teamsiso/src/TeamsISO.App/MainWindow.xaml.cs

using System.Windows;
using System.Windows.Shapes;
using TeamsISO.App.ViewModels;

namespace TeamsISO.App;

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        StateChanged += OnWindowStateChanged;
    }

    public MainWindow(MainViewModel viewModel) : this()
    {
        DataContext = viewModel;
    }

    /// <summary>Custom min button — chrome'd window has no system caption buttons.</summary>
    private void OnMinimize(object sender, RoutedEventArgs e) =>
        WindowState = WindowState.Minimized;

    /// <summary>Toggles maximize/restore. Bound to the maximize button + double-click on the drag region.</summary>
    private void OnMaximizeRestore(object sender, RoutedEventArgs e) =>
        WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;

    /// <summary>Custom close button.</summary>
    private void OnClose(object sender, RoutedEventArgs e) => Close();

    /// <summary>
    /// Swap the maximize-button glyph between the "single rectangle" (when normal) and the
    /// "two-overlapping-rectangles" (when maximized) variants, matching the Windows 11
    /// caption-button conventions.
    /// </summary>
    private void OnWindowStateChanged(object? sender, EventArgs e)
    {
        if (FindName("MaximizeIcon") is not Path icon) return;
        icon.Data = WindowState == WindowState.Maximized
            // Two-rectangle "restore" glyph
            ? System.Windows.Media.Geometry.Parse("M 2,0 L 10,0 L 10,8 M 0,2 L 8,2 L 8,10 L 0,10 Z")
            // Single-rectangle "maximize" glyph
            : System.Windows.Media.Geometry.Parse("M 0,0 L 10,0 L 10,10 L 0,10 Z");
    }
}