Terminal.Gui/UICatalog/Scenarios/TextFormatterDemo.cs

using NStack;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Terminal.Gui;
using Rune = System.Rune;

namespace UICatalog {
	[ScenarioMetadata (Name: "TextFormatter Demo", Description: "Demos and tests the TextFormatter class.")]
	[ScenarioCategory ("Text")]
	[ScenarioCategory ("POC")]
	class TextFormatterDemo : Scenario {
		public override void Setup ()
		{
			// TODO: Move this to another Scenario that specifically tests `Views` that have no subviews.
			//Top.Text = "Press CTRL-Q to Quit. This is the Text for the TopLevel View. TextAlignment.Centered was specified. It is intentionally very long to illustrate word wrap.\n" +
			//	"<-- There is a new line here to show a hard line break. You should see this text bleed underneath the subviews, which start at Y = 3.";
			//Top.TextAlignment = TextAlignment.Centered;
			//Top.ColorScheme = Colors.Base;

			// Make Win smaller so sizing the window horizontally will make the
			// labels shrink to zero-width
			Win.X = 10;
			Win.Width = Dim.Fill (10);

			string text = "Hello world, how are you today? Pretty neat!\nSecond line\n\nFourth Line.";
			string unicode = "Τὴ γλῶσσα μοῦ ἔδωσαν ἑλληνικὴ\nτὸ σπίτι φτωχικὸ στὶς ἀμμουδιὲς τοῦ Ὁμήρου.\nΜονάχη ἔγνοια ἡ γλῶσσα μου στὶς ἀμμουδιὲς τοῦ Ὁμήρου.";

			Label blockText = new Label () { ColorScheme = Colors.TopLevel, X = 0, Y = 0, Height = 10, Width = Dim.Fill (0) };

			var block = new StringBuilder ();
			block.AppendLine ("  ▄████  █    ██  ██▓      ▄████▄    ██████ ");
			block.AppendLine (" ██▒ ▀█▒ ██  ▓██▒▓██▒     ▒██▀ ▀█  ▒██    ▒ ");
			block.AppendLine ("▒██░▄▄▄░▓██  ▒██░▒██▒     ▒▓█    ▄ ░ ▓██▄   ");
			block.AppendLine ("░▓█  ██▓▓▓█  ░██░░██░     ▒▓▓▄ ▄██▒  ▒   ██▒");
			block.AppendLine ("░▒▓███▀▒▒▒█████▓ ░██░ ██▓ ▒ ▓███▀ ░▒██████▒▒");
			block.AppendLine (" ░▒   ▒ ░▒▓▒ ▒ ▒ ░▓   ▒▓▒ ░ ░▒ ▒  ░▒ ▒▓▒ ▒ ░");
			block.AppendLine ("  ░   ░ ░░▒░ ░ ░  ▒ ░ ░▒    ░  ▒   ░ ░▒  ░ ░");
			block.AppendLine ("░ ░   ░  ░░░ ░ ░  ▒ ░ ░   ░        ░  ░  ░  ");
			block.AppendLine ("      ░    ░      ░    ░  ░ ░            ░  ");
			block.AppendLine ("                       ░  ░                 "); 
			blockText.Text = ustring.Make (block.ToString ()); // .Replace(" ", "\u00A0"); // \u00A0 is 'non-breaking space
			Win.Add (blockText);

			var unicodeCheckBox = new CheckBox ("Unicode", Top.HotKeySpecifier == (Rune)' ') {
				X = 0,
				Y = Pos.Bottom (blockText) + 1,
			};

			Win.Add (unicodeCheckBox);

			var alignments = Enum.GetValues (typeof (Terminal.Gui.TextAlignment)).Cast<Terminal.Gui.TextAlignment> ().ToList ();
			var singleLines = new Label [alignments.Count];
			var multipleLines = new Label [alignments.Count];

			var multiLineHeight = 5;

			foreach (var alignment in alignments) {
				singleLines [(int)alignment] = new Label (text) { TextAlignment = alignment, X = 0, Width = Dim.Fill (), Height = 1, ColorScheme = Colors.Dialog };
				multipleLines [(int)alignment] = new Label (text) { TextAlignment = alignment, X = 0, Width = Dim.Fill (), Height = multiLineHeight, ColorScheme = Colors.Dialog };
			}

			var label = new Label ($"Demonstrating single-line (should clip):") { Y = Pos.Bottom (unicodeCheckBox) + 1 };
			Win.Add (label);
			foreach (var alignment in alignments) {
				label = new Label ($"{alignment}:") { Y = Pos.Bottom (label) };
				Win.Add (label);
				singleLines [(int)alignment].Y = Pos.Bottom (label);
				Win.Add (singleLines [(int)alignment]);
				label = singleLines [(int)alignment];
			}

			label = new Label ($"Demonstrating multi-line and word wrap:") { Y = Pos.Bottom (label) };
			Win.Add (label);
			foreach (var alignment in alignments) {
				label = new Label ($"{alignment}:") { Y = Pos.Bottom (label) };
				Win.Add (label);
				multipleLines [(int)alignment].Y = Pos.Bottom (label);
				Win.Add (multipleLines [(int)alignment]);
				label = multipleLines [(int)alignment];
			}

			unicodeCheckBox.Toggled += (previous) => {
				foreach (var alignment in alignments) {
					singleLines [(int)alignment].Text = previous ? text : unicode;
					multipleLines [(int)alignment].Text = previous ? text : unicode;
				}
			};
		}
	}
}