MainWindowEvent.cs

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using Dreamine.MVVM.Interfaces.Navigation;
using SampleCore.ViewModels.PageSub;
using System.Windows;
 
namespace SampleCore.Events
{
    public class MainWindowEvent
    {
        private readonly IViewManager _viewManager;
        public MainWindowEvent(IViewManager viewManager) => _viewManager = viewManager;

        public void Ok() => MessageBox.Show("확인 클릭됨!");
        public void Cancel() => MessageBox.Show("취소 클릭됨!");

        public void SubPage() => _viewManager.Show<PageSubViewModel>();

        public void Minimize()
        {
            var w = GetActiveWindow();
            if (w != null) w.WindowState = WindowState.Minimized;
        }

        public void Maximize()
        {
            var w = GetActiveWindow();
            if (w != null)
            {
                w.WindowState = w.WindowState == WindowState.Maximized
                    ? WindowState.Normal
                    : WindowState.Maximized;
            }
        }

        public void Close()
        {
            GetActiveWindow()?.Close();
        }

        private Window? GetActiveWindow()
        {
            return Application.Current?.Windows.OfType<Window>().FirstOrDefault(w => w.IsActive);
        }
    }
}