BetterDiscordApp-v1/WindowsInstaller/BetterDiscordWI/FormMain.cs

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Xml;
using BetterDiscordWI.panels;

namespace BetterDiscordWI
{
    public partial class FormMain : Form
    {

        private readonly IPanel[] _panels = { new Panel0(), new Panel1(), new Panel2() };
        private int _index;

        public String DiscordPath;
        public String Sha;
        public Boolean finished = false;

        public XmlNodeList ResourceList;

        public FormMain()
        {
            InitializeComponent();

            Sha = Utils.GetHash();

            if (Sha.Length < 1)
            {
                MessageBox.Show("Failed to get sha", "Error", MessageBoxButtons.OK);
                Environment.Exit(0);
            }
            
            foreach (IPanel ipanel in _panels)
            {
                panelContainer.Controls.Add((UserControl)ipanel);
                ((UserControl)ipanel).Dock = DockStyle.Fill;
                ((UserControl)ipanel).Hide();
            }
            ((UserControl)_panels[_index]).Show();
            _panels[_index].SetVisible();



            btnCancel.Click += (sender, args) => Close();
            btnNext.Click += (sender, args) => _panels[_index].BtnNext();
            btnBack.Click += (sender, args) => _panels[_index].BtnPrev();
        }

        public void SwitchPanel(int index)
        {
            ((UserControl)_panels[_index]).Hide();
            _index = index;
            ((UserControl)_panels[_index]).Show();
            _panels[_index].SetVisible();
        }

        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            if (!finished)
            {
                DialogResult dr =
                    MessageBox.Show(
                        "Setup is not complete. If you exit now, BetterDiscord will not be installed.\n\nExit Setup?",
                        "Exit Setup?", MessageBoxButtons.YesNo);

                if (dr == DialogResult.No)
                {
                    e.Cancel = true;
                }
            }
        }

        readonly Pen borderPen = new Pen(Color.FromArgb(160,160,160));
        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.FillRectangle(SystemBrushes.Window, new Rectangle(0,0, Width, 50) );
            g.DrawLine(borderPen, 0, 50, Width, 50);
            g.DrawLine(SystemPens.Window, 0, 51, Width, 51);

            g.DrawLine(borderPen, 0, 310, Width, 310);
            g.DrawLine(SystemPens.Window, 0, 311, Width, 311);
            

            base.OnPaint(e);
        }
    }
}