public object GetConverterParameter()
{
object parameter = null;
if (ConverterParameter != null)
{
parameter = ConverterParameter;
}
else
{
if (!string.IsNullOrEmpty(ConverterParameterName))
{
MemberInfo[] parameterMember = null;
if (DataContextSource != null)
{
parameterMember = DataContextSource.GetType().GetMember(ConverterParameterName);
if (parameterMember.Length > 0)
{
parameter = parameterMember[0].GetValue(DataContextSource);
}
else
{
parameterMember = Source.GetType().GetMember(ConverterParameterName);
if (parameterMember.Length > 0)
{
parameter = parameterMember[0].GetValue(Source);
}
}
}
}
}
return(parameter);
}
protected virtual object GetValue()
{
Type targetType = null;
if (Member != null && Source != null)
{
var view = Source as IDataContext <object>;
if (view != null && view.DataContext != null)
{
DataContextSource = view.DataContext;
DataContextMember = DataContextSource.GetType().GetMember(Member.Name).FirstOrDefault();
if (DataContextMember != null)
{
targetType = Member.GetMemberType();
var dataContextValue = DataContextMember.GetValue(DataContextSource);
return(Convert(dataContextValue, Type, ValueConverter));
}
}
var value = Member.GetValue(Source);
return(value);
}
return(ConvertValue(_Value, targetType));
}
public Result.IfSuccess <BindingSource> VisitDataContextSource(DataContextSource dataContextSource, Parameters parameters, Context context)
{
var binding = parameters.Binding;
var elementName = context.XamlElementNameProvider.GetName(binding);
context.BindingPathBuilder.AppendLine(
$@" {context.BindingSource.Name}.BindSourceDataContextOneWay(
{binding.Id},
{TargetCodeGenerator.GetTarget(this.elementType, elementName, parameters.HasCodeBehind)},
{this.targetValue.GetDependencyProperty()},
t => {this.targetValue.GetPropertyGetter()});");
context.ExternAliases.TryAdd(this.elementType);
return(Result.Success(context.BindingSource));
}
void SetDataContextSource(FrameworkElement fe)
{
if (DataContextSource != null)
{
DataContextSource.RemovePropertyChangedHandler(FrameworkElement.DataContextProperty, DataContextChanged);
}
DataContextSource = fe;
if (DataContextSource != null)
{
DataContextSource.AddPropertyChangedHandler(FrameworkElement.DataContextProperty, DataContextChanged);
}
// If a FrameworkElement binds to its own datacontext and the VisualParent is null, we end
// up here with a null DataContextSource. In this scenario we do not want to update.
if (DataContextSource != null || IsMentorDataContextBound)
{
PropertyPathWalker.Update(DataContextSource == null ? null : DataContextSource.DataContext);
}
}
