public void AttachPropertyChangedHandler_Should_Be_Called_On_Chain()
{
var source = new Mock<IObservableDependencyObject>();
var foo = new Mock<IObservableDependencyObject>();
var bar = new Mock<IObservableDependencyObject>();
Mock<IPropertyPathParser> mockPathParser = new Mock<IPropertyPathParser>();
mockPathParser.Setup(x => x.Parse(source.Object, "Foo.Bar")).Returns(new[]
{
new PropertyPathToken(source.Object, "Foo"),
new PropertyPathToken(foo.Object, "Bar"),
new PropertyPathToken(bar.Object, null),
});
Mock<DependencyObject> mockTarget = new Mock<DependencyObject>();
Binding binding = new Binding
{
Path = new PropertyPath("Foo.Bar"),
Source = source.Object,
};
BindingExpression target = new BindingExpression(
mockPathParser.Object,
mockTarget.Object,
Control.BackgroundProperty,
binding);
target.GetValue();
source.Verify(x => x.AttachPropertyChangedHandler("Foo", It.IsAny<DependencyPropertyChangedEventHandler>()));
foo.Verify(x => x.AttachPropertyChangedHandler("Bar", It.IsAny<DependencyPropertyChangedEventHandler>()));
bar.Verify(x => x.AttachPropertyChangedHandler("Bar", It.IsAny<DependencyPropertyChangedEventHandler>()), Times.Never());
}
public async void Getting_Invalid_Double_String_Should_Return_BindingError()
{
var data = new Class1 { StringValue = "foo" };
var target = new BindingExpression(new ExpressionObserver(data, "StringValue"), typeof(double));
var result = await target.Take(1);
Assert.IsType<BindingNotification>(result);
}
public async void Should_Get_Simple_Property_Value()
{
var data = new Class1 { StringValue = "foo" };
var target = new BindingExpression(new ExpressionObserver(data, "StringValue"), typeof(string));
var result = await target.Take(1);
Assert.Equal("foo", result);
}
public async void Should_Coerce_Get_Null_Double_String_To_UnsetValue()
{
var data = new Class1 { StringValue = null };
var target = new BindingExpression(new ExpressionObserver(data, "StringValue"), typeof(double));
var result = await target.Take(1);
Assert.Equal(AvaloniaProperty.UnsetValue, result);
}
public void Should_Set_Simple_Property_Value()
{
var data = new Class1 { StringValue = "foo" };
var target = new BindingExpression(new ExpressionObserver(data, "StringValue"), typeof(string));
target.OnNext("bar");
Assert.Equal("bar", data.StringValue);
}
public async void Should_Convert_Get_String_To_Double()
{
Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;
var data = new Class1 { StringValue = "5.6" };
var target = new BindingExpression(new ExpressionObserver(data, "StringValue"), typeof(double));
var result = await target.Take(1);
Assert.Equal(5.6, result);
}
public void Should_Convert_Set_String_To_Double()
{
Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;
var data = new Class1 { StringValue = (5.6).ToString() };
var target = new BindingExpression(new ExpressionObserver(data, "StringValue"), typeof(double));
target.OnNext(6.7);
Assert.Equal((6.7).ToString(), data.StringValue);
}
public void Should_Handle_DataValidation()
{
var data = new Class1 { DoubleValue = 5.6 };
var converter = new Mock<IValueConverter>();
var target = new BindingExpression(new ExpressionObserver(data, "DoubleValue", true), typeof(string));
var result = new List<object>();
target.Subscribe(x => result.Add(x));
target.OnNext(1.2);
target.OnNext("3.4");
target.OnNext("bar");
Assert.Equal(
new[]
{
new BindingNotification("5.6"),
new BindingNotification("1.2"),
new BindingNotification("3.4"),
new BindingNotification(
new InvalidCastException("'bar' is not a valid number."),
BindingErrorType.Error)
},
result);
}
public void Should_Pass_ConverterParameter_To_ConvertBack()
{
var data = new Class1 { DoubleValue = 5.6 };
var converter = new Mock<IValueConverter>();
var target = new BindingExpression(
new ExpressionObserver(data, "DoubleValue"),
typeof(string),
converter.Object,
converterParameter: "foo");
target.OnNext("bar");
converter.Verify(x => x.ConvertBack("bar", typeof(double), "foo", CultureInfo.CurrentUICulture));
}
public async void Should_Convert_Get_Double_To_String()
{
Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;
var data = new Class1 { DoubleValue = 5.6 };
var target = new BindingExpression(new ExpressionObserver(data, "DoubleValue"), typeof(string));
var result = await target.Take(1);
Assert.Equal((5.6).ToString(), result);
}
public void Setting_Invalid_Double_String_Should_Not_Change_Target()
{
var data = new Class1 { DoubleValue = 5.6 };
var target = new BindingExpression(new ExpressionObserver(data, "DoubleValue"), typeof(string));
target.OnNext("foo");
Assert.Equal(5.6, data.DoubleValue);
}
public async void Should_Return_BindingNotification_For_Invalid_FallbackValue_With_Data_Validation()
{
Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;
var data = new Class1 { StringValue = "foo" };
var target = new BindingExpression(
new ExpressionObserver(data, "StringValue", true),
typeof(int),
"bar",
DefaultValueConverter.Instance);
var result = await target.Take(1);
Assert.Equal(
new BindingNotification(
new AggregateException(
new InvalidCastException("Could not convert 'foo' to 'System.Int32'"),
new InvalidCastException("Could not convert FallbackValue 'bar' to 'System.Int32'")),
BindingErrorType.Error),
result);
}
public async void Should_Return_BindingNotification_With_FallbackValue_For_NonConvertibe_Target_Value_With_Data_Validation()
{
Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;
var data = new Class1 { StringValue = "foo" };
var target = new BindingExpression(
