplate;
            }
            else if (args.Item is IConnector)
            {
                SolidColorBrush solid = new SolidColorBrush();
                solid.Color = Color.FromArgb(255, 186, 186, 186);
                (args.Item as IConnector).TargetDecoratorStyle = this.Resources["style"] as Style;
            }
        }      
    }
}


John Rewolinski
Replied On November 12, 2016 03:51 AM UTC

Also, if I could figure out which node I selected?  And what the collections index of the node is?

Keerthivasan Ramamoorthy [Syncfusion]
Replied On November 14, 2016 12:38 PM UTC

 Hi John, 
 
Thank you for contacting Syncfusion Support. 
 
Please find the responses to your queries as below. 
S.no 
Query 
Response 
1 
I want to be able to click one of the nodes, and have it do something. 
 
Requirement:” Need to fire an Event When the Node is Selected”. 
 
We have ItemSelectedEvent support for Diagram which will fire when an item (Node and Connector) is Selected. We have provided a code Example to represent this. Please refer to the code example as below.  
 
Code Example: 
//ItemSelectedEvent 
(diagram.Info as IGraphInfo).ItemSelectedEvent += MainWindow_ItemSelectedEvent; 
private void MainWindow_ItemSelectedEvent(object sender, DiagramEventArgs args) 
{ 
   if (args.Item != null && args.Item is INode) 
     { 
       INode node = args.Item as INode; 
       //node.IsSelected 
       //node.ZIndex; 
 
      } 
} 
 
Here, diagram is instance of SfDiagram. 
 
 
 
2 
Also, if I could figure out which node I selected?   
We have IsSelected Property for Node/Connector which is used to know the Selected item from the Diagram (Nodes and Connector). Please refer the above code example. 
3 
And what the collections index of the node is? 
We have ZIndex Property for Node/Connector which is used to know the Index. Please refer the above code example. 
 
 
Regards, 
Keerthivasan R. 
  


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