prs/prs.mobile.new/PRS.Mobile/Modules/Equipment/LiveMaps/LiveMapsMenu.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace PRS.Mobile
{

    public class LiveMapsMenuItem : BindableObject
    {
        public Guid ID { get; set; }
        public String Description { get; set; }
        public bool Selected { get; set; }

        public ImageSource SelectedImage =>
            Selected
                ? ImageSource.FromFile("checked")
                : ImageSource.FromFile("unchecked");
    }
    
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class LiveMapsMenu
    {

        private Task _data;

        private LiveMapsMenuItem[] _items;

        private Guid[] _selectedItems = new Guid[] { };
        public Guid[] SelectedItems
        {
            get => _selectedItems;
            set
            {
                _selectedItems = value;
                Refresh();
            }
        }
        
        public LiveMapsMenu()
        {
            _data = Task.Run(() => App.Data.EquipmentGroups.Refresh(false));
            
            InitializeComponent();
            
            _grid.Columns
                .BeginUpdate()
                .Clear()
                .Add(
                    new MobileGridImageColumn<LiveMapsMenuItem>()
                    {
                        Column = x => x.SelectedImage, 
                        Width = 30, 
                        Margin = 5, 
                        Header = ImageSource.FromFile("checked"), 
                        Tapped = ToggleSelection
                    })
                .Add(
                    new MobileGridTextColumn<LiveMapsMenuItem>()
                    {
                        Column = x => x.Description, 
                        Caption = "Select Categories",
                        Width = GridLength.Star,
                        Alignment = TextAlignment.Start
                    })

                .EndUpdate();
            
        }

        private void Refresh()
        {
            _data.Wait();
            _items = App.Data.EquipmentGroups.Items
                .Select(x => 
                    new LiveMapsMenuItem()
                    {
                        ID = x.ID, 
                        Description = x.Description, 
                        Selected = _selectedItems.Contains(x.ID)
                    })
                .Prepend(
                    new LiveMapsMenuItem()
                    {
                        ID = CoreUtils.FullGuid, 
                        Description = "Job Locations", 
                        Selected = _selectedItems.Contains(CoreUtils.FullGuid)
                    })
                .ToArray();
            _grid.ItemsSource = _items;
        }

        private void ToggleSelection(IMobileGridColumn column, object data)
        {
            if (data is LiveMapsMenuItem item)
                item.Selected = !item.Selected;
            _selectedItems = _items.Where(x => x.Selected).Select(x => x.ID).ToArray();
            DoChanged();
        }

        private void _selectall_Clicked(object sender, MobileButtonClickEventArgs args)
        {
            foreach (var item in _items)
                item.Selected = true;
            _selectedItems = _items.Where(x => x.Selected).Select(x => x.ID).ToArray();
            DoChanged();
        }

        private void _clearall_Clicked(object sender, MobileButtonClickEventArgs args)
        {
            foreach (var item in _items)
                item.Selected = false;
            _selectedItems = _items.Where(x => x.Selected).Select(x => x.ID).ToArray();
            DoChanged();
        }

        public event EventHandler Changed;
        
        private void DoChanged()
        {
            Changed?.Invoke(this,EventArgs.Empty);
        }
    }
}