Terminal.Gui/Examples/UICatalog/Scenarios/Dialogs.cs

#nullable enable
namespace UICatalog.Scenarios;

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

    public override void Main ()
    {
        Application.Init ();

        using IApplication app = Application.Instance;

        using Window mainWindow = new ();
        mainWindow.Title = GetQuitKeyAndName ();

        FrameView frame = new ()
        {
            TabStop = TabBehavior.TabStop, // FrameView normally sets to TabGroup
            X = Pos.Center (),
            Y = 1,
            Width = Dim.Percent (75),
            Height = Dim.Auto (DimAutoStyle.Content),
            Title = "Dialog Options"
        };

        Label numButtonsLabel = new ()
        {
            X = 0,
            TextAlignment = Alignment.End,
            Text = "_Number of Buttons:"
        };

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

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

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

        TextField heightEdit = new ()
        {
            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 width is 0, the dimension will be greater than {Dialog.DefaultMinimumWidth}%."
                   }
                  );

        frame.Add (
                   new Label
                   {
                       X = Pos.Right (heightEdit) + 2,
                       Y = Pos.Top (heightEdit),
                       Text = $"If height is 0, the dimension will be greater {Dialog.DefaultMinimumHeight}%."
                   }
                  );

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

        TextField titleEdit = new ()
        {
            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);

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

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

        label = new ()
        {
            X = 0,
            Y = Pos.Bottom (glyphsNotWords),
            Width = Dim.Width (numButtonsLabel),
            Height = 1,
            TextAlignment = Alignment.End,
            Text = "Button A_lignment:"
        };
        frame.Add (label);

        OptionSelector<Alignment> alignmentOptionSelector = new ()
        {
            X = Pos.Right (label) + 1,
            Y = Pos.Top (label),
            Title = "Ali_gn",
            AssignHotKeys = true
        };
        frame.Add (alignmentOptionSelector);
        alignmentOptionSelector.Value = Dialog.DefaultButtonAlignment;

        frame.ValidatePosDim = true;

        mainWindow.Add (frame);

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

        Label buttonPressedLabel = new ()
        {
            X = Pos.Center (), Y = Pos.Bottom (frame) + 5, SchemeName = "Error", Text = " "
        };

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

        mainWindow.Accepting += (s, e) =>
                                   {
                                       Dialog? dlg = CreateDemoDialog (
                                                                       widthEdit,
                                                                       heightEdit,
                                                                       titleEdit,
                                                                       numButtonsEdit,
                                                                       glyphsNotWords,
                                                                       alignmentOptionSelector,
                                                                       buttonPressedLabel
                                                                      );

                                       if (dlg is null)
                                       {
                                           MessageBox.ErrorQuery ((s as View)!.App!, "Error", "Could not create Dialog. Invalid options.", "_Ok");
                                       }
                                       else
                                       {
                                           app.Run (dlg);
                                           dlg.Dispose ();
                                       }

                                       e.Handled = true;
                                   };

        mainWindow.Add (showDialogButton, buttonPressedLabel);

        app.Run (mainWindow);
    }

    private static Dialog? CreateDemoDialog (
        TextField widthEdit,
        TextField heightEdit,
        TextField titleEdit,
        TextField numButtonsEdit,
        CheckBox glyphsNotWords,
        OptionSelector alignmentGroup,
        Label buttonPressedLabel
    )
    {
        if (!int.TryParse (widthEdit.Text, out int width)
            || !int.TryParse (heightEdit.Text, out int height)
            || !int.TryParse (numButtonsEdit.Text, out int numButtons))
        {
            return null;
        }

        // Add the buttons that go on the bottom of the dialog
        List<Button> dlgButtons = [];
        int clicked = -1;

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

            if (glyphsNotWords.CheckedState == CheckState.Checked)
            {
                buttonId = i;

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

            button.Accepting += (s, e) =>
                                {
                                    clicked = buttonId;
                                    e.Handled = true;
                                    (s as View)!.App?.RequestStop ();
                                };
            dlgButtons.Add (button);
        }

        // This tests dynamically adding buttons; ensuring the dialog resizes if needed and
        // the buttons are laid out correctly
        Dialog dialog = new ()
        {
            Title = titleEdit.Text,
            Text = "Dialog Text - Test",
            ButtonAlignment = (Alignment)Enum.Parse (typeof (Alignment), alignmentGroup.Labels! [alignmentGroup.Value!.Value] [0..]),

            Buttons = dlgButtons.ToArray ()
        };

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


        dialog.IsRunningChanged += (_, e) =>
                                   {
                                       if (!e.Value)
                                       {
                                           buttonPressedLabel.Text = $"{clicked}";
                                       }
                                   };


        return dialog;
    }

    public override List<Key> GetDemoKeyStrokes ()
    {
        List<Key> keys =
        [
            Key.D6,
            Key.D5,
            Key.Tab,
            Key.D2,
            Key.D0,
            Key.Enter
        ];

        for (int i = 0; i < 5; i++)
        {
            keys.Add (Key.A);
        }
        keys.Add (Key.Enter);

        keys.Add (Key.S.WithAlt);
        keys.Add (Key.Enter);
        for (int i = 0; i < 5; i++)
        {
            keys.Add (Key.A);
        }
        keys.Add (Key.Enter);

        keys.Add (Key.E.WithAlt);
        keys.Add (Key.Enter);
        for (int i = 0; i < 5; i++)
        {
            keys.Add (Key.A);
        }
        keys.Add (Key.Enter);

        keys.Add (Key.C.WithAlt);
        keys.Add (Key.Enter);
        for (int i = 0; i < 5; i++)
        {
            keys.Add (Key.A);
        }
        keys.Add (Key.Enter);

        keys.Add (Key.F.WithAlt);
        keys.Add (Key.Enter);
        for (int i = 0; i < 5; i++)
        {
            keys.Add (Key.A);
        }
        keys.Add (Key.Enter);

        return keys;
    }
}