public void SetItems_ListChangedIsRaisedAfterBehaviors()
{
var actionLog = new StringBuilder();
var changeListener = new TestChangeListener();
var ownerProperty = PropertyStub
.WithBehaviors(changeListener)
.Build();
var ownerVM = ViewModelStub
.WithProperties(ownerProperty)
.Build();
var collection = new VMCollection <IViewModel>(ownerVM, ownerProperty);
changeListener.HandleChange += delegate {
actionLog.Append("ChangeHandlerBehavior ");
};
collection.ListChanged += delegate {
actionLog.Append("ListChanged ");
};
IVMCollection <IViewModel> c = collection;
c.ReplaceItems(new[] { ViewModelStub.Build(), ViewModelStub.Build() }, null);
Assert.AreEqual("ChangeHandlerBehavior ListChanged ", actionLog.ToString());
}
public static IVMDescriptor GetItemDescriptor(this IVMCollection collection)
{
return(collection
.OwnerProperty
.Behaviors
.GetItemDescriptor());
}
public override PathMatch Matches(PathDefinitionIterator definitionSteps, PathIterator step)
{
if (!step.HasStep || !step.IsCollection)
{
return(PathMatch.Fail());
}
IVMCollection parentCollection = step.Collection;
step.MoveNext();
if (!step.HasStep || !step.IsProperty)
{
return(PathMatch.Fail());
}
if (!(parentCollection.GetItemDescriptor() is TDescriptor))
{
return(PathMatch.Fail());
}
var itemDescriptor = parentCollection.GetItemDescriptor();
var expectedProperty = _propertySelector.GetProperty(itemDescriptor);
if (expectedProperty == step.Property)
{
PathMatch result = PathMatch.Succeed(length: 1);
PathMatch nextResult = definitionSteps.MatchesNext(step);
return(PathMatch.Combine(result, nextResult));
}
return(PathMatch.Fail());
}
private void ExpectCollectionPropertyValidationOf(IVMCollection <ItemVM> collection)
{
IViewModel owner;
string key;
if (collection == OwnerOfAB.CollectionA)
{
owner = OwnerOfAB;
key = CollectionAValidatorKey;
}
else if (collection == OwnerOfAB.CollectionB)
{
owner = OwnerOfAB;
key = CollectionBValidatorKey;
}
else if (collection == OwnerOfC.CollectionC)
{
owner = OwnerOfC;
key = CollectionCValidatorKey;
}
else
{
throw new InternalTestFailureException();
}
Results.ExpectInvocationOf.CollectionPropertyValidation
.Targeting(collection, x => x.ItemProperty)
.On(owner, key);
}
public IValidatorInvocationBuilder Targeting <TDescriptor>(
IVMCollectionExpression <IViewModel <TDescriptor> > target,
Func <TDescriptor, IVMPropertyDescriptor> targetPropertySelector
) where TDescriptor : IVMDescriptor
{
_targetCollection = (IVMCollection)target;
_targetProperty = targetPropertySelector((TDescriptor)_targetCollection.GetItemDescriptor());
return(this);
}
public void Matches_WithNonMatchingCollectionPlusProperty_Fails()
{
IVMCollection <EmployeeVM> nonMatching = VM.GetValue(x => x.Managers);
AssertNoMatch(
CreateStep((ProjectVMDescriptor x) => x.Name),
Path.Empty.Prepend(ProjectVM.ClassDescriptor.Name).Prepend(nonMatching)
);
}
private void Repopulate(IBehaviorContext context, IVMCollection <TItemVM> collection, IChangeReason reason)
{
var sourceItems = GetSourceItems(context);
IEnumerable <TItemVM> newItems = sourceItems
.Select(s => CreateAndInitializeItem(context, s));
collection.ReplaceItems(newItems, reason);
}
private void Repopulate(IBehaviorContext context, IVMCollection <TItemVM> collection, IChangeReason reason)
{
var sourceItems = this.GetValueNext <IEnumerable <TItemSource> >(context);
var items = sourceItems
.Select(sourceItem => GetItemVM(context, sourceItem));
collection.ReplaceItems(items, reason);
}
public CollectionValidationArgs(
IValidator validator,
TOwnerVM owner,
IVMCollection <TItemVM> items
)
: base(ValidationStep.ViewModel, validator, owner)
{
Check.NotNull(items, nameof(items));
Items = items;
}
public void Matches_WithMatchingCollectionPlusProperty_Fails()
{
// Use CollectionPropertyStep for this scenario (only relevant for validation target).
IVMCollection <ProjectVM> collection = VM.GetValue(x => x.Projects);
AssertNoMatch(
CreateStep((ProjectVMDescriptor x) => x.Name),
Path.Empty.Prepend(ProjectVM.ClassDescriptor.Name).Prepend(collection)
);
}
public void Refresh(IBehaviorContext context, RefreshOptions options)
{
// Call next behavior first, because a source accessor behavior may handle
// it.
this.RefreshNext(context, options);
_collectionSourceCache.Clear(context);
// ToArray so that (1) source is only enumerated once and (2) acess by index
// (required by the equality check) is guaranteed to be fast.
