WowUp/WowUp.WPF/ViewModels/MainWindowViewModel.cs

using System.Windows;

namespace WowUp.WPF.ViewModels
{
    public class MainWindowViewModel : BaseViewModel
    {
        private string _title;
        public string Title
        {
            get => _title;
            set { SetProperty(ref _title, value); }
        }

        private Visibility _restoreVisibility;
        public Visibility RestoreVisibility
        {
            get => _restoreVisibility;
            set { SetProperty(ref _restoreVisibility, value); }
        }

        private Visibility _maximizeVisibility;
        public Visibility MaximizeVisibility
        {
            get => _maximizeVisibility;
            set { SetProperty(ref _maximizeVisibility, value); }
        }

        public void SetRestoreMaximizeVisibility(WindowState windowState)
        {
            if (windowState == WindowState.Maximized)
            {
                MaximizeVisibility = Visibility.Collapsed;
                RestoreVisibility = Visibility.Visible;
            }
            else
            {
                MaximizeVisibility = Visibility.Visible;
                RestoreVisibility = Visibility.Collapsed;
            }
        }
    }
}