public MainForm()
        {
            InitializeComponent();

            // check if the LibreHardwareMonitorLib assembly has the correct version
            if (Assembly.GetAssembly(typeof(Computer)).GetName().Version != Assembly.GetExecutingAssembly().GetName().Version)
            {
                MessageBox.Show("The version of the file LibreHardwareMonitorLib.dll is incompatible.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Environment.Exit(0);
            }

            _settings = new PersistentSettings();
            _settings.Load(Path.ChangeExtension(Application.ExecutablePath, ".config"));

            _unitManager = new UnitManager(_settings);

            // make sure the buffers used for double buffering are not disposed
            // after each draw call
            BufferedGraphicsManager.Current.MaximumBuffer = Screen.PrimaryScreen.Bounds.Size;

            // set the DockStyle here, to avoid conflicts with the MainMenu
            splitContainer.Dock = DockStyle.Fill;

            Font          = SystemFonts.MessageBoxFont;
            treeView.Font = SystemFonts.MessageBoxFont;

            // Set the bounds immediately, so that our child components can be
            // properly placed.
            Bounds = new Rectangle
            {
                X      = _settings.GetValue("mainForm.Location.X", Location.X),
                Y      = _settings.GetValue("mainForm.Location.Y", Location.Y),
                Width  = _settings.GetValue("mainForm.Width", 470),
                Height = _settings.GetValue("mainForm.Height", 640)
            };

            _plotPanel = new PlotPanel(_settings, _unitManager)
            {
                Font = SystemFonts.MessageBoxFont, Dock = DockStyle.Fill
            };

            nodeCheckBox.IsVisibleValueNeeded += NodeCheckBox_IsVisibleValueNeeded;
            nodeTextBoxText.DrawText          += NodeTextBoxText_DrawText;
            nodeTextBoxValue.DrawText         += NodeTextBoxText_DrawText;
            nodeTextBoxMin.DrawText           += NodeTextBoxText_DrawText;
            nodeTextBoxMax.DrawText           += NodeTextBoxText_DrawText;
            nodeTextBoxText.EditorShowing     += NodeTextBoxText_EditorShowing;

            foreach (TreeColumn column in treeView.Columns)
            {
                column.Width = Math.Max(20, Math.Min(400, _settings.GetValue("treeView.Columns." + column.Header + ".Width", column.Width)));
            }

            TreeModel treeModel = new TreeModel();

            _root = new Node(Environment.MachineName)
            {
                Image = EmbeddedResources.GetImage("computer.png")
            };

            treeModel.Nodes.Add(_root);
            treeView.Model = treeModel;

            _computer = new Computer(_settings);

            _systemTray = new SystemTray(_computer, _settings, _unitManager);
            _systemTray.HideShowCommand += HideShowClick;
            _systemTray.ExitCommand     += ExitClick;

            int p = (int)Environment.OSVersion.Platform;

            if ((p == 4) || (p == 128))
            { // Unix
                treeView.RowHeight           = Math.Max(treeView.RowHeight, 18);
                splitContainer.BorderStyle   = BorderStyle.None;
                splitContainer.Border3DStyle = Border3DStyle.Adjust;
                splitContainer.SplitterWidth = 4;
                treeView.BorderStyle         = BorderStyle.Fixed3D;
                _plotPanel.BorderStyle       = BorderStyle.Fixed3D;
                gadgetMenuItem.Visible       = false;
                minCloseMenuItem.Visible     = false;
                minTrayMenuItem.Visible      = false;
                startMinMenuItem.Visible     = false;
            }
            else
            { // Windows
                treeView.RowHeight       = Math.Max(treeView.Font.Height + 1, 18);
                _gadget                  = new SensorGadget(_computer, _settings, _unitManager);
                _gadget.HideShowCommand += HideShowClick;
                _wmiProvider             = new WmiProvider(_computer);
            }

            _logger = new Logger(_computer);

            _plotColorPalette     = new Color[13];
            _plotColorPalette[0]  = Color.Blue;
            _plotColorPalette[1]  = Color.OrangeRed;
            _plotColorPalette[2]  = Color.Green;
            _plotColorPalette[3]  = Color.LightSeaGreen;
            _plotColorPalette[4]  = Color.Goldenrod;
            _plotColorPalette[5]  = Color.DarkViolet;
            _plotColorPalette[6]  = Color.YellowGreen;
            _plotColorPalette[7]  = Color.SaddleBrown;
            _plotColorPalette[8]  = Color.RoyalBlue;
            _plotColorPalette[9]  = Color.DeepPink;
            _plotColorPalette[10] = Color.MediumSeaGreen;
            _plotColorPalette[11] = Color.Olive;
            _plotColorPalette[12] = Color.Firebrick;

