private void RegisterCallerForStateTracking(string caller)
{
var instanceType = TypeDescriptor.GetReflectionType(this);
var propertyInfo = caller != null?instanceType.GetProperty(caller) : null;
var dateTime = DateTime.Now;
var infoString = $"{propertyInfo?.ReflectedType.Name}.{propertyInfo?.Name}";
var key = $"{dateTime.ToLongTimeString()}.{dateTime.Millisecond} {(infoString.Length > 1 ? infoString : $"{dateTime.ToLongTimeString()}.{dateTime.Millisecond} {GetType().ToString()}")}";
if (propertyInfo is null)
{
// in case of Collection.Add the constructor of added class should fire NotifyPropertyChanged
_mementoService.RegisterObject(this);
_mementoHashtable.Add(key, this);
return;
}
var propertyValueType = propertyInfo.GetValue(this);
if (propertyValueType is INotifyCollectionChanged notifyCollectionChanged)
{
// double registration will be checked by MementoService it self
_mementoService.RegisterCollection(notifyCollectionChanged);
key += COLLECTION_INDICATOR;
}
else if (propertyValueType is INotifyPropertyChanged notifyPropertyChanged)
{
// double registration will be checked by MementoService it self
_mementoService.RegisterObject(notifyPropertyChanged);
key += OBJECT_INDICATOR;
}
_mementoHashtable.Add(key, propertyValueType);
}
/// <summary>
/// Initializes a new instance of the <see cref="MainWindowViewModel"/> class.
/// </summary>
public MainWindowViewModel(IUIVisualizerService uiVisualizerService, IMessageService messageService, IMementoService mementoService)
{
_uiVisualizerService = uiVisualizerService;
_messageService = messageService;
_mementoService = mementoService;
Add = new TaskCommand(OnAddExecuteAsync);
Edit = new TaskCommand(OnEditExecuteAsync, OnEditCanExecute);
Remove = new TaskCommand(OnRemoveExecuteAsync, OnRemoveCanExecute);
Undo = new Command(() => _mementoService.Undo(), () => _mementoService.CanUndo);
Redo = new Command(() => _mementoService.Redo(), () => _mementoService.CanRedo);
PersonCollection = new ObservableCollection<Person> {new Person {Gender = Gender.Male, FirstName = "Geert", MiddleName = "van", LastName = "Horrik"}, new Person {Gender = Gender.Male, FirstName = "Fred", MiddleName = "", LastName = "Retteket"}};
_mementoService.RegisterCollection(PersonCollection);
}
/// <summary>
/// Initializes a new instance of the <see cref="MainWindowViewModel"/> class.
/// </summary>
public MainWindowViewModel(IUIVisualizerService uiVisualizerService, IMessageService messageService, IMementoService mementoService)
{
_uiVisualizerService = uiVisualizerService;
_messageService = messageService;
_mementoService = mementoService;
Add = new Command(OnAddExecute);
Edit = new Command(OnEditExecute, OnEditCanExecute);
Remove = new Command(OnRemoveExecute, OnRemoveCanExecute);
Undo = new Command(() => _mementoService.Undo(), () => _mementoService.CanUndo);
Redo = new Command(() => _mementoService.Redo(), () => _mementoService.CanRedo);
PersonCollection = new ObservableCollection <Person> {
new Person {
Gender = Gender.Male, FirstName = "Geert", MiddleName = "van", LastName = "Horrik"
}, new Person {
Gender = Gender.Male, FirstName = "Fred", MiddleName = "", LastName = "Retteket"
}
};
_mementoService.RegisterCollection(PersonCollection);
}
