Terminal.Gui/UICatalog/Scenarios/Dialogs.cs

using System;
using System.Collections.Generic;
using Terminal.Gui;

namespace UICatalog.Scenarios;

[ScenarioMetadata ("Dialogs", "Demonstrates how to the Dialog class")]
[ScenarioCategory ("Dialogs")]
public class Dialogs : Scenario
{
    private static readonly int CODE_POINT = '你'; // We know this is a wide char

    public override void Setup ()
    {
        var frame = new FrameView { X = Pos.Center (), Y = 1, Width = Dim.Percent (75), Title = "Dialog Options" };

        var numButtonsLabel = new Label
        {
            X = 0,
            TextAlignment = TextAlignment.Right,
            Text = "_Number of Buttons:"
        };

        var label = new Label {
            X = 0, 
            Y = 0,
            AutoSize = false,
            Width = Dim.Width (numButtonsLabel),
            Height = 1,
            TextAlignment = TextAlignment.Right,
            Text = "_Width:"
        };
        frame.Add (label);

        var widthEdit = new TextField
        {
            X = Pos.Right (numButtonsLabel) + 1,
            Y = Pos.Top (label),
            Width = 5,
            Height = 1,
            Text = "0"
        };
        frame.Add (widthEdit);

        label = new Label
        {
            AutoSize = false,
            X = 0,
            Y = Pos.Bottom (label),
            Width = Dim.Width (numButtonsLabel),
            Height = 1,
            TextAlignment = TextAlignment.Right,
            Text = "_Height:"
        };
        frame.Add (label);

        var heightEdit = new TextField
        {
            X = Pos.Right (numButtonsLabel) + 1,
            Y = Pos.Top (label),
            Width = 5,
            Height = 1,
            Text = "0"
        };
        frame.Add (heightEdit);

        frame.Add (
                   new Label { X = Pos.Right (widthEdit) + 2, Y = Pos.Top (widthEdit), Text = "If height & width are both 0," }
                  );

        frame.Add (
                   new Label
                   {
                       X = Pos.Right (heightEdit) + 2,
                       Y = Pos.Top (heightEdit),
                       Text = "the Dialog will size to 80% of container."
                   }
                  );

        label = new Label
        {
            AutoSize = false,
            X = 0,
            Y = Pos.Bottom (label),
            Width = Dim.Width (numButtonsLabel),
            Height = 1,
            TextAlignment = TextAlignment.Right,
            Text = "_Title:"
        };
        frame.Add (label);

        var titleEdit = new TextField
        {
            X = Pos.Right (label) + 1,
            Y = Pos.Top (label),
            Width = Dim.Fill (),
            Height = 1,
            Text = "Title"
        };
        frame.Add (titleEdit);

        numButtonsLabel.Y = Pos.Bottom (label);
        frame.Add (numButtonsLabel);

        var numButtonsEdit = new TextField
        {
            X = Pos.Right (numButtonsLabel) + 1,
            Y = Pos.Top (numButtonsLabel),
            Width = 5,
            Height = 1,
            Text = "3"
        };
        frame.Add (numButtonsEdit);

        var glyphsNotWords = new CheckBox
        {
            X = Pos.Right (numButtonsLabel) + 1,
            Y = Pos.Bottom (numButtonsLabel),
            TextAlignment = TextAlignment.Right,
            Text = $"_Add {char.ConvertFromUtf32 (CODE_POINT)} to button text to stress wide char support",
            Checked = false
        };
        frame.Add (glyphsNotWords);

        label = new Label
        {
            AutoSize = false,
            X = 0,
            Y = Pos.Bottom (glyphsNotWords),
            Width = Dim.Width (numButtonsLabel),
            Height = 1,
            TextAlignment = TextAlignment.Right,
            Text = "Button St_yle:"
        };
        frame.Add (label);
        var styleRadioGroup = new RadioGroup
        {
            X = Pos.Right (label) + 1,
            Y = Pos.Top (label),
            RadioLabels = new [] { "_Center", "_Justify", "_Left", "_Right" }
        };
        frame.Add (styleRadioGroup);

        frame.ValidatePosDim = true;

        void Top_LayoutComplete (object sender, EventArgs args)
        {
            frame.Height =
                widthEdit.Frame.Height
                + heightEdit.Frame.Height
                + titleEdit.Frame.Height
                + numButtonsEdit.Frame.Height
                + glyphsNotWords.Frame.Height
                + styleRadioGroup.Frame.Height
                + frame.GetAdornmentsThickness ().Vertical;
        }

        Application.Top.LayoutComplete += Top_LayoutComplete;

        Win.Add (frame);

        label = new Label
        {
            X = Pos.Center (), Y = Pos.Bottom (frame) + 4, TextAlignment = TextAlignment.Right, Text = "Button Pressed:"
        };
        Win.Add (label);

        var buttonPressedLabel = new Label
        {
            X = Pos.Center (), Y = Pos.Bottom (frame) + 5, ColorScheme = Colors.ColorSchemes ["Error"], Text = " "
        };

