harmonia/Harmonia.WinUI/MainWindow.xaml.cs

using Harmonia.WinUI.Session;
using Microsoft.UI.Windowing;
using Microsoft.UI.Xaml;

namespace Harmonia.WinUI;

public sealed partial class MainWindow : Window
{
    private const string ApplicationTitle = "Harmonia";

    private readonly ISessionService _sessionService;
    private readonly ISessionTracker _sessionTracker;

    private bool _isSaved;

    public MainWindow(ISessionService sessionService, ISessionTracker sessionTracker)
    {
        _sessionService = sessionService;
        _sessionTracker = sessionTracker;

        InitializeComponent();
        InitializeTitleBar();
        InitializeWindowState();
    }

    private void InitializeTitleBar()
    {
        Title = ApplicationTitle;
        ExtendsContentIntoTitleBar = true;
        SetTitleBar(AppTitleBar);
    }

    private void InitializeWindowState()
    {
        if (AppWindow.Presenter is OverlappedPresenter presenter && _sessionService.Session.Window.IsMaximized)
        {
            presenter.Maximize();
        }

        AppWindow.Changed += OnAppWindowChanged;
    }

    private void OnAppWindowChanged(AppWindow sender, AppWindowChangedEventArgs args)
    {
        if (sender.Presenter is not OverlappedPresenter presenter)
            return;

        // Ignore the minimized state so a minimize-then-close doesn't lose the maximized flag.
        if (presenter.State is OverlappedPresenterState.Minimized)
            return;

        _sessionService.Session.Window.IsMaximized = presenter.State == OverlappedPresenterState.Maximized;
    }

    private async void OnMainWindowClosed(object sender, WindowEventArgs args)
    {
        if (_isSaved)
            return;

        args.Handled = true;

        _sessionTracker.Capture();
        await _sessionService.SaveAsync();

        _isSaved = true;
        Close();
    }
}