TItemSource[] newSourceItems = GetSourceItems(context).ToArray();
IVMCollection <TItemVM> vmCollection = GetValue(context);
IEnumerable <TItemVM> itemsToRefresh = Enumerable.Empty <TItemVM>();
if (AreCollectionContentsEqual(vmCollection, newSourceItems))
{
itemsToRefresh = vmCollection;
}
else
{
Dictionary <TItemSource, TItemVM> previousItemsBySource = vmCollection.ToDictionary(
x => x.Source,
_reusabilitySourceComparer
);
List <TItemVM> newItems = new List <TItemVM>();
List <TItemVM> reusedItems = new List <TItemVM>();
foreach (TItemSource s in newSourceItems)
{
TItemVM item;
bool isReusedItem = previousItemsBySource.TryGetValue(s, out item);
if (isReusedItem)
{
reusedItems.Add(item);
}
else
{
item = CreateAndInitializeItem(context, s);
}
newItems.Add(item);
}
vmCollection.ReplaceItems(newItems, RefreshReason.Create(options.ExecuteRefreshDependencies));
itemsToRefresh = reusedItems;
}
if (options.Scope.HasFlag(RefreshScope.Content))
{
itemsToRefresh
.ForEach(x => x.Kernel.RefreshWithoutValidation(options.ExecuteRefreshDependencies));
}
}
public void Refresh(IBehaviorContext context, RefreshOptions options)
{
this.RefreshNext(context, options);
IVMCollection <TItemVM> selectedItems = this.GetValueNext <IVMCollection <TItemVM> >(context);
foreach (TItemVM item in selectedItems)
{
item.Kernel.Refresh();
}
}
public static ICollectionValidationTarget ForCollection(
ValidationStep step,
IVMCollection collection,
IVMPropertyDescriptor property = null
)
{
Check.NotNull(collection, nameof(collection));
return(new ValidationTarget(step)
{
Collection = collection, Property = property
});
}
internal static PathHelperResult Succeeded(
IViewModel vm = null,
IVMPropertyDescriptor property = null,
IVMCollection collection = null
)
{
return(new PathHelperResult {
Success = true,
VM = vm,
Property = property,
Collection = collection
});
}
public static CollectionChangedArgs <TItemVM> CollectionCleared(
IVMCollection <TItemVM> collection,
TItemVM[] oldItems
)
{
Check.NotNull(collection, nameof(collection));
Check.NotNull(oldItems, nameof(oldItems));
return(new CollectionChangedArgs <TItemVM>(
CollectionChangeType.ItemsCleared,
collection,
oldItems: oldItems
));
}
private CollectionChangedArgs(
CollectionChangeType type,
IVMCollection <TItemVM> collection,
IEnumerable <TItemVM> oldItems = null,
IEnumerable <TItemVM> newItems = null,
IChangeReason reason = null
)
{
Type = type;
Collection = collection;
Index = -1;
OldItems = oldItems ?? Enumerable.Empty <TItemVM>();
NewItems = newItems ?? Enumerable.Empty <TItemVM>();
Reason = reason;
}
public static IValidationErrorTarget ForError(
ValidationStep step,
IViewModel vm,
IVMCollection collection = null,
IVMPropertyDescriptor property = null
)
{
Check.NotNull(vm, nameof(vm));
return(new ValidationTarget(step)
{
VM = vm,
Collection = collection,
Property = property
});
}
/// <inheritdoc />
public void SetDisplayValue(IBehaviorContext vm, object value)
{
Check.NotNull(vm, nameof(vm));
IEnumerable <TItemVM> sourceCollection = null;
if (value != null)
{
IEnumerable untypedSourceCollection = (IEnumerable)value;
sourceCollection = untypedSourceCollection.Cast <TItemVM>();
}
IVMCollection <TItemVM> targetCollection = GetTargetCollection(vm);
SynchronizeCollections(sourceCollection, targetCollection);
}
private CollectionChangedArgs(
CollectionChangeType type,
IVMCollection <TItemVM> collection,
int index,
TItemVM oldItem = default(TItemVM),
TItemVM newItem = default(TItemVM)
)
{
Type = type;
Collection = collection;
Index = index;
OldItem = oldItem;
OldItems = oldItem != null ? new[] { oldItem } : Enumerable.Empty <TItemVM>();
NewItem = newItem;
NewItems = newItem != null ? new[] { newItem } : Enumerable.Empty <TItemVM>();
}
public ValidatorInvocation(
ValidatorType type,
IViewModel owner,
IViewModel targetVM,
IVMCollection targetCollection,
IVMPropertyDescriptor targetProperty,
object validatorKey = null
)
{
Type = type;
Owner = owner;
TargetVM = targetVM;
TargetProperty = targetProperty;
TargetCollection = targetCollection;