            _computer.HardwareAdded   += HardwareAdded;
            _computer.HardwareRemoved += HardwareRemoved;
            _computer.Open();

            timer.Enabled = true;

            UserOption showHiddenSensors = new UserOption("hiddenMenuItem", false, hiddenMenuItem, _settings);

            showHiddenSensors.Changed += delegate
            {
                treeModel.ForceVisible = showHiddenSensors.Value;
            };

            UserOption showValue = new UserOption("valueMenuItem", true, valueMenuItem, _settings);

            showValue.Changed += delegate
            {
                treeView.Columns[1].IsVisible = showValue.Value;
            };

            UserOption showMin = new UserOption("minMenuItem", false, minMenuItem, _settings);

            showMin.Changed += delegate
            {
                treeView.Columns[2].IsVisible = showMin.Value;
            };

            UserOption showMax = new UserOption("maxMenuItem", true, maxMenuItem, _settings);

            showMax.Changed += delegate
            {
                treeView.Columns[3].IsVisible = showMax.Value;
            };

            var _ = new UserOption("startMinMenuItem", false, startMinMenuItem, _settings);

            _minimizeToTray          = new UserOption("minTrayMenuItem", true, minTrayMenuItem, _settings);
            _minimizeToTray.Changed += delegate
            {
                _systemTray.IsMainIconEnabled = _minimizeToTray.Value;
            };

            _minimizeOnClose = new UserOption("minCloseMenuItem", false, minCloseMenuItem, _settings);

            _autoStart          = new UserOption(null, _startupManager.Startup, startupMenuItem, _settings);
            _autoStart.Changed += delegate
            {
                try
                {
                    _startupManager.Startup = _autoStart.Value;
                }
                catch (InvalidOperationException)
                {
                    MessageBox.Show("Updating the auto-startup option failed.", "Error",
                                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                    _autoStart.Value = _startupManager.Startup;
                }
            };

            _readMainboardSensors          = new UserOption("mainboardMenuItem", true, mainboardMenuItem, _settings);
            _readMainboardSensors.Changed += delegate
            {
                _computer.IsMotherboardEnabled = _readMainboardSensors.Value;
            };

            _readCpuSensors          = new UserOption("cpuMenuItem", true, cpuMenuItem, _settings);
            _readCpuSensors.Changed += delegate
            {
                _computer.IsCpuEnabled = _readCpuSensors.Value;
            };

            _readRamSensors          = new UserOption("ramMenuItem", true, ramMenuItem, _settings);
            _readRamSensors.Changed += delegate
            {
                _computer.IsMemoryEnabled = _readRamSensors.Value;
            };

            _readGpuSensors          = new UserOption("gpuMenuItem", true, gpuMenuItem, _settings);
            _readGpuSensors.Changed += delegate
            {
                _computer.IsGpuEnabled = _readGpuSensors.Value;
            };

            _readFanControllersSensors          = new UserOption("fanControllerMenuItem", true, fanControllerMenuItem, _settings);
            _readFanControllersSensors.Changed += delegate
            {
                _computer.IsControllerEnabled = _readFanControllersSensors.Value;
            };

            _readHddSensors          = new UserOption("hddMenuItem", true, hddMenuItem, _settings);
            _readHddSensors.Changed += delegate
            {
                _computer.IsStorageEnabled = _readHddSensors.Value;
            };

            _readNicSensors          = new UserOption("nicMenuItem", true, nicMenuItem, _settings);
            _readNicSensors.Changed += delegate
            {
                _computer.IsNetworkEnabled = _readNicSensors.Value;
            };

            _showGadget          = new UserOption("gadgetMenuItem", false, gadgetMenuItem, _settings);
            _showGadget.Changed += delegate
            {
                if (_gadget != null)
                {
                    _gadget.Visible = _showGadget.Value;
                }
            };

            celsiusMenuItem.Checked    = _unitManager.TemperatureUnit == TemperatureUnit.Celsius;
            fahrenheitMenuItem.Checked = !celsiusMenuItem.Checked;

            Server = new HttpServer(_root, _settings.GetValue("listenerPort", 8085));
            if (Server.PlatformNotSupported)
            {
                webMenuItemSeparator.Visible = false;
                webMenuItem.Visible          = false;
            }

