public void Should_Track_NonIntegerIndexer()
{
var data = new { Foo = new NonIntegerIndexer() };
data.Foo["foo"] = "bar";
data.Foo["baz"] = "qux";
var target = ExpressionObserverBuilder.Build(data, "Foo[foo]");
var result = new List <object>();
using (var sub = target.Subscribe(x => result.Add(x)))
{
data.Foo["foo"] = "bar2";
}
// Forces WeakEvent compact
Dispatcher.UIThread.RunJobs();
var expected = new[] { "bar", "bar2" };
Assert.Equal(expected, result);
Assert.Equal(0, data.Foo.PropertyChangedSubscriptionCount);
GC.KeepAlive(data);
}
public void Should_Update_Value_After_Root_Changes_With_ComplexPath()
{
var root = new { DataContext = new { Foo = new { Value = "Foo" } } };
var subject = new Subject <object>();
var obs = ExpressionObserverBuilder.Build(subject, "DataContext.Foo.Value");
var values = new List <object>();
obs.Subscribe(v => values.Add(v));
subject.OnNext(root);
subject.OnNext(null);
subject.OnNext(root);
Assert.Equal("Foo", values[0]);
Assert.IsType <BindingNotification>(values[1]);
var bn = values[1] as BindingNotification;
Assert.Equal(AvaloniaProperty.UnsetValue, bn.Value);
Assert.Equal(BindingErrorType.Error, bn.ErrorType);
Assert.Equal(3, values.Count);
Assert.Equal("Foo", values[2]);
}
public void Should_Have_Null_ResultType_For_Broken_Chain()
{
var data = new { Foo = new { Bar = 1 } };
var target = ExpressionObserverBuilder.Build(data, "Foo.Bar.Baz");
Assert.Null(target.ResultType);
GC.KeepAlive(data);
}
private ExpressionObserver CreateSourceObserver(
object source,
string path,
bool enableDataValidation)
{
Contract.Requires <ArgumentNullException>(source != null);
return(ExpressionObserverBuilder.Build(source, path, enableDataValidation, typeResolver: TypeResolver));
}
public async Task Should_Get_UnsetValue_For_Object_Without_Indexer()
{
var data = new { Foo = 5 };
var target = ExpressionObserverBuilder.Build(data, "Foo[noindexer]");
var result = await target.Take(1);
Assert.Equal(AvaloniaProperty.UnsetValue, result);
GC.KeepAlive(data);
}
public async Task Should_Negate_True_String()
{
var data = new { Foo = "True" };
var target = ExpressionObserverBuilder.Build(data, "!Foo");
var result = await target.Take(1);
Assert.False((bool)result);
GC.KeepAlive(data);
}
public async Task Should_Get_UnsetValue_For_Invalid_Array_Index()
{
var data = new { Foo = new[] { "foo", "bar" } };
var target = ExpressionObserverBuilder.Build(data, "Foo[invalid]");
var result = await target.Take(1);
Assert.Equal(AvaloniaProperty.UnsetValue, result);
GC.KeepAlive(data);
}
public async Task Should_Get_Attached_Property_Value()
{
var data = new Class1();
var target = ExpressionObserverBuilder.Build(data, "(Owner.Foo)", typeResolver: _typeResolver);
var result = await target.Take(1);
Assert.Equal("foo", result);
Assert.Null(((IAvaloniaObjectDebug)data).GetPropertyChangedSubscribers());
}
public InstancedBinding ItemsSelector(object item)
{
if (ItemsSource != null)
{
var obs = ExpressionObserverBuilder.Build(item, ItemsSource.Path);
return(InstancedBinding.OneWay(obs, BindingPriority.Style));
}
return(null);
}
public async Task Should_Get_Array_Value()
{
var data = new { Foo = new[] { "foo", "bar" } };
var target = ExpressionObserverBuilder.Build(data, "Foo[1]");
var result = await target.Take(1);
Assert.Equal("bar", result);
GC.KeepAlive(data);
}
public async Task Indexer_Only_Binding_Works()
{
var data = new[] { 1, 2, 3 };
var target = ExpressionObserverBuilder.Build(data, "[1]");
var value = await target.Take(1);
Assert.Equal(data[1], value);
}
public async Task Array_With_Wrong_Dimensions_Should_Return_UnsetValue()
{
var data = new { Foo = new[] { "foo", "bar" } };
var target = ExpressionObserverBuilder.Build(data, "Foo[1,2]");
var result = await target.Take(1);
Assert.Equal(AvaloniaProperty.UnsetValue, result);
GC.KeepAlive(data);
}
public async Task Should_Get_AvaloniaProperty_By_Name()
{
var data = new Class1();
var target = ExpressionObserverBuilder.Build(data, "Foo");
var result = await target.Take(1);
Assert.Equal("foo", result);
Assert.Null(((IAvaloniaObjectDebug)data).GetPropertyChangedSubscribers());
}
public async Task Should_Get_Method_WithCorrectDelegateType(string methodName, Type expectedType)
{
var data = new TestObject();
var observer = ExpressionObserverBuilder.Build(data, methodName);
var result = await observer.Take(1);
Assert.IsType(expectedType, result);
GC.KeepAlive(data);
}
public async Task Should_Get_Method()
{
var data = new TestObject();
var observer = ExpressionObserverBuilder.Build(data, nameof(TestObject.MethodWithoutReturn));
var result = await observer.Take(1);
Assert.NotNull(result);
GC.KeepAlive(data);
}
public async Task Should_Negate_BindingNotification_Value()
{
var data = new { Foo = true };
var target = ExpressionObserverBuilder.Build(data, "!Foo", enableDataValidation: true);
var result = await target.Take(1);
Assert.Equal(new BindingNotification(false), result);
GC.KeepAlive(data);
}
public void SetValue_Should_Return_False_For_Invalid_Value()
