public BindingActionValue([NotNull] object memberSource, [NotNull] IBindingMemberInfo member)
{
Should.NotBeNull(memberSource, nameof(memberSource));
Should.NotBeNull(member, nameof(member));
_memberSource = ToolkitExtensions.GetWeakReference(memberSource);
_member = member;
}
protected virtual IDataBinding CreateBinding([NotNull] IDataContext context, out object target, out IBindingPath targetPath)
{
IBindingSourceAccessor sourceAccessor;
var formatExpression = context.GetData(BindingBuilderConstants.MultiExpression);
var sourceDelegates = context.GetData(BindingBuilderConstants.Sources, true);
if (sourceDelegates.Count > 1 || formatExpression != null)
{
formatExpression = formatExpression ?? FormatMembersExpressionDelegate;
var sources = new IObserver[sourceDelegates.Count];
for (int index = 0; index < sourceDelegates.Count; index++)
{
sources[index] = sourceDelegates[index].Invoke(context);
}
sourceAccessor = new MultiBindingSourceAccessor(sources, formatExpression, context);
}
else
{
sourceAccessor = new BindingSourceAccessor(sourceDelegates[0].Invoke(context), context, false);
}
var binding = new DataBinding(new BindingSourceAccessor(GetBindingTarget(context, out target, out targetPath), context, true), sourceAccessor);
object source;
if (context.TryGetData(BindingBuilderConstants.Source, out source))
{
binding.Context.AddOrUpdate(BindingConstants.Source, ToolkitExtensions.GetWeakReference(source));
}
AddBehaviors(binding, context);
return(binding);
}
public MultiBindingPathMembers(WeakReference observerReference, object penultimateValue, IList <IBindingMemberInfo> members)
{
PenultimateValueRef = ToolkitExtensions.GetWeakReference(penultimateValue);
_observerRef = observerReference;
_members = members;
_lastMember = _members[_members.Count - 1];
}
protected override IBindingPathMembers UpdateInternal(IBindingPathMembers oldPath, bool hasSubscribers)
{
object source = GetActualSource();
if (source == null || source.IsUnsetValue())
{
return(UnsetBindingPathMembers.Instance);
}
var srcRef = OriginalSource as WeakReference;
if (oldPath != null && srcRef != null)
{
var members = oldPath as SingleBindingPathMembers;
if (members != null)
{
if (hasSubscribers)
{
_weakEventListener = TryObserveMember(source, members.LastMember, this, Path.Path);
}
return(members);
}
}
IBindingMemberInfo lastMember = BindingServiceProvider
.MemberProvider
.GetBindingMember(source.GetType(), Path.Path, _ignoreAttachedMembers, true);
if (hasSubscribers || srcRef == null)
{
_weakEventListener = TryObserveMember(source, lastMember, this, Path.Path);
}
return(new SingleBindingPathMembers(srcRef ?? ToolkitExtensions.GetWeakReference(source), Path, lastMember));
}
public void SetViewModel(IViewModel viewModel)
{
WeakReference[] viewModels;
lock (this)
{
if (_viewModelRef != null)
{
return;
}
_viewModelRef = ToolkitExtensions.GetWeakReference(viewModel);
if (_childViewModels == null)
{
return;
}
viewModels = _childViewModels.ToArray();
_childViewModels = null;
}
for (int i = 0; i < viewModels.Length; i++)
{
var childVm = (IViewModel)viewModels[i].Target;
if (childVm != null && !childVm.IsDisposed)
{
OnParentUpdated(childVm, viewModel);
}
}
}
public void Unsubscribe(bool dispose, bool oneTime)
{
if (_subscriber == null)
{
return;
}
if (dispose && oneTime && GetReferenceValue() is ICommand)
{
var penultimateValue = GetPenultimateValue();
if (!penultimateValue.IsNullOrUnsetValue())
{
LastContext = LastContext == null ? new DataContext() : new DataContext(LastContext);
LastContext.Remove(BindingConstants.Binding);
_source = ToolkitExtensions.GetWeakReference(penultimateValue);
return;
}
}
LastContext = null;
//it's normal here.