            _runWebServer          = new UserOption("runWebServerMenuItem", false, runWebServerMenuItem, _settings);
            _runWebServer.Changed += delegate
            {
                if (_runWebServer.Value)
                {
                    Server.StartHttpListener();
                }
                else
                {
                    Server.StopHttpListener();
                }
            };

            _logSensors = new UserOption("logSensorsMenuItem", false, logSensorsMenuItem, _settings);

            _loggingInterval = new UserRadioGroup("loggingInterval", 0,
                                                  new[] { log1sMenuItem, log2sMenuItem, log5sMenuItem, log10sMenuItem,
                                                          log30sMenuItem, log1minMenuItem, log2minMenuItem, log5minMenuItem,
                                                          log10minMenuItem, log30minMenuItem, log1hMenuItem, log2hMenuItem,
                                                          log6hMenuItem }, _settings);
            _loggingInterval.Changed += (sender, e) =>
            {
                switch (_loggingInterval.Value)
                {
                case 0: _logger.LoggingInterval = new TimeSpan(0, 0, 1); break;

                case 1: _logger.LoggingInterval = new TimeSpan(0, 0, 2); break;

                case 2: _logger.LoggingInterval = new TimeSpan(0, 0, 5); break;

                case 3: _logger.LoggingInterval = new TimeSpan(0, 0, 10); break;

                case 4: _logger.LoggingInterval = new TimeSpan(0, 0, 30); break;

                case 5: _logger.LoggingInterval = new TimeSpan(0, 1, 0); break;

                case 6: _logger.LoggingInterval = new TimeSpan(0, 2, 0); break;

                case 7: _logger.LoggingInterval = new TimeSpan(0, 5, 0); break;

                case 8: _logger.LoggingInterval = new TimeSpan(0, 10, 0); break;

                case 9: _logger.LoggingInterval = new TimeSpan(0, 30, 0); break;

                case 10: _logger.LoggingInterval = new TimeSpan(1, 0, 0); break;

                case 11: _logger.LoggingInterval = new TimeSpan(2, 0, 0); break;

                case 12: _logger.LoggingInterval = new TimeSpan(6, 0, 0); break;
                }
            };

            _sensorValuesTimeWindow = new UserRadioGroup("sensorValuesTimeWindow", 10,
                                                         new[] { timeWindow30sMenuItem, timeWindow1minMenuItem, timeWindow2minMenuItem,
                                                                 timeWindow5minMenuItem, timeWindow10minMenuItem, timeWindow30minMenuItem,
                                                                 timeWindow1hMenuItem, timeWindow2hMenuItem, timeWindow6hMenuItem,
                                                                 timeWindow12hMenuItem, timeWindow24hMenuItem }, _settings);
            _sensorValuesTimeWindow.Changed += (sender, e) =>
            {
                TimeSpan timeWindow = TimeSpan.Zero;
                switch (_sensorValuesTimeWindow.Value)
                {
                case 0: timeWindow = new TimeSpan(0, 0, 30); break;

                case 1: timeWindow = new TimeSpan(0, 1, 0); break;

                case 2: timeWindow = new TimeSpan(0, 2, 0); break;

                case 3: timeWindow = new TimeSpan(0, 5, 0); break;

                case 4: timeWindow = new TimeSpan(0, 10, 0); break;

                case 5: timeWindow = new TimeSpan(0, 30, 0); break;

                case 6: timeWindow = new TimeSpan(1, 0, 0); break;

                case 7: timeWindow = new TimeSpan(2, 0, 0); break;

                case 8: timeWindow = new TimeSpan(6, 0, 0); break;

                case 9: timeWindow = new TimeSpan(12, 0, 0); break;

                case 10: timeWindow = new TimeSpan(24, 0, 0); break;
                }

                _computer.Accept(new SensorVisitor(delegate(ISensor sensor)
                {
                    sensor.ValuesTimeWindow = timeWindow;
                }));
            };

            InitializePlotForm();
            InitializeSplitter();

            startupMenuItem.Visible = _startupManager.IsAvailable;

            if (startMinMenuItem.Checked)
            {
                if (!minTrayMenuItem.Checked)
                {
                    WindowState = FormWindowState.Minimized;
                    Show();
                }
            }
            else
            {
                Show();
            }

