bykovme/nswallet

using System;
using FFImageLoading.Forms;
using NSWallet.NetStandard.Helpers.Fonts;
using NSWallet.NetStandard.Helpers.UI.NavigationHeader;
using NSWallet.Shared;
using Xamarin.Forms;

namespace NSWallet.NetStandard
{
    public class ExportImportScreenView : ContentPage
    {
        ExportImportScreenViewModel pageVM;

        public ExportImportScreenView()
        {
            pageVM = new ExportImportScreenViewModel();
            BindingContext = pageVM;

            UINavigationHeader.SetCommonTitleView(this, TR.Tr("menu_export_import"));

            BackgroundColor = Theme.Current.ListBackgroundColor;

            var mainStackLayout = AddMainLayout();

            AddGroup(mainStackLayout, TR.Tr("section_export"));
            AddListButton(mainStackLayout, "GeneratePDFCommand", TR.Tr("export_pdf"), Theme.Current.IEMenuExport2PDF);
            AddSeparator(mainStackLayout);
            AddListButton(mainStackLayout, "GenerateTXTCommand", TR.Tr("export_txt"), Theme.Current.IEMenuExport2TXT);
            AddGroup(mainStackLayout, TR.Tr("section_import"));
            AddListButton(mainStackLayout, "ImportBackupCommand", TR.Tr("import_backup"), Theme.Current.IEMenuImportFromBackup);

            AddSeparator(mainStackLayout);

            pageVM.ShowImportHelpCallback = ShowImportHelp;

            Content = new ScrollView {
                Content = mainStackLayout
            };
        }

        static StackLayout AddMainLayout() {
            return new StackLayout {
                BackgroundColor = Theme.Current.ListBackgroundColor,
                VerticalOptions = LayoutOptions.StartAndExpand,
                HorizontalOptions = LayoutOptions.Fill,
                Orientation = StackOrientation.Vertical,
                Spacing = 0
            };
        }

        void ShowImportHelp() {
            AppPages.ImportBackupHelp(Navigation);
        }

        static void AddSeparator(StackLayout settingsLayout)
        {
            var separator = new BoxView {
                Color = Theme.Current.ListSeparatorColor,
                HeightRequest = 1,
                Opacity = 0.5
            };

            settingsLayout.Children.Add(separator);
        }

        static void AddGroup(StackLayout layout, string groupName)
        {
            var groupLayout = new StackLayout {
                VerticalOptions = LayoutOptions.CenterAndExpand,
                HorizontalOptions = LayoutOptions.Fill,
                Orientation = StackOrientation.Horizontal,
                Spacing = 0,
                Padding = Theme.Current.InnerMenuPadding,
                BackgroundColor = Theme.Current.GroupBackground,
            };

            var group = new Label {
                Text = groupName,
                TextColor = Theme.Current.GroupTextColor,
                FontFamily = NSWFontsController.CurrentTypeface,
                FontSize = FontSizeController.GetSize(NamedSize.Medium, typeof(Label))
            };

            groupLayout.Children.Add(group);
            layout.Children.Add(groupLayout);
        }

        static void AddListButton(StackLayout stack, string modelCommand, string menuName, string menuIcon)
        {
            var itemsImportLayout = new StackLayout {
                VerticalOptions = LayoutOptions.CenterAndExpand,
                HorizontalOptions = LayoutOptions.Fill,
                Orientation = StackOrientation.Horizontal,
                Spacing = 0,
                Padding = Theme.Current.InnerMenuPadding
            };

            if (!string.IsNullOrEmpty(menuIcon)) {
                var itemImage = new CachedImage {
                    HeightRequest = Theme.Current.MenuIconHeight,
                    WidthRequest = Theme.Current.MenuIconWidth,
                    Source = ImageSource.FromStream(() => NSWRes.GetImage(menuIcon)),
                    Style = ImageProperties.DefaultCachedImageStyle
                };

                itemsImportLayout.Children.Add(itemImage);
                itemsImportLayout.Children.Add(new BoxView { Color = Color.Transparent, WidthRequest = Theme.Current.MenuBox_16 });
            } else {
                itemsImportLayout.Children.Add(new BoxView { Color = Color.Transparent, WidthRequest = Theme.Current.MenuBox_48 });
            }

            var itemStackLayout = new StackLayout();

            var itemLabel = new Label {
                HorizontalOptions = LayoutOptions.StartAndExpand,
                VerticalOptions = LayoutOptions.CenterAndExpand,
                FontSize = FontSizeController.GetSize(NamedSize.Medium, typeof(Label)),
                FontAttributes = Theme.Current.MenuLabelFontAttributes,
                TextColor = Theme.Current.ListTextColor,
                Opacity = 0.85,
                Text = menuName,
                FontFamily = NSWFontsController.CurrentBoldTypeface
            };

            itemStackLayout.Children.Add(itemLabel);
            itemsImportLayout.Children.Add(itemStackLayout);
            stack.Children.Add(itemsImportLayout);

            var tapGestureRecognizer = new TapGestureRecognizer();
            tapGestureRecognizer.SetBinding(TapGestureRecognizer.CommandProperty, modelCommand);
            itemsImportLayout.GestureRecognizers.Add(tapGestureRecognizer);
        }
    }
}