ValidatorKey = validatorKey;
}
public static CollectionChangedArgs <TItemVM> ItemInserted(
IVMCollection <TItemVM> collection,
TItemVM newItem,
int index
)
{
Check.NotNull(collection, nameof(collection));
Check.NotNull(newItem, nameof(newItem));
Check.Requires(0 <= index && index < collection.Count);
return(new CollectionChangedArgs <TItemVM>(
CollectionChangeType.ItemAdded,
collection,
index,
newItem: newItem
));
}
public static CollectionChangedArgs <TItemVM> CollectionPopulated(
IVMCollection <TItemVM> collection,
TItemVM[] oldItems,
IChangeReason reason = null
)
{
Check.NotNull(collection, nameof(collection));
Check.NotNull(oldItems, nameof(oldItems));
return(new CollectionChangedArgs <TItemVM>(
CollectionChangeType.Populated,
collection,
oldItems: oldItems,
newItems: collection,
reason: reason
));
}
public static CollectionChangedArgs <TItemVM> ItemRemoved(
IVMCollection <TItemVM> collection,
TItemVM oldItem,
int index
)
{
Check.NotNull(collection, nameof(collection));
Check.NotNull(oldItem, nameof(oldItem));
Check.Requires(0 <= index && index <= collection.Count);
return(new CollectionChangedArgs <TItemVM>(
CollectionChangeType.ItemRemoved,
collection,
index,
oldItem: oldItem
));
}
public void ReplaceItems_CallsHandleChangeWithCollectionPopulatedArgs()
{
var oldItems = new[] { CreateItem(), CreateItem() };
var newItems = new[] { CreateItem() };
Collection.Add(oldItems[0]);
Collection.Add(oldItems[1]);
ResetStub();
IVMCollection <IViewModel> c = Collection;
c.ReplaceItems(newItems, null);
AssertChangeArgs(
CollectionChangedArgs <IViewModel> .CollectionPopulated(Collection, oldItems)
);
}
internal static ChangeArgs ItemsAdded(
IVMCollection collection,
IEnumerable <IViewModel> newItems,
IChangeReason reason = null
)
{
Check.NotNull(collection, nameof(collection));
Check.NotNull(newItems, nameof(newItems));
Check.NotEmpty(newItems, nameof(newItems));
return(new ChangeArgs(
ChangeType.AddedToCollection,
ValueStage.ValidatedValue,
Path.Empty.Append(collection),
newItems: newItems,
reason: reason
));
}
internal static ChangeArgs ItemsRemoved(
IVMCollection collection,
IEnumerable <IViewModel> oldItems,
IChangeReason reason = null
)
{
Check.NotNull(collection, nameof(collection));
Check.NotNull(oldItems, nameof(oldItems));
Check.NotEmpty(oldItems, nameof(oldItems));
return(new ChangeArgs(
ChangeType.RemovedFromCollection,
ValueStage.ValidatedValue,
Path.Empty.Append(collection),
oldItems: oldItems,
reason: reason
));
}
private bool Matches(IVMCollection collection, PathIterator nextStep)
{
bool canMatchAgainstItemDescriptor = nextStep.IsProperty;
if (!canMatchAgainstItemDescriptor)
{
return(false);
}
if (!(collection.GetItemDescriptor() is TDescriptor))
{
return(false);
}
TDescriptor itemDescriptor = (TDescriptor)collection.GetItemDescriptor();
return(_propertySelector.GetProperty(itemDescriptor) == nextStep.Property);
}
internal static ChangeArgs CollectionPopulated(
IVMCollection collection,
IEnumerable <IViewModel> oldItems,
IChangeReason reason = null
)
{
Check.NotNull(collection, nameof(collection));
var newItems = (IEnumerable <IViewModel>)collection;
return(new ChangeArgs(
ChangeType.CollectionPopulated,
ValueStage.ValidatedValue,
Path.Empty.Append(collection),
newItems: newItems,
oldItems: oldItems,
reason: reason
));
}
private bool AreCollectionContentsEqual(
IVMCollection <TItemVM> vmCollection,
TItemSource[] sourceCollection
)
{
if (sourceCollection.Length != vmCollection.Count)
{
return(false);
}
for (int i = 0; i < sourceCollection.Length; i++)
{
if (!_reusabilitySourceComparer.Equals(sourceCollection[i], vmCollection[i].Source))
{
return(false);
}
}
return(true);
}
private static bool CollectionIsFollowedByItemViewModel(PathIterator step)
{
if (!step.IsCollection)
{
return(false);
}
IVMCollection collection = step.Collection;
step.MoveNext();
if (!step.HasStep || !step.IsViewModel)
{
return(false);
}
IViewModel potentialItem = step.ViewModel;
return(potentialItem.Kernel.OwnerCollections.Any(x => x.Equals(collection)));
}
