VAR.DatabaseExplorer/VAR.DatabaseExplorer/UI/FrmMain.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using VAR.DatabaseExplorer.Controls;

namespace VAR.DatabaseExplorer.UI
{
    public partial class FrmMain : Form
    {
        #region Declarations

        private static FrmMain _currentInstance;

        #endregion Declarations

        #region Creator

        public FrmMain()
        {
            _currentInstance = this;
            InitializeComponent();
        }

        #endregion Creator

        #region WindowList

        private List<Form> listChilds = new List<Form>();

        public static void AddForm(Form frm)
        {
            frm.MdiParent = _currentInstance;
            frm.WindowState = FormWindowState.Maximized;
            frm.Show();
            _currentInstance.listChilds.Add(frm);
            frm.FormClosed += _currentInstance.FrmPrincipal_OnChildClose;
            _currentInstance.RefreshWindowButtons();
        }

        protected void FrmPrincipal_OnChildClose(object sender, FormClosedEventArgs e)
        {
            listChilds.Remove((Form)sender);
            RefreshWindowButtons();
        }

        private void FrmPrincipal_MdiChildActivate(object sender, EventArgs e)
        {
            RefreshWindowButtons();
        }

        private void RefreshWindowButtons()
        {
            int childCount = listChilds.Count;
            int delta = childCount - flowpnlWindows.Controls.Count;
            if (delta < 0)
            {
                int dest = flowpnlWindows.Controls.Count + delta;
                for (int i = flowpnlWindows.Controls.Count - 1; i >= dest; i--)
                {
                    flowpnlWindows.Controls.RemoveAt(i);
                }
            }
            else if (delta > 0)
            {
                for (int i = 0; i < delta; i++)
                {
                    flowpnlWindows.Controls.Add(new WindowButton());
                }
            }
            for (int i = 0; i < childCount; i++)
            {
                WindowButton btn = (WindowButton)flowpnlWindows.Controls[i];
                Form frm = listChilds[i];
                btn.Text = frm.Text;
                btn.Window = frm;
                btn.Active = (frm == ActiveMdiChild);
            }
        }

        #endregion WindowList

        #region Menus

        private void menuSQLServerSearch_Click(object sender, EventArgs e)
        {
            var frm = new FrmSQLServerSearch();
            FrmMain.AddForm(frm);
        }

        private void menuConectionString_Click(object sender, EventArgs e)
        {

        }

        #endregion Menus

    }
}