public AppManager(IActivityMonitor activityMonitor, ISettingsManager manager)
{
monitor = activityMonitor ?? throw new ArgumentNullException(nameof(activityMonitor));
settingsManager = manager ?? throw new ArgumentNullException(nameof(manager));
ActivateCommand = new RelayCommand(() =>
{
monitor.Activate();
OnPropertyChanged(nameof(IsActive));
}, () => !monitor.IsActive);
DeactivateCommand = new RelayCommand(() =>
{
monitor.Deactivate();
OnPropertyChanged(nameof(IsActive));
}, () => monitor.IsActive);
ShowSettingsCommand = new RelayCommand(ShowSettings_Execute, () => !showingSettings);
ExitCommand = new RelayCommand(() => Application.Current.Shutdown());
}