54 lines
2.0 KiB
C++
54 lines
2.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
// NoesisGUI - http://www.noesisengine.com
|
|
// Copyright (c) 2013 Noesis Technologies S.L. All Rights Reserved.
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
#ifndef __CORE_IVALUECONVERTER_H__
|
|
#define __CORE_IVALUECONVERTER_H__
|
|
|
|
|
|
#include <NsCore/Noesis.h>
|
|
#include <NsCore/Interface.h>
|
|
|
|
|
|
namespace Noesis
|
|
{
|
|
|
|
template<class T> class Ptr;
|
|
class BaseComponent;
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
/// Provides a way to apply custom logic to a binding.
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
NS_INTERFACE IValueConverter: public Interface
|
|
{
|
|
/// The data binding engine calls this method when it propagates a value from the binding
|
|
/// source to the binding target.
|
|
///
|
|
/// Return *DependencyProperty.UnsetValue* to indicate that the converter produced no value and
|
|
/// that the fallback (if available) or default value should be used instead.
|
|
///
|
|
/// Return *Binding.DoNothing* to indicate that the binding should not transfer the value or use
|
|
/// the fallback or default value.
|
|
virtual bool TryConvert(BaseComponent* value, const Type* targetType, BaseComponent* parameter,
|
|
Ptr<BaseComponent>& result) = 0;
|
|
|
|
/// The data binding engine calls this method when it propagates a value from the binding
|
|
/// target to the binding source.
|
|
///
|
|
/// Return *Binding.DoNothing* to indicate that no value should be set on the source property.
|
|
///
|
|
/// Return *DependencyProperty.UnsetValue* to indicate that the converter is unable to provide
|
|
/// a value for the source property, and no value will be set to it.
|
|
virtual bool TryConvertBack(BaseComponent* value, const Type* targetType,
|
|
BaseComponent* parameter, Ptr<BaseComponent>& result) = 0;
|
|
|
|
NS_IMPLEMENT_INLINE_REFLECTION_(IValueConverter, Interface)
|
|
};
|
|
|
|
}
|
|
|
|
|
|
#endif
|