using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DropDownControl_Ex
{
    public partial class Form1 : Form
    {
        DataTable _table;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        
            var groupedItems = new[] {
                new { Group = "Gases", Value = 1, Display = "Helium", ToolTip = "Lighter than air" },
                new { Group = "Gases", Value = 2, Display = "Hydrogen", ToolTip = "Explosive" },
                new { Group = "Gases", Value = 3, Display = "Oxygen", ToolTip = "Vital for animal life" },
                new { Group = "Gases", Value = 4, Display = "Argon", ToolTip = "Inert" },
                new { Group = "Metals", Value = 5, Display = "Iron", ToolTip = "Heavy and metallic" },
                new { Group = "Metals", Value = 6, Display = "Lithium", ToolTip = "Explodes in water" },
                new { Group = "Metals", Value = 7, Display = "Copper", ToolTip = "Good electrical conductor" },
                new { Group = "Metals", Value = 8, Display = "Gold", ToolTip = "Precious metal" },
                new { Group = "Metals", Value = 9, Display = "Silver", ToolTip = "Anti-bacterial" },
                new { Group = "Radioactive", Value = 10, Display = "Uranium", ToolTip = "Used in fission" },
                new { Group = "Radioactive", Value = 11, Display = "Plutonium", ToolTip = "Man-made" },
                new { Group = "Radioactive", Value = 12, Display = "Americium", ToolTip = "Used in smoke detectors" },
                new { Group = "Radioactive", Value = 13, Display = "Radon", ToolTip = "Radioactive gas" }
            };

            gcbEditable.ValueMember = "Value";
            gcbEditable.DisplayMember = "Display";
            gcbEditable.GroupMember = "Group";
            gcbEditable.SortComparer = new DemoComparer();
            gcbEditable.DataSource = new BindingSource(groupedItems, String.Empty);

            Action<ComboTreeNodeCollection> addNodesHelper = nodes => {
                foreach (var grp in groupedItems.GroupBy(x => x.Group))
                {
                    ComboTreeNode parent = nodes.Add(grp.Key);
                    foreach (var item in grp)
                    {
                        ComboTreeNode child = parent.Nodes.Add(item.Display);
                        child.ToolTip = item.ToolTip;
                    }
                }
            };

            Action<ComboTreeBox> addNodes = ctb => {
                addNodesHelper(ctb.Nodes);
                ctb.Sort();
                ctb.SelectedNode = ctb.Nodes[0].Nodes[0];
            };

         
            addNodes(ctbImages);
            addNodes(comboTreeBox1);


            addNodes(ctbCheckboxes);
            ctbCheckboxes.Nodes[0].Nodes[1].Nodes.Add(new ComboTreeNode("Deuterium"));
            ctbCheckboxes.Nodes[0].Nodes[1].Nodes.Add(new ComboTreeNode("Tritium"));
            ctbCheckboxes.CheckedNodes = new ComboTreeNode[] {
                ctbCheckboxes.Nodes[1].Nodes[0],
                ctbCheckboxes.Nodes[1].Nodes[1]
            };



            dsbExternal.BeginUpdate();
            dsbExternal.Nodes.Add("example");
            dsbExternal.Nodes.Add("nodes");
            dsbExternal.Nodes.Add("already");
            dsbExternal.Nodes.Add("in");
            dsbExternal.Nodes.Add("list");
            dsbExternal.EndUpdate();
            dsbExternal.PerformSearch += dsbExternal_PerformSearch;
            dsbExternal.SelectedNode = dsbExternal.Nodes[0];
        }

        [DebuggerHidden]
        void dsbExternal_PerformSearch(object sender, PerformSearchEventArgs e)
        {
            string adoFilter = String.Format("Word LIKE '{0}%'", e.SearchTerm.Replace("'", "''"));
            foreach (DataRow dr in _table.Select(adoFilter))
            {
                e.CancellationToken.ThrowIfCancellationRequested();
                e.Results.Add(new ComboTreeNode(dr.Field<string>(0)));
            }
        }


        protected override void OnShown(EventArgs e)
        {
            base.OnShown(e);

            _table = new DataTable();
            _table.PrimaryKey = new DataColumn[] { _table.Columns.Add("Word") };

            try
            {
                using (StreamReader sr = new StreamReader(File.OpenRead("WordList.txt")))
                {
                    string line;
                    while ((line = sr.ReadLine()) != null)
                    {
                        _table.Rows.Add(line.Trim());
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, ex.GetType().Name, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }


        private class DemoComparer : IComparer
        {

            public int Compare(object x, object y)
            {
                return -Comparer.Default.Compare(x, y);
            }
        }
    }

}