new ExpressionObserver(data, "StringValue", true),
typeof(int),
42,
DefaultValueConverter.Instance);
var result = await target.Take(1);
Assert.Equal(
new BindingNotification(
new InvalidCastException("'foo' is not a valid number."),
BindingErrorType.Error,
42),
result);
}
public BindingExpression SetBinding(DependencyProperty dp, Binding binding)
{
PropertyPathParser pathParser = new PropertyPathParser();
BindingExpression expression = new BindingExpression(pathParser, this, dp, binding);
object oldValue = this.GetValue(dp);
object newValue = expression.GetValue();
this.propertyBindings.Add(dp, expression);
this.SetValueInternal(dp, oldValue, newValue);
return expression;
}
/// <inheritdoc/>
public InstancedBinding Initiate(
IAvaloniaObject target,
AvaloniaProperty targetProperty,
object anchor = null,
bool enableDataValidation = false)
{
Contract.Requires <ArgumentNullException>(target != null);
anchor = anchor ?? DefaultAnchor?.Target;
enableDataValidation = enableDataValidation && Priority == BindingPriority.LocalValue;
ExpressionObserver observer;
var(node, mode) = ExpressionObserverBuilder.Parse(Path, enableDataValidation, TypeResolver);
if (ElementName != null)
{
observer = CreateElementObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
ElementName,
node);
}
else if (Source != null)
{
observer = CreateSourceObserver(Source, node);
}
else if (RelativeSource == null)
{
if (mode == SourceMode.Data)
{
observer = CreateDataContextObserver(
target,
node,
targetProperty == StyledElement.DataContextProperty,
anchor);
}
else
{
observer = new ExpressionObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
node);
}
}
else if (RelativeSource.Mode == RelativeSourceMode.DataContext)
{
observer = CreateDataContextObserver(
target,
node,
targetProperty == StyledElement.DataContextProperty,
anchor);
}
else if (RelativeSource.Mode == RelativeSourceMode.Self)
{
observer = CreateSourceObserver(target, node);
}
else if (RelativeSource.Mode == RelativeSourceMode.TemplatedParent)
{
observer = CreateTemplatedParentObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
node);
}
else if (RelativeSource.Mode == RelativeSourceMode.FindAncestor)
{
if (RelativeSource.Tree == TreeType.Visual && RelativeSource.AncestorType == null)
{
throw new InvalidOperationException("AncestorType must be set for RelativeSourceMode.FindAncestor when searching the visual tree.");
}
observer = CreateFindAncestorObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
RelativeSource,
node);
}
else
{
throw new NotSupportedException();
}
var fallback = FallbackValue;
// If we're binding to DataContext and our fallback is UnsetValue then override
// the fallback value to null, as broken bindings to DataContext must reset the
// DataContext in order to not propagate incorrect DataContexts to child controls.
// See Avalonia.Markup.UnitTests.Data.DataContext_Binding_Should_Produce_Correct_Results.
if (targetProperty == StyledElement.DataContextProperty && fallback == AvaloniaProperty.UnsetValue)
{
fallback = null;
}
var subject = new BindingExpression(
observer,
targetProperty?.PropertyType ?? typeof(object),
fallback,
Converter ?? DefaultValueConverter.Instance,
ConverterParameter,
Priority);
return(new InstancedBinding(subject, Mode, Priority));
}
/// <inheritdoc/>
public InstancedBinding Initiate(
IAvaloniaObject target,
AvaloniaProperty targetProperty,
object anchor = null,
bool enableDataValidation = false)
{
Contract.Requires <ArgumentNullException>(target != null);
anchor = anchor ?? DefaultAnchor?.Target;
enableDataValidation = enableDataValidation && Priority == BindingPriority.LocalValue;
ExpressionObserver observer;
INameScope nameScope = null;
NameScope?.TryGetTarget(out nameScope);
var(node, mode) = ExpressionObserverBuilder.Parse(Path, enableDataValidation, TypeResolver, nameScope);
if (ElementName != null)
{
observer = CreateElementObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
ElementName,
node);
}
else if (Source != null)
{
observer = CreateSourceObserver(Source, node);
}
else if (RelativeSource == null)
{
if (mode == SourceMode.Data)
{
observer = CreateDataContextObserver(
target,
node,
targetProperty == StyledElement.DataContextProperty,
anchor);
}
else
{
observer = new ExpressionObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
node);
}
}
else if (RelativeSource.Mode == RelativeSourceMode.DataContext)
{
observer = CreateDataContextObserver(
target,
node,
targetProperty == StyledElement.DataContextProperty,
anchor);
}
else if (RelativeSource.Mode == RelativeSourceMode.Self)
{
observer = CreateSourceObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
node);
}
else if (RelativeSource.Mode == RelativeSourceMode.TemplatedParent)
{
observer = CreateTemplatedParentObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
node);
}
else if (RelativeSource.Mode == RelativeSourceMode.FindAncestor)
{
if (RelativeSource.Tree == TreeType.Visual && RelativeSource.AncestorType == null)
{
throw new InvalidOperationException("AncestorType must be set for RelativeSourceMode.FindAncestor when searching the visual tree.");
}
observer = CreateFindAncestorObserver(
(target as IStyledElement) ?? (anchor as IStyledElement),
RelativeSource,
node);
}
else
{
throw new NotSupportedException();
}
var fallback = FallbackValue;
// If we're binding to DataContext and our fallback is UnsetValue then override
// the fallback value to null, as broken bindings to DataContext must reset the
// DataContext in order to not propagate incorrect DataContexts to child controls.
