Terminal.Gui/UICatalog/Scenarios/Text.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Terminal.Gui;
using Terminal.Gui.TextValidateProviders;

namespace UICatalog.Scenarios;

[ScenarioMetadata ("Text Input Controls", "Tests all text input controls")]
[ScenarioCategory ("Controls")]
[ScenarioCategory ("Mouse and Keyboard")]
[ScenarioCategory ("Text and Formatting")]
public class Text : Scenario {
	Label _labelMirroringTimeField;

	TimeField _timeField;

	public override void Setup ()
	{
		// TextField is a simple, single-line text input control
		var textField = new TextField ("TextField with test text. Unicode shouldn't 𝔹Aℝ𝔽!") {
			X = 1,
			Y = 0,
			Width = Dim.Percent (50) - 1,
			// Height will be replaced with 1
			Height = 2
		};

		var singleWordGenerator = new SingleWordSuggestionGenerator ();
		textField.Autocomplete.SuggestionGenerator = singleWordGenerator;

		textField.TextChanging += TextField_TextChanging;

		void TextField_TextChanging (object sender, TextChangingEventArgs e)
		{
			singleWordGenerator.AllSuggestions = Regex.Matches (e.NewText, "\\w+")
				.Select (s => s.Value)
				.Distinct ().ToList ();
		}
		Win.Add (textField);

		var labelMirroringTextField = new Label (textField.Text) {
			X = Pos.Right (textField) + 1,
			Y = Pos.Top (textField),
			Width = Dim.Fill (1) - 1
		};
		Win.Add (labelMirroringTextField);

		textField.TextChanged += (s, prev) => {
			labelMirroringTextField.Text = textField.Text;
		};

		// TextView is a rich (as in functionality, not formatting) text editing control
		var textView = new TextView {
			X = 1,
			Y = Pos.Bottom (textField) + 1,
			Width = Dim.Percent (50) - 1,
			Height = Dim.Percent (30)
		};
		textView.Text = "TextView with some more test text. Unicode shouldn't 𝔹Aℝ𝔽!";
		textView.DrawContent += TextView_DrawContent;

		// This shows how to enable autocomplete in TextView.
		void TextView_DrawContent (object sender, DrawEventArgs e)
		{
			singleWordGenerator.AllSuggestions = Regex.Matches (textView.Text, "\\w+")
				.Select (s => s.Value)
				.Distinct ().ToList ();
		}
		Win.Add (textView);

		var labelMirroringTextView = new Label {
			X = Pos.Right (textView) + 1,
			Y = Pos.Top (textView),
			Width = Dim.Fill (1) - 1,
			Height = Dim.Height (textView) - 1
		};
		Win.Add (labelMirroringTextView);

		// Use ContentChanged to detect if the user has typed something in a TextView.
		// The TextChanged property is only fired if the TextView.Text property is
		// explicitly set
		textView.ContentsChanged += (s, a) => {
			labelMirroringTextView.Enabled = !labelMirroringTextView.Enabled;
			labelMirroringTextView.Text = textView.Text;
		};

		// By default TextView is a multi-line control. It can be forced to 
		// single-line mode.
		var chxMultiline = new CheckBox ("Multiline") {
			X = Pos.Left (textView),
			Y = Pos.Bottom (textView),
			Checked = textView.Multiline
		};
		Win.Add (chxMultiline);

		var chxWordWrap = new CheckBox ("Word Wrap") {
			X = Pos.Right (chxMultiline) + 2,
			Y = Pos.Top (chxMultiline),
			Checked = textView.WordWrap
		};
		chxWordWrap.Toggled += (s, e) => textView.WordWrap = (bool)e.NewValue;
		Win.Add (chxWordWrap);

		// TextView captures Tabs (so users can enter /t into text) by default;
		// This means using Tab to navigate doesn't work by default. This shows
		// how to turn tab capture off.
		var chxCaptureTabs = new CheckBox ("Capture Tabs") {
			X = Pos.Right (chxWordWrap) + 2,
			Y = Pos.Top (chxWordWrap),
			Checked = textView.AllowsTab
		};

		chxMultiline.Toggled += (s, e) => {
			textView.Multiline = (bool)e.NewValue;
			if (!textView.Multiline && (bool)chxWordWrap.Checked) {
				chxWordWrap.Checked = false;
			}
			if (!textView.Multiline && (bool)chxCaptureTabs.Checked) {
				chxCaptureTabs.Checked = false;
			}
		};

		var keyTab = textView.KeyBindings.GetKeyFromCommands (Command.Tab);
		var keyBackTab = textView.KeyBindings.GetKeyFromCommands (Command.BackTab);
		chxCaptureTabs.Toggled += (s, e) => {
			if (e.NewValue == true) {
				textView.KeyBindings.Add (keyTab, Command.Tab);
				textView.KeyBindings.Add (keyBackTab, Command.BackTab);
			} else {
				textView.KeyBindings.Remove (keyTab);
				textView.KeyBindings.Remove (keyBackTab);
			}
			textView.AllowsTab = (bool)e.NewValue;
		};
		Win.Add (chxCaptureTabs);

		var hexEditor = new HexView (new MemoryStream (Encoding.UTF8.GetBytes ("HexEditor Unicode that shouldn't 𝔹Aℝ𝔽!"))) {
			X = 1,
			Y = Pos.Bottom (chxMultiline) + 1,
			Width = Dim.Percent (50) - 1,
			Height = Dim.Percent (30)
		};
		Win.Add (hexEditor);

