public InstancedBinding Initiate(
IAvaloniaObject target,
AvaloniaProperty targetProperty,
object anchor = null,
bool enableDataValidation = false)
{
var mode = Mode == BindingMode.Default ?
targetProperty.GetMetadata(target.GetType()).DefaultBindingMode :
Mode;
switch (mode)
{
case BindingMode.OneTime:
return(InstancedBinding.OneTime(Source.GetObservable(Property)));
case BindingMode.OneWay:
return(InstancedBinding.OneWay(Source.GetObservable(Property)));
case BindingMode.OneWayToSource:
return(InstancedBinding.OneWayToSource(Source.GetSubject(Property)));
case BindingMode.TwoWay:
return(InstancedBinding.TwoWay(Source.GetSubject(Property)));
default:
throw new NotSupportedException("Unsupported BindingMode.");
}
}
/// <inheritdoc/>
public InstancedBinding Initiate(
IAvaloniaObject target,
AvaloniaProperty targetProperty,
object anchor = null,
bool enableDataValidation = false)
{
if (Converter == null)
{
throw new NotSupportedException("MultiBinding without Converter not currently supported.");
}
var targetType = targetProperty?.PropertyType ?? typeof(object);
var children = Bindings.Select(x => x.Initiate(target, null));
var input = children.Select(x => x.Subject).CombineLatest().Select(x => ConvertValue(x, targetType));
var mode = Mode == BindingMode.Default ?
targetProperty.GetMetadata(target.GetType()).DefaultBindingMode : Mode;
switch (mode)
{
case BindingMode.OneTime:
return(InstancedBinding.OneTime(input, Priority));
case BindingMode.OneWay:
return(InstancedBinding.OneWay(input, Priority));
default:
throw new NotSupportedException(
"MultiBinding currently only supports OneTime and OneWay BindingMode.");
}
}
/// <inheritdoc/>
public InstancedBinding?Initiate(
IAvaloniaObject target,
AvaloniaProperty?targetProperty,
object?anchor = null,
bool enableDataValidation = false)
{
var targetType = targetProperty?.PropertyType ?? typeof(object);
var converter = Converter;
// 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 StringFormatMultiValueConverter(StringFormat !, converter);
}
var children = Bindings.Select(x => x.Initiate(target, null));
var input = children.Select(x => x?.Observable !)
.Where(x => x is not null)
.CombineLatest()
.Select(x => ConvertValue(x, targetType, converter))
.Where(x => x != BindingOperations.DoNothing);
var mode = Mode == BindingMode.Default ?
targetProperty?.GetMetadata(target.GetType()).DefaultBindingMode : Mode;
switch (mode)
{
case BindingMode.OneTime:
return(InstancedBinding.OneTime(input, Priority));
case BindingMode.OneWay:
return(InstancedBinding.OneWay(input, Priority));
default:
throw new NotSupportedException(
"MultiBinding currently only supports OneTime and OneWay BindingMode.");
}
}