TreeViewForms.cs

using System.Threading.Tasks;
using TelegramBotBase.Args;
using TelegramBotBase.Base;
using TelegramBotBase.Controls.Inline;
using TelegramBotBase.Enums;
using TelegramBotBase.Form;

namespace TelegramBotBase.Example.Tests.Controls;

public class TreeViewForms : AutoCleanForm
{
    public TreeViewForms()
    {
        DeleteMode = EDeleteMode.OnLeavingForm;
        Init += TreeViewForms_Init;
    }

    public TreeView View { get; set; }

    private int? MessageId { get; set; }

    private Task TreeViewForms_Init(object sender, InitEventArgs e)
    {
        View = new TreeView();

        var tvn = new TreeViewNode("Cars", "cars");

        tvn.AddNode(new TreeViewNode("Porsche", "porsche",
                                     new TreeViewNode("Website", "web", "https://www.porsche.com/germany/"),
                                     new TreeViewNode("911", "911"),
                                     new TreeViewNode("918 Spyder", "918")));
        tvn.AddNode(new TreeViewNode("BMW", "bmw"));
        tvn.AddNode(new TreeViewNode("Audi", "audi"));
        tvn.AddNode(new TreeViewNode("VW", "vw"));
        tvn.AddNode(new TreeViewNode("Lamborghini", "lamborghini"));

        View.Nodes.Add(tvn);

        tvn = new TreeViewNode("Fruits", "fruits");

        tvn.AddNode(new TreeViewNode("Apple", "apple"));
        tvn.AddNode(new TreeViewNode("Orange", "orange"));
        tvn.AddNode(new TreeViewNode("Lemon", "lemon"));

        View.Nodes.Add(tvn);

        AddControl(View);
        return Task.CompletedTask;
    }

    public override async Task Action(MessageResult message)
    {
        await message.ConfirmAction();

        if (message.Handled)
        {
            return;
        }

        switch (message.RawData)
        {
            case "back":

                message.Handled = true;

                var start = new Menu();

                await NavigateTo(start);

                break;
        }
    }

    public override async Task Render(MessageResult message)
    {
        var s = "";

        s += "Selected Node: " + (View.SelectedNode?.Text ?? "(null)") + "\r\n";

        s += "Visible Node: " + (View.VisibleNode?.Text ?? "(top)") + "\r\n";

        s += "Visible Path: " + View.GetPath() + "\r\n";
        s += "Selected Path: " + (View.SelectedNode?.GetPath() ?? "(null)") + "\r\n";

        var bf = new ButtonForm();
        bf.AddButtonRow(new ButtonBase("Back", "back"));

        if (MessageId != null)
        {
            await Device.Edit(MessageId.Value, s, bf);
        }
        else
        {
            var m = await Device.Send(s, bf);
            MessageId = m.MessageId;
        }
    }
}