        // glyphsNotWords
        // false:var btnText = new [] { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" };
        // true: var btnText = new [] { "0", "\u2780", "➁", "\u2783", "\u2784", "\u2785", "\u2786", "\u2787", "\u2788", "\u2789" };
        // \u2781 is ➁ dingbats \ufb70 is	

        var showDialogButton = new Button
        {
            X = Pos.Center (), Y = Pos.Bottom (frame) + 2, IsDefault = true, Text = "_Show Dialog"
        };

        showDialogButton.Accept += (s, e) =>
                                    {
                                        Dialog dlg = CreateDemoDialog (
                                                                       widthEdit,
                                                                       heightEdit,
                                                                       titleEdit,
                                                                       numButtonsEdit,
                                                                       glyphsNotWords,
                                                                       styleRadioGroup,
                                                                       buttonPressedLabel
                                                                      );
                                        Application.Run (dlg);
                                    };

        Win.Add (showDialogButton);

        Win.Add (buttonPressedLabel);
    }

    private Dialog CreateDemoDialog (
        TextField widthEdit,
        TextField heightEdit,
        TextField titleEdit,
        TextField numButtonsEdit,
        CheckBox glyphsNotWords,
        RadioGroup styleRadioGroup,
        Label buttonPressedLabel
    )
    {
        Dialog dialog = null;

        try
        {
            var width = 0;
            int.TryParse (widthEdit.Text, out width);
            var height = 0;
            int.TryParse (heightEdit.Text, out height);
            var numButtons = 3;
            int.TryParse (numButtonsEdit.Text, out numButtons);

            List<Button> buttons = new ();
            int clicked = -1;

            for (var i = 0; i < numButtons; i++)
            {
                int buttonId = i;
                Button button = null;

                if (glyphsNotWords.Checked == true)
                {
                    buttonId = i;

                    button = new Button
                    {
                        Text = NumberToWords.Convert (buttonId) + " " + char.ConvertFromUtf32 (buttonId + CODE_POINT),
                        IsDefault = buttonId == 0
                    };
                }
                else
                {
                    button = new Button { Text = NumberToWords.Convert (buttonId), IsDefault = buttonId == 0 };
                }

                button.Accept += (s, e) =>
                                  {
                                      clicked = buttonId;
                                      Application.RequestStop ();
                                  };
                buttons.Add (button);
            }

            //if (buttons.Count > 1) {
            //	buttons [1].Text = "Accept";
            //	buttons [1].IsDefault = true;
            //	buttons [0].Visible = false;
            //	buttons [0].Text = "_Back";
            //	buttons [0].IsDefault = false;
            //}

            // This tests dynamically adding buttons; ensuring the dialog resizes if needed and 
            // the buttons are laid out correctly
            dialog = new Dialog
            {
                Title = titleEdit.Text,
                ButtonAlignment = (Dialog.ButtonAlignments)styleRadioGroup.SelectedItem,
                Buttons = buttons.ToArray ()
            };

            if (height != 0 || width != 0)
            {
                dialog.Height = height;
                dialog.Width = width;
            }

            var add = new Button { X = Pos.Center (), Y = Pos.Center (), Text = "_Add a button" };

            add.Accept += (s, e) =>
                           {
                               int buttonId = buttons.Count;
                               Button button;

                               if (glyphsNotWords.Checked == true)
                               {
                                   button = new Button
                                   {
                                       Text = NumberToWords.Convert (buttonId) + " " + char.ConvertFromUtf32 (buttonId + CODE_POINT),
                                       IsDefault = buttonId == 0
                                   };
                               }
                               else
                               {
                                   button = new Button { Text = NumberToWords.Convert (buttonId), IsDefault = buttonId == 0 };
                               }

                               button.Accept += (s, e) =>
                                                 {
                                                     clicked = buttonId;
                                                     Application.RequestStop ();
                                                 };
                               buttons.Add (button);
                               dialog.AddButton (button);

                               if (buttons.Count > 1)
                               {
                                   button.TabIndex = buttons [buttons.Count - 2].TabIndex + 1;
                               }
                           };
            dialog.Add (add);

            var addChar = new Button
            {
                X = Pos.Center (),
                Y = Pos.Center () + 1,
                Text = $"A_dd a {char.ConvertFromUtf32 (CODE_POINT)} to each button"
            };

            addChar.Accept += (s, e) =>
                               {
                                   foreach (Button button in buttons)
                                   {
                                       button.Text += char.ConvertFromUtf32 (CODE_POINT);
                                   }

                                   dialog.LayoutSubviews ();
                               };
            dialog.Closed += (s, e) => { buttonPressedLabel.Text = $"{clicked}"; };
            dialog.Add (addChar);
        }
        catch (FormatException)
        {
            buttonPressedLabel.Text = "Invalid Options";
        }

        return dialog;
    }
}