inabox/InABox.Mobile/InABox.Mobile.Shared/PopupManager.cs

using System;
using Syncfusion.XForms.PopupLayout;
using Xamarin.Forms;

namespace InABox.Mobile
{
    public interface IPopupManager
    {
        bool Initialise();
        
    }

    public class PopupManagerConfiguration
    {
        public int RequestedHeight { get; set; } = 700;
        public int RequestedWidth { get; set; } = 350;
        public bool ShowHeader { get; set; } = false;
        public bool ShowFooter { get; set; } = false;
        public int Padding { get; set; } = 10;

        public int CornerRadius { get; set; } = 5;
        public bool Modal { get; set; } = false;
    }
    
    public static class PopupManager
    {
        
        private static SfPopupLayout _popup = null;

        
        private static ContentPage FindParentPage(Element view)
        {
            if (view is ContentPage page)
                return page;
            return FindParentPage(view.Parent);
        }
        
        public static void DisplayError(Element view, string message)
        {
            MobileLogging.Log("Unable to create Popup Layout!");
            var page = FindParentPage(view);
            Device.BeginInvokeOnMainThread(() =>
            { 
                page.DisplayAlert("Error", message, "OK");
            }); 
        }

        public static void ShowPopup(Element parent, Func<View> view, PopupManagerConfiguration config = null)
        {

            if (_popup == null)
            {
                var service = DependencyService.Get<IPopupManager>();
                if (service.Initialise())
                    _popup = new SfPopupLayout();
            }

            if (_popup == null)
            {
                DisplayError(parent, "Unable to create Popup!\nPlease try again or restart the application.");
                return;
            }

            var cfg = config ?? new PopupManagerConfiguration();
            
            _popup.PopupView.HeightRequest = cfg.RequestedHeight;
            _popup.PopupView.WidthRequest = cfg.RequestedWidth;
            _popup.PopupView.ShowHeader = cfg.ShowHeader;
            _popup.PopupView.ShowFooter = cfg.ShowFooter;
            _popup.PopupView.PopupStyle.CornerRadius = cfg.CornerRadius;
            _popup.StaysOpen = cfg.Modal;
            
            _popup.PopupView.ContentTemplate = new DataTemplate(() =>
            {
                Grid grid = new Grid() { Padding = cfg.Padding };
                grid.Children.Add(view());
                return grid;
            });
            
            _popup.Show();
        }

        public static void DismissPopup()
        {
            if (_popup != null)
                _popup.Dismiss();
        }
    }
}