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 void GetValueShouldReturnActualValueDoubleSource()
{
const string value = "100";
bool isInvoked = false;
var memberMock = new BindingMemberInfoMock();
var sourceModel = new BindingSourceModel();
string propertyName1 = GetMemberPath <BindingSourceModel>(model => model.IntProperty);
string propertyName2 = GetMemberPath <BindingSourceModel>(model => model["test"]);
var valueAccessor = new MultiBindingSourceAccessor(new[]
{
CreateSource(sourceModel, propertyName1),
CreateSource(sourceModel, propertyName2),
},
(context, list) =>
{
list.Count.ShouldEqual(2);
isInvoked = true;
context.ShouldEqual(EmptyContext);
list[0].ShouldEqual(sourceModel.IntProperty);
list[1].ShouldEqual(sourceModel["test"]);
return(value);
}, EmptyContext);
valueAccessor.GetValue(memberMock, EmptyContext, true).ShouldEqual(value);
isInvoked.ShouldBeTrue();
isInvoked = false;
sourceModel["test"] = propertyName1;
sourceModel.IntProperty = int.MaxValue;
valueAccessor.GetValue(memberMock, EmptyContext, true).ShouldEqual(value);
isInvoked.ShouldBeTrue();
}
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 IBindingSource[sourceDelegates.Count];
for (int index = 0; index < sourceDelegates.Count; index++)
{
sources[index] = Decorate(sourceDelegates[index].Invoke(context), false, context);
}
sourceAccessor = new MultiBindingSourceAccessor(sources, formatExpression, context);
}
else
{
sourceAccessor = new BindingSourceAccessor(Decorate(sourceDelegates[0].Invoke(context), false, context), context, false);
}
var binding = new DataBinding(new BindingSourceAccessor(GetBindingTarget(context, out target, out targetPath), context, true), sourceAccessor);
AddBehaviors(binding, context);
return(binding);
}
public void GetValueShouldThrowExceptionInvalidValueIfFlagTrue()
{
var memberMock = new BindingMemberInfoMock();
var sourceModel = new BindingSourceModel();
const string propertyName = "invalid";
var valueAccessor = new MultiBindingSourceAccessor(new[] { CreateSource(sourceModel, propertyName) },
(context, list) => null, EmptyContext);
ShouldThrow(() => valueAccessor.GetValue(memberMock, EmptyContext, true));
}
public void GetEventValueShouldAlwaysReturnBindingMemberValue()
{
var memberMock = new BindingMemberInfoMock {
MemberType = BindingMemberType.Event
};
var source = new BindingSourceModel();
var accessor = new MultiBindingSourceAccessor(new[] { CreateSource(source, BindingSourceModel.EventName) },
(context, list) => memberMock, EmptyContext);
var memberValue = (BindingActionValue)accessor.GetValue(memberMock, EmptyContext, true);
memberValue.GetValue(new object[] { null, null }).ShouldEqual(memberMock);
}
public void GetValueShouldReturnValueUsingTargetNullValueSource()
{
const int targetNullValue = 0;
var memberMock = new BindingMemberInfoMock();
var sourceModel = new BindingSourceModel {
ObjectProperty = null
};
var dataContext = new DataContext
{
{ BindingBuilderConstants.TargetNullValue, targetNullValue },
};
string propertyName = GetMemberPath <BindingSourceModel>(model => model.ObjectProperty);
var valueAccessor = new MultiBindingSourceAccessor(new[] { CreateSource(sourceModel, propertyName) },
(context, list) => list.Single(), dataContext);
valueAccessor.GetValue(memberMock, dataContext, true).ShouldEqual(targetNullValue);
}
public void GetValueShouldReturnValueUsingFallbackValueSource()
{
const int fallback = 0;
var memberMock = new BindingMemberInfoMock();
var sourceModel = new BindingSourceModel {
ObjectProperty = BindingConstants.UnsetValue
};
var dataContext = new DataContext
{
{ BindingBuilderConstants.Fallback, d => fallback },
};
string propertyName = GetMemberPath <BindingSourceModel>(model => model.ObjectProperty);
var valueAccessor = new MultiBindingSourceAccessor(new[] { CreateSource(sourceModel, propertyName) },
(context, list) => list.Single(), dataContext);
valueAccessor.GetValue(memberMock, EmptyContext, true).ShouldEqual(fallback);
}
public void GetValueShouldReturnValueUsingConverterSourceDoubleSource()
{
bool converterInvoked = false;
var memberMock = new BindingMemberInfoMock
{
Type = typeof(int)
};
CultureInfo culture = CultureInfo.InvariantCulture;
var parameter = new object();
var sourceModel = new BindingSourceModel();
var converterMock = new ValueConverterCoreMock
{
Convert = (o, type, arg3, arg4) =>
{
converterInvoked = true;
o.ShouldEqual(sourceModel.IntProperty.ToString() + sourceModel.ObjectProperty);
type.ShouldEqual(typeof(int));
arg3.ShouldEqual(parameter);
arg4.ShouldEqual(culture);
return(int.MaxValue);
}
};
var dataContext = new DataContext
{
{ BindingBuilderConstants.Converter, d => converterMock },
{ BindingBuilderConstants.ConverterCulture, d => culture },
{ BindingBuilderConstants.ConverterParameter, d => parameter }
};
string propertyName = GetMemberPath <BindingSourceModel>(model => model.IntProperty);
var valueAccessor = new MultiBindingSourceAccessor(new[]
{
CreateSource(sourceModel, propertyName),
CreateSource(sourceModel, GetMemberPath(sourceModel, model => model.ObjectProperty)),
},
(context, list) => list[0].ToString() + list[1], dataContext);
valueAccessor.GetValue(memberMock, EmptyContext, true).ShouldEqual(int.MaxValue);
converterInvoked.ShouldBeTrue();
}
public void GetValueShouldReturnActualValue()
{
bool isInvoked = false;
var memberMock = new BindingMemberInfoMock();
var sourceModel = new BindingSourceModel();
string propertyName = GetMemberPath <BindingSourceModel>(model => model.IntProperty);
var valueAccessor = new MultiBindingSourceAccessor(new[] { CreateSource(sourceModel, propertyName) },
(context, list) =>
{
isInvoked = true;
context.ShouldEqual(EmptyContext);
list.Single().ShouldEqual(sourceModel.IntProperty);
return(sourceModel.IntProperty);
}, EmptyContext);
valueAccessor.GetValue(memberMock, EmptyContext, true).ShouldEqual(sourceModel.IntProperty);
isInvoked.ShouldBeTrue();
isInvoked = false;
sourceModel.IntProperty = int.MaxValue;
valueAccessor.GetValue(memberMock, EmptyContext, true).ShouldEqual(sourceModel.IntProperty);
isInvoked.ShouldBeTrue();
}