{
var data = new { Foo = "foo" };
var target = ExpressionObserverBuilder.Build(data, "!Foo");
target.Subscribe(_ => { });
Assert.False(target.SetValue("bar"));
GC.KeepAlive(data);
}
public async Task Should_Get_Value_For_Non_String_Indexer()
{
var data = new { Foo = new Dictionary <double, string> {
{ 1.0, "bar" }, { 2.0, "qux" }
} };
var target = ExpressionObserverBuilder.Build(data, "Foo[1.0]");
var result = await target.Take(1);
Assert.Equal("bar", result);
GC.KeepAlive(data);
}
public async Task Can_Call_Method_Returned_From_Observer()
{
var data = new TestObject();
var observer = ExpressionObserverBuilder.Build(data, nameof(TestObject.MethodWithReturnAndParameters));
var result = await observer.Take(1);
var callback = (Func <int, int>)result;
Assert.Equal(1, callback(1));
GC.KeepAlive(data);
}
public async Task List_Out_Of_Bounds_Should_Return_UnsetValue()
{
var data = new { Foo = new List <string> {
"foo", "bar"
} };
var target = ExpressionObserverBuilder.Build(data, "Foo[2]");
var result = await target.Take(1);
Assert.Equal(AvaloniaProperty.UnsetValue, result);
GC.KeepAlive(data);
}
public async Task Should_Get_Attached_Property_Value_With_Namespace()
{
var data = new Class1();
var target = ExpressionObserverBuilder.Build(
data,
"(NS:Owner.Foo)",
typeResolver: (ns, name) => ns == "NS" && name == "Owner" ? typeof(Owner) : null);
var result = await target.Take(1);
Assert.Equal("foo", result);
Assert.Null(((IAvaloniaObjectDebug)data).GetPropertyChangedSubscribers());
}
public async Task Should_Get_MultiDimensional_Array_Value()
{
var data = new { Foo = new[, ] {
{ "foo", "bar" }, { "baz", "qux" }
} };
var target = ExpressionObserverBuilder.Build(data, "Foo[1, 1]");
var result = await target.Take(1);
Assert.Equal("qux", result);
GC.KeepAlive(data);
}
public async Task Should_Return_Error_Notification_If_Too_Many_Parameters(string methodName)
{
var data = new TestObject();
var observer = ExpressionObserverBuilder.Build(data, methodName);
var result = await observer.Take(1);
Assert.IsType <BindingNotification>(result);
Assert.Equal(BindingErrorType.Error, ((BindingNotification)result).ErrorType);
GC.KeepAlive(data);
}
public object Select(object o)
{
if (string.IsNullOrEmpty(MemberName))
{
return(o);
}
var expression = ExpressionObserverBuilder.Build(o, MemberName);
object result = AvaloniaProperty.UnsetValue;
expression.Subscribe(x => result = x);
return((result == AvaloniaProperty.UnsetValue || result is BindingNotification) ? null : result);
}
public async Task Should_Pass_Through_BindingNotification_Error()
{
var data = new { };
var target = ExpressionObserverBuilder.Build(data, "!Foo", enableDataValidation: true);
var result = await target.Take(1);
Assert.Equal(
new BindingNotification(
new MissingMemberException("Could not find a matching property accessor for 'Foo' on '{ }'"),
BindingErrorType.Error),
result);
GC.KeepAlive(data);
}
public void Should_SetArrayIndex()
{
var data = new { Foo = new[] { "foo", "bar" } };
var target = ExpressionObserverBuilder.Build(data, "Foo[1]");
using (target.Subscribe(_ => { }))
{
Assert.True(target.SetValue("baz"));
}
Assert.Equal("baz", data.Foo[1]);
GC.KeepAlive(data);
}
public async Task Should_Return_BindingNotification_For_Value_Not_Convertible_To_Boolean()
{
var data = new { Foo = new object() };
var target = ExpressionObserverBuilder.Build(data, "!Foo");
var result = await target.Take(1);
Assert.Equal(
new BindingNotification(
new InvalidCastException($"Unable to convert 'System.Object' to bool."),
BindingErrorType.Error),
result);
GC.KeepAlive(data);
}
public async Task Should_Return_BindingNotification_Error_For_Broken_Chain()
{
var data = new { Foo = new { Bar = 1 } };
var target = ExpressionObserverBuilder.Build(data, "Foo.Bar.Baz");
var result = await target.Take(1);
Assert.IsType <BindingNotification>(result);
Assert.Equal(
new BindingNotification(
new MissingMemberException("Could not find a matching property accessor for 'Baz' on '1'"), BindingErrorType.Error),
result);
GC.KeepAlive(data);
}
public InstancedBinding ItemsSelector(object item)
{
if (ItemsSource != null)
{
var obs = ItemsSource switch
{
Binding reflection => ExpressionObserverBuilder.Build(item, reflection.Path),
CompiledBindingExtension compiled => new ExpressionObserver(item, compiled.Path.BuildExpression(false)),
_ => throw new InvalidOperationException("TreeDataTemplate currently only supports Binding and CompiledBindingExtension!")
};
return(InstancedBinding.OneWay(obs, BindingPriority.Style));
}
return(null);
}
public void Should_Track_Simple_Attached_Value()
{
var data = new Class1();
var target = ExpressionObserverBuilder.Build(data, "(Owner.Foo)", typeResolver: _typeResolver);
var result = new List <object>();
var sub = target.Subscribe(x => result.Add(x));
data.SetValue(Owner.FooProperty, "bar");
Assert.Equal(new[] { "foo", "bar" }, result);
sub.Dispose();
Assert.Null(((IAvaloniaObjectDebug)data).GetPropertyChangedSubscribers());
}