prs/prs.mobile.new/PRS.Mobile/CustomControls/Selection Screens/EmployeeMultiSelectionPage.cs

using System;
using System.Linq;
using InABox.Mobile;
using Xamarin.Forms;

namespace PRS.Mobile
{
    public class EmployeeMultiSelectionPage : SelectionPage
    {
        public EmployeeMultiSelectionPage(Action<EmployeeShell[]> action) 
            : base(
                (string)"SelectEmployee", 
                (SelectionPageMode)SelectionPageMode.MultiSelect,
                (columns, filters) =>
                {
                    columns
                        .BeginUpdate()
                        .Clear()
                        .Add(new MobileGridTextColumn<EmployeeShell>()
                            { Column = x => x.Code, Width = GridLength.Auto })
                        .Add(new MobileGridTextColumn<EmployeeShell>()
                            { Column = x => x.Name, Width = GridLength.Star })
                        .EndUpdate();

                }, 
                (args) =>
                {
                    App.Data.Employees.SelectFilter(args.Filter);
                    var result = App.Data.Employees.Refresh(args.Force);
                    args.LastUpdated = App.Data.Employees.LastUpdated;
                    return result;
                },
                (items) => action?.Invoke(items.OfType<EmployeeShell>().ToArray())
            ) { }
    }
}