prs/prs.mobile.new/PRS.Mobile/CustomControls/Selection Screens/SelectionView.xaml.cs

using System;
using Xamarin.Forms.Xaml;

namespace PRS.Mobile
{

    public class SelectionViewConfigureArgs : EventArgs
    {
        public MobileGridColumns Columns { get; private set; }
        
        public SelectionViewConfigureArgs(MobileGridColumns columns)
        {
            Columns = columns;
        }
    }

    public delegate void SelectionViewConfigureEvent(object sender, SelectionViewConfigureArgs args);

    public class SelectionViewRefreshArgs : EventArgs
    {
        public bool Force { get; private set; }

        public SelectionViewRefreshArgs(bool force)
        {
            Force = force;
        }
    }
    
    public delegate object SelectionViewRefreshEvent(object sender, SelectionViewRefreshArgs args);
    
    public class SelectionViewSelectionChangedArgs : EventArgs
    {
        public object[] SelectedItems { get; private set; }

        public SelectionViewSelectionChangedArgs(object[] selecteditems)
        {
            SelectedItems = selecteditems;
        }
    }
    
    public delegate void SelectionViewSelectionChangedEvent(object sender, SelectionViewSelectionChangedArgs args);
    
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class SelectionView
    {
        private SelectionPageMode _mode = SelectionPageMode.Immediate;

        public SelectionPageMode Mode
        {
            get => _mode;
            set
            {
                _mode = value;
                Items.SelectionMode = value == SelectionPageMode.MultiSelect
                    ? MobileGridSelectionMode.Multiple
                    : MobileGridSelectionMode.Single;
            }
        }

        public object[] SelectedItems => Items.SelectedItems;
        public event SelectionViewConfigureEvent Configure;
        public event SelectionViewRefreshEvent Refresh;
        public event SelectionViewSelectionChangedEvent SelectionChanged;

        public bool CanSearch
        {
            get => Items.CanSearch;
            set => Items.CanSearch = value;
        }

        public SelectionView()
        {
            Mode = SelectionPageMode.Immediate;
            InitializeComponent();
        }

        public void Load()
        {
            Configure?.Invoke(this, new SelectionViewConfigureArgs(Items.Columns));
            
            Items.SelectionMode = Mode == SelectionPageMode.MultiSelect
                ? MobileGridSelectionMode.Multiple
                : MobileGridSelectionMode.Single;
            
            Items.PullToRefresh = true;
            Items.ItemsSource = Refresh?.Invoke(this, new SelectionViewRefreshArgs(false));
        }


        private void Items_OnRefreshRequested(object sender, MobileGridRefreshRequestArgs args)
        {
            var items = Refresh?.Invoke(this, new SelectionViewRefreshArgs(true));
            Items.ItemsSource = items;
        }

        private void Items_OnSelectionChanged(object sender, MobileGridSelectionArgs args)
        {
            if (Mode == SelectionPageMode.Immediate)
                SelectionChanged?.Invoke(this, new SelectionViewSelectionChangedArgs(Items.SelectedItems));
        }
        
    }
}