SettingsForm.cs

using System;
using System.Runtime.InteropServices;
using Eto.Drawing;
using Eto.Forms;

namespace devtime
{
    public class SettingsForm : Dialog<bool>
    {
        private readonly NumericStepper _dbFreqStepper;
        private readonly TextBox _dbPathBox;
        private readonly NumericStepper _dbExportBufStepper;

        private readonly DropDown _stoppedColorDropDown;
        private readonly DropDown _runningColorDropDown;
        private readonly CheckBox _minimizeToTrayCheck;

        private readonly DropDown _startHotkeyDropDown;
        private readonly DropDown _stopHotkeyDropDown;

        private readonly CheckBox _disableGuiUpdatesCheck;
        private readonly CheckBox _freeMemoryCheck;

        public SettingsForm()
        {
            Title = "Settings";
            Icon = IconLoader.LoadIcon("settings.png");
            Resizable = false;
            Maximizable = false;

            // Group 1: Database
            _dbFreqStepper = new NumericStepper { MinValue = 1, MaxValue = 36000, Value = Config.DatabaseUpdateFrequency, DecimalPlaces = 0, Width = 80 };
            _dbPathBox = new TextBox { Text = Config.DatabasePath, Width = 100 };
            _dbExportBufStepper = new NumericStepper { MinValue = 1, MaxValue = 3600, Value = Config.DatabaseExportBufferSize, DecimalPlaces = 0, Width = 80 };

            var dbLayout = new TableLayout
            {
                Spacing = new Size(5, 3),
                Rows =
                {
                    new TableRow(new Label { Text = "Update frequency (s):" }, new TableCell(_dbFreqStepper, false)),
                    new TableRow(new Label { Text = "File path:" }, new TableCell(_dbPathBox, false)),
                    new TableRow(new Label { Text = "Export buffer size:" }, new TableCell(_dbExportBufStepper, false))
                }
            };
            var dbGroup = new GroupBox { Text = "Database", Content = dbLayout };

            // Group 2: Taskbar/Tray
            _stoppedColorDropDown = new DropDown { Width = 100 };
            _runningColorDropDown = new DropDown { Width = 100 };
            foreach (var val in Enum.GetValues(typeof(TaskbarColor)))
            {
                _stoppedColorDropDown.Items.Add(val.ToString() ?? "");
                _runningColorDropDown.Items.Add(val.ToString() ?? "");
            }
            _stoppedColorDropDown.SelectedKey = Config.StoppedTimerColor.ToString();
            _runningColorDropDown.SelectedKey = Config.RunningTimerColor.ToString();

            _minimizeToTrayCheck = new CheckBox { Text = "Minimize to system tray", Checked = Config.MinimizeToTray };

            var isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
            var trayLayout = new TableLayout { Spacing = new Size(5, 3) };
            if (isWindows)
            {
                trayLayout.Rows.Add(new TableRow(new Label { Text = "Normal color:" }, new TableCell(_stoppedColorDropDown, false)));
                trayLayout.Rows.Add(new TableRow(new Label { Text = "Running color:" }, new TableCell(_runningColorDropDown, false)));
            }
            trayLayout.Rows.Add(new TableRow(new TableCell(_minimizeToTrayCheck, false)));
            var trayGroup = new GroupBox { Text = "Taskbar / tray", Content = trayLayout };

            // Group 3: Hotkeys
            _startHotkeyDropDown = new DropDown { Width = 100 };
            _stopHotkeyDropDown = new DropDown { Width = 100 };
            foreach (var val in Enum.GetValues(typeof(Hotkey)))
            {
                _startHotkeyDropDown.Items.Add(val.ToString() ?? "");
                _stopHotkeyDropDown.Items.Add(val.ToString() ?? "");
            }
            _startHotkeyDropDown.SelectedKey = Config.StartHotkey.ToString();
            _stopHotkeyDropDown.SelectedKey = Config.StopHotkey.ToString();

            var hotkeyLayout = new TableLayout
            {
                Spacing = new Size(5, 3),
                Rows =
                {
                    new TableRow(new Label { Text = "Start timer:" }, new TableCell(_startHotkeyDropDown, false)),
                    new TableRow(new Label { Text = "Stop timer:" }, new TableCell(_stopHotkeyDropDown, false))
                }
            };
            var hotkeyGroup = new GroupBox { Text = "Hotkeys", Content = hotkeyLayout };

            // Group 4: Advanced
            _disableGuiUpdatesCheck = new CheckBox { Text = "no GUI updates when not focused", Checked = Config.DisableDynamicGuiUpdates };
            _freeMemoryCheck = new CheckBox { Text = "call the GC when the timer stops", Checked = Config.FreeMemoryWhenStopping };

            var advancedLayout = new StackLayout
            {
                Spacing = 3,
                Items = { _disableGuiUpdatesCheck, _freeMemoryCheck }
            };
            var advancedGroup = new GroupBox { Text = "Avanced", Content = advancedLayout };

            // Grid Layout (2x2)
            var grid = new TableLayout
            {
                Spacing = new Size(5, 5),
                Rows =
                {
                    new TableRow(new TableCell(dbGroup, false), new TableCell(trayGroup, false)),
                    new TableRow(new TableCell(hotkeyGroup, false), new TableCell(advancedGroup, false))
                }
            };

            // Buttons
            var okButton = new Button { Text = "OK", Width = 75, Height = 23 };
            okButton.Click += (s, e) => SaveAndClose();

            var cancelButton = new Button { Text = "Cancel", Width = 75, Height = 23 };
            cancelButton.Click += (s, e) => Close(false);

            DefaultButton = okButton;
            AbortButton = cancelButton;

            var buttonLayout = new StackLayout
            {
                Orientation = Orientation.Horizontal,
                Spacing = 10,
                Items = { okButton, cancelButton }
            };

            Content = new StackLayout
            {
                Padding = new Padding(5),
                Spacing = 5,
                HorizontalContentAlignment = HorizontalAlignment.Stretch,
                Items =
                {
                    grid,
                    new StackLayout { HorizontalContentAlignment = HorizontalAlignment.Right, Items = { buttonLayout } }
                }
            };
        }

        private void SaveAndClose()
        {
            Config.DatabaseUpdateFrequency = (uint)_dbFreqStepper.Value;
            Config.DatabasePath = _dbPathBox.Text.Trim();
            Config.DatabaseExportBufferSize = (uint)_dbExportBufStepper.Value;

            Config.StoppedTimerColor = (TaskbarColor)Enum.Parse(typeof(TaskbarColor), _stoppedColorDropDown.SelectedKey ?? nameof(TaskbarColor.None));
            Config.RunningTimerColor = (TaskbarColor)Enum.Parse(typeof(TaskbarColor), _runningColorDropDown.SelectedKey ?? nameof(TaskbarColor.Green));
            Config.MinimizeToTray = _minimizeToTrayCheck.Checked ?? false;

            Config.StartHotkey = (Hotkey)Enum.Parse(typeof(Hotkey), _startHotkeyDropDown.SelectedKey ?? nameof(Hotkey.None));
            Config.StopHotkey = (Hotkey)Enum.Parse(typeof(Hotkey), _stopHotkeyDropDown.SelectedKey ?? nameof(Hotkey.None));

            Config.DisableDynamicGuiUpdates = _disableGuiUpdatesCheck.Checked ?? false;
            Config.FreeMemoryWhenStopping = _freeMemoryCheck.Checked ?? false;

            Config.Save();
            Close(true);
        }
    }
}