            // Create a handle, otherwise calling Close() does not fire FormClosed

            // Make sure the settings are saved when the user logs off
            Microsoft.Win32.SystemEvents.SessionEnded += delegate
            {
                _computer.Close();
                SaveConfiguration();
                if (_runWebServer.Value)
                {
                    Server.Quit();
                }
            };
        }
        private void InitializePlotForm()
        {
            _plotForm = new Form {
                FormBorderStyle = FormBorderStyle.SizableToolWindow, ShowInTaskbar = false, StartPosition = FormStartPosition.Manual
            };
            AddOwnedForm(_plotForm);
            _plotForm.Bounds = new Rectangle
            {
                X      = _settings.GetValue("plotForm.Location.X", -100000),
                Y      = _settings.GetValue("plotForm.Location.Y", 100),
                Width  = _settings.GetValue("plotForm.Width", 600),
                Height = _settings.GetValue("plotForm.Height", 400)
            };

            _showPlot     = new UserOption("plotMenuItem", false, plotMenuItem, _settings);
            _plotLocation = new UserRadioGroup("plotLocation", 0, new[] { plotWindowMenuItem, plotBottomMenuItem, plotRightMenuItem }, _settings);

            _showPlot.Changed += delegate
            {
                if (_plotLocation.Value == 0)
                {
                    if (_showPlot.Value && Visible)
                    {
                        _plotForm.Show();
                    }
                    else
                    {
                        _plotForm.Hide();
                    }
                }
                else
                {
                    splitContainer.Panel2Collapsed = !_showPlot.Value;
                }
                treeView.Invalidate();
            };
            _plotLocation.Changed += delegate
            {
                switch (_plotLocation.Value)
                {
                case 0:
                    splitContainer.Panel2.Controls.Clear();
                    splitContainer.Panel2Collapsed = true;
                    _plotForm.Controls.Add(_plotPanel);
                    if (_showPlot.Value && Visible)
                    {
                        _plotForm.Show();
                    }
                    break;

                case 1:
                    _plotForm.Controls.Clear();
                    _plotForm.Hide();
                    splitContainer.Orientation = Orientation.Horizontal;
                    splitContainer.Panel2.Controls.Add(_plotPanel);
                    splitContainer.Panel2Collapsed = !_showPlot.Value;
                    break;

                case 2:
                    _plotForm.Controls.Clear();
                    _plotForm.Hide();
                    splitContainer.Orientation = Orientation.Vertical;
                    splitContainer.Panel2.Controls.Add(_plotPanel);
                    splitContainer.Panel2Collapsed = !_showPlot.Value;
                    break;
                }
            };

            _plotForm.FormClosing += delegate(object sender, FormClosingEventArgs e)
            {
                if (e.CloseReason == CloseReason.UserClosing)
                {
                    // just switch off the plotting when the user closes the form
                    if (_plotLocation.Value == 0)
                    {
                        _showPlot.Value = false;
                    }
                    e.Cancel = true;
                }
            };


            void MoveOrResizePlotForm(object sender, EventArgs e)
            {
                if (_plotForm.WindowState != FormWindowState.Minimized)
                {
                    _settings.SetValue("plotForm.Location.X", _plotForm.Bounds.X);
                    _settings.SetValue("plotForm.Location.Y", _plotForm.Bounds.Y);
                    _settings.SetValue("plotForm.Width", _plotForm.Bounds.Width);
                    _settings.SetValue("plotForm.Height", _plotForm.Bounds.Height);
                }
            }

            _plotForm.Move   += MoveOrResizePlotForm;
            _plotForm.Resize += MoveOrResizePlotForm;

            _plotForm.VisibleChanged += delegate
            {
                Rectangle bounds       = new Rectangle(_plotForm.Location, _plotForm.Size);
                Screen    screen       = Screen.FromRectangle(bounds);
                Rectangle intersection = Rectangle.Intersect(screen.WorkingArea, bounds);
                if (intersection.Width < Math.Min(16, bounds.Width) ||
                    intersection.Height < Math.Min(16, bounds.Height))
                {
                    _plotForm.Location = new Point(
                        screen.WorkingArea.Width / 2 - bounds.Width / 2,
                        screen.WorkingArea.Height / 2 - bounds.Height / 2);
                }
            };

            VisibleChanged += delegate
            {
                if (Visible && _showPlot.Value && _plotLocation.Value == 0)
                {
                    _plotForm.Show();
                }
                else
                {
                    _plotForm.Hide();
                }
            };
        }