Develop an alarm grid NetLogic

Create a NetLogic that populates the alarm grid.

Tip: You can use a preconfigured alarm grid instead of creating it from scratch. For more information, select Template Libraries and select Widgets > Alarm Grid.

Prerequisites

Set the default external code editor. See Set the default code editor.

  1. In the Project view pane, right-click AlarmGridPane and select New > Runtime NetLogic.
  2. Hover-over the NetLogic, select Edit, and enter AlarmsGridNetLogic
  3. Double-click the NetLogic.
    The external code editor opens.
  4. Replace the existing code with the following code: 
    #region StandardUsing
using System;
using FTOptix.Core;
using FTOptix.CoreBase;
using FTOptix.HMIProject;
using UAManagedCore;
using OpcUa = UAManagedCore.OpcUa;
using FTOptix.NetLogic;
using FTOptix.OPCUAServer;
using FTOptix.UI;
using FTOptix.Alarm;
#endregion

public class AlarmsGridNetLogic : FTOptix.NetLogic.BaseNetLogic
{
    public override void Start()
    {
        alarmsDatagrid = Owner.Children.Get<DataGrid>("AlarmsGrid");
        alarmsDatagridModel = alarmsDatagrid.Children.GetVariable("Model");

        affinityId = alarmsDatagrid.Context.AssignAffinityId();

        try {
            RegisterObserverOnSessionLocaleIdChanged(alarmsDatagrid.Context);
        }
        catch (NullReferenceException){}
    }

    public override void Stop()
    {
        if (localeIdsRegistration != null)
        {
            localeIdsRegistration.Dispose();
            localeIdsRegistration = null;
        }

        if (localeIdChangedObserver != null)
            localeIdChangedObserver = null;

    }

    public void RegisterObserverOnSessionLocaleIdChanged(IContext context)
    {
        var currentSessionLocaleIds = context.Sessions.CurrentSessionInfo.SessionObject.Children["ActualLocaleIds"];

        localeIdChangedObserver = new CallbackVariableChangeObserver((IUAVariable variable, UAValue newValue, UAValue oldValue, uint[] _, ulong __) =>
        {
            //reset datagrid model variable to trigger locale changed event
            var dynamicLink = alarmsDatagridModel.GetVariable("DynamicLink");
            if (dynamicLink == null)
                return;

            string dynamicLinkValue = dynamicLink.Value;
            dynamicLink.Value = string.Empty;
            dynamicLink.Value = dynamicLinkValue;
        });

        localeIdsRegistration = currentSessionLocaleIds.RegisterEventObserver(
            localeIdChangedObserver, EventType.VariableValueChanged, affinityId);
    }

    IEventRegistration localeIdsRegistration;
    IEventObserver localeIdChangedObserver;
    uint affinityId;
    DataGrid alarmsDatagrid;
    IUAVariable alarmsDatagridModel;
}
  5. Save the code.