lock (this)
{
UnsubscribeEventHandler();
UnsubscribeCommand();
_valueReference = null;
}
if (dispose)
{
_canExecuteHandler = null;
}
}
public WeakEventHandler(TTarget target, Action <TTarget, object, TArg> invokeAction, Delegate unsubscribeAction)
{
Should.NotBeNull(target, nameof(target));
Should.NotBeNull(invokeAction, nameof(invokeAction));
_invokeAction = invokeAction;
_unsubscribeAction = unsubscribeAction;
_targetReference = ToolkitExtensions.GetWeakReference(target);
}
public WeakActionSubscriber(object target, MethodInfo method)
{
Should.NotBeNull(target, nameof(target));
Should.NotBeNull(method, nameof(method));
_reference = ToolkitExtensions.GetWeakReference(target);
_method = method;
_delegate = (Action <object, object, T>)ToolkitServiceProvider
.ReflectionManager
.GetMethodDelegate(typeof(Action <object, object, T>), method);
_hash = ActionSubscriber <object> .ActionSubscriberGetHashCode(target, method);
}
public WeakEventListenerWrapper(IEventListener listener)
{
if (listener.IsWeak)
{
_item = listener;
}
else
{
_item = ToolkitExtensions.GetWeakReference(listener);
}
}
public static void AddOrientationChangeListener([NotNull] IOrientationChangeListener listener)
{
Should.NotBeNull(listener, "listener");
lock (OrientationChangeListeners)
{
if (!_hasOrientationChangeSubscriber)
{
UIApplication.Notifications.ObserveDidChangeStatusBarOrientation(DidChangeStatusBarOrientation);
_hasOrientationChangeSubscriber = true;
}
OrientationChangeListeners.Add(ToolkitExtensions.GetWeakReference(listener));
}
}
protected override IBindingPathMembers UpdateInternal(IBindingPathMembers oldPath, bool hasSubscribers)
{
object source = GetActualSource();
if (source.IsNullOrUnsetValue())
{
return(UnsetBindingPathMembers.Instance);
}
var members = oldPath as SingleBindingPathMembers;
var srcRef = OriginalSource as WeakReference;
if (members != null)
{
if (srcRef != null || ReferenceEquals(members.Source, source))
{
if (hasSubscribers && _observable && _weakEventListener == null)
{
_weakEventListener = TryObserveMember(source, members.LastMember, this, Path.Path);
}
return(members);
}
if (_hasStablePath)
{
members.Reference = ToolkitExtensions.GetWeakReference(source);
if (hasSubscribers && _observable)
{
_weakEventListener?.Dispose();
_weakEventListener = TryObserveMember(source, members.LastMember, this, Path.Path);
}
return(members);
}
}
IBindingMemberInfo lastMember = GetBindingMember(source.GetType(), Path.Path, _ignoreAttachedMembers, _optional);
if (lastMember == null)
{
return(UnsetBindingPathMembers.Instance);
}
if (_observable && hasSubscribers)
{
_weakEventListener?.Dispose();
_weakEventListener = TryObserveMember(source, lastMember, this, Path.Path);
}
return(new SingleBindingPathMembers(srcRef ?? ToolkitExtensions.GetWeakReference(source), Path, lastMember));
}
public MultiViewModel()
{
var collection = new SynchronizedNotifiableCollection <TViewModel>();
var list = ServiceProvider.TryDecorate(this, collection);
Should.BeOfType <INotifiableCollection <TViewModel> >(list, "DecoratedItemsSource");
_itemsSource = (INotifiableCollection <TViewModel>)list;
collection.AfterCollectionChanged = OnViewModelsChanged;
_propertyChangedWeakEventHandler = ReflectionExtensions.MakeWeakPropertyChangedHandler(this, (model, o, arg3) => model.OnItemPropertyChanged(o, arg3));
var weakReference = ToolkitExtensions.GetWeakReference(this);
_closeViewModelWeakHandler = (dispatcher, vm, arg3) =>
{
var self = (MultiViewModel <TViewModel>)weakReference.Target;
return(self?.CloseViewModel(dispatcher, vm, arg3) ?? Empty.FalseTask);
};
DisposeViewModelOnRemove = ApplicationSettings.MultiViewModelDisposeViewModelOnRemove;
CloseViewModelsOnClose = ApplicationSettings.MultiViewModelCloseViewModelsOnClose;
}
public void AddChildViewModel(IViewModel viewModel)
{
lock (this)
{
if (_viewModelRef == null)
{
if (_childViewModels == null)
{
_childViewModels = new List <WeakReference>();
}
_childViewModels.Add(ToolkitExtensions.GetWeakReference(viewModel));
return;
}
}
var target = (IViewModel)_viewModelRef.Target;
if (target != null)
{
OnParentUpdated(viewModel, target);
}
}
private void SetValue(object value)
{
_value = _isWeak ? ToolkitExtensions.GetWeakReference(value) : value;
}
public WeakEventListener(IEventListener listener)
{
_listenerRef = ToolkitExtensions.GetWeakReference(listener);
}
private static void InitializeParentViewModel(IViewModel viewModel, IViewModel parentViewModel, IDataContext context)
{
if (parentViewModel == null)
{
return;
}
ObservationMode observationMode;
if (!context.TryGetData(InitializationConstants.ObservationMode, out observationMode))
{
observationMode = ApplicationSettings.ViewModelObservationMode;
}
viewModel.Settings.Metadata.AddOrUpdate(ViewModelConstants.ParentViewModel, ToolkitExtensions.GetWeakReference(parentViewModel));
if (observationMode.HasFlagEx(ObservationMode.ParentObserveChild))
{
viewModel.Subscribe(parentViewModel);
}
if (observationMode.HasFlagEx(ObservationMode.ChildObserveParent))
{
parentViewModel.Subscribe(viewModel);
}
}
/// <summary>
/// Updates the current values.