// See Avalonia.Markup.UnitTests.Data.DataContext_Binding_Should_Produce_Correct_Results.
if (targetProperty == StyledElement.DataContextProperty && fallback == AvaloniaProperty.UnsetValue)
{
fallback = null;
}
var converter = Converter;
var targetType = targetProperty?.PropertyType ?? typeof(object);
// We only respect `StringFormat` if the type of the property we're assigning to will
// accept a string. Note that this is slightly different to WPF in that WPF only applies
// `StringFormat` for target type `string` (not `object`).
if (!string.IsNullOrWhiteSpace(StringFormat) &&
(targetType == typeof(string) || targetType == typeof(object)))
{
converter = new StringFormatValueConverter(StringFormat, converter);
}
var subject = new BindingExpression(
observer,
targetType,
fallback,
TargetNullValue,
converter ?? DefaultValueConverter.Instance,
ConverterParameter,
Priority);
return(new InstancedBinding(subject, Mode, Priority));
}
public void Setting_Invalid_Double_String_Should_Use_FallbackValue()
{
var data = new Class1 { DoubleValue = 5.6 };
var target = new BindingExpression(
new ExpressionObserver(data, "DoubleValue"),
typeof(string),
"9.8",
DefaultValueConverter.Instance);
target.OnNext("foo");
Assert.Equal(9.8, data.DoubleValue);
}
public void Should_Coerce_Setting_UnsetValue_Double_To_Default_Value()
{
var data = new Class1 { DoubleValue = 5.6 };
var target = new BindingExpression(new ExpressionObserver(data, "DoubleValue"), typeof(string));
target.OnNext(AvaloniaProperty.UnsetValue);
Assert.Equal(0, data.DoubleValue);
}
public void Should_Convert_Set_Double_To_String()
{
Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;
var data = new Class1 { DoubleValue = 5.6 };
var target = new BindingExpression(new ExpressionObserver(data, "DoubleValue"), typeof(string));
target.OnNext("6.7");
Assert.Equal(6.7, data.DoubleValue);
}
/// <inheritdoc/>
public InstancedBinding Initiate(
IAvaloniaObject target,
AvaloniaProperty targetProperty,
object anchor = null,
bool enableDataValidation = false)
{
Contract.Requires<ArgumentNullException>(target != null);
var pathInfo = ParsePath(Path);
ValidateState(pathInfo);
enableDataValidation = enableDataValidation && Priority == BindingPriority.LocalValue;
ExpressionObserver observer;
if (pathInfo.ElementName != null || ElementName != null)
{
observer = CreateElementObserver(
(target as IControl) ?? (anchor as IControl),
pathInfo.ElementName ?? ElementName,
pathInfo.Path);
}
else if (Source != null)
{
observer = CreateSourceObserver(Source, pathInfo.Path, enableDataValidation);
}
else if (RelativeSource == null || RelativeSource.Mode == RelativeSourceMode.DataContext)
{
observer = CreateDataContexObserver(
target,
pathInfo.Path,
targetProperty == Control.DataContextProperty,
anchor,
enableDataValidation);
}
else if (RelativeSource.Mode == RelativeSourceMode.TemplatedParent)
{
observer = CreateTemplatedParentObserver(target, pathInfo.Path);
}
else
{
throw new NotSupportedException();
}
var fallback = FallbackValue;
// If we're binding to DataContext and our fallback is UnsetValue then override
// the fallback value to null, as broken bindings to DataContext must reset the
// DataContext in order to not propagate incorrect DataContexts to child controls.
// See Avalonia.Markup.Xaml.UnitTests.Data.DataContext_Binding_Should_Produce_Correct_Results.
if (targetProperty == Control.DataContextProperty && fallback == AvaloniaProperty.UnsetValue)
{
fallback = null;
}
var subject = new BindingExpression(
observer,
targetProperty?.PropertyType ?? typeof(object),
fallback,
Converter ?? DefaultValueConverter.Instance,
ConverterParameter,
Priority);
return new InstancedBinding(subject, Mode, Priority);
}
