gui-cs.Terminal.Gui/Examples/UICatalog/Scenarios/ListsAndCombos.cs

using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;

namespace UICatalog.Scenarios;

[ScenarioMetadata ("ListView & ComboBox", "Demonstrates a ListView populating a ComboBox that acts as a filter.")]
[ScenarioCategory ("Controls")]
[ScenarioCategory ("ListView")]
[ScenarioCategory ("ComboBox")]
public class ListsAndCombos : Scenario
{
    public override void Main ()
    {
        Application.Init ();
        //TODO: Duplicated code in Demo.cs Consider moving to shared assembly
        ObservableCollection<string> items = [];

        foreach (string dir in new [] { "/etc", @$"{Environment.GetEnvironmentVariable ("SystemRoot")}\System32" })
        {
            if (Directory.Exists (dir))
            {
                items = new (Directory.GetFiles (dir)
                                      .Union (Directory.GetDirectories (dir))
                                      .Select (Path.GetFileName)
                                      .Where (x => char.IsLetterOrDigit (x [0]))
                                      .OrderBy (x => x)
                                      .Select (x => x)
                                      .ToList ());
            }
        }

        var win = new Window { Title = GetQuitKeyAndName () };
        // ListView
        var lbListView = new Label
        {
            SchemeName = "Runnable",
            X = 0,

            Width = Dim.Percent (40),
            Text = "Listview"
        };

        var listview = new ListView
        {
            X = 0,
            Y = Pos.Bottom (lbListView) + 2,
            Height = Dim.Fill (2),
            Width = Dim.Percent (40),
            Source = new ListWrapper<string> (items)
        };
        listview.SelectedItemChanged += (s, e) => lbListView.Text = items [listview.SelectedItem.Value];
        win.Add (lbListView, listview);

        //var scrollBar = new ScrollBarView (listview, true);

        //scrollBar.ChangedPosition += (s, e) =>
        //                             {
        //                                 listview.TopItem = scrollBar.Position;

        //                                 if (listview.TopItem != scrollBar.Position)
        //                                 {
        //                                     scrollBar.Position = listview.TopItem;
        //                                 }

        //                                 listview.SetNeedsDraw ();
        //                             };

        //scrollBar.OtherScrollBarView.ChangedPosition += (s, e) =>
        //                                                {
        //                                                    listview.LeftItem = scrollBar.OtherScrollBarView.Position;

        //                                                    if (listview.LeftItem != scrollBar.OtherScrollBarView.Position)
        //                                                    {
        //                                                        scrollBar.OtherScrollBarView.Position = listview.LeftItem;
        //                                                    }

        //                                                    listview.SetNeedsDraw ();
        //                                                };

        //listview.DrawingContent += (s, e) =>
        //                        {
        //                            scrollBar.Size = listview.Source.Count - 1;
        //                            scrollBar.Position = listview.TopItem;
        //                            scrollBar.OtherScrollBarView.Size = listview.MaxLength - 1;
        //                            scrollBar.OtherScrollBarView.Position = listview.LeftItem;
        //                            scrollBar.Refresh ();
        //                        };

        // ComboBox
        var lbComboBox = new Label
        {
            SchemeName = "Runnable",
            X = Pos.Right (lbListView) + 1,

            Width = Dim.Percent (40),
            Text = "ComboBox"
        };

        var comboBox = new ComboBox
        {
            X = Pos.Right (listview) + 1,
            Y = Pos.Bottom (lbListView) + 1,
            Height = Dim.Fill (2),
            Width = Dim.Percent (40)
        };
        comboBox.SetSource (items);

        comboBox.SelectedItemChanged += (s, text) => lbComboBox.Text = text.Value.ToString ();
        win.Add (lbComboBox, comboBox);

        //var scrollBarCbx = new ScrollBarView (comboBox.SubViews.ElementAt (1), true);

        //scrollBarCbx.ChangedPosition += (s, e) =>
        //                                {
        //                                    ((ListView)comboBox.SubViews.ElementAt (1)).TopItem = scrollBarCbx.Position;

        //                                    if (((ListView)comboBox.SubViews.ElementAt (1)).TopItem != scrollBarCbx.Position)
        //                                    {
        //                                        scrollBarCbx.Position = ((ListView)comboBox.SubViews.ElementAt (1)).TopItem;
        //                                    }

        //                                    comboBox.SetNeedsDraw ();
        //                                };

        //scrollBarCbx.OtherScrollBarView.ChangedPosition += (s, e) =>
        //                                                   {
        //                                                       ((ListView)comboBox.SubViews.ElementAt (1)).LeftItem = scrollBarCbx.OtherScrollBarView.Position;

        //                                                       if (((ListView)comboBox.SubViews.ElementAt (1)).LeftItem != scrollBarCbx.OtherScrollBarView.Position)
        //                                                       {
        //                                                           scrollBarCbx.OtherScrollBarView.Position = ((ListView)comboBox.SubViews.ElementAt (1)).LeftItem;
        //                                                       }

        //                                                       comboBox.SetNeedsDraw ();
        //                                                   };

        //comboBox.DrawingContent += (s, e) =>
        //                        {
        //                            scrollBarCbx.Size = comboBox.Source.Count;
        //                            scrollBarCbx.Position = ((ListView)comboBox.SubViews.ElementAt (1)).TopItem;
        //                            scrollBarCbx.OtherScrollBarView.Size = ((ListView)comboBox.SubViews.ElementAt (1)).MaxLength - 1;
        //                            scrollBarCbx.OtherScrollBarView.Position = ((ListView)comboBox.SubViews.ElementAt (1)).LeftItem;
        //                            scrollBarCbx.Refresh ();
        //                        };

        var btnMoveUp = new Button { X = 1, Y = Pos.Bottom (lbListView), Text = "Move _Up" };
        btnMoveUp.Accepting += (s, e) => { listview.MoveUp (); };

        var btnMoveDown = new Button
        {
            X = Pos.Right (btnMoveUp) + 1, Y = Pos.Bottom (lbListView), Text = "Move _Down"
        };
        btnMoveDown.Accepting += (s, e) => { listview.MoveDown (); };

        win.Add (btnMoveUp, btnMoveDown);

        Application.Run (win);
        win.Dispose ();
        Application.Shutdown ();
    }
}