/// </summary>
protected override void UpdateInternal()
{
try
{
if (_weakEventListener != null)
{
_weakEventListener.Dispose();
}
object source = GetActualSource();
if (source == null || source.IsUnsetValue())
{
_pathMembers = UnsetBindingPathMembers.Instance;
}
else
{
IBindingMemberInfo lastMember = BindingServiceProvider
.MemberProvider
.GetBindingMember(source.GetType(), Path.Path, _ignoreAttachedMembers, true);
_pathMembers = new SingleBindingPathMembers(OriginalSource as WeakReference ?? ToolkitExtensions.GetWeakReference(source), Path, lastMember);
_weakEventListener = TryObserveMember(source, lastMember, this, Path.Path);
}
}
catch (Exception)
{
_pathMembers = UnsetBindingPathMembers.Instance;
throw;
}
}
private static WeakReference GetWeakReference(object target)
{
return(target as WeakReference ?? ToolkitExtensions.GetWeakReference(target));
}
protected virtual IEventListener CreateSourceListener()
{
return(new DefaultListener(ToolkitExtensions.GetWeakReference(this)));
}
public bool AddNotifier(object item)
{
Should.NotBeNull(item, nameof(item));
if (!HasCanExecuteImpl)
{
return(false);
}
lock (_notifiers)
{
if (Contains(item, false))
{
return(true);
}
Action <RelayCommandBase, object> notifier = CreateNotifier(item);
if (notifier == null)
{
return(false);
}
_notifiers.Add(new KeyValuePair <WeakReference, Action <RelayCommandBase, object> >(ToolkitExtensions.GetWeakReference(item), notifier));
return(true);
}
}
protected override IBindingPathMembers UpdateInternal(IBindingPathMembers oldPath, bool hasSubscribers)
{
object source = GetActualSource();
if (source.IsNullOrUnsetValue())
{
return(UnsetBindingPathMembers.Instance);
}
ClearListeners();
int lastIndex;
if (_hasStablePath)
{
var pathMembers = oldPath as MultiBindingPathMembers;
if (pathMembers != null)
{
var list = pathMembers.Members;
lastIndex = list.Count - 1;
for (int index = 0; index < list.Count; index++)
{
var pathMember = list[index];
if (_observable)
{
var observer = TryObserveMember(source, pathMember, index == lastIndex);
if (observer != null)
{
_listeners.Add(observer);
}
}
if (index == lastIndex)
{
break;
}
source = pathMember.GetValue(source, null);
if (source.IsNullOrUnsetValue())
{
if (Path.IsDebuggable)
{
DebugInfo($"Value is not available for '{pathMember.Path}'", new[] { GetActualSource(false) });
}
return(UnsetBindingPathMembers.Instance);
}
}
pathMembers.PenultimateValueRef = ToolkitExtensions.GetWeakReference(source);
return(pathMembers);
}
}
IList <string> items = Path.Parts;
lastIndex = items.Count - 1;
var members = new List <IBindingMemberInfo>();
for (int index = 0; index < items.Count; index++)
{
IBindingMemberInfo pathMember = GetBindingMember(source.GetType(), items[index], _ignoreAttachedMembers, _optional);
if (pathMember == null)
{
return(UnsetBindingPathMembers.Instance);
}
members.Add(pathMember);
if (_observable)
{
var observer = TryObserveMember(source, pathMember, index == lastIndex);
if (observer != null)
{
_listeners.Add(observer);
}
}
if (index == lastIndex)
{
break;
}
source = pathMember.GetValue(source, null);
if (source.IsNullOrUnsetValue())
{
if (Path.IsDebuggable)
{
DebugInfo($"Value is not available for '{pathMember.Path}'", new[] { GetActualSource(false) });
}
return(UnsetBindingPathMembers.Instance);
}
}
return(new MultiBindingPathMembers(_lastMemberListener.Reference, source, members));
}
public ConstResourceObject(object value)
{
_reference = value as WeakReference ?? ToolkitExtensions.GetWeakReference(value);
}
public RootResourceObject([NotNull] object target, [NotNull] IBindingMemberInfo rootMemberInfo)
{
_target = ToolkitExtensions.GetWeakReference(target);
_rootMemberInfo = rootMemberInfo;
rootMemberInfo.TryObserve(target, this);
}
internal WeakListenerInternal(object source, EventInfo eventInfo)
{
_sourceRef = ToolkitExtensions.GetWeakReference(source);
_eventInfo = eventInfo;
}
public WeakPropertyChangedListener(INotifyPropertyChanged propertyChanged)
{
_listeners = MugenMvvmToolkit.Empty.Array <KeyValuePair <WeakEventListenerWrapper, string> >();
_propertyChanged = ToolkitExtensions.GetWeakReference(propertyChanged);
}
public CloseCommandWrapper(ICommand nestedCommand, NavigationProvider provider, IViewModel viewModel)
{
NestedCommand = nestedCommand;
_provider = provider;
_reference = ToolkitExtensions.GetWeakReference(viewModel);
}
private HandlerSubscriber(object target, bool isViewModelHandler)
{
_hashCode = RuntimeHelpers.GetHashCode(target);
_reference = ToolkitExtensions.GetWeakReference(target);
_isViewModelHandler = isViewModelHandler;
}