		var labelMirroringHexEditor = new Label {
			X = Pos.Right (hexEditor) + 1,
			Y = Pos.Top (hexEditor),
			Width = Dim.Fill (1) - 1,
			Height = Dim.Height (hexEditor) - 1
		};
		var array = ((MemoryStream)hexEditor.Source).ToArray ();
		labelMirroringHexEditor.Text = Encoding.UTF8.GetString (array, 0, array.Length);
		hexEditor.Edited += (s, kv) => {
			hexEditor.ApplyEdits ();
			var array = ((MemoryStream)hexEditor.Source).ToArray ();
			labelMirroringHexEditor.Text = Encoding.UTF8.GetString (array, 0, array.Length);
		};
		Win.Add (labelMirroringHexEditor);

		var dateField = new DateField (System.DateTime.Now) {
			X = 1,
			Y = Pos.Bottom (hexEditor) + 1,
			Width = 20
		};
		Win.Add (dateField);

		var labelMirroringDateField = new Label (dateField.Text) {
			X = Pos.Right (dateField) + 1,
			Y = Pos.Top (dateField),
			Width = Dim.Width (dateField),
			Height = Dim.Height (dateField)
		};
		Win.Add (labelMirroringDateField);

		dateField.TextChanged += (s, prev) => {
			labelMirroringDateField.Text = dateField.Text;
		};

		_timeField = new TimeField (DateTime.Now.TimeOfDay) {
			X = Pos.Right (labelMirroringDateField) + 5,
			Y = Pos.Bottom (hexEditor) + 1,
			Width = 20,
			IsShortFormat = false
		};
		Win.Add (_timeField);

		_labelMirroringTimeField = new Label (_timeField.Text) {
			X = Pos.Right (_timeField) + 1,
			Y = Pos.Top (_timeField),
			Width = Dim.Width (_timeField),
			Height = Dim.Height (_timeField)
		};
		Win.Add (_labelMirroringTimeField);

		_timeField.TimeChanged += TimeChanged;

		// MaskedTextProvider - uses .NET MaskedTextProvider
		var netProviderLabel = new Label ("NetMaskedTextProvider [ 999 000 LLL >LLL |AAA aaa ]") {
			X = Pos.Left (dateField),
			Y = Pos.Bottom (dateField) + 1
		};
		Win.Add (netProviderLabel);

		var netProvider = new NetMaskedTextProvider ("999 000 LLL >LLL |AAA aaa");

		var netProviderField = new TextValidateField (netProvider) {
			X = Pos.Right (netProviderLabel) + 1,
			Y = Pos.Y (netProviderLabel)
		};
		Win.Add (netProviderField);

		var labelMirroringNetProviderField = new Label (netProviderField.Text) {
			X = Pos.Right (netProviderField) + 1,
			Y = Pos.Top (netProviderField),
			Width = Dim.Width (netProviderField),
			Height = Dim.Height (netProviderField)
		};
		Win.Add (labelMirroringNetProviderField);

		netProviderField.Provider.TextChanged += (s, prev) => {
			labelMirroringNetProviderField.Text = netProviderField.Text;
		};

		// TextRegexProvider - Regex provider implemented by Terminal.Gui
		var regexProvider = new Label ("TextRegexProvider [ ^([0-9]?[0-9]?[0-9]|1000)$ ]") {
			X = Pos.Left (netProviderLabel),
			Y = Pos.Bottom (netProviderLabel) + 1
		};
		Win.Add (regexProvider);

		var provider2 = new TextRegexProvider ("^([0-9]?[0-9]?[0-9]|1000)$") { ValidateOnInput = false };
		var regexProviderField = new TextValidateField (provider2) {
			X = Pos.Right (regexProvider) + 1,
			Y = Pos.Y (regexProvider),
			Width = 30,
			TextAlignment = TextAlignment.Centered
		};
		Win.Add (regexProviderField);

		var labelMirroringRegexProviderField = new Label (regexProviderField.Text) {
			X = Pos.Right (regexProviderField) + 1,
			Y = Pos.Top (regexProviderField),
			Width = Dim.Width (regexProviderField),
			Height = Dim.Height (regexProviderField)
		};
		Win.Add (labelMirroringRegexProviderField);

		regexProviderField.Provider.TextChanged += (s, prev) => {
			labelMirroringRegexProviderField.Text = regexProviderField.Text;
		};

		var labelAppendAutocomplete = new Label ("Append Autocomplete:") {
			Y = Pos.Y (regexProviderField) + 2,
			X = 1
		};
		var appendAutocompleteTextField = new TextField {
			X = Pos.Right (labelAppendAutocomplete),
			Y = Pos.Top (labelAppendAutocomplete),
			Width = Dim.Fill ()
		};
		appendAutocompleteTextField.Autocomplete = new AppendAutocomplete (appendAutocompleteTextField);
		appendAutocompleteTextField.Autocomplete.SuggestionGenerator = new SingleWordSuggestionGenerator {
			AllSuggestions = new List<string> {
				"fish", "flipper", "fin", "fun", "the", "at", "there", "some", "my", "of", "be", "use", "her", "than", "and", "this", "an", "would", "first", "have", "each", "make", "water", "to", "from", "which", "like", "been", "in", "or", "she", "him", "call", "is", "one", "do", "into", "who", "you", "had", "how", "time", "oil", "that", "by", "their", "has", "its", "it", "word", "if", "look", "now", "he", "but", "will", "two", "find", "was", "not", "up", "more", "long", "for", "what", "other", "write",
				"down", "on", "all", "about", "go", "day", "are", "were", "out", "see", "did", "as", "we", "many", "number", "get", "with", "when", "then", "no", "come", "his", "your", "them", "way", "made", "they", "can", "these", "could", "may", "said", "so", "people", "part"
			}
		};

		Win.Add (labelAppendAutocomplete);
		Win.Add (appendAutocompleteTextField);
	}

	void TimeChanged (object sender, DateTimeEventArgs<TimeSpan> e) => _labelMirroringTimeField.Text = _timeField.Text;
}