private void RegisterExitEvent()
{
if (!_eventRegistered)
{
var property = Type.GetType("System.AppDomain").GetRuntimeProperty("CurrentDomain");
var currentDomain = property.GetValue(null);
EventUtilities.RegisterEvent(currentDomain, "ProcessExit", (sender, args) => WriteConfiguration());
_eventRegistered = true;
}
}
private void TrackCollection()
{
if (InternalCollection is INotifyCollectionChanged items)
{
var collection = items;
_itemsChangedHandler = EventUtilities.RegisterEvent <TrackableCollection <TItem>, NotifyCollectionChangedEventHandler, NotifyCollectionChangedEventArgs>(
this,
h => collection.CollectionChanged += h,
h => collection.CollectionChanged -= h,
h => (o, e) => h(o, e),
(subscriber, s, e) => subscriber.OnOriginalCollectionChanged(s, e));
}
}
/// <summary>Removes a back key pressed handler for a given page. </summary>
/// <param name="page">The page. </param>
public void Remove(MtPage page)
{
_handlers.Remove(_handlers.Single(h => h.Item1 == page));
if (_handlers.Count == 0)
{
#if WINDOWS_UAP
SystemNavigationManager.GetForCurrentView().BackRequested -= OnBackKeyPressed;
#else
EventUtilities.DeregisterStaticEvent(_hardwareButtonsType, "BackPressed", _registrationToken);
#endif
_isEventRegistered = false;
}
}
/// <summary>Removes a back key pressed handler for a given page. </summary>
/// <param name="page">The page. </param>
public void Remove(MtPage page)
{
_handlers.Remove(_handlers.Single(h => h.Item1 == page));
if (_handlers.Count == 0)
{
#if WINDOWS_UAP_UNUSED
HardwareButtons.BackPressed -= OnBackKeyPressed;
#else
EventUtilities.DeregisterStaticEvent(_hardwareButtonsType, "BackPressed", _registrationToken);
#endif
_isEventRegistered = false;
}
}
private void RegisterEvent(TItem item)
{
if (_events.ContainsKey(item))
{
return;
}
if (item is INotifyPropertyChanged i)
{
var handler = EventUtilities.RegisterEvent <TrackableCollection <TItem>, PropertyChangedEventHandler, PropertyChangedEventArgs>(
this,
h => i.PropertyChanged += h,
h => i.PropertyChanged -= h,
h => (o, e) => h(o, e),
(subscriber, s, e) => subscriber.OnCollectionItemPropertyChanged(s, e));
_events.Add(item, handler);
}
}
/// <summary>Adds a back key handler for a given page. </summary>
/// <param name="page">The page. </param>
/// <param name="handler">The handler. </param>
public void Add(MtPage page, Func <object, bool> handler)
{
if (!_isEventRegistered)
{
#if WINDOWS_UAP
SystemNavigationManager.GetForCurrentView().BackRequested += OnBackKeyPressed;
#else
if (_hardwareButtonsType == null)
{
_hardwareButtonsType = Type.GetType(
"Windows.Phone.UI.Input.HardwareButtons, " +
"Windows, Version=255.255.255.255, Culture=neutral, " +
"PublicKeyToken=null, ContentType=WindowsRuntime");
}
_registrationToken = EventUtilities.RegisterStaticEvent(_hardwareButtonsType, "BackPressed", OnBackKeyPressed);
#endif
_isEventRegistered = true;
}
_handlers.Insert(0, new Tuple <MtPage, Func <object, bool> >(page, handler));
}
