Terminal.Gui/UICatalog/Scenarios/Localization.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading;
using Terminal.Gui;

namespace UICatalog.Scenarios {
	[ScenarioMetadata (Name: "Localization", Description: "Test for localization resources.")]
	[ScenarioCategory ("Text and Formatting")]
	[ScenarioCategory ("Tests")]
	public class Localization : Scenario {
		public CultureInfo CurrentCulture { get; private set; } = Thread.CurrentThread.CurrentUICulture;

		private CultureInfo [] _cultureInfoSource;
		private string [] _cultureInfoNameSource;
		private ComboBox _languageComboBox;
		private CheckBox _allowAnyCheckBox;
		private OpenMode _currentOpenMode = OpenMode.File;

		public override void Setup ()
		{
			base.Setup ();
			_cultureInfoSource = Application.SupportedCultures.Append (CultureInfo.InvariantCulture).ToArray ();
			_cultureInfoNameSource = Application.SupportedCultures.Select (c => $"{c.NativeName} ({c.Name})").Append ("Invariant").ToArray ();
			var languageMenus = Application.SupportedCultures
				.Select (c => new MenuItem ($"{c.NativeName} ({c.Name})", "", () => SetCulture (c)))
				.Concat (
					new MenuItem [] {
						null,
						new MenuItem ("Invariant", "", () => SetCulture (CultureInfo.InvariantCulture))
					}
				)
				.ToArray ();
			var menu = new MenuBar (new MenuBarItem [] {
				new MenuBarItem ("_File", new MenuItem [] {
					new MenuBarItem("_Language", languageMenus),
					null,
					new MenuItem ("_Quit", "", Quit),
				}),
			});
			Application.Top.Add (menu);

			var selectLanguageLabel = new Label ("Please select a language.") {
				X = 2,
				Y = 1,
				Width = Dim.Fill (2),
				AutoSize = true
			};
			Win.Add (selectLanguageLabel);

			_languageComboBox = new ComboBox (_cultureInfoNameSource) {
				X = 2,
				Y = Pos.Bottom (selectLanguageLabel) + 1,
				Width = _cultureInfoNameSource.Select (cn => cn.Length + 3).Max (),
				Height = _cultureInfoNameSource.Length + 1,
				HideDropdownListOnClick = true,
				AutoSize = true,
				SelectedItem = _cultureInfoNameSource.Length - 1
			};
			_languageComboBox.SelectedItemChanged += LanguageComboBox_SelectChanged;
			Win.Add (_languageComboBox);

			var textAndFileDialogLabel = new Label ("Right click on the text field to open a context menu, click the button to open a file dialog.\r\nOpen mode will loop through 'File', 'Directory' and 'Mixed' as 'Open' or 'Save' button clicked.") {
				X = 2,
				Y = Pos.Top (_languageComboBox) + 3,
				Width = Dim.Fill (2),
				AutoSize = true
			};
			Win.Add (textAndFileDialogLabel);

			var textField = new TextView {
				X = 2,
				Y = Pos.Bottom (textAndFileDialogLabel) + 1,
				Width = Dim.Fill (32),
				Height = 1
			};
			Win.Add (textField);

			_allowAnyCheckBox = new CheckBox {
				X = Pos.Right (textField) + 1,
				Y = Pos.Bottom (textAndFileDialogLabel) + 1,
				Checked = false,
				Text = "Allow any"
			};
			Win.Add (_allowAnyCheckBox);

			var openDialogButton = new Button ("Open") {
				X = Pos.Right (_allowAnyCheckBox) + 1,
				Y = Pos.Bottom (textAndFileDialogLabel) + 1
			};
			openDialogButton.Clicked += (sender, e) => ShowFileDialog (false);
			Win.Add (openDialogButton);

			var saveDialogButton = new Button ("Save") {
				X = Pos.Right (openDialogButton) + 1,
				Y = Pos.Bottom (textAndFileDialogLabel) + 1
			};
			saveDialogButton.Clicked += (sender, e) => ShowFileDialog (true);
			Win.Add (saveDialogButton);

			var wizardLabel = new Label ("Click the button to open a wizard.") {
				X = 2,
				Y = Pos.Bottom (textField) + 1,
				Width = Dim.Fill (2),
				AutoSize = true
			};
			Win.Add (wizardLabel);

			var wizardButton = new Button ("Open _wizard") {
				X = 2,
				Y = Pos.Bottom (wizardLabel) + 1
			};
			wizardButton.Clicked += (sender, e) => ShowWizard ();
			Win.Add (wizardButton);

			Win.Unloaded += (sender, e) => Quit ();
		}

		public void SetCulture (CultureInfo culture)
		{
			if (_cultureInfoSource [_languageComboBox.SelectedItem] != culture) {
				_languageComboBox.SelectedItem = Array.IndexOf (_cultureInfoSource, culture);
			}
			if (this.CurrentCulture == culture) return;
			this.CurrentCulture = culture;
			Thread.CurrentThread.CurrentUICulture = culture;
			Application.Refresh ();
		}
		private void LanguageComboBox_SelectChanged (object sender, ListViewItemEventArgs e)
		{
			if (e.Value is string cultureName) {
				var index = Array.IndexOf (_cultureInfoNameSource, cultureName);
				if (index >= 0) {
					SetCulture (_cultureInfoSource [index]);
				}
			}
		}
		public void ShowFileDialog (bool isSaveFile)
		{
			FileDialog dialog = isSaveFile ? new SaveDialog () : new OpenDialog ("", null, _currentOpenMode);
			dialog.AllowedTypes = new List<IAllowedType> () {
				(_allowAnyCheckBox.Checked ?? false) ? new AllowedTypeAny() : new AllowedType("Dynamic link library", ".dll"),
				new AllowedType("Json", ".json"),
				new AllowedType("Text", ".txt"),
				new AllowedType("Yaml", ".yml", ".yaml")
			};
			dialog.MustExist = !isSaveFile;
			dialog.AllowsMultipleSelection = !isSaveFile;
			_currentOpenMode++;
			if (_currentOpenMode > OpenMode.Mixed) {
				_currentOpenMode = OpenMode.File;
			}
			Application.Run (dialog);
		}
		public void ShowWizard ()
		{
			Wizard wizard = new Wizard {
				Height = 8,
				Width = 36,
				Title = "The wizard"
			};
			wizard.AddStep (new WizardStep () {
				HelpText = "Wizard first step",
			});
			wizard.AddStep (new WizardStep () {
				HelpText = "Wizard step 2",
				NextButtonText = ">>> (_N)"
			});
			wizard.AddStep (new WizardStep () {
				HelpText = "Wizard last step"
			});
			Application.Run (wizard);
		}
		public void Quit ()
		{
			SetCulture (CultureInfo.InvariantCulture);
			Application.RequestStop ();
		}
	}
}