COP-17/WinFormsProject/WinFormsLibrary/TreeClass.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace WinFormsLibrary
{
    public partial class TreeClass : UserControl
    {
        private List<string> hierarchy;
        public bool hasError = false;

        public TreeClass()
        {
            InitializeComponent();
        }

        public void setHierarchy(List<string> h)
        {
            hierarchy = h;
        }

        private bool hasValue(TreeNodeCollection nodes, string value)
        {
            foreach (TreeNode node in nodes)
            {
                if (node.Text == value) return true;
            }

            return false;
        }

        private bool addData<T>(T t, string propertyName)
        {
            TreeNodeCollection current = treeView.Nodes;

            foreach (string h in hierarchy)
            {
                if (h == propertyName)
                {
                    var field = t.GetType().GetField(h);

                    if (field == null)
                    {
                        return false;
                    }

                    string value = field.GetValue(t).ToString();
                    if (!hasValue(current, value)) current.Add(value);

                    TreeNode elem = null;

                    foreach (TreeNode child in current)
                    {
                        if (child.Text == value)
                        {
                            elem = child;
                            break;
                        }
                    }

                    if (elem != null) current = elem.Nodes;
                }
                else
                {
                    if (!hasValue(current, h)) current.Add(h);

                    TreeNode elem = null;

                    foreach (TreeNode child in current)
                    {
                        if (child.Text == h)
                        {
                            elem = child;
                            break;
                        }
                    }

                    if (elem != null) current = elem.Nodes;
                }
            }

            return true;
        }

        public bool setData<T>(T data, string propertyName)
        {
            bool status = addData<T>(data, propertyName);
            if (!status) return false;

            return true;
        }

        public T GetSelectedClass<T>() where T : new()
        {
            T res = default(T);
            TreeNode node = treeView.SelectedNode;

            if (node.Nodes.Count != 0)
            {
                hasError = true;
                return res;
            }

            for (int i = hierarchy.Count - 1; i >= 0; i--)
            {
                if (node == null)
                {
                    hasError = true;
                    return res;
                }

                var curr = res.GetType().GetField(hierarchy[i]);
                if (curr == null)
                {
                    hasError = true;
                    return res;
                }

                curr.SetValue(res, node.Text);
                node = node.Parent;
            }

            return res;
        }
    }
}