prs/prs.mobile.new/PRS.Mobile/CustomControls/BasePage/BasePage.xaml.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using InABox.Clients;
using InABox.Core;
using InABox.Mobile;
using Plugin.Media;
using Syncfusion.XForms.PopupLayout;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using XF.Material.Forms.UI.Dialogs;

namespace PRS.Mobile
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class BasePage 
    {
        public IList<View> AlternateMenu => _alternateMenu.Children;
        
        public IList<View> PrimaryMenu => _primaryMenu.Children;
        
        public IList<View> PageContent => _content.Children;

        public bool BackButtonEnabled
        {
            get => _backButton.IsVisible;
            set => _backButton.IsVisible = value;
        }

        public event EventHandler BackButtonClicked;
        
        private SfPopupLayout _popup = new SfPopupLayout();
        
        public BasePage()
        {
            InitializeComponent();
            _titleBar.BackgroundColor = XF.Material.Forms.Material.Color.Primary;
            _titleLabel.TextColor = XF.Material.Forms.Material.Color.OnPrimary;
            BackgroundColor = Color.WhiteSmoke;
        }
        
        protected override void OnAppearing()
        {
            XF.Material.Forms.Material.PlatformConfiguration.ChangeStatusBarColor(XF.Material.Forms.Material.Color.PrimaryVariant);
            App.Data.TransportConnected += TransportConnected;
            App.Data.TransportDisconnected += TransportDisconnected; 
            UpdateTransportStatus();
            base.OnAppearing();
        }

        protected override void OnDisappearing()
        {
            App.Data.TransportConnected -= TransportConnected;
            App.Data.TransportDisconnected -= TransportDisconnected;
            base.OnDisappearing();
        }

        private void TransportDisconnected(TransportDisconnectedEventArgs args) => UpdateConnectionStatus();

        private void TransportConnected(TransportConnectedEventArgs args) => UpdateConnectionStatus();
        
        private void UpdateConnectionStatus()
        {
            Device.BeginInvokeOnMainThread(UpdateTransportStatus);
        }
        
        //private static Task<IMaterialModalPage> _snackbar = null;
        
        protected virtual void UpdateTransportStatus()
        {
            // ConnectionIndicator.Image = App.Data.IsConnected()
            //     ? ImageSource.FromFile("transparent.png")
            //     : ImageSource.FromFile("disconnected.png"); //ImageSource.FromFile("Images/nodata.png");
            _connectionIndicator.IsVisible = !App.Data.IsConnected();
            
            // if (!App.Data.IsConnected() && (_snackbar == null))
            //     _snackbar = MaterialDialog.Instance.LoadingSnackbarAsync(message: "No Connection Available!");
            //
            // else if (App.Data.IsConnected() && (_snackbar != null) && (_snackbar.Result != null))
            // {
            //     _snackbar.Result.DismissAsync();
            //     _snackbar = null;
            // }
        }

        private void _backButton_OnClicked(object sender, EventArgs e)
        {
            if (OnBackButtonPressed())
            {
                BackButtonClicked?.Invoke(this, EventArgs.Empty);
                Navigation.PopAsync();
            }
        }

        protected override bool OnBackButtonPressed()
        {
            return true;
        }

        protected void ShowPopup(Func<View> view, int height = 500, int width = 300, int padding = 10)
        {
            _popup.PopupView.HeightRequest = height;
            _popup.PopupView.WidthRequest = width;
            _popup.PopupView.ShowHeader = false;
            _popup.PopupView.ShowFooter = false;
            _popup.PopupView.ContentTemplate = new DataTemplate(() =>
            {
                Grid grid = new Grid() { Margin = padding, Padding = padding};
                grid.Children.Add(view());
                return grid;
            });
            _popup.Show();
        }

        protected void DismissPopup()
        {
            _popup.Dismiss();
        }

        public bool ProgressVisible
        {
            get => activity_indicator.IsRunning;
            set => activity_indicator.IsRunning = value;
        }
        
        protected async Task<T> TakePhoto<T>(Func<T> shell) where T : IEntityDocumentShell
        {
            T result = default(T);
            
            await CrossMedia.Current.Initialize();

            if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakePhotoSupported)
            {
                await DisplayAlert("No Camera", ":( No camera available.", "OK");
                return result;
            }

            String filename = $"{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff}.png";

            var file = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
            {
                Name = filename,
                CompressionQuality = 5,
                PhotoSize = Plugin.Media.Abstractions.PhotoSize.Large
            });

            if (file == null)
                return result;

            using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Adding Photo"))
            {
                byte[] data;
                await using (var stream = file.GetStream())
                {
                    BinaryReader br = new BinaryReader(stream);
                    data = br.ReadBytes((int)stream.Length);
                }
                
                Document doc = new Document()
                {
                    FileName = filename,
                    Data = data,
                    CRC = CoreUtils.CalculateCRC(data),
                    TimeStamp = DateTime.Now
                };
                new Client<Document>().Save(doc, "Photo taken on mobile device");
                
                result = shell();
                result.DocumentID = doc.ID;
                result.FileName = doc.FileName;
                result.Thumbnail = MobileUtils.ImageTools.CreateThumbnail(doc.Data, 128, 128);
                result.Save("Photo taken on mobile device");
            }
            return result;
        }

        protected async Task<T> ChoosePhoto<T>(Func<T> shell) where T : IEntityDocumentShell
        {
            var result = default(T);
            await CrossMedia.Current.Initialize();
        
            if (!CrossMedia.Current.IsPickPhotoSupported)
            {
                await DisplayAlert("No Library", ":( No Photo Library available.", "OK");
                return result;
            }
    
            var file = await CrossMedia.Current.PickPhotoAsync(new Plugin.Media.Abstractions.PickMediaOptions()
            {
                CompressionQuality = 5,
                PhotoSize = Plugin.Media.Abstractions.PhotoSize.Large
            });
    
            if (file == null)
                return result;
    
    
            using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Adding Photo"))
            {
                
                byte[] data;
                await using (var stream = file.GetStream())
                {
                    BinaryReader br = new BinaryReader(stream);
                    data = br.ReadBytes((int)stream.Length);
                }
            
                Document doc = new Document()
                {
                    FileName = file.OriginalFilename,
                    Data = data,
                    CRC = CoreUtils.CalculateCRC(data),
                    TimeStamp = DateTime.Now
                };
                new Client<Document>().Save(doc, "Photo chosen from mobile library");
            
                result = shell();
                result.DocumentID = doc.ID;
                result.FileName = doc.FileName;
                result.Thumbnail = MobileUtils.ImageTools.CreateThumbnail(doc.Data, 128, 128);
                result.Save("Photo chosen from mobile library");
                
            }
            return result;
        }
        
    }
}