/// <summary>
/// Update a property from the target (.NET object) to the source (ViewModel). This method is used when in a TwoWay binding, to update the source property.
/// </summary>
/// <typeparam name="T">The type of the source property.</typeparam>
/// <param name="sourceProperty">The source property to update.</param>
/// <param name="viewModel">The ViewModel on which the property will be updated.</param>
/// <param name="value">The new value to set the source property.</param>
/// <param name="valueConverter">The converter to use to convert back the target (.NET object) property to the source (ViewModel) property.</param>
/// <param name="converterParameter">The optional paramater to use in the value converter.</param>
private static void UpdateSourceProperty <T>(PropertyInfo sourceProperty, BindableObject viewModel, T value, IBindingValueConverter valueConverter, string converterParameter)
{
_busyBindings.Add(sourceProperty.Name);
sourceProperty.SetValue(viewModel, valueConverter == null ? value : valueConverter.ConvertBack(value, sourceProperty.PropertyType, converterParameter, CultureInfo.CurrentCulture));
_busyBindings.Remove(sourceProperty.Name);
}
/// <summary>
/// Update a property from the target (.NET object) to the source (ViewModel). This method is used when in a TwoWay binding, to update the source property.
/// </summary>
/// <typeparam name="T">The type of the source property.</typeparam>
/// <param name="sourceProperty">The source property to update.</param>
/// <param name="viewModel">The ViewModel on which the property will be updated.</param>
/// <param name="value">The new value to set the source property.</param>
/// <param name="valueConverter">The converter to use to convert back the target (.NET object) property to the source (ViewModel) property.</param>
/// <param name="converterParameter">The optional paramater to use in the value converter.</param>
private static void UpdateSourceProperty <T>(PropertyInfo sourceProperty, BindableObject viewModel, T value, IBindingValueConverter valueConverter, string converterParameter)
{
_preventUpdateForTargetProperty = true;
sourceProperty.SetValue(viewModel, valueConverter == null ? value : valueConverter.ConvertBack(value, sourceProperty.PropertyType, converterParameter, CultureInfo.CurrentCulture));
_preventUpdateForTargetProperty = false;
}
private object GetTargetValue(IBindingMemberInfo targetMember, IDataContext context, bool throwOnError)
{
var isDebuggable = IsDebuggable;
object value = GetRawValueInternal(targetMember, context, throwOnError);
if (isDebuggable)
{
DebugInfo($"Got a target value: '{value}'");
}
if (value.IsUnsetValueOrDoNothing())
{
return(value);
}
IBindingValueConverter converter = _parameters.ConverterDelegate?.Invoke(context);
if (converter != null)
{
CultureInfo culture = _parameters.ConverterCultureDelegate?.Invoke(context) ?? BindingServiceProvider.BindingCultureInfo();
object parameter = _parameters.ConverterParameterDelegate?.Invoke(context);
if (isDebuggable)
{
DebugInfo($"Applying converter for target value: '{value}', converter: '{converter}', parameter: '{parameter}', culture: {culture}, target type: '{targetMember.Type}'");
value = converter.ConvertBack(value, targetMember.Type, parameter, culture, context);
DebugInfo($"Converter '{converter}' returns value: '{value}'");
}
else
{
value = converter.ConvertBack(value, targetMember.Type, parameter, culture, context);
}
}
if (Equals(value, _parameters.TargetNullValue))
{
if (isDebuggable)
{
DebugInfo("Target value equals to TargetNullValue, return null value");
}
return(null);
}
return(value);
}
private object GetTargetValue(IBindingMemberInfo targetMember, IDataContext context, bool throwOnError)
{
object value = GetRawValueInternal(targetMember, context, throwOnError);
if (value.IsUnsetValueOrDoNothing())
{
return(value);
}
if (_parameters.ConverterDelegate != null)
{
IBindingValueConverter converter = _parameters.ConverterDelegate(context);
if (converter != null)
{
CultureInfo culture = _parameters.ConverterCultureDelegate.GetValueOrDefault(context, BindingServiceProvider.BindingCultureInfo());
object parameter = _parameters.ConverterParameterDelegate.GetValueOrDefault(context);
value = converter.ConvertBack(value, targetMember.Type, parameter, culture, context);
}
}
if (Equals(value, _parameters.TargetNullValue))
{
return(null);
}
return(value);
}
